deer-flow/CHANGELOG.md

Changelog

All notable changes to DeerFlow are documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

Unreleased

This section accumulates work toward the 2.2.0 milestone (2.2.0). This release closes that milestone with 301 merged pull requests.

Added

Scheduler

• scheduler: Scheduled tasks can be searched by title or prompt. Finding a task previously meant scanning every title or opening details to read its prompt. A search field above the existing filters matches a literal, trimmed, case-insensitive substring of either field (including Chinese), composes with the status/type filters and thread scope, and clearing it retains the other filters; when nothing matches, task actions hide with localized feedback. Runs entirely on the existing authorized list response — no API change. (#5355)

Agents & runtime

• uploads: Add stable cursor pagination to the list_uploaded_files discovery tool. With more than 100 historical uploads matching the same filters the tool could only return the first page, giving an agent no continuation path. An optional cursor input and next_cursor output now paginate past the default page of 20 (maximum 100), sorted by nanosecond modification time descending with a deterministic raw-filename tie-breaker. The token binds to the runtime-resolved user/thread, normalized filters, current-run exclusions, and ordinary-file metadata; malformed or invalidated continuation returns controlled restart instructions telling the client to discard previously collected pages. total_count still covers all filtered matches and no new dependency, storage layer, or HTTP endpoint is involved. (#5570)

• agents: Middleware-declared tools are now covered by Layer-1 tool authorization on every assembly path (lead agent, native subagents, and the embedded client). LangChain merges each middleware's tools into the bound tool set after the host's explicit-list filter, so declarations such as an extension-contributed tool or plan mode's write_todos previously bypassed the tools policy entirely. Each build now collects declarations from the assembled stack, decides only the names the ordinary pass never saw — seeded with that pass's verdicts so a name denied for the build (including by a fail-closed provider failure) stays denied — and narrows the stack on independent state-preserving copies without mutating caller-owned middleware instances. Behavior change: with authorization.enabled and an explicit tools policy that does not allow write_todos, plan-mode builds no longer bind write_todos, and TodoMiddleware correspondingly stops injecting the todo system prompt and incomplete-todo completion reminders; the built-in RBAC default (missing tool policy = unrestricted) is unchanged, as is every deployment with authorization disabled. Layer 2 also forwards host-resolved tool provenance into AuthzRequest.context["tool_provenance"] and binds the infrastructure exemption (the generated tool_search helper) to the concrete host-created tool object instead of its name, so a same-named foreign tool can no longer inherit the exemption.

• agents: Custom agents can persist a default knowledge scope in agent settings, so a specialized agent starts each conversation with its own corpus instead of all operator-approved knowledge bases. When a new turn omits an explicit selection — including callers without the composer selector — gateway admission applies the saved default; an explicit per-message selection still wins, selecting all knowledge bases clears the binding, and regenerate/resume retain the source turn's accepted scope. This is a default, not an access-control policy: operator allowlists and dataset availability are still enforced. (#5579)

• config: Operators can now overlay core system prompts without source patches. lead_prompt_overlay.prepend/append wraps the assembled lead prompt, subagents.agents.<name>.prompt_overlay extends built-in and configured subagent prompts without mutating the shared registry, and DeerMem's memory.backend_config.prompt_prepend/prompt_append extends the rendered memory-update system message. Empty overlays preserve prompt bytes and overlay text is literal, so stock behavior is unchanged until an operator opts in. (#5794)

• agents: Tool-produced file paths, URLs, and task ids become short, stable artifact handles (art_xxxxxxxx) that survive context compaction, so the model no longer loses or fabricates exact references after earlier tool messages are summarized. Each thread keeps a bounded registry in ThreadState.tool_artifacts projected into the model's hidden durable-context block, and a handle passed in any tool argument — bare, backticked, or nested in dict/list args — is resolved back to the real reference just before the tool executes; unknown or expired handles fail the call without running the tool. A new tool_artifacts config section (enabled, max_entries default 100, detect_refs_in_text, inject_model_context, resolve_handles_in_args) switches each piece, all on by default. Handles are agent-local: task arguments resolve parent handles to concrete references, and delegated reports must return concrete ones. Tool-call steps in the chat timeline show a badge per captured artifact, and SSE values snapshots gain an additive tool_artifacts key. (#4929)

• context: history_search accepts an optional role (user, assistant, or tool). The search returns at most eight matches across all roles, so when a caller needs a user's earlier correction, repeated assistant discussion or tool output mentioning the same keyword could fill that budget first. The filter applies to active and archived messages before the eight-result limit, using the role already stored in archive records; omitted or null keeps the unchanged all-roles search, returned roles stay human/ai/tool, an unknown role returns an error, and no storage migration or history_read change is involved. (#5927)

• subagents: Delegations can opt into a JSON syntax acceptance criterion, acceptance_criteria=["file:../outputs/report.json json-valid"], on both task and batch_task. A delegated task could produce a non-empty report.json that is not valid JSON, and the existing existence and non-emptiness checks could not express the difference. The criterion holds for complete UTF-8 JSON up to 50,000 bytes; invalid JSON, empty files, and NaN/Infinity do not hold; a missing file is negative once absence is established; oversize, incomplete, or unavailable reads and parser resource limits stay UNVERIFIED. Local reads are bounded binary reads; remote reads keep the fresh-shell, absolute-utilities, regular-file, and containment checks and transfer at most 50,001 bytes through a base64 envelope, with no unbounded read_file fallback — unsupported remote tools stay UNVERIFIED. Scalars, duplicate keys, and syntactically valid large numbers are allowed; a UTF-8 BOM is rejected. Syntax only — no schema or business-field checks; existing criteria and verdict semantics are unchanged. (#5947)

Memory

• memory: Cross-session memory gains user.cognitiveStyle for stable collaboration preferences (response structure, depth, correction style), stored and injected separately from personalContext and task skills so a protocol like "conclusions first" no longer competes with project facts under max_injection_tokens. Legacy memory.json files are normalized on load, the <memory> injection gains a Thinking Style: line (plus optional category: cognitive facts), and the field is editable in Settings → Memory and exposed through the Gateway memory API. (#3182)

• memory: The sample-memory loader can now bulk-load registered users. It previously wrote the legacy shared memory path while authenticated users read per-user storage, so a successful load still left Settings showing no memory. scripts/load_memory_sample.py requires exactly one of --target PATH or --all-users; --all-users enumerates registered users from the configured persistent database and backs up each user's existing memory before replacing it. Non-persistent database modes are rejected. (#4066)

• memory: Memory search and injection can rank candidates by lexical relevance instead of confidence alone. Confidence-only injection could prefer unrelated facts over ones useful to the current task; opt-in retrieval_relevance_enabled (default false) blends IDF-weighted query coverage with confidence, applies category filtering before top_k, and can diversify selections — no embeddings, vector storage, or persisted-format changes; the tokenizer handles CJK bigrams without new dependencies. Legacy get_context implementations keep working. (#5251)

• memory: Add an opt-in tolerant MarkdownMemoryStorage (memory.storage_class: markdown) for the user-memory summary store. Corrupt or partially written files no longer raise MemoryStorageCorruption and crash the agent: a Markdown summary is understood via a lossless fenced memory-json block with a best-effort structured fallback, and plain JSON still loads. The on-disk JSON format and the JSON UI are unchanged, and writes remain journaled JSON — this ships read-path tolerance only; a full Markdown write path is a follow-up. (#5545)

• memory: Add a deterministic DeerMem scope-isolation benchmark under backend/scripts/benchmark/deermem_scope_isolation. The opt-in validate/run/report workflow exercises lifecycle durability, concurrent corrections, and isolation across agent and user memory scopes, and changes no runtime memory behavior. (#5564)

• memory: The memory management API — read, reload, status, import/export, clear, and single-fact CRUD — accepts an optional agent_name and then operates only on that agent's bucket, so each custom agent's memories can be inspected and maintained in isolation. Omitting the parameter preserves the existing behavior: reads and import use the default bucket, and clear stays user-wide. Names are validated (letters, digits, hyphens; otherwise 422), and a backend must declare supports_agent_scoped_management or scoped requests fail with 501 instead of silently editing the wrong bucket. The Gateway preserves the caller's spelling because Mem0 treats the agent name as a case-sensitive storage identity, while DeerMem keeps its own lowercase canonicalization. (#5565)

• memory: Memory extraction gains an opt-in Jev (TypeSafe) pre-screen and signal classification, both off by default. memory.prescreen (off / shadow / enforce) classifies each conversation batch before the extraction LLM call: shadow only records the verdict; enforce lets a low-probability batch skip the call and advance the watermark, consuming that batch as "nothing durable here". memory.signal_classification (off / shadow / hints) merges reinforcement/correction labels into the extraction hints and, only while the pre-screen is enforce, may veto a skip. Both ride a new shared TypeSafe client, deerflow.typesafe, extracted from the guardrail risk gate — whose behavior is unchanged — with one error taxonomy: a request-level failure raises, a question-level failure is data (AnswerSet.errors_by_question). A new optional top-level typesafe: block (api key/env, base_url, model, timeout, deadline, attempts, backoff) is shared by all consumers; consumer config still wins, so existing guardrail deployments keep working. config_version moves 49 → 50 (make config-upgrade merges the keys), and backend/scripts/eval_memory_prescreen.py runs the shadow evaluation — exact Clopper–Pearson miss bound, per-stratum checks — that must pass before enforce; missing evidence reports INSUFFICIENT. (#5906)

Knowledge & retrieval

• knowledge: Custom-agent chats can scope RAGFlow retrieval per message. An opt-in Knowledge selector picks all operator-approved datasets, specific datasets/files, or no retrieval for one turn; the choice is stored as a validated, immutable knowledge_scope snapshot on the HumanMessage and enforced at Gateway admission, middleware, RAGFlow retrieval, and native and batch subagents — out-of-allowlist selections fail closed, and scope ids never reach model inputs or tracing. Off by default via knowledge_base.scope_selection_enabled (config version 41). (#5238)
• ragflow: RAGFlow retrieval results now carry verifiable source citations. Clicking an inline knowledge citation, a document-title link in Sources, or the answer's knowledge sources list opens the retrieved excerpt, dataset and document names, and page numbers when RAGFlow supplies them, and sources remain available after conversation reload. knowledge_search pairs the opaque citation links with bounded native tool-message artifacts holding the exact excerpt given to the model (truncation marked, configured API key redacted); ordinary task results forward only captured sources cited in the child's result; and output budgeting retains complete evidence entries under the active limit, omitting non-fitting entries with a notice. Missing records display as unavailable. These are retrieval-time evidence snapshots, not a live full-document viewer; existing direct knowledge_search() callers keep the string return type. (#5551)
• community: The image search tool exposes the color and license_image filters. Both were wired into the request path but unreachable from the tool signature, so agents could not narrow results to a palette or to license-cleared images when sourcing references for image generation. Valid values follow ddgs (color: Monochrome through White; license_image: any, Public, Share, ShareCommercially, Modify, ModifyCommercially); unset filters produce exactly the same request as before. (#5723)

Skills

• skills: Show which skills an answer loaded, with inspectable snapshots. Successful configured SKILL.md reads and explicit slash activations now record a bounded, read-only snapshot, and the answer toolbar gains a Skills menu listing only the skills that answer's own run loaded; selecting one opens the captured file (original Markdown including frontmatter, package-relative links kept as non-navigating references) in a resizable desktop panel or a mobile sheet, with copy returning the original Markdown. The run journal persists a first-load-order aggregate on the terminal answer so paginated history keeps the evidence, and the entry is hidden when no load evidence exists. (#5758)

Models & integrations

• community: New Unbrowse web_fetch provider - returns a page as markdown over plain HTTP, or through Unbrowse's hosted cloud browser for JavaScript-heavy pages (render: auto|never|always). One JSON-RPC POST per fetch, no new dependencies. (#5981)

• models: Administrators can manage shared models from Settings → Models without editing server configuration. New administrator-only GET/PUT /api/managed-models and POST /api/managed-models/test endpoints maintain an encrypted catalog under $DEER_FLOW_HOME/managed-models/ — credentials are never returned, omitted keys retain the saved value, and stale edits are rejected by revision. Enabled managed profiles are appended to new effective configuration snapshots; YAML profiles remain read-only and win name conflicts. The first version supports OpenAI-compatible Chat Completions endpoints; existing model authorization still applies. (#5596)

• models: Add a declarative reasoning capability contract for model profiles. A model can declare an optional reasoning: block (thinking: unsupported|optional|required, on_disable_request, dialect, history, and effort: {values, default, aliases, path}) beside the legacy booleans, and contradictory profiles fail at config load. create_chat_model enforces one normalized policy everywhere — lead agent, subagents, summarization, and title generation — so a required-thinking model never enters the disable branch and effort values map through aliases or fall back to the declared default instead of being sent verbatim. GET /api/models and DeerFlowClient gain a reasoning object (source: legacy|contract), the frontend derives the effort menu from the model's declared values (e.g. Low/High/Max for GLM-5.3-Flash) and hides "off" for required-thinking models, and PATCH /api/v1/auth/preferences accepts provider-specific effort tokens. Profiles without the block keep the unchanged legacy path. (#5780)

• community: The InfoQuest tools no longer block the agent event loop. InfoQuestClient.fetch/web_search_raw_results/image_search_raw_results used blocking requests.post(..., timeout=30), so with the community tools enabled each call could stall the loop for up to 30 seconds. They now use httpx.AsyncClient, the web_search/web_fetch/image_search tool wrappers are coroutines, and web_fetch offloads the CPU-bound readability extraction via asyncio.to_thread — matching the earlier jina_ai migration. Return values, error strings, and the 30-second transport timeout are unchanged. (#5782)

• community: The Tavily web_search/web_fetch tools stop blocking the event loop: _get_tavily_client() now returns AsyncTavilyClient, and web_search_tool/web_fetch_tool are coroutines that await client.search(...)/client.extract(...), closing the client on every outcome. Credentials handling is unchanged — with no key in the tool config the client is still built with api_key=None, so the SDK keeps reading TAVILY_API_KEY from the environment. (#5784)

• community: The Firecrawl web_search/web_fetch tools become coroutine tools: _get_firecrawl_client() returns AsyncFirecrawlApp and the tools await search()/scrape() instead of the previously blocking sync calls. Result normalization, error handling, API key handling, and the custom api_url behavior are unchanged. (#5786)

• community: The image-search tool no longer runs DuckDuckGo search on the event loop. image_search_tool is now a coroutine that offloads both config resolution and the blocking DDGS call to a worker via asyncio.to_thread (the ddgs SDK has no async API), keeping the loop responsive during config file access and network I/O. Search parameters, result shape, timeout, and error handling are unchanged; an already-started request cannot be cancelled and may keep a bounded worker alive until the existing 30-second timeout. (#5788)

Channels

• channels: WeChat can be connected by scanning a QR code from the web UI. The connection dialog in the sidebar and Settings gains QR login with progress, pairing-code input, expiry and retry states, and a "Scan again" option that preserves an unexpired binding command; credentials are saved on the backend and only the WeChat channel restarts. New WeChat connections default to QR login, with manual token entry still available. (#5582)
• scheduler: Push scheduled-task outcomes to the owner's bound IM identities via a durable notification_deliveries outbox and NotificationDeliveryWorker. Activates only when channel_connections.enabled is true and a channel service is running; manual triggers and interrupts stay silent, and a target disconnected while its delivery waited is dropped. WeCom implements proactive send_notification; other providers fail visibly in the outbox until they grow a push path. (issue #4254, #4843, #6135)

Auth & guardrails

• authz: Make the skills policy key govern visibility on the user-facing skill listing surfaces. A role whose policy denied skills still saw every skill in the slash-command autocomplete, GET /api/skills, GET /api/skills/custom, and GET /api/skills/{name}, discovering the denial only at activation time. Listing visibility now goes through filter_resources(principal, "skill", ...), mirroring list_models: denied names disappear from the listings, the detail endpoint returns a 404 byte-identical to a genuine miss (no existence oracle), anonymous callers stay unfiltered, and provider resolution errors follow authorization.fail_closed. Admin management endpoints stay require_admin_user-gated; runtime activation authorization remains #4541's layer. (#5489)
• middleware: Add deterministic, opt-in PII redaction for model-bound context (pii_redaction.enabled, default off). PiiRedactionMiddleware rewrites PII in genuine user messages and remote-content tool results (same allowlist as the tool-result sanitizer) to irreversible placeholders like [EMAIL_1], using regex-only detectors — email; OpenAI/AWS/GitHub/Slack/Google API keys; Luhn-validated credit cards; international/CN/US phones; CN ID, CPF, CUIT/RFC national IDs. No mapping is stored. Placeholder numbering is stable across turns (the conversation is re-redacted per model call with value-deduplicated counters), externalized tool-output copies hold redacted text too, and subagents inherit the middleware automatically. Raw text stays in thread state; default behavior is unchanged. (#5527)
• frontend: Gate composer send on the runs:create permission. Both chat routes resolve canCreateRuns and the shared composer checks it at the top of submitThreadMessage, the single choke point for the submit button, Enter-to-send, goal-set-triggered runs, and programmatic submits. A denied role gets a disabled send button that explains itself via aria-label/title, an info toast on submit, and its draft text kept for retry; while streaming the button remains the runs:cancel stop affordance as before. Absent or null permission lists stay permissive for mixed deployments. Mirrors the stop gating from #5294. (#5528)
• guardrails: New opt-in TypeSafe (Jev) risk gate for tool calls, deerflow.guardrails.typesafe:TypeSafeGuardrailProvider, selected through guardrails.provider.use. Each probed call sends one yes/no question with the tool name and full argument JSON to TypeSafe System One and denies at threshold (default 0.5) with an error ToolMessage the model can adapt to. allowed_tools stays a hard permission list enforced locally before any request; oversized or unserializable arguments are refused locally with zero network requests; provider errors follow guardrails.fail_closed. This is the only guardrail provider that sends tool arguments to a third party — assess egress before enabling. config_version moves 46 → 47. (#5712)
• authz: Gate plugin actions and management operations through the configured authorization provider. POST /api/plugins/{ns}/actions/{name} now requires a plugin_action/invoke decision on <ns>/<action>, checked after resolution and before the request body is read, denying with 403; new require_plugin_management/arequire_plugin_management in deerflow-extension-api give contributed management routes a fail-closed check with independent read/write scopes; built-in RBAC gains plugin_actions and plugin_management keys, an omitted key leaving the resource unrestricted; plugin tool descriptors now report source: "plugin:<namespace>". Enforcement stays off until authorization.enabled: true; extension-api contract 0.2.4 and config_version 49. (#5842)

Extensions & plugins

• plugins: Full-stack plugin APIs and a bookmark example package. A deployment-installed Python extension can now ship its own browser page, conversation actions and model tools: registry.plugin(PluginContribution(...)) (extension-api 0.2.2) registers contributions in one plugin namespace, authenticated descriptors, ES modules and declared actions are served under /api/plugins, and the frontend loads plugin pages, workspace pages and conversation actions at runtime. The deerflow-extension-bookmarks example exercises the path end to end; no plugin ships enabled by default. (#5647)
• plugins: Support manifests and static asset directories for full-stack plugins. BrowserAssets(module, root, manifest="ui_manifest.json") (extension-api 0.2.3) joins BrowserModule: a versioned manifest names the entry module and lists the files served from namespace/content-revision URLs, with authentication, correct MIME types, nosniff, a document sandbox policy, and immutable caching. Packaged entries load as native credentialed module graphs, so a plugin can split its JavaScript and resolve CSS/images with relative imports; existing inline modules keep working. (#5685)
• extensions: Extension routes can request a run-evidence reader bound to the authenticated request user. New resolve_run_evidence_reader(request) / require_run_evidence_reader(request) APIs return an immutable user-scoped RunEvidenceReader gated by runs:read, with invisible-run behavior and scope-bound cursor validation preserved. The existing global reader stays available to trusted Gateway-lifetime services. deerflow-extension-api is bumped to 0.2.2. (#5727)
• plugins: New standalone deerflow-extension-jev-context example plugin (community.jev-context) prunes stale tool results from long conversations. Through the lead agent's before_model/abefore_model hooks it asks Jev about old read-only tool results and shortens low keep-probability ones, protecting recent messages, tool-call records, host-stamped errors, skill reads, and multimodal content. Requires deployment opt-in and an environment-only Jev key; failed requests preserve the original history. Pruning is lossy and persists in graph state — disabling the plugin does not restore omitted text. (#5731)
• plugins: New standalone deerflow-extension-jev-classify example plugin (community.jev-classify) contributes a classify_texts model tool that labels {id, text} items against 2-32 caller-supplied categories and returns one label and status per item in input order. Two deployment-selected backends: Jev (one choice question per item) or an OpenAI-compatible chat endpoint asked for a validated JSON label list. Calls are batched (default 10 per request) with bounded concurrency and a 25s deadline; failures are explicit per item, and nothing is retried. (#5735)
• extensions: Packaged extensions can now invoke the host model under operator-granted limits. plugins[].host_access.model_invocation maps logical roles to models with shared per-installation concurrency, bounded admission, timeout, and input/output limits; extension API 0.2.4 adds the request/result contracts and ExtensionRuntimeDeps.model_invoker. Calls use the host model factory and tracing with inline Draft 2020-12 schema validation in child processes; ungranted extensions still get None, and grants follow the restart-required plugin lifecycle. (#5796)
• examples: Add deerflow-extension-jev-screening, an opt-in packaged extension that flags injected instructions in fetched content as advisories. A TOOL_VISIBLE middleware classifies each text message in visible web_fetch/web_search/image_search/web_capture and MCP tool results with its own model request over the sanitized excerpt (at most eight messages per call), and before_model replaces the flagged messages of the latest tool step with a fixed advisory prefix, never mutating the originals. Loaded from plugins:; inert until its config.enabled is set, provider failures and timeouts pass the result through, and runs without a task store screen nothing. (#5833)

Persistence

• persistence: Add a checkpoint retention service implementing the deletion side of #4189 item 3 on the #5255 contract. Trailing duration-only leaves are pruned by default (each materializes its parent's payload, so removal reclaims parent-sized rows without touching the surviving line); superseded leaf sibling branches stay opt-in via prune_leaf_sibling_branches because clients may hold them as resume targets. The resume head, its ancestor chain, and checkpoints with live pending-writes rows are protected. No production trigger yet — the invocation wiring lands separately. (#5308)
• storage: Add a content-addressed blob store contract (deerflow/storage/), the storage-abstraction half of #4189 item 2. BlobRef (sha256, size, kind, content type) plus a tiered BlobStore interface ship with a local_fs default backend: sharded layout, atomic publish, digest verified on read, and concurrent puts converge. Purely additive and opt-in — blob_storage.enabled defaults to false and no producer is migrated yet (viewed images and externalized tool results are the named follow-ups), so unset deployments behave exactly as today. (#5361)

Frontend

• frontend: Unify the Capability Center into a searchable catalog with plugin configuration and custom-agent selection. Catalog entries over the existing MCP, Lark CLI, and skill services carry localized metadata, categories, icons, and editable configuration forms; MCP installs validate required transport fields before saving, ordinary users see safe installation projections, and administrator mutations keep their role checks. Custom agents gain stable MCP installation IDs with explicit plugin/skill selection — an omitted/null selection inherits all enabled connections, an empty list selects none — with colliding installation IDs rejected on write and ambiguous IDs excluded at runtime; selection carries through ordinary and durable batch delegation without changing the shared MCP cache or granting authorization. Bundles DingTalk/WeCom group notification and HubSpot CRM tools; existing MCP and Lark workflows are preserved and nothing is enabled automatically. (#5497)

Fixed

• uploads: Converted Markdown ownership is now recorded when a document is converted. list_uploaded_files hides only verified conversion outputs, and document outlines use only the recorded companion; a user-uploaded Markdown file with the same stem stays visible and cannot become another document's outline. Existing conversions have no ownership record and cannot be safely distinguished from user-authored Markdown. After upgrading, those Markdown files appear separately in historical listings and their source documents have no inferred outline or preview. Re-uploading the source creates a new verified conversion when automatic conversion is enabled. (#6101)

• agents: A retried model call in plan mode no longer loses the todo completion reminder that TodoMiddleware had queued for it. The middleware drained the reminder inside wrap_model_call; because LLMErrorHandlingMiddleware wraps it and retries by calling its handler again, the second attempt went out without the reminder while the run had already spent one of its two reminders on it. TodoMiddleware now puts the drained reminder back when the handler raises, without counting it again, so the retry carries it and the cap still allows the second reminder. Successful calls are unchanged, and a run whose reminder state was cleared meanwhile does not get it back. (#6132)

• channels: Stopping or restarting the Slack, Feishu, DingTalk or Discord channel no longer freezes the Gateway event loop. SlackChannel.stop() called SocketModeClient.close() inline, which joins the SDK's message-processor thread (about 0.7s every time) and waits for in-flight event listeners, whose blocking Slack Web API calls can run up to the client timeout; Feishu and DingTalk joined their SDK threads inline with a 5s timeout, and because those threads only exit on a fatal error the join normally waited the full 5s; Discord joined its client thread inline with a 10s timeout, which a timed-out client close or a slow drain could use up. Every run, stream and channel on the Gateway stalled meanwhile, including on POST /api/channels/{name}/restart. The teardown now runs in a worker thread; Slack's close is shielded and tracked, so a cancelled shutdown leaves it running and a retried stop() awaits it instead of closing twice. (#6134)

• middleware: _externalize_to_sandbox now validates the full byte count of externalized tool outputs instead of only testing non-emptiness with test -s. When a remote sandbox write truncated the file part-way (e.g. disk full or pipe failure), the partial file previously passed validation, handing the model a truncated file path. It now verifies the file size exactly matches the payload, returning None and falling back to inline truncation if a write was truncated. (#6112)

• gateway: A non-ASCII CSRF token, GitHub webhook signature, internal auth token, OIDC state, or provisioner X-API-Key is now rejected with the usual 403/401 instead of a 500. hmac.compare_digest raises TypeError for str operands with non-ASCII characters, and Starlette decodes header bytes as latin-1, so a single 0xE9 byte crashed the comparison. The Gateway now compares the UTF-8 bytes through one helper, app.gateway.utils.constant_time_equals, and the standalone provisioner encodes inline. No bypass was possible; the request was already failing, just with the wrong status. (#6076)

• agents: Context-compaction fraction triggers and fraction-based retention now use the active run model's context profile; a separate summarization.model_name remains generation-only. This prevents mismatched run and summary windows from compacting too late or too early. The middleware release identity now records profile_model separately from summary_model, intentionally refreshing the identity when either owner changes. (#5566)

• events: Run-scoped reads no longer return 500 on the JSONL backend for a run ID it cannot use as a filename. GET /api/threads/{thread_id}/runs/{run_id}/events, .../messages, and .../workspace-changes pass the URL's run ID to the event store unchecked; with run_events.backend: jsonl an ID such as run.1 raised ValueError, while the memory and database stores return an empty result. JSONL reads and deletes now treat such an ID as an unknown run; writes still reject it. (#6070)

• agents: A run started with "max_total_subagents": null in its context now uses the configured subagents.max_total_per_run instead of failing with a TypeError. The key was present, so dict.get(key, default) returned None, and building SubagentLimitMiddleware crashed that run with an internal error (the web UI never sends the key; API and embedded-client callers could). The Gateway lead agent, DeerFlowClient, and the system prompt now resolve the cap through one helper that treats null as unset and clamps to 1-50, so the extension-facing host policy and the release policy also report the enforced cap rather than an out-of-range request. (#6088)

• scheduler: Fixed-hour cron tasks no longer fire twice on the daylight-saving fall-back day. croniter returns both occurrences of an ambiguous wall-clock hour (the first with fold=0, the second with fold=1). For tasks where neither minute nor hour contains a wildcard, the second occurrence is skipped to preserve once-per-day semantics (Vixie cron contract), while wildcard schedules (such as 0 * * * *) still run in both occurrences of the repeated hour. (issue #6052, #6066)

• persistence: A SQLite checkpointer.connection_string written as a file: URI now fails at startup instead of silently writing somewhere else. LangGraph's SQLite checkpointer and Store open connection strings without uri=True, so SQLite treated the URI as a literal filename: file:checkpoints.db?mode=rwc created a file with that exact name in the working directory, file::memory:?cache=shared persisted to disk, and a file:///... URI failed to open. The readiness probe did parse URIs, so it checked a different file than the runtime used and reported in-memory URIs as not_configured. All four SQLite checkpointer/Store factories now reject file: URIs with an error that names the setting, and /health/ready reports them unreachable. Use a filesystem path or :memory: instead. (#6069)

• config: make config-upgrade (also run by make dev / make start) upgrades the config.yaml the Gateway loads. With both <checkout>/config.yaml and backend/config.yaml present, the script upgraded the backend/ copy while the Gateway read the checkout copy, so the file in use stayed outdated even though the upgrade reported success. It also ignored DEER_FLOW_PROJECT_ROOT and a DEER_FLOW_CONFIG_PATH set in .env, and fell back to another file when DEER_FLOW_CONFIG_PATH named a missing one. The script now asks the harness resolver (AppConfig.resolve_config_path) for the file, and a missing DEER_FLOW_CONFIG_PATH or invalid DEER_FLOW_PROJECT_ROOT fails with the Gateway's error instead of upgrading a fallback. (#5991)

• sandbox: Unwrap Overwrite-wrapped sandbox state in ToolOutputBudgetMiddleware and ReadBeforeWriteMiddleware. In delta checkpoint mode, forked or restored threads deliver the sandbox channel wrapped in LangGraph's Overwrite. Without unwrapping, isinstance(sandbox_state, dict) returned False, causing large tool output externalization to fail and fall back to inline truncation, and read-before-write lock scoping to miss the active sandbox ID. (#6015)

• doctor: make doctor now checks the config file the Gateway actually loads. It always inspected <checkout>/config.yaml and ignored DEER_FLOW_CONFIG_PATH and DEER_FLOW_PROJECT_ROOT, so a missing override that stops the Gateway from starting still reported ✓ config.yaml found and ✓ config.yaml loadable, and a valid override pointing elsewhere got the wrong file checked. Doctor now resolves the path through the harness's own resolver and hands it the location variables the way make dev does: .env values override the shell (expanding an unquoted leading ~), and an unset or empty DEER_FLOW_PROJECT_ROOT becomes the checkout. An override the Gateway would reject fails config.yaml found with the Gateway's error, and the config checks skip. (#5987)

• database: DatabaseConfig now validates pool_size, pool_recycle, and command_timeout strictly. Previously, YAML booleans (true/false) were coerced to 1/0 respectively, allowing pool_size: true (pool size 1) and command_timeout: true (a 1-second statement timeout) to silently pass configuration loading. pool_size also accepted non-positive values (0, -1), and command_timeout accepted inf (which never times out). pool_size and pool_recycle now enforce positive integers, and command_timeout rejects booleans and non-finite floats while retaining null to disable timeouts.

• frontend: The optimistic human bubble keeps its quote and conversation reference chips once a file upload finishes. The upload-complete update replaced the bubble's additional_kwargs with only the uploaded files, so those chips disappeared until the server echoed the message; project attachments staged with the send were also missing from the bubble, both while uploading and after. The submitted message was always intact. The optimistic copy (before and after the upload) and the submit now build additional_kwargs through one helper, buildHumanMessageAdditionalKwargs. (#5982)

• scheduler: Editing an interval task's title or prompt no longer fails with a 500. The edit dialog always sends schedule_spec beside the changed field, and when the cadence is unchanged PATCH /api/scheduled-tasks/{id} keeps the task's existing next_run_at — a value the repository had handed back serialized as an ISO string. ScheduledTaskRepository.update() assigned it to the DateTime column untouched, so SQLite raised StatementError ("only accepts Python datetime") and Postgres a DataError; only changing the cadence worked, because that path computes a fresh datetime. The repository now coerces every serialized timestamp it accepts in update(), as update_after_launch() already did. (#5964)

• gateway: GET /api/skills, GET /api/skills/custom and GET /api/skills/{name} no longer walk the skill directories on the event loop. Each called load_skills() inline, which resolves the caller's storage, scans every public and custom skill directory and parses each SKILL.md — filesystem work that grows with the number of installed skills. #5747 moved that same call off the loop for the custom-skill content route and documented why; these three routes were missed, so the strict Blockbuster gate raised BlockingError on them and, in production, a large or slow skills tree stalled every other request on the worker for the duration of the scan. All three now offload the load with asyncio.to_thread through one shared helper. (#5945)

• gateway: GET and PUT /api/user-profile no longer run their filesystem work on the event loop. Both handlers resolved the per-user USER.md path (which builds absolute paths on every call), stat'ed, read, created the user bucket and wrote the file inline, while every other handler in the custom-agent router offloads that work with asyncio.to_thread. Under the strict Blockbuster gate the pair raised BlockingError; in production a slow disk stalled every other request on the worker for the duration. Both handlers now offload the whole resolve-stat-read / resolve-mkdir-write sequence. (#5935)

• docker: Project-document uploads larger than 1 MB no longer fail with a bare nginx 413 through the unified entry point. POST /api/projects/{id}/documents is a multipart upload that Gateway accepts up to uploads.max_file_size (50 MiB by default), but no nginx location matched it, so it fell through to the /api/ catch-all and nginx's default client_max_body_size 1m rejected the request before Gateway saw it — a 2 MB PDF was refused while the same file uploaded fine into a thread. All three maintained configs (Docker, make dev, Helm) now give /api/projects/{id}/documents its own location with the thread-uploads settings (100M ceiling, streamed request body) and the read timeout the catch-all already granted; the catch-all itself keeps nginx's defaults. (#5934)

• docker: The production stack (make up / scripts/deploy.sh) now starts on hosts with IPv6 disabled. docker/nginx/nginx.conf also listens on [::]:2026; on a kernel booted with ipv6.disable=1 that listen makes nginx exit at startup, so the container restart-looped and make up never became healthy. The dev compose file has stripped the IPv6 listen when /proc/net/if_inet6 is absent since #2027, and the Helm chart mirrors it; the production compose file was the one launcher still without the guard. It now uses the same launcher, and starts nginx with exec so it is PID 1. (#5900)

• deploy: make up / scripts/deploy.sh now honors BETTER_AUTH_SECRET and DEER_FLOW_INTERNAL_AUTH_TOKEN written to the repo-root .env. The script only checked the shell before reloading a persisted secret or generating a new one and exporting it, and Compose interpolation lets shell variables outrank --env-file, so the value the deployment docs tell operators to put in .env was silently replaced: sessions were signed with a secret the operator never chose, and Gateway workers running outside the stack with the configured token got 401. A .env-provided secret is now left for Compose to read itself (shell → .env → persisted file → generated). Whether .env provides one is decided by Compose itself — the script renders a stub project with ${KEY} through docker compose config and reads the value back — so KEY: VALUE lines and ${VAR} interpolation count the way Compose counts them on every Compose v2 client. A value that resolves empty, like an exported-but-empty shell variable, still triggers generation because Compose would otherwise pass the empty value through. (#5928)

• skills: skill_manage(action="remove_file") and write_file now work on binary support files, and reject directories cleanly. A .skill archive may carry assets/logo.png (the installer only rejects executable binaries), but both actions read the previous content as UTF-8 text — purely for the history record — before touching the file, so a binary member raised UnicodeDecodeError and was never removed or overwritten. A bare support directory such as assets also slipped through path validation and raised IsADirectoryError. Non-text content is now recorded as no previous text, and a directory path is a validation error instead of a crash. (#5893)

• models: when_thinking_enabled and when_thinking_disabled no longer replace a profile's whole extra_body on the legacy (no reasoning: block) path. Both templates were applied with a shallow dict.update, so a profile carrying extra_body: {tool_stream: true} beside when_thinking_enabled.extra_body.thinking / when_thinking_disabled templates — the shape of most extra_body-based examples in config.example.yaml — lost tool_stream in both directions, while the synthesized disable payloads and the contract path already deep-merged. Both legacy templates now deep-merge the same way. The merge semantics are: keys are never removed, a template can only add or override, nested mappings inherit the profile's other keys, and template values win on conflicts. The merge also keeps the template's vLLM switch authoritative across its two spellings: when a profile spells the switch differently from its template (chat_template_kwargs.enable_thinking: false beside the legacy thinking: true alias), the template's value is mirrored onto the profile's spelling, so VllmChatModel and plain OpenAI-compatible classes alike send the template's intent under whichever key the server reads — on both the legacy and the contract path, in both directions. Non-mapping template values are forwarded unchanged. Migration note: because keys are never removed, a when_thinking_disabled template can no longer clear a key the profile's base extra_body sets — a base extra_body.thinking: {type: enabled, budget_tokens: 4096} now reaches the provider as {type: disabled, budget_tokens: 4096} when thinking is off, which Anthropic-style APIs reject. Enable-only keys such as budget_tokens belong in when_thinking_enabled, not in the base extra_body; the synthesized disable payloads and the contract path already behaved this way. Templates are also deep-copied as they are merged, so constructor kwargs never alias the cached profile. (#5894)

• projects: The conversation-files view no longer shows an empty heading for a member thread that has no title yet. A thread's display_name is null on the wire until title generation has run (or if it never does), but the file-group type declared it as a required string and rendered it as-is, so files uploaded before the first reply sat under a blank line. Such groups now read "Untitled", matching the project's thread list. (#5879)

• skills: Deleting a custom skill whose package directory is an operator-managed symlink now succeeds. The storage contract accepts a one-level link under custom/, but delete_custom_skill removed the package with shutil.rmtree, which refuses symlinks: the delete failed with OSError after its history record had been written, the user's projected skill view was cleared on the way out, and DELETE /api/skills/custom/{name} answered 500. The link itself is now removed; the external tree it points at is never touched. (#5881)

• frontend: Stop mutating subtask render state during MessageList render. Subtask synchronization moved from render into an effect, so cards immediately receive pure message-derived snapshots even before the task context publishes an update — fixing the regression where final streamed arguments and task_started arrive together but the card keeps its partial title or empty prompt. Message arguments supply title, prompt and subagent type; live state preserves lifecycle, model, usage and step history, with terminal snapshots keeping status/result precedence. (#3157)

• skills: Surface failed skill enable/disable requests in Settings instead of treating them as success. The frontend skills helpers parsed the response JSON without checking response.ok, so a 4xx/5xx from the skills list or toggle endpoints resolved as success and the UI flipped the switch even though the backend rejected the change. Non-OK responses now stay on the error path and show the backend error message. (#3823)

• agent: Align unattended-run prompting with the tool policy. Non-interactive runs removed ask_clarification from the toolset while the system prompt still demanded it for ambiguity, leaving GitHub, webhook, and scheduled runs unable to ask or proceed. A shared RunInteractionPolicy now drives both toolset and prompt — webhook infers from issue and event context, exiting with structured blocking information when context is insufficient; scheduled/autonomous make minimal reversible assumptions and report high-risk ambiguity as blocked. (#4919)

• mcp: Make the durable MCP task claim lifecycle cancellation-safe. Caller cancellation after a claim was acquired could leave rows leased until expiry, abandon a started release, or let cleanup failure replace the original CancelledError; routine shutdown was also recorded as a task failure. Compensation now covers every await after the claim, ambiguous operations stay service-owned past the foreground deadline, and per-claim lease tokens reject stale-generation writes atomically (closing a SQLite race). Migration 0026 adds nullable lease-token columns; no public MCP API changes. (#4966)

• frontend: Keep streamed answer text out of the Thinking panel. A streaming AI message that already carried reasoning plus answer text was grouped into the processing disclosure until the turn settled, so the answer could sit in the Thinking panel for a long run; such messages now render as an assistant bubble immediately while plain pre-tool narration stays grouped. The bash tool's model-visible contract also describes cross-platform local environment discovery — start with uname -s, use sw_vers on Darwin, recover from blocked absolute paths with command-only probes. (#5001)

• runtime: Harden model response recovery at provider boundaries. An empty completed response could end a run with no usable answer, and length-capped responses could carry truncated tool calls into the loop. A true empty stop is now retried once at the model boundary (one shared retry per run); exhaustion yields a visible same-step fallback instead of a hidden graph-level recovery turn; a detected length cap drops all tool calls in that response, even with parsed arguments. DeepSeek thinking-mode history keeps reasoning_content on assistant tool turns. (#5080)

• sandbox: Reject overflowing sandbox ownership lease TTLs at config validation. renewal_interval_seconds and ttl_multiplier were each checked finite, but their product could overflow to inf, failing only at the first lease write or silently changing the promised timing. Non-finite derived TTLs and sub-millisecond Redis TTLs are now rejected, Redis TTLs are capped at half the signed 64-bit millisecond range, and fractional milliseconds round up so the stored lease is never shorter than validated. (#5104)

• subagents: Close the subagent graph stream before releasing runtime resources. Cooperative cancellation could return a terminal result without explicitly closing the active agent.astream() iterator, so the executor released the sandbox lease and sent the task-stop notification while graph-stream teardown was still in flight. The stream is now retained and closed before terminalization and release, the original stream error or host cancellation wins if close also fails, and teardown still running after 10s logs a warning. (#5221)

• composer: Reserve context as a slash command alias. /context compact is a built-in composer command, but context was not reserved in the shared slash-skill contract, so a skill could claim the alias and shadow it. The shared contract now reserves context, frontend and backend slash parsing stay aligned through it, and IM channel command classification is unchanged. (#5279)

• scheduler: Preserve a one-time task's execution instant across title and prompt edits. The schedule control converted the stored timestamp to minute-precision local time and back on mount, so in New York 2026-11-01T06:30:00Z was saved as 05:30:00Z and ordinary timestamps lost seconds and milliseconds — a metadata-only edit silently moved the run. The edit form now snapshots the original timestamp, local input, and timezone and re-emits the original run_at until the time or timezone changes. (#5330)

• scheduler: Reject wall times skipped by daylight saving in the one-time schedule form. New York 2027-03-14T02:30 converted to UTC and back as 01:30, so create and edit could save an instant different from the preview. The form now validates local-to-UTC-to-local equality, shows localized inline feedback with the input marked invalid, emits an empty schedule spec until corrected, and keeps Create (and edit-save) disabled. (#5348)

• sandbox: Drain the previous sandbox release during async rebind. Async rebind paths released the previous sandbox client through a bare await asyncio.to_thread(provider.release, ...); cancelling the caller cancelled only the awaiter and let the per-thread lifecycle serializer release while the old release was still running, so a later same-thread lifecycle transition could overlap it. The three async previous-release paths now route through the cancellation-safe run_sync_lifecycle_operation() helper, which holds the serializer until the old release completes and then propagates the original CancelledError. (#5498)

• subagents: Close delegation-ledger entries a stopped run left in progress. On Stop, the task tool cancels the subagent and re-raises cancellation, so no ToolMessage is written and the ledger keeps the delegation in_progress — every later model call was told the work was "already delegated; do NOT delegate again" and waited for a result that never arrived. When a run starts with a new user message, DurableContextMiddleware now marks such entries cancelled ("cancelled attempt; may retry with a changed plan"). Resumed runs, goal continuations sharing the run id, and entries with a result are unchanged. (#5507)

• frontend: Keep clarification text outside the execution-steps panel. Answer text accompanying an ask_clarification call rendered inside the bordered execution panel, and submitting a hidden reply moved previously completed answer bubbles back into it while the continuation streamed. Clarification results now act as completed-run boundaries so earlier answers stay in the conversation across continuation and reconnect, and the accompanying text renders once outside the panel with the original messages, tool-result associations, and usage accounting preserved. (#5508)

• projects: Drain trash reconciliation file workers across Gateway shutdown cancellation. Cancelling the startup trash-retention sweep cancelled only the asyncio awaiter while its executor worker kept walking/statting/unlinking files, so _shutdown_startup_trash_sweep() could finish Gateway teardown while the detached worker was still mutating the projects tree. Both reconciliation run_file_io() operations now drain through the cancellation-safe await_drained() helper: an already-started worker reaches terminal state first, then cancellation propagates and later stages never start. The hook timeout stays the graceful-completion budget, not a hard cap after cancellation. (#5511)

• mcp: Insert bare-filename rewrites literally instead of as a regex replacement template. _rewrite_unique_bare_filenames passed the correlated /mnt/user-data/... path to Pattern.subn as a template, so a literal backslash in a filename (a model passing a Windows-style path to a stdio MCP server on POSIX creates a file literally named screenshots\q3.png) either raised re.error: bad escape out of the tool-call conversion and failed the whole call after the server had already written the file, or — for escapes re accepts — silently substituted the escape byte (\r became a CR) into the returned path, riding it into the transcript and checkpoint. The replacement now goes through a callable, so the path is inserted verbatim. (#5522)

• nginx: Allow model-bound /api/ and /api/skills requests to outlive 60 seconds. The catch-all location /api/ (e.g. POST /api/runs/wait, which also cancelled the run when nginx dropped the upstream connection, and POST /api/input-polish) and location /api/skills (.skill installs scan every archive file with sequential LLM calls) still used nginx's 60-second proxy_read_timeout default and failed with 504. Both locations now set proxy_read_timeout 600s, matching the model-bound locations; applied to the Docker, make dev, and Helm nginx configs. More specific locations are untouched. (#5524)

• subagents: Drain the owned batch-service stop across caller cancellation. SubagentRuntime.stop() cleared its batch-submitter flag before awaiting SubagentBatchService.stop(); an interrupted await left the runtime reporting no submitter — later stop() calls returned immediately — while the owned service was still part-way through stopping, so runtime-owned batch work could outlive the runtime's lifecycle ownership. The stop now runs in a strongly-owned task that is shielded and drained across repeated cancellation; the first caller CancelledError propagates only after the owned stop reaches a terminal state. (#5525)

• memory: Drain Gateway memory shutdown workers across lifespan cancellation. The flush and backend close ran as separate asyncio.to_thread() awaits, so cancelling the lifespan task cancelled only the awaiter: manager.close() could start while the flush worker was still running — closing the backend connection under an in-flight flush — and repeated cancellation could detach the close worker entirely. Manager resolution, shutdown_flush(), and close() now form one owned shutdown operation drained through the cancellation-safe await_drained() helper; the first caller cancellation propagates only after the started work reaches a terminal state. (#5531)

• sandbox: Report an exactly-full sandbox search result as complete. glob and grep in the AIO, E2B, OpenSandbox, Tenki, and BoxLite providers treated "collected max_results matches" as truncated=True, so a tree holding exactly that many eligible matches told the agent its search was partial and it re-ran or narrowed the search for nothing. The filtered-match cap now looks one match past the cap before deciding — a genuinely dropped match still reports truncated — leaving the matches themselves and the remote raw-output cap unchanged. (#5534)

• threads: Clean persisted records safely on thread deletion. DELETE /api/threads/{id} removed the thread directory, checkpoints, browser session, and meta row but left run_events, historical runs rows, and feedback behind — the messages feed stayed readable after the delete (the owner check passes on a missing meta row), and re-creating the same thread id inherited the deleted thread's messages. Deletion now also removes runs, run events, and feedback, owner-scoped and best-effort inside the existing delete reservation; run cleanup deletes only operation_kind == "run" rows so the in-flight delete reservation survives. Durable event stores take an explicit per-thread mutation fence, so a concurrently admitted writer can no longer commit a row for a deleted thread after deletion returns. (#5535)

• frontend: Rejoin active runs after reopening a chat. The SSE reconnect path only knew the run id stored in the current tab's sessionStorage, so reopening the browser or opening a new tab lost the pointer while the server-side run kept going. Opening a thread without a reconnect pointer now discovers the newest pending or running run, persists the pointer before joining so stop/cancel still targets the right run, and rejoins its resumable stream, retrying a failed recovery twice with bounded 1s/2s delays; a matching pointer suppresses duplicate joins. (#5536)

• channels: Roll back a partially started channel service across startup cancellation. start_channel_service() published the global singleton before awaiting ChannelService.start(), so cancellation after partial resource acquisition exited without stopping the service and left a singleton whose startup never completed. Startup failure/cancellation now rolls back the partial service and drains the rollback across repeated cancellation with await_drained(); the singleton clears only after cleanup succeeds, and a failed cleanup retains it so later shutdown can retry. (#5537)

• docker: Add a make prod-logs entry point for the production stack and stop make docker-logs from exiting silently after a production start. make up runs compose project deer-flow while make docker-logs tailed the dev project deer-flow-dev, which has no containers then, so the command printed nothing. scripts/docker.sh logs --prod now tails the production stack with the same compose file, --env-file ../.env, and the interpolation defaults deploy.sh exports (without them compose cannot parse the production volume specs on checkouts without a .env); dev-only logs with no containers print a hint pointing at make prod-logs. (#5538)

• frontend: Preserve literal <think> tags in fenced, indented, and inline code during reasoning extraction, including unfinished code while streaming. The parser only protected an opener immediately following a backtick, so a code example explaining <think> tags was moved into the reasoning disclosure — corrupting the rendered answer and the copied text — and a literal unclosed opener swallowed the following explanation. Real closed or streaming reasoning after literal code is still extracted, and Markdown delimiters inside actual reasoning no longer prevent finding its closing tag, so an unfinished fence there cannot hide the answer. (#5540)

• uploads: Handle a UTF-8 BOM in uploaded Markdown when building document summaries. A leading BOM stopped the outline extractor from recognizing the first heading or opening code fence — in the fence case a code comment became a document heading and the closing fence was mistaken for an opening one, hiding the real sections — and a BOM-only first line consumed a fallback-preview slot. Outlines and previews are now read with utf-8-sig, which consumes the optional BOM while preserving ordinary UTF-8, embedded U+FEFF characters, physical line numbers, and the original uploaded bytes. (#5541)

• gateway: Preserve confirmed clarification-card answers when preparing a thread regeneration. The regenerate endpoint only selected visible human messages, but clarification-card answers are stored as hidden HumanMessage objects with human_input_response metadata, so it could skip the confirmed answer and replay an older visible prompt instead. A regenerate-specific predicate now accepts hidden messages carrying a structurally valid human_input_response and preserves their hidden and request-correlation metadata; summaries, goal-control messages, malformed hidden responses, and unrelated internal messages remain rejected. (#5544)

• sandbox: Wrap the remote_list_dir_command and remote_search_command probe scripts in a subshell so their trailing exit cannot kill the AIO sandbox's implicit persistent shell. A bare exit terminated the session shell and the server's response for that exec_command request never completed, hanging the client indefinitely — making every list_dir/grep/glob call a deterministic wedge and deadlocking entire runs that issued parallel [ls, bash] tool calls. Output markers and exit codes still propagate from the subshell; only the probe scripts change. (#5546)

• uploads: Delete the requested upload entry instead of a symlink's resolved target. delete_file_safe resolved the requested path first and unlinked the result, so a symlink planted at an upload name (the sandbox maps the uploads directory writable) made DELETE /api/threads/{id}/uploads/{filename} remove the target file and its companion .md, leave the dangling link in place, and answer 200 for the wrong file. The requested entry itself is now checked and unlinked: a symlink, like any non-regular entry, returns 404; links pointing outside the uploads directory still return 400; and the companion .md name comes from the requested file. Regular-file deletes are unchanged. (#5547)

• extensions: Drain extension-service shutdown across host cancellation. The Gateway registered extension-service cleanup with AsyncExitStack but awaited stop_services() directly, so a cancellation landing while an extension stop() was blocked aborted the cleanup callback and let stack unwinding continue while extension-owned resources were still alive, breaking the ownership ordering the stack exists to provide. Shutdown now runs through the cancellation-safe await_drained() helper, so later runtime teardown waits until extension services reach a terminal state within the per-service timeout budget. (#5549)

• memory: Report malformed memory.backend_config values by key name instead of unnamed tracebacks. The Honcho backend read failure_policy, workspace_overrides, and user_peer_overrides through a falsy-only or {} fallback, so the most natural YAML spelling — failure_policy: fail_closed as an unquoted string — survived as a truthy non-mapping and crashed with AttributeError: 'str' object has no attribute 'get', naming neither the key nor backend_config. Non-mapping values are now rejected as config errors naming the key, while falsy values still mean unset. The mem0 and OpenViking backends get the same key-naming guard for numeric knobs (top_k, timeout_seconds, ...) instead of bare int()/float() casts that escaped unnamed TypeErrors. (#5555)

• mcp: Scope MCP sessions and durable-task access by thread incarnation. Deleting and recreating the same thread ID reused the previous lifecycle's persistent MCP session scope, and the replacement thread could list, read, and request cancellation of durable tasks created by the old lifecycle because those operations scoped only by user and thread ID. The server-owned thread incarnation now reaches the agent runtime: non-legacy MCP sessions get a versioned (user, thread, incarnation) scope, durable task list, detail, and cancellation bind to the caller-captured and current incarnation, and submissions are atomically rejected when the thread is deleted or recreated between remote submission and local persistence. Explicit legacy NULL incarnations keep the pre-activation scope, worker polling and cancellation keep working through the creating session, and incarnation fields stay out of public task responses. (#5556)

• subagents: Recognize empty regular files in remote subagent acceptance probes. GNU stat -c %F reports a zero-byte file as regular empty file, but the remote size and readability probes accepted only regular file, so an empty artifact was rejected as NONREGULAR and exists, non-empty, and file_written all stayed UNVERIFIED even when the file was present and readable. Both labels are now accepted: empty readable files can satisfy exists and file_written, and non-empty yields a deterministic negative result. Symlink, FIFO, and containment checks are unchanged. (#5559)

• frontend: Derive the web_fetch tool-step title from the first non-blank line of the fetched markdown. extractTitleFromMarkdown() only accepted a document whose very first characters were # , so a blank line or up-to-three spaces of indentation before the first heading — which CommonMark allows, and which the crawl4ai backend hands through unchanged — cost the chat transcript its step title and silently fell back to the raw URL. An indented code block still does not count as a title, and an empty heading yields no title instead of a literal #. (#5560)

• sandbox: Stop E2B reconciliation from reviving warm-pool sandboxes. Every reconciliation pass issued Sandbox.connect() against sandboxes parked in the warm pool — which the SDK normalizes to a 300-second timeout update, pushing the remote expiry forward forever — and the first pass adopted the warm sandbox back into the active set so it was never released again; idle billed VMs stayed alive indefinitely and held capacity slots. Reconciliation now treats locally tracked sandboxes (active or warm) as canonical and never probes them with connect(), refreshes active-sandbox TTLs through the cached client, and sweeps warm entries parked past sandbox.idle_timeout, releasing their ownership leases, mount results, and capacity tracking. Warm sandboxes now actually expire at the configured sandbox.idle_timeout. (#5562)

• utils: Return empty text for content-less messages instead of the literal string "None". message_content_to_text(None) stringified its argument, so a content-less sub-agent final message bypassed the No response generated sentinel, a content-less structured LLM-error fallback hid its error_detail, and the task-continuity archive failed to skip the empty text. Only None content is treated as empty — the literal string "None", 0, False, and list-block conversions behave exactly as before. (#5563)

• doctor: Validate the contents of CLI-backed model credentials in make doctor. The check reported Codex and Claude auth as healthy whenever the credential path merely existed, so an empty, logged-out, malformed, or expired file produced a green checkmark while the model loader could not obtain a usable token. Codex auth.json is now validated across all three supported token layouts and Claude .credentials.json through claudeAiOauth.accessToken including the runtime's one-minute expiry buffer; missing files, directories, non-object JSON, empty tokens, and invalid expiry values report provider-specific failures with the existing remediation hints. The check stays standard-library-only, offline, and redacted; environment and file-descriptor sources remain non-consuming presence checks. (#5567)

• middleware: End length-capped turns cleanly instead of letting TodoMiddleware re-engage the model. When a model hit its per-response output cap (finish_reason=length) while emitting a write_file call, the suppressed call still triggered the todo completion-reminder jump (jump_to=model), re-emitting the same oversized call into the same cap — up to three futile responses with junk fragments instead of a clean truncation notice. TodoMiddleware now skips the reminder jump when the model_length_termination marker is present, the length notice is appended even when partial text survived (fixing a latent append_visible_text bug that silently dropped string content), and write_file's model-visible description is annotated with the configured max_tokens output budget so the model does not assume the 80 KB streaming ceiling is the practical single-write limit. (#5569)

• ragflow: Validate RAGFlow document selections in batches of at most 100 IDs. Selecting more than 100 documents from one dataset is valid under the 1000-document scope limit, but validation sent every ID in a single request, which the provider rejects, so knowledge_search failed before retrieval. Selections now validate in provider-sized batches that preserve input order and the fail-closed behavior for missing or unsearchable documents, sharing one concurrency budget across datasets. (#5572)

• persistence: Drain the PostgreSQL bootstrap advisory unlock across cancellation. The unlock in _postgres_lock()'s finally was awaited directly, so startup/lifespan cancellation arriving while pg_advisory_unlock was still in flight could abort the release and return the connection to the pool while it still held the bootstrap mutex. The release now completes through the cancellation-safe await_drained() helper on the same connection that acquired the lock. (#5573)

• persistence: Drain engine disposal across cancellation during gateway teardown. close_engine() awaited AsyncEngine.dispose() directly, so cancellation while disposal was blocked let teardown return while the process-global engine and session factory still pointed at a partially disposed resource. Disposal now completes through the cancellation-safe await_drained() helper, the globals stay published until it finishes, and stale cleanup can no longer erase a replacement engine. (#5576)

• channels: Photos and files sent to the Telegram bot now download and reach the agent. Two bugs compounded: the download opened a fresh connection on the manager event loop and failed with a generic NetworkError, and the ingested file was written 0600 root:root, so the non-root sandbox user got Permission denied reading it. Downloads now route through a loop-bound download bot, inbound files get sandbox-readable permissions, and failures log the underlying cause with the token-bearing Bot API URL masked. (#5581)

• models: Treat a Codex auth file whose top level is not a JSON object as "no credential from this source". An array, string, or number in ~/.codex/auth.json (or $CODEX_AUTH_PATH) previously raised AttributeError out of CodexChatModel construction, preempting the documented "Codex CLI credential not found" error; the loader now logs and falls through. (#5584)

• memory: Keep an explicit confidence: 0.0 from scoring as the 0.5 default. Two read sites rescued the field with or 0.5, which cannot tell "explicitly zero" from "unset", so a zero-confidence fact was inflated by the default weight and ranked differently depending on which write path indexed it. Zero now ranks strictly below 0.5 through both the FTS5 index and the substring fallback; an absent or null confidence still defaults to 0.5. (#5586)

• skills: Load a SKILL.md saved as UTF-8 with a BOM. The front-matter anchor rejected the leading U+FEFF written by Notepad and PowerShell's Set-Content -Encoding UTF8, so Windows-authored skills silently vanished from the catalog with no warning. The mark is now consumed by the shared compiled anchor and reaches neither skill metadata, rendered instructions, nor the skill-context description, and the loader, validator and middleware copies of the pattern can no longer drift. (#5588)

• models: Skip Claude Code credentials sources with a non-numeric expiresAt. A string, null, list, or object value raised TypeError out of the loader and stopped the lookup loop, so one malformed file at $CLAUDE_CODE_CREDENTIALS_PATH prevented every ClaudeChatModel from ever reaching ~/.claude/.credentials.json; the source is now skipped with a debug log like its sibling guards. (#5591)

• skills: Render an explicit empty allowed-tools as no tools. The skill metadata renderer truthiness-tested the field, so a skill declaring allowed-tools: [] advertised Allowed tools: (all) while the tool policy stripped every business tool — the model planned against tools that would be rejected. The empty declaration now renders (none); an omitted or non-empty declaration renders as before. (#5593)

• gateway: Classify the Windows image/svg MIME alias as active content. On Windows the MIME database maps .svg to image/svg rather than the standard image/svg+xml, and the shared active-content classifier only recognized the standard type, so SVG artifacts, .skill archive members, and project documents could be served inline instead of forced to download. The alias is now treated as active content on every host. (#5594)

• models: Tolerate a null Codex account_id before it reaches the request header. or-chaining let a JSON null survive the loader as None, so CodexChatModel construction crashed on self._account_id[:8]; a numeric account_id died later with httpx rejecting a non-string ChatGPT-Account-ID header. Null now falls back to the unknown-account value "" and any other non-string is stringified. (#5601)

• llm: Fence circuit-breaker probe settlement by generation and ownership. LLMErrorHandlingMiddleware settled successes and failures unconditionally, so a request admitted under an older closed generation could finish after a newer recovery probe was acquired and then close the circuit during the outage, reopen it and discard a healthy probe, or release another call's probe. Every admission now captures the circuit generation, and success, failure, or release only mutates the breaker when both the generation and — in half-open state — the exact probe token match. (#5602)

• memory: Reject a Honcho base_url that can never resolve. The field was read with no validation, so the natural scheme-less spelling for an internal host (base_url: honcho:8000) was accepted at startup — httpx parses the host as the scheme — and memory then failed on every operation with an unsupported-protocol error, or silently returned empty results while the Gateway ran green; the api_key-over-plain-HTTP guard was skipped too, since it matched only a literal http:// prefix. Malformed values now fail fast at Gateway startup, matching the documented behavior, and every URL that resolves today keeps working. (#5607)

• subagents: Report an explicit zero batch limit by name instead of defaulting it. SubagentBatchService.submit() resolved max_live_items / max_running_items with or, so a caller-supplied 0 read as "not supplied" and was silently replaced with the configured default — a batch_task asking for zero concurrent items ran three at a time — and paired with a small max_live_items, the request was refused for a limit it did not violate. Both resolutions now compare against None, so an explicit 0 reaches the range guard and is rejected by name; an absent key still means "use the configured default". (#5609)

• sandbox: Drop ignored directories from remote list_dir output. A local sandbox skips node_modules, .git and the other ignore patterns, but the same call in a remote sandbox listed every path under them up to the 500-line cap, even though the remote grep and glob already treat those paths as invisible. The shared remote parser now drops entries containing an ignored directory name, matched relative to the listing root like the local walk: explicitly listing an ignored directory still works, and a fully ignored directory returns empty instead of FileNotFoundError. (#5612)

• middleware: Discard stale todo reminders during context compaction. After a todo reminder had been injected, compaction could summarize its old task statuses or keep the stale reminder in the retained message tail, which also stopped TodoMiddleware from rebuilding task context from the current todos state. Automatic and manual compaction now exclude todo_reminder snapshots before selecting the summary and retained partitions, and the current todo state survives: the middleware regenerates a reminder before the next model call when no write_todos call remains visible. (#5614)

• sandbox: Honor start_line/end_line in Tenki's read_file. The Tenki provider accepted only path, so a ranged read — the normal way an agent continues a truncated read — raised TypeError: ... unexpected keyword argument 'start_line', rendered as a generic read error. It now slices like the sibling providers, with negative bounds clamping the way the local sandbox does. (#5616)

• persistence: Drain the PostgreSQL schema bootstrap connection close across cancellation. ensure_postgres_schema_async() closed its dedicated psycopg connection with a bare await, so cancellation arriving during lifespan teardown could abort the close and return while the connection was still live. The close now goes through the cancellation-safe await_drained() helper, which defers the caller's cancellation until the owned connection finishes closing. (#5617)

• runtime: Drain runtime provider teardown across cancellation. The checkpoint-cache and stream-bridge provider context managers own their backends and awaited aclose()/close() directly on context exit, so host cancellation arriving mid-teardown could abort the close and return while a memory or Redis backend was still live. Both closes now go through the cancellation-safe await_drained() helper for the memory and Redis backends; cancellation propagates only after the owned close finishes. (#5622)

• helm: Align the provisioner's state root with the Gateway's when the shared home PVC is enabled. The chart set the Gateway's DEER_FLOW_HOST_BASE_DIR but left the provisioner on its runtime default /.deer-flow, so valid Gateway skill-projection paths fell outside the provisioner's allowed base and could be rejected before sandbox creation in USERDATA_PVC_NAME mode. The provisioner now receives the same logical root so projections map to deer-flow/<suffix> on the PVC; it stays unset when persistence.home.enabled=false. (#5625)

• client: Honor an agent's MCP plugin selections in the embedded client. An agent saved with mcp_plugins: [installation-A] still received tools from every enabled MCP server through DeerFlowClient, an empty selection was ignored as well, and delegated tasks did not inherit the agent's selection. The client now applies the saved selection when loading tools and passes it to delegated tasks on every run, including cached-graph runs; the selection joins the graph cache key as an unordered set, and saved configuration changes still take effect after reset_agent(). (#5630)

• persistence: Drain Alembic migration workers across cancellation. bootstrap_schema() held the SQLite in-process mutex or the PostgreSQL advisory lock while stamp/upgrade ran in asyncio.to_thread(), but those awaits were cancellation-vulnerable: cancelling the host task could return from the bootstrap critical section while the worker was still mutating schema state, letting a second bootstrap overlap a live migration. Every Alembic worker await now goes through the cancellation-safe await_drained() helper; cancellation propagates only after the worker finishes. (#5631)

• sandbox: Enforce command timeouts in the AIO sandbox. AioSandbox ignored the caller-provided timeout, so sandbox.bash_command_timeout never applied — a long-running command ran to completion, and a stalled persistent-shell request kept the sandbox-wide serialization lock occupied, blocking later operations on the same client. Commands now carry a server-side hard_timeout on supported AIO images (the frozen legacy :latest gets a bounded host wait only), ambiguous outcomes are never replayed, and sandbox.bash_command_timeout is now the provider default. (#5634)

• channels: Log Slack Socket Mode connect failures instead of dropping them. SlackChannel.start() ran SocketModeClient.connect() through run_in_executor() and discarded the returned future, so a rejected app_token (or unreachable Slack) left the bot silently dead — the log said Slack channel started and the exception surfaced only as asyncio's "Future exception was never retrieved" at garbage-collection time. Connect failures are now logged with their traceback, matching what the Telegram and Discord channels already did. (#5640)

• mcp: Honor a stdio MCP server's configured cwd. McpServerConfig accepted the setting as an extra field, but build_server_params() dropped it before either launch path saw it, so a server configured with a working directory could fail discovery when its script path was relative, or discover with an absolute path and then fail relative file reads during pooled tool calls. The directory is now forwarded to stdio connections when non-empty (including environment-variable references) and omitted for HTTP/SSE; omitted, null, or empty values keep the default behavior. (#5643)

• skills: Read Python secret assignments from the AST in SkillScan. The secret-env-assignment rule swept every text file with a name[:=]value regex, which misreads Python: a typed-optional parameter default (token: Optional[str] = None) and api_key = os.getenv("...") — the rule's own documented remediation — were both reported as hardcoded credentials, failing the review gate on unchanged bundled skills. Python sources are now analyzed from their AST, reporting only real literal values; non-Python coverage is unchanged, and a test pins the bundled skills stay clean. (#5648)

• persistence: Drain the database auto-create maintenance dispose across cancellation. _auto_create_postgres_db() released its throwaway engine with a bare await maint_engine.dispose(), so cancellation during a slow first boot could abort the dispose and leave one live server session against postgres for the lifetime of the process — a leak that is not self-healing, since the next boot takes the non-missing-database path and never retries the disposal. The dispose now goes through the cancellation-safe await_drained() helper; a successful first boot behaves as before. (#5649)

• skills: Keep per-user skill-install directory setup off the event loop. UserScopedSkillStorage.ainstall_skill_from_archive created the per-user custom directory with a blocking os.mkdir on the loop before any real work was dispatched, so POST /api/skills/install stalled the Gateway event loop; the existing blocking-IO anchor missed it because it covered only the host-scoped base class. The mkdir now runs on the worker thread like the extraction and validation around it, and the anchor covers the user-scoped path. Install semantics and on-disk layout are unchanged. (#5650)

• sandbox: Clamp negative read_file range bounds in the e2b, OpenSandbox, and BoxLite providers the way LocalSandbox already does. Negative values previously fell through to Python negative-index slicing, so start_line=-1 silently returned the last lines of a file and end_line=-1 a truncated range instead of reading from the first line and yielding an empty range. The tool layer already rejected negative bounds; direct Sandbox consumers hit the gap. (#5655)

• skills: Align the bundled Vercel deploy skill's package directory with its declared name and point its deployment commands at the real mounted path /mnt/skills/public/vercel-deploy/scripts/deploy.sh. The skill lived in vercel-deploy-claimable while activating as /vercel-deploy, and its instructions referenced a script path DeerFlow never mounts, so a deployment request could select the correct skill and still receive a command pointing at a file that does not exist. (#5656)

• frontend: Show explicit empty skill export requirements instead of a blank value. The export dialog formatted allowed-tools and required-secrets with join(", "), so an explicitly empty declaration rendered as an empty string and was indistinguishable from an omitted one, even though the two have different policy semantics; absent declarations now render as "Not declared" and explicitly empty ones as a localized "None". (#5659)

• sandbox: Bound AIO list_dir with a dedicated directory deadline. The listing ran under the sandbox-wide lock with only a 600-second no-change timeout and inherited the SDK transport budget, so a stalled relay or wedged find could block later operations on the same sandbox for minutes. On supported images the remote find now carries a 60-second server-side hard_timeout inside a 65-second no-retry host envelope: hard_timeout raises TimeoutError and keeps the shell generation reusable, ambiguous outcomes raise OSError and fence it. No new configuration. (#5662)

• runtime: Share one change position across an atomic thread operation in the memory run store. create_thread_operation_atomic advanced the change clock per row, so an interrupt-and-replace landed its interrupted row and replacement on two change_seq values and a list_changed reader paging by (change_seq, run_id) could observe half of the atomic set; every claimed row and the new row now carry one position, matching the SQL store. The default (no durable database) deployment selects this store. (#5663)

• runtime: Drain synchronous checkpoint mutations across cancellation. Goal writes and rollback offload sync checkpointers with asyncio.to_thread(), and cancelling the caller previously stopped waiting while the put, put_writes, or delete_thread worker kept running — the caller could observe cancellation and the mutation could still commit afterwards. These fallbacks now drain through the cancellation-safe await_drained() helper; the read fallback get_tuple stays directly cancellable. (#5664)

• agent: Distinguish undeclared and explicitly empty skill allowed-tools in the agent assembly fingerprint. Both declaration states hashed to an empty list, so switching a skill from the legacy allow-all to a no-business-tools policy changed runtime tool availability without changing the fingerprint; undeclared allowed_tools now hashes as None while explicit allowlists stay sorted lists. Frontmatter parsing and runtime tool policy are unchanged. (#5669)

• uploads: Stop deleting a converted Markdown companion when its document is deleted. delete_file_safe recomputed stem.md, so two documents sharing a stem (a.docx, a.pdf) made deleting one document remove the other's converted text — or destroy a user's own report.md next to an unrelated report.pdf. DELETE /api/threads/{id}/uploads/{filename} now removes only the requested file; orphaned companions stay in the listing and can be deleted individually. No API shape or config change. (#5673)

• sandbox: Prune ignored entries before applying the remote ls listing limit. The 500-entry cap was applied before ignored paths were dropped, so a dependency tree could fill the entire window and hide a normal file beside it, sometimes leaving only the root in the returned listing; ignored descendants are now pruned inside the shared find command before head, preserving depth and output limits. (#5676)

• persistence: Apply database.postgres_schema to the synchronous SQLAlchemy store used by DB-backed custom agents and managed subagents. The async ORM and LangGraph stores already honored the configured schema, but synchronous agent-store queries fell back to public and failed to find the application tables; the connection URL now preserves existing libpq options while adding search_path. (#5678)

• logging: Collapse every non-absolute Redirecting slot to /<redacted>. The #5225 URL-redaction pass kept a slot verbatim unless it started with /, so slash-less relative Location references (download?sign=…), query-only, fragment-only, network-path, and data: targets rendered their signed queries verbatim in DEBUG redirect logs; only a target with a scheme at position 0 is now handed to the generic absolute-URL pass, and non-URL -> /path sandbox mount arrows still pass through. (#5680)

• channels: Log DingTalk inbound-file skips instead of dropping the attachment silently. A download that returned no content vanished with zero log lines, indistinguishable from a message that never had one; the skip now emits a neutral guard line naming the file, matching the WeChat channel's shape, with the accurate reason already logged inside the download helper. No behavior change. (#5683)

• gateway: Drain readiness-probe connection close across cancellation. /health/ready closed its SQLite and PostgreSQL probe connections with a bare await connection.close(), so a second cancellation during teardown could interrupt it and let the probe return while its connection was still live, detaching database cleanup from the request lifecycle; close now drains through the cancellation-safe await_drained() helper. Response shape is unchanged. (#5684)

• logging: Collapse space-carrying Redirecting slots to /<redacted>. Round 15 kept scheme-bearing slots verbatim for the generic absolute-URL pass, but that pass's pattern stops at whitespace, so a slot like https://mirror.example/other page?sig=… rewrote only the text before the space and leaked the rest into DEBUG logs; a slot is now kept only when a whitespace-free absolute URL fills it, and ordinary absolute redirect pairs still keep their host. (#5687)

• skills: SkillScan's secret-env-assignment rule again reports secrets bound outside plain statement assignments. The AST walk from #5648 only saw bare-constant assignments, so keyword arguments (connect(api_key="...")), parameter defaults, walrus bindings, literal concatenation, and all-constant f-strings hid a hardcoded credential from the HIGH-severity gate. The constant fold is iterative: a recursive one could raise RecursionError, which the scanner records as a per-file error that drops every finding for the file. The #5648 precision (annotations, os.getenv calls) is preserved. (#5691)

• community: Browserless web_fetch now reads its documented wait settings the way web_capture does. wait_for_timeout_ms goes through the tolerant _as_int helper, so a value like 2s falls back to the default instead of failing the call with invalid literal for int(), and wait_for_selector_timeout_ms is read from tool config instead of a hardcoded 5000 (default unchanged, so existing configs behave the same). Both keys are now documented on the web_fetch entry in config.example.yaml. (#5702)

• community: SearXNG max_results above one page is now honored. The SearXNG API has no limit parameter, so the client sent an ignored limit, requested only page 1, and sliced an already-truncated list — max_results: 20 silently returned one page (10 by default). search now walks pageno and accumulates results until the cap is reached, a page comes back empty, or a page adds nothing new (deduped by URL), capped at 5 pages; the dead limit parameter is no longer sent. Default max_results still costs one request. (#5705)

• sandbox: Ambiguous AIO session creation can no longer be replayed or executed. Shell and bash creation planes track each attempted id through a pending/owned/absent/tombstoned state machine: timeouts, transport errors, 5xx responses, and malformed HTTP-200 responses tombstone the id — no execution on it, no replayed create, bounded best-effort cleanup that never clears the tombstone — and new creates on that plane are blocked. A dirty sandbox is released through the existing teardown path instead of returning to the warm pool; shell ambiguity does not affect bash creation. (#5711)

• models: Official DeepSeek models added through Settings now use the native PatchedChatDeepSeek adapter. Managed profiles and their connection probes always built ChatOpenAI, so adding deepseek-flash failed the connection test with HTTP 400 Thinking mode does not support this tool_choice, and streamed tool calls dropped reasoning_content and sent max_completion_tokens instead of DeepSeek's native max_tokens. Thinking is disabled only for the bounded forced-tool probe — normal chat settings are untouched — and matching is limited to api.deepseek.com, so third-party compatible endpoints keep their behavior. Existing saved profiles gain the adapter without a catalog migration. (#5718)

• community: Browserless web_fetch now reads reject_resource_types and reject_request_pattern from its tool config. Both parameters were declared and passed to the client but only ever assigned None, so a configured value was silently ignored and resource-type/request-pattern rejection — the main lever for render latency and bandwidth against a self-hosted Browserless — could not be turned on. Values accept a YAML list or a comma-separated string; unusable values omit the parameter instead of sending it. Defaults are unchanged, and both keys are documented in config.example.yaml. (#5719)

• skills: The custom-skill rollback route no longer reads the skill's edit history on the event loop. POST /api/skills/custom/{skill_name}/rollback constructed the storage, probed existence, and parsed custom/.history/<name>.jsonl inline, and each history entry carries the full previous and new skill contents, so a rollback stalled every other run and stream on the worker for the parse. The work now runs on a worker thread, matching the adjacent history handler; status codes and response shapes are unchanged, and blocking-IO anchors guard the route. (#5729)

• mcp: Durable MCP task calls now bound connection setup and MCP initialization under the same session_init_timeout deadline as session entry. The timeout previously started only after entering the session context, so an SSE server that accepted HTTP but never sent the MCP endpoint event kept the call waiting indefinitely. After initialization succeeds the deadline is disabled and the existing independent tool-call timeout applies; None still disables the initialization bound. (#5733)

• skills: required-secrets[].optional must now be a YAML boolean. A quoted value like optional: "false" passed frontmatter validation and was later parsed with Python truthiness, so bool("false") recorded a required secret as optional and produced wrong missing-secret diagnostics and exported requirement metadata. Validation rejects non-boolean values, and the runtime parser fails closed to optional=False with a warning (value type and secret name only) for mounted or historical skills. The skill-review analyzer flags the shape as structure.invalid-required-secrets-optional. (#5738)

• skills: Skill review no longer keeps sentence punctuation on extracted resource references. A bare path at the end of a sentence ("See references/setup.md.") was extracted with its trailing period, producing a false resource.missing finding and a spurious orphan for the real file. Extracted references now strip trailing ., ?, and !, while real dotted filenames such as references/config.yaml and link targets like references/v1.0.md stay intact. (#5739)

• uploads: Remove a staged upload's .part only after its document-conversion descriptor is released. With uploads.auto_convert_documents enabled, commit unlinked the staged file while conversion still held an open descriptor, so on Windows every convertible upload (PDF/DOCX/PPTX/XLSX) failed with WinError 32 (500) where POSIX silently allowed it. The staged name is now removed in the same cleanup that releases the descriptor, and abort-path cleanup is best-effort so a secondary removal failure can no longer mask the original error. (#5740)

• composer: Keep IME-composition Enter out of the slash-skill catalog. The main prompt textarea's suggestion handler lacked the isIMEComposing guard its sibling call sites had, so with an IME active and the / catalog open, the Enter that committed a CJK composition instead applied the highlighted skill and discarded the in-progress text. IME-consumed keydowns now fall through to the normal submit path; plain Enter still selects the highlighted skill. (#5741)

• sandbox: Cancel BoxLite loop work whose synchronous bridge wait timed out. run_coroutine_threadsafe(...).result(timeout) raised to the caller but left the submitted coroutine running on the private loop, so the sandbox could keep mutating or retain acquire ownership after the operation was reported as timed out; the pending future is now cancelled before the timeout re-raises, while already-completed futures are left alone. (#5748)

• mcp: Invalidate the MCP tool cache only when the effective MCP configuration changes. Invalidation previously keyed on the whole extensions_config.json signature, so toggling an unrelated skill rebuilt cached tools and retired every pooled stdio session. The cache now compares a snapshot of the enabled servers' parsed settings (declaration order) and global mcpInterceptors before retiring anything; when no servers are enabled, a non-initializing refresh retires stale state without adding discovery overhead, and malformed-config error logging no longer emits resolved credentials. (#5750)

• gateway: Drain artifact updates to completion across request cancellation. Cancelling PUT /api/threads/{thread_id}/artifacts/{path} unwound the thread-operation reservation and sandbox lease while the non-mounted remote sync was still mutating the sandbox, leaving the remote and host copies at different bytes and letting later work overlap the abandoned mutation. The full remote-sync/local-replace transaction is now drained before ownership is released, with rollback semantics preserved and the primary commit failure logged before rollback. (#5755)

• uploads: Preserve the original link error when staged-upload cleanup fails. On a failed link commit whose conversion descriptor was still open, Windows rejected the error handler's unlink with a sharing violation and that secondary error replaced the real endpoint error; the generic link-failure path now respects unlink_staged=False and all staged cleanup is best-effort. A cleanup failure after a successful link also no longer returns 500 for an already-published destination. (#5756)

• runtime: Drain database provider context exits across caller cancellation. The async SQLite/PostgreSQL checkpointer and Store providers used raw async with, so a cancellation delivered while the backend's __aexit__() was blocked cancelled the teardown itself and let the provider finish with incomplete database/pool cleanup — deterministically across all six provider paths. A drained_async_context() helper now preserves exception and suppression semantics while draining the exit to completion. (#5757)

• channels: Resolve the Buzz seen-event store path off the event loop. ChannelService._start_channel built the default seen_event_store_path inline, dereferencing Paths.base_dir (a realpath) on the loop in a path reachable from POST /api/channels/{name}/restart; the resolution now runs in a worker thread, with a blocking-IO anchor pinning it to the strict gate. (#5759)

• sandbox: Resolve the AIO sandbox acquire lock path off the event loop. _discover_or_create_with_lock_async offloaded every acquire step except the inline lock-file path construction, which dereferences Paths.base_dir (a realpath) on the loop on the hot path of every sandboxed tool call; the resolution now joins the surrounding steps in a worker thread, and the sibling ownership-publish anchor exercises the production path layer again. (#5760)

• threads: Do not leave orphan threads behind when a LangGraph run is rejected. Standalone run admission pre-creates a missing thread before LangGraph re-checks assistant ownership, so a run against another user's non-system assistant returned the expected 404 but had already persisted an idle thread owned by the caller. Admission now verifies the assistant's server-owned provenance before Threads.put (with the ambient auth context temporarily cleared), while ordinary users can still implicitly create threads for registered system assistants. (#5762)

• setup: Run the pre-commit hook through uv so make install no longer fails when uv's tool bin directory is not on PATH, and make the Node.js prerequisite check actionable: nvm users get an install command and everyone else a link to the official download page. (#5767)

• scheduler: Read the dispatch lease owner under SQLite's writer lock. release_dispatch_lease was the only mutating path that skipped _lock_task, and because FOR UPDATE is ignored on SQLite its guard evaluated a stale snapshot: a pause landing inside the dispatch window could be overwritten, leaving the task enabled and firing again even though the API had confirmed the pause. The read now takes the writer lock first; PostgreSQL behavior is unchanged. (#5777)

• utils: Initialize Article.url so to_message() no longer raises AttributeError for pages containing images. ReadabilityExtractor never passed the page URL into Article, so resolving a relative image URL via urljoin(self.url, …) crashed; the attribute now defaults to "" and the extractor passes the real URL. (#5785)

• tools: Coerce DDG web-search result limits from environment variables. max_results: $DDG_MAX_RESULTS kept the substituted string, and DDGS 9.14.1 raised a TypeError sizing its workers that the search wrapper reported as No results found for every query. Configured limits now accept numeric strings; invalid or non-positive values log a warning and fall back to the default of 5, while integer configs, the default, and config-over-call precedence are unchanged. (#5792)

• gateway: Treat a blank GATEWAY_HOST or GATEWAY_PORT as unset. A compose file with GATEWAY_PORT= (or GATEWAY_PORT=${PORT} with PORT unset) handed an empty string to int(), killing the Gateway at import time before uvicorn could bind. Blank values now fall back to the declared defaults (0.0.0.0 / 8001); GATEWAY_PORT=0 still asks the OS for a free port, and every non-empty value parses exactly as before. (#5801)

• channels: Persist channel runtime configuration as UTF-8. The store read its JSON as UTF-8 but wrote its temporary file with the host's default encoding and ensure_ascii=False, so on non-UTF-8 hosts (CP1252, GBK) non-ASCII values — such as a configured Buzz relay URL — could fail to save or be written in bytes the store could not read back. The temporary write now specifies UTF-8; atomic replace, locking, and chmod behavior are unchanged, and legacy-encoded files are not migrated. (#5803)

• setup: Accept successful Apple Container image pulls in make setup-sandbox. On macOS with Apple Container installed and Docker absent, the script fell through to the Docker availability check and exited 1 with "Neither Docker nor Apple Container is available" after the image had already been pulled. An Apple-only pull now counts as success and continues to the default-image note; Docker behavior, including fallback after an Apple Container failure, is unchanged. (#5804)

• runtime: Keep agent stream teardown alive across repeated cancellation. close_agent_stream() awaited stream.aclose() in the caller task, so a second Task.cancel() during teardown cancelled the close itself and let callers abandon releasing graph, provider, sandbox, and tool resources; a close-originated CancelledError also made a broken close look interrupted instead of failed. The close now runs in a dedicated shielded task, the first caller cancellation is deferred until it completes, and stream-originated close cancellation is reported as a close failure so the run terminalizes as failed. (#5806)

• tools: Apply the #5792 numeric-string coercion to DDG image search. image_search_tool passed the environment-substituted max_results string straight to DDGS, which raised a TypeError sizing its workers, so max_results: $IMAGE_MAX_RESULTS made every query return No images found; 0 removed the limit and negative values truncated results. Numeric strings now work, and invalid, zero, or negative values warn and fall back to 5, with integer configs and the default unchanged. (#5807)

• client: Stop resumed embedded-client streams from replaying prior turns. On a resumed thread, DeerFlowClient.stream() re-emitted earlier turns' message deltas — including tool results — in messages-tuple events and counted their tokens in end.usage, overstating per-turn usage. Historical messages stay in values full-state snapshots but are suppressed from the current turn's deltas and usage, with the per-run run_id on the current user message as the boundary; Gateway SSE is unchanged. (#5811)

• persistence: Drain the postgres schema-setup connection exit across cancellation. _ensure_postgres_schema_with_pool still acquired its connection with a raw async with, so caller cancellation landing while the connection's __aexit__ was blocked interrupted the exit and the connection was never returned to the pool, whose drained teardown then closed with a checked-out connection. The connection now goes through drained_async_context() like the rest of the checkpointer provider; no happy-path behavior change. (#5812)

• mcp: Stop the bare-filename correlation pass from mangling backslash paths. After a stdio MCP call created page.yml, a result mentioning C:\outside\page.yml had its basename rewritten to point at the new workspace file, because the pass treated a backslash as a bare-filename boundary. Backslashes now act as path separators on both sides of a correlated name, so genuine bare filenames still resolve while names inside unresolved Windows, UNC, or relative paths stay unchanged. (#5815)

• mcp: Resolve generated file paths containing spaces in MCP text results. A file named artifact with space.txt kept its absolute host path in the free-text tool result, and a follow-up read_file failed with Permission denied because whitespace hid the complete filename from the token matcher. Whitespace-containing absolute and workspace-relative paths now correlate with files the call created, validated inside the current thread's user-data tree; outside paths and ambiguous suffixes are untouched. (#5819)

• middleware: Preserve human message metadata in ThreadDataMiddleware. Adding run metadata reconstructed the last HumanMessage from parts, silently dropping fields it did not copy such as response_metadata; the middleware now copies the existing message and updates only its default name and additional_kwargs. (#5823)

• uploads: Keep document-conversion stat() and markdown write-back off the event loop. convert_file_to_markdown offloaded the conversion itself but still ran the size-check stat() and the multi-megabyte write_text of the converted markdown on the loop, blocking upload ingestion for large documents. Both now go through the shared run_file_io pool; the small-file inline conversion threshold is unchanged. (#5830)

• mcp: Run lazy MCP tool discovery once when initialization itself raises. The no-event-loop except RuntimeError fallback in get_cached_mcp_tools() also caught discovery's own errors: with no running loop a failing call spawned every stdio server and re-fetched OAuth tokens twice — repeated on every later call, since a failed init never marks the cache initialized — and inside a running loop the log buried the real cause under "asyncio.run() cannot be called from a running event loop". Initialization is now driven exactly once with the real failure logged; errors still return [] and leave the cache uninitialized for the next retry. (#5836)

• config: Honor $VAR substitution for request_admission integer fields. requests_per_minute and max_queue_size are declared strict=True so true and 60.0 stay rejected, but an environment substitution like requests_per_minute: $RPM arrived as the string "60" and failed the whole config.yaml load with int_type — quotas kept in the environment could not pace a model at all. A BeforeValidator now converts a plain decimal string to int before the strict check; bools, floats, "60.0", empty and non-numeric values are still rejected and gt=0 is unchanged. (#5838)

• tools: Coerce Exa's configured result limits before calling the SDK. $VAR substitution resolves to strings, so max_results: $EXA_MAX_RESULTS made every web_search call fail — exa-py rejects a string num_results — and contents_max_characters went out as "maxCharacters": "1000". Both are now parsed as integers (a non-boolean integer or integer-form string only); a blank, non-numeric, fractional, boolean, zero or negative value logs a warning and falls back to the defaults (5 and 1000) instead of failing the search, matching the DDG and SearXNG providers. (#5839)

• gateway: Treat a blank GATEWAY_WORKERS and blank Lark broker port or timeout as unset, extending #5801's blank-env rule. int("") in the WeChat QR-login guard turned a blank GATEWAY_WORKERS (e.g. -e GATEWAY_WORKERS=) into a 503 "requires a single Gateway worker" on every QR route even though the Gateway runs one worker, and a blank DEERFLOW_LARK_BROKER_PORT/_TIMEOUT aborted the Lark broker at startup. The guard now reads GATEWAY_WORKERS or WEB_CONCURRENCY or "1" and still fails closed on multi-worker or non-numeric values; the broker falls back to its defaults. (#5840)

• skills: Strip section anchors from code-span resource references in the skill review resource graph. Markdown-link targets already dropped #fragment before resolving, but a code-span reference like references/faq.md#pricing kept the anchor, resolved as a literal path, and raised a false resource.missing warning even though the file exists and is referenced. Code-span tokens now split the fragment the same way and strip trailing sentence punctuation; dotted filenames such as references/v1.0.md#notes keep their extension dots. (#5841)

• skills: Keep the skill review markdown-link scan linear on adversarial input. The extractor re-scanned the same target run from every candidate opener, so a long run of unmatched [ or a ](-dense invalid target drove the review quadratic — #5714 measured 19 s on 256 KiB of [, and the resource graph scans every text member with PackageLimits.max_file_bytes at 64 MiB, so a single large SKILL.md is squarely in scope. The scan now walks candidate openers once, reproducing finditer exactly (verified by differential fuzzing against the base regex), and blanks matched spans by position instead of str.replace, which could blank an unrelated later copy of the same text. (#5884)

• config: Sign the bytes the config cache parsed, not a second read. The app-config loader opened config.yaml twice — parse once, then hash a fresh read to record the (mtime, size, sha256) signature — so a write landing between the two reads cached the older content under the newer signature and get_app_config() never reloaded it, silently serving a stale config until some later edit. The loader now reads once through a shared file_signature.read_config_with_signature() helper that signs exactly the returned bytes; a racing edit can only cost one extra reload. (#5848)

• dev: make stop / make dev can now reclaim dev ports held by a sibling worktree whose path contains spaces. serve.sh built its worktree-root list with awk '{print $2}' over git worktree list --porcelain, whose paths are unquoted, so .../deer flow two was recorded as .../deer; a Gateway or frontend started from that worktree was never recognised as deer-flow's and the start aborted with "port already in use". The whole path is kept now. (#5856)

• uploads: A malformed files[*].size in a run's message metadata no longer fails the whole run. UploadsMiddleware validated every other field of a client-supplied file entry fail-soft but passed size straight to int(), so a value such as "abc" or a list raised out of before_agent before the model was called — and again on every edit or regenerate of that message, since the entry is carried over verbatim. The size only feeds the human-readable line in <current_uploads>; unusable values now fall back to 0, the same as a missing size, while numeric strings keep working. (#5855)

• release: Bumping the version no longer leaves backend/uv.lock behind. scripts/bump_version.sh rewrote backend/pyproject.toml, frontend/package.json and the Helm chart, but the lockfile records the root package's own version too (uv keeps its PEP 440 form, so 2.1.0-rc0 is stored as 2.1.0rc0). The documented release step therefore produced a commit whose lock CI rejects: uv lock --check fails on the stale lock and uv sync --locked refuses the tree, and with pre-commit installed it broke a step earlier on the uv-lock-check hook. The script now refreshes the lock with uv lock and exits before editing anything when uv is missing, instead of leaving a half-bumped working tree behind. Only the root package's version line moves. (#5859)

• sandbox: The temporary sandbox lease acquired by the HTTP upload route is now released. In remote/provisioner deployments, POST /api/threads/{id}/uploads temporarily acquires the thread sandbox to sync uploaded files into non-mounted sandboxes, but the lease was never released — not on success, 413, or failure — and Feishu file sync held the same non-releasing pattern, so the acquired sandbox (a Pod plus NodePort Service) never returned to the warm pool. Both paths release after sync, and a release only parks the sandbox in the warm pool once the last holder exits: when the same thread already has an active run sandbox, releasing the temporary lease just decrements it instead of parking the sandbox in use. (#3261)

• frontend: Stop retrying the initial run-creation request after an ambiguous failure. The LangGraph SDK retries failed HTTP requests by default, and POST /runs/stream is not idempotent: an intermediary could return an ambiguous gateway error such as 504 after the backend accepted the request, and the retry then created the same run twice, duplicating user-visible work. Run creation is now issued with retries disabled, while reads, explicit stream joins, and SSE recovery — the GET to the server-provided Location carrying the Last-Event-ID cursor — keep their normal retry behavior. (#4725)

• gateway: A stream-bridge failure no longer cancels a healthy run as if the client had disconnected. Both creator-side consumers — the SSE POST /runs/stream response and POST /wait — applied the creator's on_disconnect policy (cancel) from an unconditional finally, so any exit from StreamBridge.subscribe(), including an infrastructure exception or the subscription exhausting before a terminal event, was treated as a client disconnect and could cancel a running agent. The policy now applies only to observed disconnects (request.is_disconnected(), SSE generator close, request-task cancellation); bridge exceptions propagate without cancelling the run, and premature subscription exhaustion raises a server error. (#5623)

• logging: Redact credential-bearing header values from urllib3's "Failed to parse headers" warning. The dump carries the raw header block following the first malformed line, and UrlRedactionFilter had no pass shaped for it, so Set-Cookie/Authorization/WWW-Authenticate/Location values reached the log whole — twice, since the exc_info traceback repeats them. New passes, gated on urllib3's own literals, split the dump on its logical breaks and collapse only credential-bearing field values, keeping field names and non-sensitive fields so the record still says what failed; the exception text runs the same passes via exc_text, which JsonTraceFormatter now honors instead of re-rendering exceptions itself (logging.enhance.format=json previously kept leaking). (#5752)

• uploads: The link-failure cleanup arm in the upload staging helper (_link_staged_no_overwrite) no longer removes a staged name its caller still owns. The arm did a hard os.unlink() tolerating only FileNotFoundError; on the conversion path (unlink_staged=False) the caller keeps a descriptor on the staged inode, so on Windows the removal raised PermissionError, which replaced the original os.link failure the caller needs to see and left the .part behind. The arm now removes the staged name only when this call owns it, through the best-effort _remove_staged_file, so a removal failure can never mask the link error; with unlink_staged=False the caller cleans up via _abort_upload_temp. (#5763)

• events: A cancelled JSONL snapshot no longer releases the per-thread lock while its file scan is still running. find_latest_ai_message_run_ids() takes the per-thread write lock for one complete thread-log read, but the scan ran through a bare await asyncio.to_thread(...): cancelling the caller cancelled only the awaiter, so the lock was released while _read_thread_events() was still reading files and a writer could enter mid-snapshot. The scan now drains through the _await_owned_task() helper (task name jsonl-snapshot:{thread_id}); the first caller CancelledError stays primary and a read failure is chained as its cause. (#5795)

• sandbox: Hold the AIO cross-process flock until its lifecycle worker settles, even when the caller is cancelled. _discover_or_create_with_lock_async() dispatched discovery, registration and creation through bare asyncio.to_thread(); cancelling the caller released the flock while a worker was still mutating the sandbox lifecycle, letting another process enter the same discover/create critical section. Sync steps under the lock now drain through run_sync_lifecycle_operation(), the whole async create runs inside await_drained() so a created sandbox still reaches readiness and registration, and the flock is retried with cancellable non-blocking attempts so a cancelled waiter exits promptly. (#5820)

• helm: The chart now plumbs the optional lark-cli sandbox runtime images into the provisioner. The provisioner reads LARK_CLI_INIT_IMAGE and LARK_CLI_BROKER_IMAGE and Compose and the root README document them, but the chart had no corresponding value, so an operator following the README had nothing to set and the sandbox silently launched without lark-cli, failing only later with command not found inside the sandbox. New values provisioner.larkCliInitImage and provisioner.larkCliBrokerImage (broker supersedes init) render the matching env var on the provisioner Deployment only when set; unset, they are omitted entirely so existing releases render an unchanged Pod spec. (#5835)

• tenki: A Tenki sticky setting supplied through an environment reference (e.g. sandbox.sticky: $TENKI_STICKY with TENKI_STICKY=false) no longer enables host pinning. Environment substitution leaves this provider-specific field a string, and the previous bool(...) conversion counted any non-empty string — false, 0, off, no — as True, so the provider asked Client.create for sticky sandboxes the operator had disabled. Values are now parsed with Pydantic's boolean validator: case-insensitive false/0/off/no disable pinning, true/1/on/yes enable it, omitted or null stays disabled, native YAML booleans are unchanged, and an invalid value fails provider initialization. (#5849)

• config: stream_bridge.recovered_stream_cleanup_delay_seconds now rejects booleans, non-finite values, and anything above 86400 at load time, like its guarded sibling heartbeat_interval_seconds. The field only carried ge=0, so a hand-edited config.yaml with …: true was silently coerced to 1.0 — collapsing the reconnect grace window to one second — and …: .inf or 1e30 was accepted as-is, making the post-END cleanup task sleep forever and keeping an orphaned run's Redis stream until the rolling stream_ttl_seconds (default 86400) expired it instead of the configured grace delay. 0 stays valid ("delete as soon as END is published") and the documented default of 60 is unchanged. (#5850)

• community: DDG web_search now warns and falls back to the default of 5 results when max_results in config.yaml is a boolean or a fractional number, as the README already documents and as image_search has done since #5807. web_search's _coerce_max_results went straight through int(), which truncates 3.5 to 3 and counts true as 1, so the tool quietly narrowed its result set instead of flagging the invalid value. Integral floats such as 4.0 and numeric strings keep their behavior. (#5852)

• llm: strip_think_blocks() no longer slows quadratically on model text with many unclosed <think> tags. The helper cleans model text used by goal evaluation, suggestions and input polishing, and its complete-block regex retried the remaining suffix at every opening tag, so 12,000 repeated <think> tags took about 3.1 seconds with the cost still growing. It now scans opening and closing tags forward in one pass, consuming each matched block once and stopping at the first unclosed opening tag; case-insensitive matching, opening-tag attributes, whitespace before the closing >, and both truncate_unclosed modes are unchanged. (#5854)

• sandbox: ls /mnt/skills no longer fails with "Directory not found" when only category mounts exist. In the default skills projection the provider mounts /mnt/skills/public, custom, legacy and integrations but maps no /mnt/skills root, so LocalSandbox.list_dir resolved the root to its literal host path and the host scan raised FileNotFoundError before the virtual sub-directory overlay could list the categories. list_dir now treats a missing host path as an empty listing when at least one mapping is mounted inside the requested container path; paths with nothing mounted inside them still raise FileNotFoundError. (#5857)

• examples: The Jev fetched-content screening example no longer lets a misbehaving endpoint or an unusual deployment past its fail-open and data-egress guarantees. A deeply nested answer body (RecursionError) or a huge noul integer (OverflowError) escaped the fail-open path and, inside the per-message task group, cancelled the other messages' screening requests and dropped every flag of the tool call — parsing now runs inside the fail-open block, which catches both. The 16 KiB response cap counted decoded bytes, so a compressed body could expand past it first; requests now send Accept-Encoding: identity and drop encoded responses. A plain-HTTP loopback endpoint, the only plain-HTTP form the validator accepts, followed HTTP_PROXY and ALL_PROXY and sent the bearer key and excerpt to the proxy in cleartext; such endpoints now build the client with trust_env=False, while HTTPS endpoints keep proxy settings. The root README also no longer says the excerpt is always PII-redacted: it is sanitized, and redacted only when pii_redaction is enabled. (#5858)

• scheduler: One scheduler's late completion write can no longer clobber another scheduler's fresh claim of the same run. ScheduledTaskRunRepository.update_status guarded expected_lease_owner (and the protect_terminal backfill) on a plain session.get, so when an expired launch lease was requeued and re-claimed by another scheduler (lease_owner=B) between that read and the write, the stale guard passed and the first scheduler's late write cleared B's lease fencing and wrote failed over its launching claim. The row is now re-read under the parent task's writer lock — the same task → run lock order every other mutating path in this repository uses — with populate_existing=True so the identity map serves the fresh row; Postgres gains a matching FOR UPDATE row read. (#5860)

• tools: A synchronous call on a bound task or batch_task tool now goes through the bound runtime's own submitter and execution capacity instead of the process-global fallback. get_available_tools wraps the shared tool singletons in place with a sync func, but bind_task_tool and _bind_batch_tool rebound only the coroutine of their copies, so each copy inherited a sync wrapper around the unbound coroutine: its sync path fell through to the process-global submitter (the exact fallback the binding contract rules out) or raised NotImplementedError in a fresh process where the singleton had never been wrapped. Both binders now rebind func through the same make_sync_tool_wrapper helper, so both invocation paths of a bound copy run the bound coroutine. (#5861)

• models: CLI credential files whose token fields are not strings no longer load as "successful" credentials. The loaders in credential_loader.py guarded container fields, expiresAt, and the Codex account_id, but not the tokens, so a hand-edited or script-rewritten file with a number, list, or object in accessToken/access_token passed the truthiness check — a malformed Claude override from $CLAUDE_CODE_CREDENTIALS_PATH masked the valid ~/.claude/.credentials.json fallback, and a bogus Codex token became a garbage Authorization: Bearer … header ending in a confusing 401. Such tokens are now skipped (strings are stripped of padding, blanks count as missing), and a non-string refreshToken degrades to empty like account_id. (#5864)

• mcp: Durable MCP task status and cancel calls now authenticate as the task's persisted owner on HTTP/SSE servers with user_auth enabled. A task that submitted fine inside an authenticated Agent turn then failed every background call: McpTaskToolCaller never exposed the stored owner to the credential interceptor, so without a live run/request context credential selection resolved to default, the service retried that authentication failure instead of observing the remote task, and a service rebuilt from SQL failed the same way. Background HTTP/SSE calls with enabled user_auth now bind an ID-only owner through the existing user ContextVar and restore the previous context in finally; submit, stdio, and calls without user_auth keep their original context, concurrent owners stay isolated, and background calls still never touch headers_from_context request secrets. (#5870)

• agents: Loop detection no longer hard-stops paginated or content-varying calls to generic tools. The per-call key kept only the first salient argument (path/url/query/command/...), so an MCP fetch resuming with start_index, a search paged with page, or list_uploaded_files following its cursor collapsed onto one key, and the fifth distinct call ended the run with stop_reason=loop_capped. Keys now cover every argument; only the UI-narration description of bash/ls/glob/grep stays excluded (rewording it still cannot dodge detection), while description elsewhere remains keyed because it can be the payload. (#5872)

• middleware: Input sanitization no longer strips message metadata from sanitized user messages. InputSanitizationMiddleware rebuilt each sanitized HumanMessage from four selected fields, so anything outside content/id/name/additional_kwargs — response_metadata carrying gateway provenance in particular — was dropped in both the text and multimodal paths. Sanitized messages are now copied from the original with only content and additional_kwargs replaced, so metadata, identity fields, and the message subclass survive while the original request message stays untouched. (#5875)

• community: InfoQuest timeout options in config.yaml are now normalized the way the sibling search/fetch providers normalize theirs. deerflow.community.infoquest.tools handed the five documented numeric options (timeout, fetch_time, navigation_timeout, search_time_range, image_search_time_range) to InfoQuestClient unvalidated, and a $VAR reference is substituted verbatim from the environment — so timeout: $FETCH_TIMEOUT arrived as a string and the client's > 0 comparisons raised TypeError, turning web_fetch, web_search or image_search into a hard failure whose message pointed at the client instead of the config key. Values now pass through one coercion step: an integer, an integral float or an integer-form string is used as configured, while a boolean, a fractional value, a blank/non-numeric string or None falls back to the documented -1 (that filter is disabled) with a warning naming the rejected key. An already-valid integer config produces a byte-identical request. (#5883)

• sandbox: Keep AIO acquire serialization until a started acquire worker settles, even when the caller is cancelled. Inside the per-(user_id, thread_id) serializer region, in-process cache reuse and warm-pool reclaim ran as bare asyncio.to_thread() calls, so cancellation released the scope while the worker was still running and a retried acquire for the same user/thread could overlap it. Both steps now run through a helper that cancels work still queued (the old behavior) but keeps serializer ownership and drains a started worker across repeated cancellation; the flock wait, readiness polling, and the skills-projection step remain cancellable. (#5888)

• skills: Managed integration skill discovery stops descending at each skill package boundary. Unlike the public and custom skill loaders, the integration walk kept going after finding a SKILL.md, so a nested evaluation fixture carrying its own SKILL.md could surface as a runtime skill — or, with a matching frontmatter name, replace the real public skill. Provider and namespace directories without a SKILL.md of their own still expose their nested skills. (#5890)

• models: Claude threads no longer die with HTTP 400 after a few turns when prompt caching is on. ClaudeChatModel._apply_prompt_caching wrote its cache_control markers into blocks the request shares with the thread — langchain-anthropic passes Claude-native blocks (an image or document with a source, a search result) by reference — so markers were checkpointed with the messages, and from the third turn every request exceeded Anthropic's four-breakpoint limit with no way to recover the thread. Markers now land on copies, and every request first strips markers already present, with caching on or off, so a thread whose checkpoint carries stale markers works again on its next turn without a migration. (#5892)

• subagents: A durable batch no longer stays running forever when its last active item dies from an expired lease on its final allowed attempt. claim_items marked such an item failed but never refreshed the parent batch, so a batch whose final item ended this way kept running with no completed_at and no terminal result to observe. Lease recovery now refreshes the batch in the same transaction: a batch with no successful items becomes failed, one with partial success becomes completed, failed item counts stay visible, and an explicit item retry reopens the batch as before. (#5897)

• agents: A provider that reuses a tool_call_id across runs no longer corrupts the durable delegation ledger. Entries were deduplicated by the raw ID with the earlier run_id carried forward, so a later run's delegation with the same ID could replace the earlier entry — its task vanished from durable context and max_total_subagents undercounted that run — and its reply could be mistaken for one to an older orphaned task. The ledger now keys entries by (run_id, tool_call_id) for capture, the retained window, and terminal-status protection; orphan closure on a new user turn is bounded by that run's opening message, and a resumed run without a new user message keeps an already-answered entry. (#5898)

• sandbox: Sandbox network-policy mutations now drain across caller cancellation. The async wrappers for consume_network_policy_events(), deny_pending_network_policy_events() and decide_network_policy_request() offloaded the stateful trusted-proxy mutations with bare asyncio.to_thread(), so cancelling the awaiting tool/agent task left the lifecycle boundary while the policy state was still changing. All three now route through the cancellation-safe run_sync_lifecycle_operation() helper: the admitted worker settles first, then the original CancelledError propagates. (#5899)

• tracing: Langfuse traces now carry the model that actually runs. The model:<name> tag was injected before model resolution, so a default-model run could carry no model tag at all, and a fallback run kept the name of the request that was rejected. LeadAgentAssembly now exposes the resolved model as effective_model; the Gateway worker injects trace metadata after assembly, and the embedded client resolves its agent before injecting, so both tag the selected default or fallback model while caller-provided metadata keeps precedence. (#5902)

• runtime: Image-only user input is now journaled once per run. RunJournal used the optional text summary to decide the input was already captured, and a textless message leaves that summary None, so every later model call appended another llm.human.input event and inflated message_count; a batched callback could even record an older prompt after the latest image-only turn. Capture is now tracked independently of the nullable summary, and the batch scan stops once input is recorded; the media content and the empty display text are preserved. (#5903)

• mcp: Make MCP task notification recovery rollback-safe ahead of the atomic launch reservation. The worker reused the batch scan timestamp after asynchronous run lookups and launches, so retry delays started too early and repository expiry predicates compared against a stale time, and unexpected per-record failures were handled only after the whole batch gather() finished, tying one record's retry timing to its slowest sibling. Lookup and launch outcomes now use a completion time bounded not to precede the claim, per-record failures are released inside each child task, and repositories can read, recover, poll, and settle a launching notification — preserving its snapshot and idempotency key — while no production path writes that state yet, so an older Gateway stays compatible after a rollback; the frontend keeps polling while a notification is launching. (#5908)

• subagents: Cancelled or timed-out sub-agent executions keep token usage already reported by completed model calls. A model can finish and report usage while model middleware is still awaiting, before the graph publishes its next values frame; cancellation in that window bypassed the result-handling branches, so the outer timeout/cancellation wrapper finalized the result from the older progress snapshot — two completed responses costing 15 and 30 tokens reported only 15. After stream cleanup drains, the executor now publishes the token collector's final cumulative snapshot before the terminal status is chosen; first-terminal-write semantics, cancellation propagation, and parent-journal deduplication are unchanged. (#5910)

• paths: IDs with a trailing newline are now rejected by the path isolation validators. Python's $ also matches just before a final newline, and _validate_user_id, _validate_project_id, and _validate_integration_id used .match(), so a caller-supplied ID like "alice\n" passed the documented restricted-charset check and produced a filesystem bucket the strict grammar never intended. All three now require a fullmatch, so only documented characters through end-of-string are accepted. (#5911)

• uploads: An upload filename containing a NUL character no longer fails the request with a 500. Normalization let the embedded NUL through to os.lstat(), which raised an unhandled ValueError (lstat: embedded null character in path) and aborted the upload. normalize_filename now rejects such names up front; in a multi-file request the invalid file is skipped and the remaining valid files are still stored. (#5915)

• goal: The agent now sees the active /goal on every model call. ThreadState.goal previously reached only the goal evaluator, so a goal set through PUT /goal, DeerFlowClient.set_goal() or the TUI was ignored, and compaction could take the goal away with the message that stated it. DurableContextMiddleware now opens its hidden <durable_context_data> message with an <active_goal> element — HTML-escaped, capped at 4,000 characters like the goal routes, and PII-redacted when redaction is on — and the durable-context contract gains a static exception letting the agent work toward that element at user priority, with no system or developer authority. active_goal joins the input sanitizer's tag denylist, so user input and remote results cannot forge it; subagents, whose state carries no goal, are unaffected. (#5917)

• frontend: A fence line with an info string (```python) no longer closes the open code block. CommonMark requires a closing fence to be at least as long as the opening one and to carry no info string, but of the three fence scanners only the Mermaid normalizer checked both halves — the render path (stripLeakedSystemTags) and the export path (stripInternalMarkers) compared just fence character and length, so the block ended early and the rest was treated as prose: render stripped the system-marker tags inside sample code and exposed their content, and thread export deleted the whole <project>/<documents> span, losing user text. Both scanners now share the isClosingFence predicate that moved into core/streamdown/fences.ts. (#5919)

• skills: Skill discovery no longer rescans the same tree through symlink cycles. load_skills() followed directory links but never detected a link back to an ancestor, so two cyclic links in a namespace repeatedly expanded the same tree — real scans exceeded a three-second diagnostic deadline where ordinary external links completed in under a millisecond. A shared walk_skill_directories helper now prunes a directory whose resolved path is already on the current traversal branch, across local and user-scoped public/custom/integration/legacy discovery; independent aliases of an external tree remain discoverable. (#5921)

• backend: asyncio subprocesses work again on native Windows. Since #3236, a backend/sitecustomize.py switched every Python process with backend/ on sys.path to WindowsSelectorEventLoopPolicy, whose loop cannot spawn subprocesses: the invoke_acp_agent tool failed instantly with an empty error (a bare NotImplementedError), and stdio MCP servers and local-sandbox command execution hit the same wall. The policy's stated premise (async psycopg) no longer holds — the postgres driver is asyncpg, which ships no Windows wheels, and the default SQLite backend runs on either loop. The file is deleted, restoring Python's default Proactor loop on Windows; the postgres benchmark script now sets the selector policy only for its own postgres cases. (#5937)

• sandbox: Non-finite OpenSandbox timeouts are rejected at provider construction instead of failing the first sandbox acquire. These options are provider-specific extras, so YAML .nan and .inf survived SandboxConfig validation and the provider's sign-only checks accepted them, deferring the failure to SDK or timedelta conversion at acquire time with a low-level runtime error. request_timeout and ready_timeout must now be finite positive numbers and sandbox_timeout finite non-negative (0 still means explicit cleanup); config.example.yaml documents the requirement. (#5944)

• subagents: Context snapshots no longer drop Anthropic-native document blocks. With context_mode="snapshot" delegation, document was missing from the recognized media types, so the block was silently discarded and a child could lose a requirement the parent had. Serializable documents are now kept as historical user-role data, with the existing reserved-tag and user-input neutralization applied at capture time to their textual fields (title, context, text-source data, content-source text blocks, and citation prose such as cited_text), cache_control removed, and nested copies isolated from the parent. Neutralization runs at capture because hidden snapshot messages skip the input-sanitization middleware; an unserializable document falls back to the existing historical-media omission notice. (#5948)

• sandbox: The middleware path that applies a network-approval response now drains across cancellation. SandboxMiddleware.abefore_agent() offloaded _apply_network_policy_response() with bare asyncio.to_thread(), so cancelling the awaiting agent task could leave the middleware boundary while a started decide_network_policy_request() worker was still mutating sandbox network-policy state — bypassing the provider wrapper that #5899 already made cancellation-safe. The async bridge now routes through run_sync_lifecycle_operation(); the synchronous before_agent() path is unchanged. (#5949)

• runtime: Subagent step-event flushes now survive host cancellation. A flushed batch was removed from _pending before RunEventStore.put_batch() was awaited, and only ordinary failures were re-buffered — CancelledError bypassed the except Exception fence, so cancellation could unwind the flush while persistence was in flight and a later store failure silently lost the batch. Each admitted write now runs in its own shielded task and absorbs repeated cancellation; if the drained write fails, the batch is re-buffered before the original CancelledError propagates, and ordinary store failures still log and re-buffer. (#5950)

• context: Two distinct task_note additions in one model response can no longer silently delete an existing note. Each call read the same state snapshot and merged its own update, so with seven existing notes the merged result kept only the last eight keys while both calls still returned saved. Remaining slots are now reserved for distinct new keys in the batch's tool-call order: excess additions return note_capacity before emitting a state update, existing notes are preserved, repeated writes to one new key share a slot, and structurally invalid sibling calls do not consume capacity. Slots freed by sibling deletions or failed calls become available in the next batch. For deployments with task_continuity.enabled, this changes the documented last-eight retention behavior for parallel overflow. (#5954)

• mcp: Deleting a thread now also tears down its persistent MCP sessions. DELETE /api/threads/{id} removed checkpoints, runs, events, feedback, and the live browser session but never the thread's persistent stdio MCP sessions — close_scope had no production caller — so a stateful server such as Playwright kept server-side state a recreated thread with the same id could inherit (stale pages, cookies), while the leaked owner task and its subprocess held memory and file descriptors. Deletion now calls the new MCPSessionPool.close_thread_scope() best-effort after the browser-session step, matching the legacy scope and every incarnation of that user/thread (established entries and in-flight creations) while leaving other threads untouched; a failing teardown still deletes the thread. (#5956)

• tools: Community search tools no longer fail on an infinite max_results. The coercion guards caught only TypeError and ValueError, but int(float("inf")) raises OverflowError, and both yaml.safe_load (.inf is a legal YAML float) and json.loads (accepts Infinity) can hand the guard an infinite value — instead of falling back to the default, the coercion blew up and SearXNG's web_search_tool returned an error payload for every search. The guards in brave, serply, serper, searxng, groundroute, and sofya (max_results, plus Sofya's content limit) now also catch OverflowError, so an infinite value falls back to the default like any other invalid input. (#5957)

• models: Whitespace-only Codex CLI credentials are now rejected at model initialization instead of producing an invalid Authorization header. The loader accepted any string token, so an auth.json with "access_token": " " constructed CodexChatModel successfully and the misconfiguration only surfaced when a provider request failed. String tokens are trimmed before the existing type and empty checks, blank or whitespace-only values count as missing credentials (the existing "Codex CLI credential not found" error), and a valid token keeps working with surrounding whitespace normalized away. (#5959)

• agents: An agent name differing only by a trailing newline is now rejected with 422 instead of a 500. The Gateway router validated AGENT_NAME_PATTERN with .match(), and Python's $ matches before a final newline, so POST /api/agents with {"name": "reviewer\n"} passed the router and crashed in FileAgentStore.create()'s fullmatch — the actionable message stayed in the server log while the caller got an internal error. DeerMem's validate_agent_name accepted the same names, letting agent_facts_directory() build a bucket its own validator then refuses to read back. Both validators now use fullmatch; nothing previously valid changes. (#5960)

• gateway: Gateway shutdown now closes pooled MCP sessions instead of abandoning them. The lifespan teardown closed the browser session manager but never MCPSessionPool, although a pooled session's owner task is the only thing that runs the transport's __aexit__ — once the event loop stopped, stdio MCP subprocesses and SSE/HTTP connections got no orderly close at all. Lifespan shutdown now awaits MCPSessionPool.close_all() immediately before the browser-session step, bounded by the shared shutdown-hook timeout and best-effort: a timeout or failure is logged and the remaining teardown proceeds. (#5961)

• tui: The headless deerflow --print and --json runners no longer leak a Python traceback when a run fails. Session creation, thread resolution, and stream iteration ran without an error boundary, so any raised exception — including the documented CheckpointModeMismatchError — escaped main() with no stable non-zero exit code. --print now prints one Error: <message> line to stderr and exits 1; --json appends a terminal {"type": "error", "data": {"message": ...}} record — every stdout line stays valid NDJSON even on a mid-stream failure — and exits 1. KeyboardInterrupt and SystemExit still propagate. (#5963)

• mcp: MCP task notification launches are now reserved atomically before an Agent run is created. The worker used to launch the run before persisting any durable launch phase, so if ownership expired or was reclaimed during that side effect, another worker could launch the same notification concurrently. The reservation is a single conditional UPDATE (begin_notification_launch) fenced by lease owner, per-claim token, lease expiry, and dispatch version; a stale unstarted snapshot facing a newer event is rejected before any launch side effect, while a recovered launching row keeps its original event and idempotency key. Deterministic launch rejections (400, 401, 403, 404, a bare 409, 422, 501) dead-letter immediately, and ambiguous 408/429/500 outcomes or cancellation preserve the launching snapshot for reconciliation without consuming the retry budget. No schema migration. (#5965)

• mcp: MCP connections created in the web editor now belong to the signed-in user instead of the deployment. The editor wrote deployment-wide configuration, so a connection added with a user's credentials became a shared Agent capability while ordinary users could not maintain their own. New owner-only CRUD lives at /api/mcp/personal/config, persisted under .deer-flow/users/<user_id>/integrations/mcp.json; the capability center shows deployment guides and shared connections under "Platform provided" and personal ones under "My plugins"; assembly combines shared tools with only the current user's connections (personal discovery stays outside the global tool cache), and durable tasks record the owning scope so submit, poll, and cancel keep it even when a deployment server name collides with a personal runtime name. Personal HTTP/SSE endpoints may connect only to public-network-vetted addresses with the original Host, TLS SNI, and certificate verification preserved, and privileged personal definitions recheck current administrator authority at discovery, invocation, and durable submit/poll/cancel (demotion fails closed). config.yaml tools and existing extensions_config.json entries remain shared. (#5966)

• middleware: PII redaction no longer empties response_metadata on the user messages it rewrites. The middleware hand-built the redacted HumanMessage from content/id/name/additional_kwargs, so a message carrying gateway provenance or other metadata reached the model with that field silently reset whenever redaction changed its content; the redaction itself was already correct. The rebuilt message now copies the original and replaces only content (deep-copied, since untouched blocks are retained by reference) and response_metadata, keeping id, name, and the message subclass without sharing mutable state with the original. Placeholders and redaction behavior are unchanged. (#5968)

• agents: Caller-attached response_metadata on the user turn now survives dynamic-context injection. DynamicContextMiddleware rebuilt the injected copy as a fresh HumanMessage carrying only content/id/name/additional_kwargs, silently dropping every other field — including response_metadata — from the model-bound message list, while the sibling PII-redaction and thread-data middlewares already used model_copy. The copy is now built with original.model_copy(update={"id": ...}), keeping the documented {id}__user id swap; UploadsMiddleware's user-message rewrite gets the same treatment. (#5977)

• persistence: A literal + in a PostgreSQL DSN query string survives schema injection. When database.postgres_schema is set, dsn_with_search_path() round-tripped existing parameters through parse_qsl/urlencode, and parse_qsl decodes + as a space — an HTML-form rule libpq does not apply — so application_name=web+app reached the server as web app, and options=-c timezone=UTC+8 decayed into -c timezone=UTC 8, no longer one -c setting. The helper now carries existing parameters through byte-for-byte and only appends (or merges into) a percent-encoded options=-c search_path=<schema>; keyword-form DSNs and postgresql+asyncpg:// normalization are unchanged. (#5978)

• goal: An active goal now survives a failed artifact delivery. A run could write and present an output, receive a satisfied goal evaluation, and delete the goal — and only afterwards would delivery verification mark the same run as an error (a terminal delivery-receipt write failure could produce the same inconsistency), leaving the thread without its goal despite unfinished work. A satisfied evaluation is now only a completion candidate: the worker clears the goal after delivery, receipt persistence and terminal cancellation arbitration succeed and successful status persistence is confirmed, re-checking the goal, the visible conversation and the checkpoint under the existing checkpoint-write reservation so a newer admitted run wins. Any failure retains the original goal and counters without an extra model call; normal completion, including runs without changed outputs, still clears the goal. (#5980)

• config: extensions_config.json saved as UTF-8 with a byte-order mark now loads. Both the runtime loader (ExtensionsConfig.from_file) and the raw read-modify-write reader behind Gateway skill toggles opened the file as plain UTF-8, so an editor-written BOM failed with Unexpected UTF-8 BOM (decode using utf-8-sig) — blocking MCP/skill configuration loading and preventing a toggle from saving an otherwise valid configuration. Both readers now accept an optional leading BOM; writes remain UTF-8 without one and raw $VAR references are still preserved. (#5983)

• agents: A non-finite read_file line bound no longer crashes the run inside loop detection. A model-emitted number such as start_line: 1e999 parses to float("inf"), and _coerce_line_number()'s int() conversion raised an uncaught OverflowError on the after_model path, ending the run with an opaque internal error instead of letting read_file's own schema validation return a normal tool error. The coercer now treats OverflowError like its other unusable inputs: the bound falls back to None and the call keys as the existing open-ended read; integral bounds behave exactly as before. (#5990)

• integrations: Completing a Lark authorization no longer flips the integration panel's runtime card to "not ready" in remote provisioner mode. The mutation response verified authorization but never probed sandbox runtime readiness, and the frontend cached it wholesale, so the panel showed a state a page refresh would contradict. Install, configuration completion, credential switching, and authorization completion now share one mutation-status builder probing runtime readiness consistently with the GET /lark/status route, built after the per-user credential lock is released (the probe previously ran while holding that lock and could block other credential operations for a network timeout). The status API exposes sandbox_runtime_probed, letting the frontend keep previously confirmed runtime fields only for unprobed mutation responses. (#5994)

• channels: Feishu and DingTalk inbound attachments are now readable by the sandbox. In AIO/Docker sandbox mode the sandbox runs as a non-root user over the bind-mounted thread directory, and these two channels persist inbound files themselves at 0o600 — the agent got a /mnt/user-data/uploads/<name> path that read as empty, so attachments from these channels were silently unusable. Both now grant group/other read right after their own write, matching the channel manager and HTTP upload paths (Telegram was already covered by #5581). Local sandboxes are unaffected. (#5998)

• database: DatabaseConfig now validates pool_size, pool_recycle, and command_timeout strictly. YAML booleans were silently coerced to 1/0, so pool_size: true limited the pool to a single connection and command_timeout: true imposed a 1-second statement timeout; pool_size also accepted non-positive values (0, -1), and command_timeout accepted inf (via YAML .inf or "1e999"), which never times out. pool_size and pool_recycle now enforce positive integers, and command_timeout rejects booleans and non-finite floats while null still disables the timeout. (#6009)

• community: The Firecrawl tools now close the pooled async HTTP client each call constructs. Since the async migration, _get_firecrawl_client() builds a fresh AsyncFirecrawlApp per call, and that app eagerly creates an httpx.AsyncClient-backed pool with no public teardown, so every web_search_tool / web_fetch_tool call abandoned one unclosed pool. Both tools close it in a finally through a best-effort _aclose_firecrawl_client helper: a client without the internal _v2_client.async_http_client handle degrades to a no-op, and close failures are logged without masking the tool's own result or error. (#6013)

• capabilities: Administrators can manage shared MCP servers again from the Capability Center. After #5966 the Platform provided section rendered the same read-only projection for admins and ordinary users, so add, edit, enable/disable and delete were impossible even though the admin-only /api/mcp/config endpoints still supported them. Administrators (outside static mode) now get the MCP editor under Platform provided, writing the shared deployment configuration that applies to all users; ordinary users keep the read-only view, and My plugins continues to manage personal configuration. MCP queries distinguish both scope and user ID, and control accessible names carry the localized ownership section, so same-named shared and personal connections are distinguishable. (#6018)

• gateway: Drain managed subagent store mutations across request cancellation. The create/update/delete endpoints of /api/subagents offloaded persistent store writes with bare asyncio.to_thread(): cancelling the request stopped only the awaiter, so an already-started file/SQL store mutation could keep committing after the request lifecycle had unwound. All three writes now route through the existing await_drained() helper (wrapped as one _run_store_mutation helper), so an admitted mutation reaches terminal state before the caller's cancellation propagates; catalog reads and validation keep their existing cancellation semantics. (#6023)

• gateway: Drain the admin-only managed-model save across request cancellation. PUT /api/managed-models persisted the shared encrypted model catalog through bare asyncio.to_thread(_save, body): cancelling the request stopped only the awaiter, so an already-started ManagedModelStore.save() could keep committing catalog state after the request lifecycle had unwound. The save now drains through the existing await_drained() helper, and a worker failure after cancellation is logged with the exception type only before the consumed result discards it — storage errors can carry credentials. Catalog reads and connection probes keep their existing cancellation semantics. (#6024)

• config: Numeric config fields that accepted silently-broken values now carry range bounds and boolean rejection, mirroring the earlier stream-bridge and database-pool guards. sandbox.port is bounded to 1-65535 instead of surfacing as an opaque Docker bind error; circuit_breaker.failure_threshold requires at least 1 (a threshold of 0 tripped on the check itself); summarization.trim_tokens_to_summarize requires at least 1 instead of max(1, ...) quietly making 1-token summaries; mcp_servers.*.tool_call_timeout/session_init_timeout, models.*.stream_chunk_timeout, and run_events.max_trace_content reject 0/inf values that aborted every call or stream or truncated traces to nothing; mcp_servers.*.oauth.refresh_skew_seconds rejects negatives. YAML true no longer coerces to 1 on any of them; documented-valid values such as sandbox.idle_timeout: 0 and null timeouts are unchanged. (#6026)

• frontend: On Windows, pnpm dev now binds 127.0.0.1 by default. The dev server otherwise listens on 0.0.0.0, and when Hyper-V/WSL2/winnat reserved the port range covering 3000, startup failed with Error: listen EACCES: permission denied 0.0.0.0:3000 while a loopback bind on the same port succeeded. An explicit -H/--hostname is passed through, so LAN access remains available via pnpm dev -- --hostname 0.0.0.0 (with DEER_FLOW_DEV_ALLOWED_ORIGINS as before). The default make dev flow is unaffected — the dev nginx upstream already targets 127.0.0.1:3000 — and macOS/Linux behavior is unchanged. (#6034)

• gateway: The bundled-interpreter repair hint no longer shows a backslash-doubled interpreter path on Windows. The HTTP 400 detail for a bundled MCP server pointing at a different Python interpreter interpolated the path with {sys.executable!r}, and repr() escapes backslashes, so the hint read 'D:\\...\\python.exe' — wrong to paste into a terminal and noisy in the JSON it tells you to edit. The detail now renders the path as a JSON string for the server config and prints the raw path alongside for terminal use; POSIX paths only change in where the quotes come from. (#6040)

• channels: Inbound Slack text now decodes the three entities Slack always escapes, so if a < b && c > d: print("R&D") reaches the agent as typed instead of if a < b && c > d: print("R&D"). <, > and & are decoded after bot-mention stripping — a real mention is a raw <@U…> while a user-typed <@U…> arrives escaped and stays plain text — with & decoded last so an escaped entity is decoded exactly once. Previously the corrupted text drove the agent's reasoning, could leak < into files it wrote, and was escaped a second time when quoted back into Slack. Outbound escaping is unchanged. (#6045)

• sandbox: Glob patterns with a directory prefix are now root-relative, and ** is recursive. path_matches — behind the glob tool and the grep glob= filter on every provider — used PurePosixPath.match, which on Python 3.12+ matches from the right and treats ** as a single-segment *: src/**/*.py missed src/top.py and deeper files, while docs/*.md also matched vendor/docs/b.md. Patterns containing / now match segment by segment from the search root, with ** spanning zero or more directories; basename-only patterns still match at any depth. (#6046)

• cli: deerflow --print and --json now exit 1 when a run ends in an LLM error fallback. Provider failures are not raised — LLMErrorHandlingMiddleware turns them into an AI message flagged deerflow_error_fallback — so a headless run with, say, an expired credential printed the fallback text and exited 0, and the calling script treated the run as a success. Both modes now follow the raised-exception failure contract: --print still writes the fallback text to stdout but adds Error: LLM request failed (error_type=…, error_reason=…) on stderr; --json appends a terminal error record after the streamed events. A mid-run fallback followed by a real final answer still exits 0. (#6056)

• frontend: The run duration now labels the reasoning disclosure instead of sitting in a separate footer row. A completed answer showed a generic reasoning header above the answer and a duration line under the hover-only action toolbar, which left an unexplained gap whenever the toolbar was hidden. The disclosure now reads Took 31s (用时 31 秒) with a compact chevron, stays expandable by mouse and keyboard with a localized visually hidden reasoning cue in its accessible name, and is bound to the owning run in answer bubbles, processing groups, and subagent groups; the separate duration footer is gone. Streaming and history entries without a duration keep the generic label, restored reasoning starts collapsed, and live reasoning still closes one second after completion. (#6057)

• sandbox: Every sandbox bash command now carries the authenticated user id in DEERFLOW_USER_ID. Skill scripts run as bash subprocesses inside the sandbox and cannot reach the Gateway auth context, so user-scoped skills had no way to learn the serving user (issue #3919). Commands are prefixed with export DEERFLOW_USER_ID=<quoted> (unset DEERFLOW_USER_ID when the id is unusable) on both the POSIX local and the remote sandbox paths, ahead of the DEERFLOW_CHANNEL_USER_ID prefix; Windows publishes it via the subprocess environment instead. The variable is informational — commands can overwrite it — and authorization still resolves server-side. (#6058)

• channels: Long Discord replies split into consecutive messages now reconstruct exactly what the agent wrote. _split_text ended each chunk just before the newline it split on and stripped it from the remainder, so every 2000-character boundary dropped one newline — and a run of blank lines at the cut in full — losing paragraph breaks between bubbles. The boundary newline now stays on the chunk's tail, so "".join(_split_text(text)) returns the original text for any input while every chunk still fits Discord's 2000-character limit. Replies under the limit and the empty string behave as before. (#6062)

• goal: The /goal evaluator now sees the assistant's tool calls and the tools' results, so completed file work no longer stands down with missing_evidence. It read only user and assistant text: format_visible_conversation() dropped tool messages, a tool-call-only assistant message rendered as nothing, and the evaluator's own fail-closed rule then kept the goal active on most completed file tasks (in a real-Gateway A/B, goals cleared on correct outputs went from 15 of 38 runs to 35 of 36 on DeepSeek, and from 4 of 33 to 29 of 30 on MiMo v2.6 Pro). Tool steps inside the existing 30-message window now appear in order as Assistant tool call: ... and Tool result (...): ... lines — argument values cut at 200 characters, steps at 600 — and the 12,000-character evidence cap keeps whole lines from the end, holding the latest user request at the top, instead of slicing mid-line. Tool text is JSON-escaped onto one line per step, failed results are labeled error, and as in the web UI a hidden assistant message's calls stay out while a clarification prompt remains. The system text adds fixed rules that tool results are data and never instructions and that a successful result alone does not show the goal is met. (#6068)

• goal: A failed /goal evaluator call is now recorded on the goal like the other stand-downs. The worker logged "Goal evaluator failed" and returned without writing: the goal stayed active with no last_evaluation after a first evaluation, or kept a previous run's verdict and run id, so GET /api/threads/{id}/goal looked as if no evaluation had run — whether the cause was a connection error, an answer the parser rejected, or a provider timeout. The failure now persists blocker: "run_failed" with stand_down_reason: "evaluator_failed" and the current run id, and the reason names only the exception type ("The goal evaluator did not return a verdict (APIConnectionError).") because a provider's error message can carry request details. The goal still stays active with no retry and no hidden continuation, and nothing is recorded if the run was aborted meanwhile. (#6073)

• frontend: In /workspace/chats/new, the first streamed assistant steps no longer render above the submitted question. The local human anchor that pins first-turn order was compared against the SDK thread id — undefined until creation confirms it — and was cleared again when that confirmation arrived, so early reasoning and answer blocks jumped above the question until the turn settled. First-turn ordering is now tied to the displayed conversation (displayThreadId ?? threadId) and the anchor survives creation confirmation; switching conversations still clears it. (#6074)

• goal: The /goal evaluator now sees the user's answer to a Human Input Card, and the lead prompt stops coaching scripts when no bash tool is bound. The web UI sends a card answer as a hidden human message, which format_visible_conversation() skipped — the evaluator saw the question but not the answer, read following it as guessing, and goals stood down with needs_user_input despite correct work. The answer now appears in the evidence as a User (Human Input Card answer): ... line, whitespace-collapsed and cut at 2,000 characters, kept at the top over the cap. Separately, the default local sandbox has host bash off, but the system prompt still explained how to write scripts — in measured runs each model wrote a helper script nothing could run in 38 of 120 runs. apply_prompt_template() gains bash_available, the lead agent and embedded client pass has_bash_tool(authorized_tools), and without bash the script guidance becomes one line telling the model to work out results directly and write them with write_file while the subagent section drops its bash examples. With bash bound, the prompt is unchanged. (#6082)

• gateway: Drain the agents router's persistent writes across request cancellation. POST /api/agents, PUT /api/agents/{name}, DELETE /api/agents/{name} and PUT /api/user-profile ran their store writes through bare asyncio.to_thread: a disconnect that cancelled the handler either cancelled a still-queued worker — the write silently never happened — or detached from a running one, silently dropping its failure because the handler's except (500 plus error log) never ran. All four writes now go through a _drained_write helper built on the existing await_drained() helper, so an admitted worker finishes before the caller's cancellation propagates; a lost failure is logged with the exception type only, and expected domain errors such as AgentExistsError still reach the connected caller as its 409. Reads stay cancellable: abandoning them loses nothing. (#6087)

• frontend: APNG, AVIF, and WebM artifacts now show media icons in the workspace artifact list and viewer instead of the generic document icon. All three formats are previewable in the browser, but getFileIcon had no case for their extensions: apng and avif now map to the image icon and webm to the video icon, matching the existing preview support. Unknown extensions keep the document fallback. (#6089)

• frontend: Saved Dockerfile and Makefile artifacts now open as editable source instead of falling back to the unsupported-file download view, even though both names were already in the language map. getFileExtension split the full path on . instead of taking the basename first, so an extensionless name — or one under a parent directory that contains a dot — never resolved to its map entry. Detection now runs on the basename; existing suffix and hidden-file mappings are unchanged, and streaming write-file previews keep their own text fallback. (#6091)

• mcp: Drain personal MCP configuration writes across caller cancellation. Personal config writes ran the durable file mutation through bare asyncio.to_thread(_mutate, ...), so a request cancelled after the worker started could unwind while the admitted persistent mutation kept running without request-side lifecycle ownership. The mutation is now drained through the cancellation-safe await_drained() helper: the route stays alive until the started write settles, then the original CancelledError propagates. The read-only path keeps its existing cancellation semantics. (#6093)

Security

• authz: Enforce permission checks on routes that only had authentication, and scope USER.md per user. POST /api/threads, /api/threads/search, /api/runs/stream, /api/runs/wait, every /api/memory route, and the custom-agent routes carried no @require_permission, so a provider configured to deny threads:write/runs:create/... could not enforce those decisions. GET/PUT /api/user-profile also read and wrote one global USER.md, letting any authenticated user overwrite or read everyone's prompt context — the file now lives at {base_dir}/users/{user_id}/USER.md. (#4989)

• gateway: Preserve owner isolation on threads whose metadata row is missing or NULL-owner. #5448's internal-caller run scoping returned an empty filter for every trusted internal caller, and ThreadMetaStore.check_access(..., require_existing=False) deliberately admits a missing metadata row (legacy compatibility) and NULL-owner rows, so an internal caller acting for owner A could list or fetch owner B's persisted runs on such a thread via /runs, /runs/page, or /runs/{run_id} (the single-run request returned 200 instead of 404). _run_scope_user_id now consults the thread meta store: established-owner threads keep the unfiltered read, while missing/NULL-owner threads fall back to the acting owner's raw stamp, keeping cross-user runs hidden. Browser and API sessions are untouched. (#5484)

• frontend: Gate tool-step links through the shared isSafeHref scheme allowlist. The web_fetch, web_search, and image_search tool steps put URLs straight into <a href target="_blank">, so a ms-msdt:, search-ms:, or vscode: link drawn from model-written tool arguments (or provider results) rendered clickable — backend URL validation never sees a still-streaming or failed fetch — and one click plus the browser's external-application prompt handed an attacker-chosen URI to a local application. Unsafe URLs now render as the same inert "Unsafe link omitted" span markdown links use; web_fetch also stops throwing on a non-string url arg, and missing tool-call args normalize to {} across every tool branch. (#5526)

• uploads: Stop the embedded client's uploads from writing through symlinks. The uploads directory is writable from inside the sandbox, so a process there (for example one steered by prompt injection) could plant notes.txt -> /host/path and have the next DeerFlowClient.upload_files — or a converted Markdown companion — overwrite an arbitrary host file with the client's privileges. Uploads now publish through a no-symlink copy helper; unsafe destinations are skipped and reported via skipped_files with success: false, matching the Gateway's contract. (#5578)

• uploads: Convert a private copy of the staged bytes instead of the name they landed under. The uploads directory is writable from inside the sandbox, so a process there could swap an upload's committed name for a symlink to any host file in the window before document conversion; the converter opens by path and follows it, and the host file's content came back into the thread as the converted .md companion. The Gateway now converts a descriptor-backed copy in a private temporary directory, and the client converts the caller's own source path — a swapped name no longer redirects the read. (#5611)

• authz: Enforce threads:write for Live Browser WebSocket connections. The WebSocket bypassed the HTTP authentication middleware, and browser_stream() checked authentication, Origin, thread ownership and browser availability without resolving route permissions — so a thread owner whose policy denies threads:write could still connect to the thread's Live Browser, receive frames, and dispatch input events. Denied connections are now rejected with close code 4403 before session acquisition; behavior is unchanged when fine-grained authorization is disabled. (#5621)

• gateway: Reject external system and developer messages with HTTP 400 before checkpoint writes, run admission, or agent execution. Such messages were previously accepted and could be persisted, merging into the agent's system context on later turns. Message representations are canonicalized once and validated; ordinary user, assistant, tool, and attachment messages and trusted internal system messages are unaffected, and existing checkpoints are not rewritten. (#5651)

• skills: A user-scoped .skill install now resolves the static content scan from the same app config as the inherited archive preflight. The user-scoped storage override passed no app_config, so the content scan fell back to the hot-reloaded process global: when a storage's snapshot had skill_scan.enabled: true and a later config.yaml edit set it to false, the preflight ran but the content scan silently skipped and a CRITICAL archive (such as embedded private-key material) installed anyway. The per-file LLM scan now forwards the same config instead of reading the global for model selection. (#5703)

• sandbox: Restored sandbox references are now scoped to the authenticated user and thread. An authenticated caller could submit input.sandbox.sandbox_id on a thread they owned, and the AIO restore path resolved the body-supplied id from a process-wide active-sandbox cache without checking the cached sandbox's (user_id, thread_id), so a known still-active foreign sandbox id could have sandbox-backed tool calls dispatched to it. sandbox is now server-owned state: external run input and thread-state updates reject it with HTTP 400, checkpoint reuse requires a scoped match and otherwise falls back to a canonical acquire(user_id, thread_id) persisted with Overwrite, and only the server-created fork path may borrow a parent's sandbox. (#5736)

• logging: Redact space-carrying request targets in urllib3 retry log lines. Three redaction patterns (Retry: …, Retrying (…) …, and the quoted request line) stopped matching at the first space, so an origin-form path containing an interior space — allowed by RFC 9110 — reached the log in cleartext with its signature query intact; the Retrying shape logs at WARNING, so it landed in production logs without DEBUG. The patterns now match the target up to its terminating quote or end of line, consistent with the already-hardened Redirecting and increment-retry slots. (#5745)

• auth: Claim the first admin atomically in POST /api/v1/auth/initialize. The handler counted admins in one session and created the user in another with no lock or constraint between them, so two concurrent first-boot requests with different emails both succeeded and both became admins — silently, since setup-status then reports an initialized system. Count and insert now share one serialized transaction (BEGIN IMMEDIATE on SQLite, a transaction-scoped advisory lock on PostgreSQL, unknown dialects fail at boot), and a losing request gets the documented 409 system_already_initialized; sequential behavior and response shapes are unchanged. (#5776)

• sandbox: Require sandbox:execute before view_image reads. A role allowed to call view_image while denied sandbox:execute could still read an image from the current thread's allowed directories, and the image middleware could place those bytes into a model request — an authorization gap, not a cross-user read. Synchronous and asynchronous reads now check execution authorization, and the middleware rechecks before reading an image recorded in thread state, including after a role change. (#5799)

• authz: Enforce model:use on the suggestions endpoint. With model authorization enabled, a user denied a model could still invoke it through POST /api/threads/{thread_id}/suggestions — by naming it, or by omitting the name when the denied model was the configured default — even though GET /api/models/{model_name} returned 403 for the same user. The shared model-details check now runs before model creation, returns 403 on denial, and sits outside the best-effort handler so a permission failure cannot become 200 with empty results. (#5816)

• sandbox: Scope viewed-image host reads to the current thread. External run input or thread-state updates could supply viewed_images metadata with a chosen actual_path, and after matching view_image history the middleware read that host path into the next model request, so one user's request could carry another user's image. External writes to the server-owned viewed_images and thread_data channels are now rejected with 400 before run admission, and a saved host copy is read only when the recorded virtual path, resolved for the current user and thread, matches actual_path; cross-thread references stay unavailable until view_image runs again. (#5824)

• memory: Enabling pii_redaction now also cleans the queued memory payload, closing the slice #5527 deliberately left open. Request-scoped redaction keeps originals in thread state, and MemoryMiddleware._resolve_add_args() passed those raw messages into MemoryManager.add_nowait(...), so with pii_redaction.enabled=true the buffered extraction payload, the extraction model's input, and the persisted facts could still carry raw PII. The middleware now takes the same pii_redaction_config knob as the summarization/durable-context/title paths and redacts the conversation at the enqueue boundary — one chokepoint covering both agent hooks — through the shared redact_text() seam; the buffered payload itself becomes clean, and messages are rebuilt via model_copy so originals are never mutated. The gate stays off by default and behavior is unchanged while unset. (#5577)

• authz: Skill authorization is now enforced at agent assembly and activation, so an RBAC policy such as skills: {allow: ["data-analysis"]} can actually deny a skill — Phase 2A (#4439) covered Gateway routes, but skills still followed only the agent-config allowlist. The lead agent's catalog, subagent config.skills loading, describe_skill, and every activation gate now consult the AuthorizationProvider's skill policy through one shared authorize("skill", "activate") helper; denial returns the membership-denial message, and provider errors follow the configured fail-closed/fail-open policy. A denied read_file of a SKILL.md is stamped skill_context_denied, so durable context, skill allowed-tools, and autonomous secret bindings never activate the denied skill. (#4541)

Documentation

• docs: Fix the Apple Container verification instructions. The guide pointed to a test_container_runtime.py script that does not exist and to the old runtime implementation; it now references LocalContainerBackend in local_backend.py, documents the existing Docker selection for restricted networking, and uses the two existing runtime-selection pytest cases (which mock runtime commands) as verification. (#5605)

• config: Move the # Sandbox Configuration banner in config.example.yaml to sit directly above the sandbox: key it introduces instead of the uploads: block it had drifted twenty lines away from, and give uploads: a banner of its own. Comment-only change; config.yaml files generated from the example are unaffected. (#5652)

• docs: Clarify the upgrade workflow for existing local and Docker deployments in the README and the operations-and-troubleshooting guide: make config and make docker-init are first-time setup steps, not routine source-upgrade steps, and make config-upgrade is only needed when a release adds configuration fields. (#5654)

• docs: Document how to connect DeerFlow to a local llama.cpp llama-server (closes #2931). config.example.yaml and the English/Chinese configuration pages gain an OpenAI-compatible Qwen example (use: langchain_openai:ChatOpenAI against http://localhost:8080/v1), and cover the --alias model name, a Docker-reachable base_url, the API key when llama-server --api-key is enabled, and the chat-template/tool-calling requirement. (#5688)

• extensions: Cover full-stack plugins and request-scoped run evidence in the extensions manual (deerflow-extension-api 0.2.3, en and zh). A new Full-Stack Plugins chapter documents registry.plugin(), BrowserModule/BrowserAssets, backend actions, model tools, and settings; the run-evidence chapter covers resolve_run_evidence_reader/require_run_evidence_reader with a per-user route example; and plugin sections are added to Reference, Troubleshooting, and Operating Extensions. (#5775)

• docs: Correct the documented skill and MCP enable/disable endpoints. The docs site and backend/docs/API.md pointed at POST /api/extensions/skills/{name}/enable and similar routes that do not exist in the gateway (404/405); the skill toggle is PUT /api/skills/{name} with {"enabled": bool} and the MCP toggle is PATCH /api/mcp/config with {"server_name", "enabled"} (both admin only), now documented in the en/zh skills and MCP pages and in API.md with working cURL examples. (#5778)

• docs: Fix backend doc examples that referenced APIs that do not exist. The PATH_EXAMPLES.md upload example imported a THREAD_DATA_BASE_DIR symbol no module exports, and pointed at the legacy upload bucket; it now resolves the directory via get_uploads_dir(thread_id) from deerflow.uploads.manager, which reads the bucket the Gateway actually writes to. CONFIGURATION.md also drops a sandbox.auto_start key that SandboxConfig never declared and no code reads. (#5798)

• docs: Make the custom-memory-storage guide followable. The harness memory.mdx / customization.mdx snippets imported a module that does not exist, showed a storage class the factory cannot construct and the memory updater's calls reject, documented a module:Class value form that storage_class never resolves, and promised a graceful fallback where the code deliberately raises. The guide (English and Chinese) now names the real module, matches the real call shapes, and states the actual error behavior. (#5844)

• docs: Add a ten-chapter checkpoint storage manual (harness/checkpoints) in English and Chinese — quick start, channel modes, snapshot cadence, history cache, resume and rollback, operations, observability, troubleshooting and reference. The docs site's first coverage of dual-mode checkpoint storage: why the mode and snapshot cadence are frozen per process (only checkpoint_graph_cache.accessor_graph_max re-reads at runtime), why a mode-mismatched request 409s, why delta runs cannot fork, and how retained storage really grows — periodic snapshots keep the full message list, so delta divides the quadratic term by the cadence rather than removing it. (#5845)

• docs: Fix harness client examples that document an async API which does not exist. DeerFlowClient has no astream/ainvoke, but the "Create Your First Harness" tutorial and the integration guide (en and zh) are built around them, so the tutorial's first call raises AttributeError; the snippets also nest overrides in a config={"configurable": {...}} dict that stream()/chat() silently swallow into **kwargs. Examples now call the sync client.stream(...) / client.chat(...), pass flat overrides (model_name=, subagent_enabled=), configure agents via the constructor (DeerFlowClient(agent_name=...)), and use a sync generator in the FastAPI SSE example; "Async streaming" is retitled "Streaming". No API change. (#5843)

• docs: Document the pluggable MemoryManager architecture in the harness memory page (frontend/src/content/{en,zh}/harness/memory.mdx), which previously covered configuration and storage only, so integrating an independent memory system meant reverse-engineering the contract from source. A new "Memory Manager" chapter explains the backend-neutral contract, backend selection via manager_class / backend_config, a comparison of the five built-in backends, and how deermem and openviking are each wired in; "Implementing your own memory backend" walks through a minimal runnable skeleton, the optional operations, failure semantics (MemoryConflictError → HTTP 409), and the host hooks. A callout in the existing "Custom storage backend" section distinguishes swapping DeerMem's storage_class from attaching a fully independent backend. (#5929)

• docs: Correct MemoryManager guide details that fail when followed (en and zh; fixes to #5929). An OpenViking config with the documented failure_policy.read: fail_closed cannot build the manager — the key takes fail_open or raise — and mode: middleware is required, not merely recommended. from_config is mandatory alongside add and get_context; a backend skipping it resolved to None. Tool mode additionally needs get_memory() and the fact CRUD methods, because MemoryMiddleware is not installed there unless the backend sets requires_passive_writes_in_tool_mode; create_fact returns (memory_data, fact_id) and an unknown fact id raises KeyError (HTTP 404); staleness_review_enabled is on by default and all five flags live under memory.backend_config. (#5943)

• docs: Add the missing External Chat Message Roles section to the Chinese README, mirroring the English one between the gateway-admin-equals-code- execution and deployment-defaults notices. It states that run requests and manual thread-state updates reject client-supplied system / developer messages with HTTP 400 (session/PAT auth grants no system-prompt authority), that the check does not rewrite existing checkpoints — a restart does not remove persisted instructions — and how to verify locally with python backend/tests/poc_external_system_message_injection.py --help, including --expect vulnerable / --expect blocked on a disposable thread. (#6059)

Internal

• persistence: Add historical regression coverage for the run-change clock repair and its rollback. Databases created from the published migration graph at 0023_user_preferences or 0024_project_documents skip the later-inserted 0023_run_change_seq ancestor; new tests reconstruct both affected graphs and exercise the real startup bootstrap, legacy rows, and thread-delete reservation/state writes, and verify healthy positions survive repeated bootstrap, downgrade, and re-upgrade. Documentation only — the repair itself landed in #5517; no runtime behavior change. (#5518)

• capabilities: Internal cleanup of the capability gallery and MCP connection validation: named status/action helpers with early returns, a separate validate_mcp_connection() with unchanged 422 responses, a shared installationQuery(), and removal of an unused display-name argument from catalogForServer(). Rendered UI and behavior are unchanged. (#5580)

• deps: Bump anyio from 4.13.0 to 4.14.2 in /backend. (#5583)

• sandbox: Share offline search contracts across sandbox providers. A new 112-case parameterized suite exercises the same ls / glob / grep scenarios through all six adapters against a shared fixture filesystem, covering ignored descendants, special paths, grep scope, overflow, transport failures, and unavailable binaries. Production code is unchanged. (#5677)

• persistence: langgraph-checkpoint is bumped to >=4.2.0,<5.0 and the postgres extra's langgraph-checkpoint-postgres to >=3.1.2,<3.2, letting checkpoint_patches.py drop its InMemorySaver patch in favor of the upstream fixes for the dropped first write after a full → delta migration and for plain-value delta seed detection. The floors are load-bearing: without them a resolver can quietly install the versions whose bug is no longer patched. Behavior is unchanged — the local patch had been masking the bug. (#5734)

• tests: Cover the delta-history cache's full-to-delta migration and pin two open upstream DeltaChannel defects. The migration contract now runs with the history cache disabled, cold, and warm, asserting materialized history is digest-identical to an uncached saver; new regressions pin langgraph#8382 (same-superstep parallel writes replay out of live order) and langgraph#8448 (the Postgres paged delta walk poisons its cursor, so older checkpoints hydrate empty), skipping until upstream fixes land. No runtime behavior change. (#5797)

• tests: Make the blocking-I/O Lark auth-completion test work on Windows. Its CLI fixture was an extensionless POSIX shell script that production CLI discovery cannot resolve there, so the test failed with HTTP 404 (lark-cli is not installed) before reaching the subprocess work it covers. The fixture is now a .cmd stub on Windows (an executable shell script on POSIX) in a directory containing spaces, resolved through the production PATH lookup; fake app credentials let auth completion reach the CLI, and the test asserts authentication success and the returned username. Fixture invariants are documented in backend/tests/AGENTS.md. (#5826)

• tests: Skip 22 POSIX-host-bound backend tests on Windows dev hosts instead of failing them. Eleven test_extension_dependency_sync.py cases spawn bare make -n (GNU make is not part of the documented Windows setup — FileNotFoundError), ten test_lark_broker.py cases execute #! scripts directly (WinError 193), and one boxlite shim test asserts POSIX exec-bit semantics after os.chmod. All guards are conditional skips: a Windows host with make on PATH still runs the Makefile contract tests, the pure-logic tests run everywhere, and Linux/CI coverage is unchanged. (#5931)

• tests: Write the tests/test_file_signature.py fixtures as bytes so Windows text-mode newline translation cannot leak in. Three tests built fixtures with Path.write_text(...) yet asserted byte-exact reads; on Windows the newlines became CRLF on disk and read_config_with_signature() — whose contract is returning the exact bytes on disk — correctly returned them, failing 3 of 10 tests. The fixtures now use write_bytes(...) and the stat-stale test appends in binary mode; no product change. (#6042)

2.1.0 — 2026-09-24

This section accumulates work toward the 2.1.0 milestone (2.1.0). This release closes that milestone with 772 merged pull requests.

⚠ Breaking changes

• gateway: Request trace ids are now issued unconditionally, and every Gateway HTTP response carries an X-Trace-Id header. Previously both were gated behind logging.enhance.enabled, which now controls log output only — whether records carry a trace_id field, and in which format. The header cannot be turned off; installations running the default enabled: false will start seeing it after upgrading. Scheduled tasks, MCP task notification runs, IM channel messages, and the embedded DeerFlowClient bind an id per unit of work, so the id also reaches the run record, the checkpoint metadata, and Langfuse traces that previously had none. A deerflow_trace_id supplied in a run request's metadata or config.context is now ignored and overwritten so the response header, the logs, and the persisted run cannot disagree — send the X-Trace-Id request header to pin a correlation id across services. logging remains restart-required. No config keys were added or removed. (#5119)
• skills: Sandboxes now reserve /mnt/skills for managed enabled-only projections. DEER_FLOW_HOST_SKILLS_PATH and SKILLS_HOST_PATH are no longer used; Docker/AIO and hostPath deployments derive projection paths from DEER_FLOW_HOST_BASE_DIR. E2B operator mounts targeting /mnt/skills or any child path are skipped with a warning so they cannot shadow the managed projection; move extra E2B content to a different container path. User projections re-read global enable state from disk so toggles propagate across Gateway workers on the next sandbox acquire. Existing E2B sandboxes retain their creation-time snapshot until they are recreated. PVC-backed provisioner deployments still mount the operator-supplied PVC snapshot directly, so disabled-skill filesystem isolation does not apply in PVC mode until dynamic PVC materialization is implemented. (#4178)
• sandbox: E2B now enforces sandbox.replicas as a process-local capacity limit. The default wait policy waits for acquire_timeout, then fails the agent turn. DeerFlow does not retry the turn automatically. Use burst with burst_limit to permit bounded extra VMs. The reject policy can remove one warm VM before it returns a capacity error. (#4391)
• skills: A directory containing SKILL.md is now a runtime package boundary. Nested SKILL.md files inside that package are supporting data and are no longer registered as independent skills; unusual custom layouts must move independently loadable skills under a namespace directory without its own SKILL.md. (#4098)
• memory: The memory system is now pluggable (memory.manager_class selects a backend; default deermem is self-contained). DeerMem-private settings moved from the top level of memory: into memory.backend_config, and the /memory/config response (and client.get_memory_config()) changed shape. (#4122)
• memory: /memory/config and client.get_memory_config() no longer return flat DeerMem fields (storage_path, max_facts, debounce_seconds, token_counting, guaranteed_*, staleness_*, ...). They return {enabled, mode, injection_enabled, manager_class, backend_config} where backend_config is an opaque dict the active backend self-interprets. Memory data responses (/memory, /memory/status data) are unchanged. External API/SDK clients reading the old flat fields must read backend_config instead. (#4122)
• memory: Custom memory.storage_class moved: the old default path deerflow.agents.memory.storage.FileMemoryStorage no longer exists (now deerflow.agents.memory.backends.deermem.deermem.core.storage.FileMemoryStorage). Custom MemoryStorage subclasses must accept config in __init__ (was no-arg). A broken/old storage_class logs an error and falls back to FileMemoryStorage (won't crash) -- update the path + signature to restore it. (#4122)
• memory: storage_path semantics changed from a FILE path to a root DIRECTORY. Pre-abstraction, an absolute storage_path was the shared memory file (opting out of per-user isolation) and a relative value was the global file under the data base_dir. Now storage_path (absolute or relative) is the root directory; per-user memory lives at {storage_path}/users/{uid}/memory.json. An upgrade keeping the old default storage_path: memory.json (a relative file name) would orphan per-user memory or hit NotADirectoryError on save, so the legacy migration drops file-style storage_path values (ending in .json) with a warning and the factory raises if storage_path resolves to an existing file. Set memory.backend_config.storage_path to a directory for a custom root. (#4122)
• memory: memory.mode: tool with a backend that does not implement search() now fails fast at Gateway startup with a ValueError from the MemoryManager invariant, instead of starting successfully and silently returning empty results on every memory_search call. Both shipping backends implement search() (DeerMem retrieves; noop returns []), so this only affects a custom backend that onboards without overriding search(). It is intentional -- silent empties are worse than a loud startup error. Fix: switch to mode: middleware or override search() (and set supports_search=True). (#4324)
• config: database.checkpoint_delta_snapshot_frequency moved to database.checkpoint_delta.snapshot_frequency and its default changed from 1000 to 10. A legacy top-level value is still honored with a deprecation warning and mapped onto the nested key (an explicitly set nested key wins). Deployments that relied on the old default now snapshot 100x more often in delta mode -- set database.checkpoint_delta.snapshot_frequency: 1000 explicitly to keep the previous cadence. (#4516)
• docker: The published entry port now binds to loopback (127.0.0.1) by default in both compose files, matching the documented local-trust deployment model. Deployments that relied on the old 0.0.0.0 binding must set BIND_HOST to expose the stack on other interfaces. (#4618)

Added

Scheduler

• scheduler: Scheduled tasks accept interval (schedule_spec.every_seconds) in addition to once and cron. Cadence is UTC now + N with no missed-beat catch-up. N is at least scheduler.min_once_delay_seconds (default 60s) and at most 30 days. (#5291)
• scheduled-tasks: Upcoming cron occurrences can be inspected before a task is saved. POST /api/scheduled-tasks/preview-cron takes a five-field cron expression, a timezone, a count of 1–10 (default 5), and an optional aware reference time, and returns the normalized cron, the effective UTC reference, and the occurrences in both UTC and local time. It runs the scheduler's own calculator in a worker thread, so DST handling matches what a saved task will actually do, and it reserves nothing and touches no task, thread, or run store; invalid input and date-range failures return 422. (#5381)
• scheduled-tasks: Run history can be filtered server-side by occurrence status. Finding a rare failure used to mean downloading every history page and filtering in the client, since a failure behind many newer successes could sit on any page; GET /api/scheduled-tasks/{task_id}/runs now accepts ?status= with queued, launching, running, success, failed, skipped, and interrupted, applying the predicate before pagination so ?status=failed&limit=50&offset=0 returns the first page of real failures. Unknown values, including the parent task's own completed, return 422, empty results return [], and the unfiltered array response is unchanged. (#5384)
• scheduled-tasks: The scheduled-task detail pane can page backwards through execution records. It showed only the latest 50 even though the endpoint already supports limit and offset, so anything older was unreachable from the UI. Newer, Older, and Latest navigation now walk the history with localized page, loading, error, and retry states; each request fetches one row past the page to decide whether an older page exists rather than inventing a total count, a short final page disables Older, switching tasks resets to the latest page and cancels the obsolete request so a late result cannot replace the new task's history, and only the latest page polls. (#5363)

Authentication

• auth: Personal access tokens (PAT) for programmatic API access: POST/GET/DELETE /api/v1/auth/pats manage tokens (shown once, stored as SHA-256 digests); a default-deny route policy admits only the thread/run lifecycle routes, narrowed further by the token's threads/runs scopes, and any request dimension that carries cancel capability (?action=, multitask_strategy) additionally requires runs:cancel. (#5041)
• auth: Login throttling parameters are configurable via auth.local.max_login_attempts (default 5, min 2) and auth.local.lockout_seconds (default 300), resolved live so a config reload applies on the next login without a Gateway restart — the unblock path for deployments behind corporate proxies/NAT where many users share one egress IP. Defaults are unchanged. (#5110)
• settings: Account preferences survive a cleared browser or a move to another device. The notification toggle, default model, conversation mode, and reasoning effort are stored as independent (user_id, key) rows behind session-authenticated GET/PATCH /api/v1/auth/preferences, hydrated from the server before first paint, with a tab-local outbox and capped-backoff retry so a failed write is not silently dropped; null resets a field. Only those four allowlisted fields are transmitted — device notification permission, display settings, and thread-specific model overrides stay local, and an automatic composer fallback is never uploaded as an explicit account preference. Existing unscoped local settings are not migrated, since they carry no known owner, so users reselect these four once after upgrading. (#5397)

Agents & runtime

• scheduler: Scheduled tasks can pin assistant_id to lead_agent (the default) or a custom agent the owner already has. Unknown or malformed names return 422. The workspace create/edit form exposes the same choice. (#5286, #5288)
• gateway: GET /api/threads/{thread_id}/runs/page walks thread run history with a (created_at, run_id) keyset cursor ({data, has_more, next_before_created_at, next_before_run_id}). GET /api/threads/{thread_id}/runs still returns a bare array of the newest 100 runs so LangGraph SDK clients keep working. (#5282, #5283)
• middleware: New TokenBudgetMiddleware enforces a per-run token budget, shared additively across the lead agent and subagents. (#3412)
• middleware: Structured tool-result metadata and a tool-progress state machine give the runtime first-class visibility into multi-step tool flows. (#3601)
• context: Record the effective memory identity per run and persist durable context (system messages, memory, and tool state) across summarization, emitting it as structured runtime metadata so compaction no longer drops it. (#3556, #3887, #3906)
• runtime: Goal continuations let a run resume toward a goal across multiple agent turns, with continuation_count tracked and capped. (#3858)
• subagents: A system-maintained delegation ledger prevents redundant re-delegation of an in-flight task, and a total delegation cap bounds fan-out per run. (#3877, #4115)
• subagents: Persist and display subagent step history in the thread. (#3845)
• tools: Structured synopses replace raw oversized tool output in previews. (#3377)
• files: Deterministic read-before-write version gate for file tools prevents clobbering concurrent edits. (#3912)
• gateway: Cache-aware cost accounting attributes token costs to cached vs. uncached paths; a Redis stream bridge enables distributed event streaming; and manual context compaction is exposed to the user. (#3920, #3191, #3969)
• gateway: The stream-bridge heartbeat interval is configurable via stream_bridge.heartbeat_interval_seconds (default 15s), so deployments behind aggressive proxy idle timeouts can tune SSE, /wait, and internal subscribers together. (#5017)
• runtime: Dual-mode checkpoint storage with LangGraph DeltaChannel cuts thread storage from O(N²) to near-linear for long research/coding runs. (#4292)
• runtime: Delta-mode checkpoint history cache (memory/redis) with O(1) incremental composition, configured via database.checkpoint_cache. (#4638)
• agent: Config-declared lead-agent middlewares let deployments add custom AgentMiddleware classes without patching the runtime chain. (#3964)
• agents: Per-agent model and generation settings (temperature, max_tokens, thinking_enabled, reasoning_effort) override the shared model profile. (#4347)
• runtime: Record terminal artifact-delivery receipts so runs expected to present_files no longer report success when delivery fails. (#4365)
• uploads: Lazy-load historical files via a list_uploaded_files tool instead of injecting the full manifest. (#4174)
• scheduler: scheduler.recursion_limit in config.yaml sets the LangGraph super-step cap for scheduled runs (default 1000, matching the web UI's interactive budget, clamped by max_recursion_limit). (#4848)
• runtime: Every tool call now carries a runtime-stamped, tamper-evident tool receipt, and a bounded receipt ledger is injected into the model context so agents can cite execution evidence in their reports. Enabled by default via the new verification config section. (#4659)
• subagents: Subagent delegations are now verifiable, layering RFC #4651: every subagent's report contract requires citing tool receipts (e.g. [r3 write_file]) and attaching a verifiable handle to each deliverable, the lead agent cross-checks those citations against the subagent's actual execution record, and acceptance_criteria on a task delegation are checked deterministically parent-side (file existence/non-emptiness, recorded test-command exit status) with anything undecidable reported UNVERIFIED instead of silently passed. (#5076, #5090, #5109)
• clarification: Human-input (clarification) cards support structured form fields, so an agent can request exactly the input it needs instead of free text only. (#4406)
• subagents: Built-in subagents now receive the current-date context anchor, so delegated tasks involving relative dates behave like tasks the lead agent handles directly. (#4797)
• subagents: A Settings page manages a deployment-level Subagent catalog (admin-managed worker definitions alongside built-in and config.yaml ones), and Custom Agents can restrict delegation to an explicit worker allowlist enforced at both prompt and execution time. (#4887)
• subagents: Subagent concurrency is now governed by one process-wide capacity controller, and an opt-in batch_task tool runs large collections of independent items as durable, resumable SQL-backed batches with leases, bounded retries, pause/resume/cancel, and a chat panel for tracking progress. (#4998)
• agents: The current-date context injected into lead- and subagent prompts honors the optional DEER_FLOW_DATE_TIMEZONE env var (IANA name, e.g. Asia/Shanghai), so users in non-UTC deployments are no longer told the wrong "today" around midnight; unset keeps server-local behavior. (#5154)
• subagents: Delegated subagents can discover files uploaded in earlier turns: the parent run's validated uploaded_files boundary seeds the subagent's graph state, making list_uploaded_files eligible for normal tool-policy filtering (durable batch_task workers keep it disabled). (#5170)
• agents: The read-before-write gate now elides the dead payload of a blocked write_file / str_replace call (content, old_str, new_str) from model-bound requests. A blocked call never ran and must be re-issued after a re-read, so the original arguments only cost context; stored history, receipts, and the run journal keep them. Blocked results are paired with call occurrences (tool-call ids may repeat across turns), and a request whose history was rewritten drops OpenAI resp_ response ids so use_previous_response_id chaining cannot resume the original server-side history. Controlled by read_before_write.elide_blocked_payloads (default on) and read_before_write.elide_min_chars (default 2000). (#5329)
• agents: ToolOutputBudgetMiddleware now also elides the content of a successful write_file call from model-bound requests once the same path was read or modified again later in the conversation. After a successful write the file on disk is the source of truth, and the read-before-write gate forces a read_file before the next modification, so the historical copy was redundant with that read and long report-writing runs carried every section twice. The newest tool_output.keep_recent_writes successful writes (default
  1. always stay visible, str_replace payloads are never touched, and stored history, receipts, and the run journal keep the original arguments. Controlled by tool_output.elide_superseded_writes (default on) and tool_output.superseded_write_min_chars (default 2000). (#5374)
• agents: Custom Agent config.yaml accepts memory_enabled: false to run an agent as a stateless execution worker; omission defaults to true. The opt-out removes only that agent from the memory lifecycle — recalled-memory injection, passive capture, the memory_search / memory_add / memory_update / memory_delete tools, and tool-mode memory guidance are all suppressed, and both automatic summarization and manual /compact skip the durable memory flush. Switching an existing agent off clears only the frozen, server-tagged memory reminders from checkpoint state: date reminders, real user messages, and untagged lookalikes survive, and the global memory setting is unchanged for every other agent. (#5167)
• runtime: ToolProgressMiddleware's interventions become auditable in the durable run-event stream. A new middleware:tool_progress event is persisted for each effective warn, block, recover, or later-invocation reset phase transition; previously those replanning hints, tool-state promotions, and short-circuits disappeared into process logs, so a persisted run could not show whether the model recovered on its own or the runtime guard intervened. Only bounded decision metadata is recorded — status and recovery vocabularies derive from the canonical tool_result_meta schema, and tool arguments, result content, prompts, and content-derived hashes never enter the event. Subagent and other recorder attribution keys are server-owned at both the Gateway and embedded-worker boundaries, so a caller cannot forge durable attribution. Events appear only when ToolProgress is enabled, which remains off by default. (#5214)
• subagents: Durable batch_task items accept the same optional acceptance_criteria that ordinary task delegations already take, so a batch worker can no longer claim a missing deliverable exists and still land as a succeeded item with no recorded check. Criteria are normalized before persistence (20 usable entries, 500 characters after neutralization; empty becomes null) and preserved across lease recovery, and a completed execution reuses the existing deterministic checker against owner-scoped thread files and recorded test-command evidence. Item queries and JSONL exports gain nullable acceptance_criteria and a separately validated acceptance_verdict (holds, does not hold, or UNVERIFIED): a completed item with a report, a missing CSV, and an unsupported quality claim stays succeeded with those three leaves and is not retried automatically. Items without criteria and legacy rows report no verdict. (#5289)
• subagents: task(context_mode="snapshot") lets a delegation carry a dispatch-time copy of the retained parent conversation, instead of the delegated prompt alone. Snapshot mode captures conversation content and summary_text after delegation validation and before child setup, so a rejected delegation serializes nothing and later parent edits never reach the child. It is rendered as a separate historical HumanMessage ahead of the task, keeping plain text, text blocks, historical tool-call descriptions with their matching results, and serializable media input; unserializable media becomes an explicit omission notice, while parent system messages, hidden framework state (injected memory and todo state included), reasoning blocks, execution metadata, and pending tool calls are excluded. The child keeps its own role, model, tools, and skill restrictions, and parent tool frames never enter its execution history, so parent actions cannot populate child receipts, execution steps, or bash evidence. context_mode="isolated" remains the default, and batch_task items still require self-contained prompts. (#5367)
• context: Opt-in task notes and compacted-history recall, gated by task_continuity.enabled (default false; the config schema gains the section with disabled defaults). Enabling it exposes task_note, history_search, and history_read to standard lead agents and DeerFlowClient under the existing authorization and skill policies, with both sync and async tool execution. task_note keeps short checkpointed notes of constraints, decisions, failed attempts, and next steps in a shared state channel that enforces notebook limits and report shape on every write, rendered as escaped historical data in the durable-context human message. Automatic and manual compaction additionally preserve bounded message and tool text — including genuine hidden clarification-card answers — into a user/thread-local SQLite FTS5 archive outside the sandbox mount, which history_search and history_read then query; malformed checkpoint metadata is reported as unavailable instead of aborting a model call or compaction, and a storage failure leaves ordinary compaction working. This is lexical recall within one task: it does not resume runs, replicate archives across hosts, or create cross-thread memory, and it adds no embedding dependency. (#5382)
• gateway: Gateway runs no longer hardcode a recursion limit of 100. A deployment whose normal tasks need longer agent loops had to make every API caller supply a request-level override, and a caller that did not hit GraphRecursionError on otherwise valid work. A hot-reloaded top-level recursion_limit now supplies the default when a request omits it (100, for backward compatibility), an explicit request value still wins, an invalid request value falls back to the configured default, and max_recursion_limit caps both configured and client-supplied values. (#5390)
• gateway: A Gateway run can be asked to read a specified earlier conversation. Opt-in read_conversation plus a conversation_references run field (up to three thread ids or same-origin chat URLs) grant the lead agent a model-facing read of a previous conversation while it continues the current task; ordinary message text never confers access, and the grant is bound to that run's references, the run's runs:read permission, and ownership of each source. Reads reuse the existing transcript pagination and visibility rules, returning bounded user and assistant text with source ids, continuation cursors, and truncation or unavailability notices while excluding hidden context, reasoning blocks, and raw tool results. The reader is never persisted in configuration and is released when the run ends, so resume and replay need the references again; bootstrap, subagent, and ordinary embedded paths do not receive it. Text is capped at 4,000 characters per message and 20,000 per page. (#5399)
• gateway: Conversation references can be sent by SDK clients and detected by them. The LangGraph JS SDK's RunsClient.stream drops unknown top-level fields, so a browser client could not send the conversation_references field at all, and it had no way to tell whether the reader was enabled — leaving no way to hide an entry point where it was off. Run create, stream, and wait requests now accept context.conversation_references with the same bounds (at most three, each 1–2048 characters) and the same error locations, lifted into the canonical field before validation and removed from context so it never reaches the run context or the checkpointed configurable; sending both spellings returns 422, and a copy left in body.config still grants nothing. GET /api/features reports conversation_references: {enabled, max_references}, where enabled follows the configured tool list so a config.yaml change takes effect without a restart. (#5463)
• tools: list_uploaded_files accepts optional query (a case-insensitive filename substring) and extensions ("pdf" or ".PDF", both meaning .pdf), and both filters run before the 20-file truncation that lazy-loading history already applied. Previously the cap hit the unfiltered mtime-sorted list, so "analyze those PDFs I uploaded before" in a thread full of newer screenshots pushed the PDFs into omitted_summary and left the agent with no path to hand read_file; total_count, truncated, and omitted_summary now describe the filtered set. Omitting both parameters keeps today's behavior, the two filters combine with AND, blank or invalid values count as no filter, and a filtered miss returns No uploaded files matched the given filters.. (#5341)
• agents: Custom Agents showed their ASCII-only storage identifier in the gallery, chat header and welcome page, so an owner could not label an agent in Chinese or any other non-ASCII script. Each agent can now carry an optional display_name — whitespace-trimmed, at most 100 characters — on its config document and through the create/update/read/list APIs; omitting the field on an update preserves it, and null or a blank value clears it. The label is edited from the agent gallery's settings button, counts Unicode code points against a visible budget, and is rejected when it holds control characters, invisible formatting characters, or nothing but marks, separators or format characters — ordinary multilingual text and ZWJ emoji stay allowed. Paths, URLs, the runtime agent_name, ownership and React identity keep using the stable identifier, so nothing needs migrating, and an invalid stored value is ignored on read rather than breaking list/detail/bootstrap. (#5324)

Memory

• memory: Memory consolidation synthesizes fragmented facts, and a staleness review prunes silently-outdated facts using LLM-assigned per-fact expected_valid_days / staleFactsToExtend. (#3996, #3860, #4143)
• memory: Guaranteed injection of correction facts (with graceful fallback) so user corrections always reach the model. (#3592)
• memory: Slim the pluggable MemoryManager interface for backend onboarding - new backends no longer implement unused abstract methods, and DeerMem-specific hook injection moves out of the shared factory. (#4326)
• memory: Incremental agent-scoped Markdown fact storage isolates per-agent facts and updates a single fact without rewriting or reindexing the whole collection. (#4279)
• memory: Memory message processing adds a conversation watermark, trivial-turn filtering, and a durable queue so extraction no longer re-feeds the full conversation every turn. (#4447)
• memory: A built-in FTS5/BM25 retrieval adapter provides full-text search over stored memories without an external retrieval service. (#4360)
• memory: New pluggable memory backends: OpenViking and mem0 over HTTP, plus Honcho as a user-model memory provider. (#4509, #4528, #4730)
• memory: A hybrid fact eviction policy blends multiple signals when deciding which stored facts to drop as memory fills. (#4789)
• memory: Opt-in write-side guard against storing paraphrases of a fact that is already remembered, so repeated extraction no longer consumes memory capacity and prompt tokens with duplicates. The write-side gate is memory.backend_config.fact_dedup_enabled (default false), with memory.backend_config.fact_dedup_similarity_threshold (default 0.7, range 0.5–1.0). Within the current user/agent scope a new same-category fact is compared against existing ones with bounded token-Jaccard similarity over Latin words and Chinese bigrams — a lexical heuristic, not semantic equivalence detection. A merge keeps the existing fact's id, content, and creation time, raises confidence to the higher of the two, and refreshes source only when confidence increased; the facts_merged_dedup counter records how many merges happened. Paired correction replacements bypass near-dedup, removal proposals exclude their own targets from matching, and no confirmation signal is fabricated — reinforcement still requires a genuine human message. (#5254)

Skills

• skills: The built-in image-generation skill can use OpenAI-compatible Images APIs for generation and reference-image editing, with configurable endpoint, model, size, and output format. (#5389)
• skills: Native SkillScan (phase 1) statically analyzes skill packages at load, and describe_skill enables deferred discovery so the model fetches a skill's schema on demand instead of loading all skills up front. (#3033, #3775)
• skills: Per-user custom skill isolation with sandbox mounting. (#3889)
• skills: The skill list reopens after a skill is selected, so several skills can be attached in a row. (#4639)
• skills: Install local .skill archives directly from the Skills settings page, reusing the existing per-user installer and security scan. (#5039)
• skills: Podcast-generation Volcengine voices are configurable per speaker gender, with trimmed blank-safe defaults. (#5156)
• skills: Custom skills can be exported from Settings, disabled ones included, so what you back up, move between installations, or send a teammate is the version actually installed rather than the original upload. A bilingual preview lists package size, paginated file paths, declared requirements, and actionable blockers, and the two new admin-only manifest and download endpoints bind that preview to a revision digest — a package changed in between returns 409 instead of a stale ZIP. Supporting files, empty directories, and normalized executable permissions survive the round trip, while links, special files, nonportable paths, nested skill roots, and executable binaries are rejected. Export copies raw saved files and is not a redaction step: it neither scans for secrets nor runs skill scripts, so credentials and account settings must still be configured separately. (#5332)
• skills: Deferred skill discovery ranks candidates instead of matching the model's whole free-text query as one regular expression. With skills.deferred_discovery: true the agent sees only skill names and calls describe_skill to choose what to load, but a multi-term intent had to match contiguously: chart visualization never found chart-visualization, and analyze Python never found a skill described as "Analyze data with Python, pandas, jupyter" — so the agent could not load the matching workflow or its active tool policy. Lookup now normalizes Unicode, case, and name separators and scores candidates by literal intent-term coverage, with name matches outranking description-only matches at equal coverage and catalog order breaking ties so results stay reproducible; model-generated queries are bounded to 256 characters and 16 unique terms. select: exact selection and +required name filtering are unchanged, and no embeddings, model calls, or telemetry are involved. (#5369)

Models & integrations

• community: New web search/fetch engines - GroundRoute, Crawl4AI (web_fetch), and a fastCRW provider - plus a Browserless web_capture screenshot tool and Brave image_search. (#3675, #3821, #3585, #3881, #3866)
• mcp: Per-server tool_call_timeout for MCP tool calls, and routing hints that guide the model to the right server. (#3843, #4004)
• mcp: Add an official OpenViking /mcp example that exposes the native tool set through DeerFlow's generic MCP client. (#4745)
• community: Agentic browser control as a first-class thread capability - Playwright-backed browser sessions the agent operates while the user observes or takes over from the workspace. (#4187)
• community: Lark/Feishu CLI integration bundles the runtime install, the official lark-* skill pack, and an interactive auth flow so the integration is no longer environment-dependent. (#3971)
• integrations: Lark/Feishu app credentials can be switched per user from Settings > Integrations: new App ID/Secret values are validated before anything is committed, and the previous OAuth token is revoked after a successful switch. (#4703)
• acp: MiniMax Code (mcode acp) is supported and documented as a native external coding agent, and ACP thought chunks are no longer concatenated into tool results. (#4846)
• models: A Z.AI GLM-5.3-Flash profile keeps thinking permanently enabled and stops generic reasoning-effort forwarding, since the model rejects disabled thinking and only accepts its own effort values. (#5074)
• community: New web search providers - Serply (with news and scholar verticals) and Tencent Cloud WSA - plus native recency filters (day/week/month/year) shared across DDGS, Brave, Tavily, and SearXNG. (#5023, #5057, #5099)
• community: New Sofya web_search and web_fetch provider - search results carry the content of each page, capped per result so a default search stays inline. (#5239)
• knowledge: Opt-in read-only RAGFlow retrieval exposes a knowledge_search(query) agent tool over configured RAGFlow datasets, with a dataset-ID allowlist and credential/dataset-id redaction on error paths. (#4955)
• knowledge: Opt-in read-only LightRAG retrieval is an alternative knowledge_search(query) provider for the same knowledge group — operators pick RAGFlow or LightRAG by which entry is configured. It queries LightRAG's structured /query/data endpoint (no LLM generation), formats the ranked chunks as citation-numbered text, redacts the optional X-API-Key on every model-visible path, and maps server error messages to actionable tool errors. (#5209)
• models: A per-user favorites layer keeps frequently used models reachable without changing the selected or default one. The compact two-line model list is now an anchored dropdown in both the main chat and Side Chat, with an inline star per row; favorites sort into the first group without selecting a model or closing the picker, and persist per signed-in user with cross-tab synchronization and restoration of temporarily unavailable entries. The existing search field is removed as a deliberate simplification, with no separate management mode. (#5441)
• models: Bounded concurrency does not bound request rate: several concurrent runs could still exhaust a provider's requests-per-minute allowance, and nothing paced the demand before dispatch, so a 429 was the first signal anything was wrong. A new optional models[].request_admission block admits model calls through a process-local queue, taking requests_per_minute (required), an optional group (defaults to the model config name), max_wait_seconds (default 300) and max_queue_size (default 256); at 60 RPM admissions land at least a second apart, and idle periods accumulate no burst credit. One bounded FIFO is shared across synchronous callers, independent asyncio loops and every model instance in an explicit group, whose policies must be identical — a conflicting setting fails construction and needs a restart. Cancellation and timeout drop a waiter without consuming an admission, and a full queue fails before dispatch. The limiter attaches through the LangChain BaseChatModel hook, so agent models, the invoke and stream paths and factory-created auxiliary models are all covered, and the factory strips the policy from provider kwargs and sets the exposed SDK max_retries to zero so retries cannot silently bypass the hook — existing agent middleware retries re-enter admission, while non-middleware callers lose SDK retries. Budgets are per process, so an operator must partition an account allowance across workers, replicas and other clients; the limiter counts requests, not tokens, and unconfigured models behave exactly as before. (#5432)

MCP

• mcp: A durable task runtime for MCP: long-running tool tasks survive Gateway restarts through a durable driver, and their progress and completion notifications surface in the chat UI. (#4665, #4690, #4833)
• mcp: Shared MCP servers can inject per-user credentials: a single server entry authenticates each DeerFlow user with their own header value, unmapped users are denied by default, and stored credentials are masked in Gateway API responses. (#4868)
• mcp: Per-server tool_name_prefix option lets servers that already namespace their own tools keep their original tool names; the default behavior is unchanged. (#4624)
• mcp: Settings > Tools can add, edit, and delete MCP servers through targeted Gateway endpoints, with a copy-paste JSON workflow that preserves advanced fields and masked secret placeholders. (#5022)
• mcp: Shared HTTP/SSE servers can map request-scoped secrets to headers via headers_from_context: callers supply per-request values in config.context.secrets, the config stores only key names, and missing values deny by default. (#5010)
• mcp: An optional parallel-search server entry (https://search.parallel.ai/mcp, HTTP, no auth by default) ships in extensions_config.example.json, disabled by default; enabling it exposes parallel-search_web_search and parallel-search_web_fetch, with optional Bearer authentication documented. (#5028, #5501)

Channels

• channels: Expose the IM channel_user_id to sandbox commands as DEERFLOW_CHANNEL_USER_ID. (#3926)
• channels: Queue rapid same-thread messages and preserve topic-card previews across batches. (#3988)
• channels: Inbound webhook deduplication moves to Postgres, so several Gateway pods can serve the same IM channel without double-processing events. (#4210)
• channels: DingTalk inbound messages support file and image attachments. (#4423)
• channels: New Buzz (Nostr) channel connector, including the frontend experience for the channel. (#4649, #4727)
• channels: /agent list and /agent use <name> IM commands let a conversation switch to the owner's Custom Agents: the selection is persisted in thread metadata (restored after restart) and wins over stale channel defaults, IM-created threads route through the same agent when opened in the web UI, and /agent is reserved across the slash-skill parser, frontend, and TUI so no skill can shadow the command. (#5168)

Auth & guardrails

• auth: Generic OIDC/SSO authentication with Keycloak support. (#3506)
• guardrails: Authenticated runtime context is exposed in GuardrailRequest, and security interventions are persisted as run events. (#3665, #3837)
• auth: "Keep me signed in" login option with a centralized session-cookie policy (persistent Secure cookies on HTTPS, session cookies on public HTTP). (#4255)
• auth: Deployments can close local self-registration to restrict new accounts to SSO/OIDC provisioning. (#4311)
• authz: Built-in RBAC authorization provider with a unified factory, plus tool-authorization enforcement at both assembly (tools removed before the model sees them) and runtime (denied calls blocked). (#4260, #4370)
• authz: Gateway route permissions are derived from the configured AuthorizationProvider rather than a fixed table. (#4439)
• authz: Model authorization is enforced at Gateway routes and again in the agent runtime, and sandbox:execute is checked when a sandbox is acquired - users can no longer reach models or sandboxes they are not authorized for. (#4540, #4911)
• authz: GET /auth/me now surfaces the caller's effective route permissions (RFC #4063 Phase 4), read from the AuthContext the auth middleware already stamps on every authenticated request — no extra provider evaluations — so the frontend can hide actions the caller's role cannot perform. (#5228)
• authz: A role denied threads:delete or runs:cancel was still shown the thread-row Delete menu item, the sidecar delete button and an enabled composer stop button, so the UI offered an action the Gateway's @require_permission guard would only reject. The frontend now consumes the effective permissions GET /auth/me reports and hides the delete affordances, and disables the stop button while streaming with an aria-label/title naming the permission boundary. Enforcement is unchanged — the Gateway guards remain the single decision point — and an absent, null or not-yet-loaded permission list is treated as permissive, so a mixed old-backend/new-frontend deploy can never hide an action the caller can still perform. (#5294)

Sandbox & provisioner

• sandbox: New E2B and BoxLite (micro-VM) sandbox providers; BoxLite ships with a warm pool. (#3883, #3940, #3951)
• provisioner: ClusterIP Services and scoped per-skill PVC mounts, plus a configurable sandbox container port. (#4016, #3928)
• sandbox: New cloud sandbox providers: Tenki and OpenSandbox. (#4382, #4877)
• sandbox: An optional lark-cli credential broker sidecar (K8s provisioner mode) keeps Lark app secrets and OAuth tokens out of the sandbox filesystem entirely - the sandbox sees only a shim that forwards commands to a loopback broker in the pod. Off by default. (#4501)
• sandbox: The E2B mount-upload wall-clock deadline is configurable via mount_upload_deadline_seconds (default 120s). (#4876)
• sandbox: An E2B sandbox carries a structured MountUploadResult (truncated, reason, upload totals) after creation — preserved across warm-pool reclaim within the process — so mount truncation by a resource limit is observable in code instead of only in Gateway logs. (#4884)
• sandbox: Opt-in controlled egress for local Docker AIO sandboxes: sandbox.network.mode supports isolated (per-sandbox internal bridge with no outbound route) and allowlist (the same bridge plus a domain-allowlist HTTP(S) policy sidecar that resolves destinations itself and rejects IP literals and ECH); denied public domains can be approved through the Human Input card (temporary grant or allow-for-this-sandbox), non-interactive runs fail closed, and the sandbox API is no longer published directly in restricted modes. Requires Docker Engine 28+; open remains the default. (#5152)

Extensions & plugins

• extensions: An out-of-tree Python extension system: extensions can contribute middleware, task-lifecycle and system-model observers, Gateway services, and HTTP routers, and are managed with deerflow extensions install/enable/disable/remove. (#4636, #4684, #4780)
• extensions: Extensions can observe what the agent did - message provenance, middleware policy declarations, agent-assembly fingerprints, context-compaction records, guardrail decisions, and the MCP origin of a tool. deerflow-extension-api moves to 0.2.0; extensions written against 0.1 are refused at startup with an install hint. (#4863)
• extensions: An extensions.middlewares entry may be {class, kwargs} in addition to the existing module.path:ClassName string, and kwargs is passed to the constructor. Operator-managed middleware that needs a threshold, a header name, or any other argument no longer has to ship a hardcoded subclass just to set one value. String entries still construct with no arguments, blank class paths are rejected at config validation instead of failing later at agent creation, and unknown fields such as apply_to are refused. (#5312)
• extensions: deerflow extensions upgrade SOURCE (also exposed as make extension-upgrade SOURCE=...) replaces a managed local snapshot, or re-pins a requirement already in the extensions group, and adopts the existing plugins: record so its private config and required survive. Moving to a newer pin used to mean remove then install, and remove deletes the whole record — secrets included — while an already-snapshotted local directory could not be reinstalled at all without editing the managed copy by hand. Plain install is unchanged and still refuses an existing local snapshot, upgrading a source that is not installed fails closed with an install hint, and a failed upgrade restores the previous snapshot even when a concurrent pyproject.toml / uv.lock edit blocks dependency-file rollback. (#5347)
• extensions: A new optional RunEvidenceReader contract lets a Gateway extension learn what changed since it last looked, instead of reconciling whole threads: a host-owned monotonic cursor drives durable changed-run discovery, alongside scoped per-run event paging and authoritative status reads. Cursors are opaque, versioned, scope-bound, replay-safe, and durable for database-backed stores; paging orders by (change_seq, run_id) rather than inferring global order from thread-scoped event sequences or timestamps; progress snapshots and lease heartbeats do not advance the clock; and deletions emit no tombstone, so consumers poll status and treat a missing run as absent. Existing extensions are unaffected because ExtensionRuntimeDeps.run_evidence_reader defaults to None, and a store that cannot serve a page fails explicitly rather than reporting a misleadingly empty one. The production reader is app-scoped with global cross-user visibility for trusted operator extensions; it redacts event metadata but leaves content unchanged. (#5405)

Persistence

• persistence: A custom PostgreSQL schema can be selected via postgres_schema; ORM, LangGraph checkpointer, and store tables are all created there, and the schema is created automatically at startup. (#3442)

Frontend

• frontend: Branching support for assistant turns and side conversations for quoted follow-ups. (#3950, #3934)
• frontend: Regenerate the latest answer. (#3637)
• frontend: Citation-sources evidence panel, workspace change review for agent runs, and a visualized ask_clarification card. (#3907, #3945, #3956)
• frontend: Voice dictation, prompt-history recall with arrow keys, composer input polishing, and a "(thought for N seconds)" thinking-duration chip. (#4036, #3718, #3986, #3627)
• frontend: Feature-gate the agents UI behind the agents_api flag, and persist AI turn duration in backend and UI. (#3769, #3663)
• frontend: Render slash-skill activations as inline chips. (#3981)
• frontend: Localized AI-assistance disclaimer. (#4374)
• frontend: Pin recent chats. (#4442)
• frontend: Validate /goal objective length in the composer. (#4337)
• frontend: Real-time context window usage is shown as a conversation grows. (#3183)
• frontend: The latest user turn can be edited and rerun in place. (#4377)
• frontend: Replies can be typed and sent while a clarification card is pending. (#4530)
• suggestions: The number of follow-up suggestions is configurable via suggestions.max_suggestions (default 3). (#4533)
• artifacts: Text artifacts can be edited inline in the artifact panel. (#4596)
• artifacts: Markdown artifacts open rendered in a new-window reader (with "View source" and "Download" fallbacks), and all files presented in a run can be downloaded as one zip archive derived from the run's delivery receipt. (#5056, #5117)
• frontend: Browser Live is available in Custom Agent chats. (#4719)
• frontend: A conversation outline navigates long chats: past 5 user turns, a compact side menu lists the conversation's questions and jumps between them, tracking the current section. (#5025)
• frontend: Scheduled tasks can be duplicated into an editable draft that carries over the configuration but not the run history. (#5064)
• threads: Branched conversations get distinguishing titles (automatic Title (2), Title (3) sibling numbering) and the recent-chats list shows parent-child lineage with tree connectors. (#4983)
• frontend: Chats can be archived and restored: an Archive sidebar action with an Undo toast, Recent chats / Archived tabs above search, and per-chat restore controls; SQL and Memory stores apply the archive filter before pagination while messages, files, links, pin state, and the current URL are preserved. (#5236)
• projects: Project workspaces organize chats (Projects MVP Phase 1): a sidebar Projects section with flat/grouped list modes, a project detail page with a paginated thread list, project-scoped new chats whose threads are pre-created with their project so a run can never land outside it, branch membership inheritance, move-between-projects, and project create/rename/archive/restore/delete. (#5265)
• artifacts: Completed CSV/TSV artifacts preview as bounded tables (up to 200 rows × 50 columns, 50 rows per page, sticky headers, optional first-row header) parsed off the main thread over the existing 1 MiB range loader — literal strings, leading zeros, and multiline quoted cells survive, long cells open in a copyable dialog, and source view remains one toggle away. (#5284)
• title: Attachment-only first turns get a real title instead of the generic New Conversation, so file-first conversations are distinguishable and searchable. When the first turn carries one validated attachment, the cleaned filename becomes the local title; several attachments produce a count such as 2 files uploaded; user-authored text still wins as the title source, and New Conversation remains the fallback when no valid filename is available. The local title is returned before the configured title-model path, so an attachment-only turn no longer pays for an LLM call. Filenames are read only from the uploaded_files state the upload middleware populated — client metadata is not trusted — and are sanitized: control characters and excess whitespace stripped, ordinary Unicode and percent signs preserved, long names truncated while retaining the extension. This supersedes the New Conversation fallback the earlier <current_uploads> title fix deliberately kept. (#5304)
• projects: Projects MVP Phase 2 makes a project do its job rather than just name a folder. Project instructions — previously stored, editable, and read by nothing — now reach the model on every member-thread run as a bounded, user-role <project> block in that run's request only, never the system prompt or persisted history, with renames taking effect on the next run and oversized text rejected at write time rather than truncated. A per-project document shelf gains a Documents tab (upload, list with provenance, preview, download, move-to-trash, content-hash dedup) that the agent reads on demand through list_project_documents / read_project_document — registered only in project runs, text only — plus promotion in both directions: Save to project copies any thread file onto the shelf with provenance, and Attach to thread ingests a shelf document back into a conversation through the normal upload pipeline. A read-only conversation-files view aggregates member threads' uploads and outputs, and project deletion finally has a trash tier. (#5443)
• frontend: Tool details for generic and MCP calls are inspectable in debug mode. Those steps previously showed only a label even though the browser already receives their inputs and results, making it hard to see what was passed between tools. Token Usage → Debug now carries a collapsed Tool details panel — including for calls with no token statistics — showing tool name, call ID, input, and either the original result or an explicit error, with copy actions and English/Chinese labels. Content is formatted only when expanded, and text length, nesting, and visited values are bounded so a large payload cannot stall the panel. (#5309)
• frontend: Conversations can be referenced from the composer. A "Reference a conversation" button sits beside the attachment button, rendered only while /api/features reports the capability, and opens a picker over the same recent-conversation list the sidebar uses — never offering the current conversation, and capped at the reported max_references (3 today), where rows past the cap are disabled and selected ones stay clickable to remove. Attached conversations appear as removable chips in the composer and as read-only chips linking back to the source in the transcript. References are per message: not saved with a draft, cleared on send or thread change, and regenerating or editing a turn runs without them unless re-attached. (#5465)
• frontend: Capability management moves out of Settings into a dedicated Capability Center in the workspace sidebar. MCP servers, connected-app authorization, and skills sat alongside account and appearance preferences, which made them hard to find and made the settings dialog hard to scan; they now live on one page, with Plugins combining MCP management and Lark/Feishu install and authorization, and Skills providing Built-in, Community, My skills, and All skills views with searchable cards, enable switches, file import, creation, and custom-skill export. Settings keeps its seven remaining sections, API contracts and permissions are unchanged, and the old ?settings=tools|integrations|skills entry points are removed. (#5468)

Observability & tooling

• observability: Trace-id correlation with enhanced logging and agent observability via Monocle. (#3902, #4024)
• tooling: A Hermes-like terminal workbench (deerflow CLI) backed by DeerFlowClient, plus a redacted community support-bundle generator. (#3760, #3886)
• setup: The setup wizard now asks whether OpenAI-compatible gateway models support thinking, and a Volcengine Coding Plan quick-setup path was added. (#3428, #4141)
• tui: clear command. (#4306)
• tui: The TUI supports a transparent terminal background. (#4631)
• gateway: New GET /health/ready readiness probe runs a bounded database SELECT 1 and returns 503 while the database is unreachable (200 not_configured for the memory backend); /health stays pure liveness, and the production compose healthcheck now gates on readiness. (#5166)
• observability: Deferred tool promotions — both routing-hint auto-promotion and explicit tool_search — persist as privacy-minimal middleware:tool_promotion run events (tool names, source, count, agent attribution; no queries, schemas, or results), observed only after skill-policy filtering so denied schemas are never reported as effective promotions. (#5183)
• client: Context compaction stores its result in ThreadState.summary_text, outside messages, but the embedded client's values event selected only the title, messages and artifacts — so a consumer outside the Gateway, such as a benchmark runner, had no way to observe the summary through the public event stream. Every embedded values event now carries summary_text, None when absent, forwarding updates, repeats and clears as state snapshots. Message serialization, AI-delta deduplication, tool artifacts and usage accounting are unchanged, and no checkpoint internals are exposed. An initial snapshot can already contain a restored summary, so a changed value alone is not a causal compaction event. (#5249)

Changed

• frontend performance: Keep the public root and localized docs static; lazy-load closed workspace panels and editor/highlighter dependencies; incrementally derive streamed message state; bound streaming Markdown work; virtualize long message and chat lists; pause offscreen decorative effects; and enforce representative route JS/CSS budgets.
• browser: Negotiate binary Browser Live JPEG frames, retain the legacy JSON/base64 protocol for older clients, coalesce presentation to the latest frame per refresh, and revoke replaced object URLs.
• artifacts: Stream regular text artifacts with HTTP byte-range support and limit the initial Web UI preview to 1 MiB until the user explicitly loads the complete file.
• sandbox: The Helm chart now defaults per-sandbox Services to ClusterIP instead of NodePort, so the code-execution sandbox is reachable only inside the cluster via Service DNS (http://sandbox-<id>-svc.<ns>.svc.cluster.local) and is no longer bound on every node's interfaces - including the externally-reachable ones on GKE/EKS/AKS. Existing chart installs flip NodePort -> ClusterIP on upgrade. To preserve the old reachability (an external probe hitting the 30xxx port, or the Docker-Compose/hybrid path where the gateway is not in K8s), set provisioner.sandboxServiceType: NodePort (with provisioner.nodeHost if needed). The provisioner itself is unchanged (mode-aware since #4016). (#4190)
• skills: An active restrictive skill must explicitly list task in allowed-tools to delegate to a subagent. Read-only discovery infrastructure (tool_search and describe_skill) remains available, but cannot grant schema visibility or execution for a denied business tool. (#4098)
• memory: Pre-abstraction top-level memory.* DeerMem fields (storage_path, max_facts, debounce_seconds, model_name, token_counting, staleness_*, consolidation_*, ...) are auto-migrated into backend_config on load with a warning, so an upgrade does NOT silently revert customized settings to defaults (model_name -> backend_config.model.model). Move them under memory.backend_config in config.yaml to silence the warning. (#4122)
• memory: Added memory.mode (middleware | tool); tool mode registers memory tools (memory_search/add/update/delete) the model calls directly instead of passive per-turn summarization. manager_class resolution is now fail-fast (raises ValueError on an unknown backend instead of silently falling back). (#4023)
• middleware: Declarative layered middleware builder; ThreadData now runs before Uploads. (#3809)
• sandbox: The host->virtual output-masking regex now has a single owner, eliminating duplicated pattern compilation. (#4108)
• docs: AGENTS.md is now the source of truth for agent guidance, imported by CLAUDE.md via @AGENTS.md; module guides refreshed. (#3770)
• memory: The OpenViking memory backend now uses the official OpenViking adapter; the old trusted-mode auth_mode/account fields are rejected in favor of a credential-bound USER API key. (#4707)
• gateway: Threads created before the run-event journal have their checkpoint history backfilled as seed events before the first new run, so legacy conversations stay visible and correctly ordered after an upgrade. (#4590)
• agents: Subagent delegation is now routed by net benefit: the lead agent defaults to direct execution unless parallel latency, specialist capability, or context isolation clearly pays off. (#4384)

Fixed

• frontend: Keep the … (kebab) menu on project chat rows inside the sidebar. In the sidebar's grouped Projects mode the indented nested menus kept SidebarMenu's w-full while carrying an extra ml-4, so they were 100% of the width plus 16px and their absolutely positioned right-1 action landed past the sidebar edge — clipped on active-project rows and pushed out entirely on the doubly indented rows under the Archived group, while the flat chat list (the only unindented menu) was unaffected, which is why it slipped through. Both nested menus now use w-auto, so the block-level flex container fills the remaining width minus its margin. No behavior, data, or API change beyond the layout fix. (#5682)
• persistence: Heal databases that silently skipped the run-change clock schema. 0023_run_change_seq was inserted ahead of the already-shipped 0023_user_preferences revision, so databases stamped at that revision (or later) treat it as an applied ancestor and never execute it — leaving the run_change_clock table and the runs.change_seq column permanently missing, and the first thread deletion (any run-store change-clock bump) fails with no such table: run_change_clock. The new 0025_repair_run_change_seq revision re-applies the same guarded DDL on upgrade and no-ops on healthy shapes. RunChangeClockRow and UserPreferenceRow are also registered in the ORM model registry so create_all and autogenerate see every table through explicit imports instead of module side effects. (#5517)
• backend: Validate pagination on the LangGraph-compatible POST /api/assistants/search. limit and offset were applied directly through Python slicing, so invalid values such as offset: -1, limit: 0, or an excessive limit returned 200 with misleading results instead of being rejected at the API boundary. limit is now required within the compatible range of 1–1000 and offset must be non-negative; invalid requests get 422. (#5506)
• models: Guard the Claude Code credential loader against a malformed claudeAiOauth container. ~/.claude/.credentials.json can hold a syntactically valid JSON payload whose claudeAiOauth value is not an object — a null left by a partial export, a raw string, an array, a number — and the extractor called .get on it, raising AttributeError out of ClaudeChatModel.model_post_init and aborting model construction, the opposite of the loader's documented degrade-gracefully behavior (the sibling Codex loader already guarded the identical shape). A non-object top-level payload or claudeAiOauth value now logs at debug level and counts as "no credential from this source", so loading falls through to the next source and ultimately returns None when every source is unusable. (#5494)
• events: Preserve the DB write-lock generation across thread deletion. DbRunEventStore serializes per-thread sequence assignment with an asyncio.Lock, and delete_by_thread() evicted that lock whenever lock.locked() was false — but asyncio.Lock.release() clears the locked state before a queued waiter resumes, so a deletion landing in that handoff window removed the registry entry while an admitted waiter still referenced the old lock. A later writer then created a new lock generation for the same thread, and two writers could proceed under different locks, violating the single-process serialization around max(seq) + INSERT. The per-thread registry is now weak, so an admitted holder/waiter keeps its lock generation discoverable until it drains, while a separate strong pin preserves the existing stable one-lock-per-thread behavior; deletion retires only the pin. (#5462)
• setup: Honor a custom sandbox image in BOM-prefixed configs. setup-sandbox.sh matched ^sandbox: against a first line still carrying its UTF-8 BOM, never matched, and silently chose and pulled the default image instead of the configured one, although the runtime YAML loader accepts the same configuration. The script now strips a UTF-8 BOM at the beginning of the first line before the image-selection pipeline, with no new runtime dependency. (#5515)
• gateway: Keep the shutdown run drain alive across repeated cancellation. _drain_inflight_runs() shielded the RunManager.shutdown() task and then awaited it again, but a second Task.cancel() while that second shield was pending interrupted the helper itself, letting the lifespan continue unwinding while run tasks were still draining — reopening the exact resource-ordering hazard the drain exists to prevent: run tasks could still be writing checkpoints after checkpointer teardown began. The helper now keeps the already-started shutdown task strongly owned and repeatedly shields it until it reaches a terminal state, remembering the first caller cancellation and propagating it only after the bounded drain completes. Logging and error behavior on a failing drain are unchanged. (#5487)
• models: Pair Codex invalid tool calls with their tool results. A Codex model that emits a function_call whose arguments are not valid JSON does not fail the turn: the call is parked on invalid_tool_calls and answered with a placeholder ToolMessage by DanglingToolCallMiddleware, so the model sees a recoverable tool error. But the Codex Responses serializer emitted input items for valid tool_calls only, so the placeholder reached the provider as a function_call_output whose call_id had no matching function_call in the same request, and the Responses API requires the pair — the exact case the middleware exists to recover from ended in a provider error instead of a retry. Chat Completions providers already replay invalid calls through LangChain's converter, and the OpenAI-compatible path had the same failure class repaired in the middleware; Codex requests now also replay invalid_tool_calls as function_call input items next to the valid ones. The valid-call path, the parse side, and the middleware are unchanged. (#5509)
• nginx: Stop thread routes that wait on a model call from failing at 60 seconds. The browser calls /api/threads/* directly, and that location had no proxy_read_timeout, so nginx's 60-second default applied while /api/langgraph/ allowed 600. A slow /compact returned 504 while Gateway kept going and still saved the compaction, so the UI showed an error for work that had been applied, inviting a retry that compacts it again. /suggestions hit the same limit, and /runs/wait cancelled its run when nginx dropped the connection. The Docker, local, and Helm configs now allow 600 seconds on that location. (#5505)
• middleware: Stop loop detection from cutting off an agent that pages through a file. read_file calls were keyed by 200-line buckets, so every read shorter than a bucket collapsed onto its neighbours: five sequential 40-line reads hashed identically and tripped the hard stop, ending the run with a forced final answer and stop_reason=loop_capped — on exactly the ranged reads read_file's own truncation notice tells the model to make. The key now uses the exact line window, with an omitted end_line kept open-ended so a bare read and an explicit start_line=1 still share one key. Repeating a single range is still caught at the same threshold, and a read loop that varies its bounds remains covered by the per-tool frequency layer. (#5486)
• subagents: Give max_turns the meaning operators read it as. It was handed to LangGraph as recursion_limit, which counts super-steps — one per graph node — while create_agent compiles a node for every middleware lifecycle hook, so one turn cost seven to eight steps through the subagent chain and the built-in general-purpose agent's max_turns=150 bought about 18 tool-using turns before failing as turn_capped. Every middleware added to the chain shrank the effective budget again. The executor now scales the configured turn count by the per-turn node count of the chain it actually assembled, so raising max_turns buys the turns it names. No config keys changed; existing max_turns values now grant their full budget, which can make a previously truncated subagent run longer, bounded as before by subagents.timeout_seconds and subagents.token_budget. (#5485)
• scheduler: Enforce the global max_concurrent_runs budget on SQLite, which previously only held on Postgres. Claiming a queued occurrence counts the executing rows and then promotes one row to launching, and Postgres serializes that pair with an advisory lock. SQLite's deferred transaction reserved the writer only at the promoting UPDATE, so claimants racing on distinct rows — a manual trigger overlapping the poller, or a second Gateway process sharing the database file — all read the same stale count, all passed the budget check, and the configured cap was exceeded. (#5469)
• sandbox: Stop AIO's glob from reporting an exactly-full result as truncated. Its include_dirs branch returned as soon as it had collected max_results matches, so a listing that held exactly that many — and no more — came back flagged as cut off, and the tool told the model the result was incomplete. That branch already holds the whole listing, so it now looks one match past the cap before deciding, matching the sibling include_dirs=False branch, which has always decided from the full list. This concerns the filtered-match cap only: the raw-output cap parse_remote_search_output owns is a separate limit with its own one-line-past accounting, and the other providers' filtered-match cap is unchanged. (#5449)
• middleware: Stop a guard that removes tool calls from breaking every later turn of a Claude or OpenAI Responses thread. Token-budget and loop-detection hard stops, subagent-limit truncation, and safety suppression cleared tool_calls but left the provider's own tool-call blocks in the message content. Anthropic and the Responses API resend those blocks, so the next request carried a tool call with no result and the provider rejected it, and a hard stop saved to the checkpoint kept failing on each new message. All guards now remove the matching content blocks through one shared helper, which also keeps a Responses call that clarification retains. (#5447)
• sandbox: Stop remote glob and grep from reporting "no matches" when their output was cut off. BoxLite, Tenki, E2B, and OpenSandbox cap the search's raw output and then filter it in Python (ignored directories such as node_modules, the pattern or glob scope), but they reported truncated only when max_results was reached. When the capped lines were all filtered out, a search with real matches past the cap came back empty and complete. The search now passes one line beyond its cap so a cut-off result is reported as truncated, and the glob and grep tools say an empty truncated result is incomplete instead of "No matches found". (#5427)
• sandbox: Stop host paths reaching the model when output joins them with :, as $PATH and $PYTHONPATH do. The matched path ran on through the rest of the list, so every later entry under the same root was left unmasked; extra masking passes recovered one entry each, which hid the leak for short lists. Masking now ends a matched path at :. A symlink inside a mount whose target lies outside every mount is now shown by its mount path instead of the target's host path in command output and glob results. (#5418)
• sandbox: Stop BoxLite grep from ignoring the directory part of glob. It compared only file names, so src/*.js matched every .js file in the tree. The glob now applies to the path relative to the search root, the same scope as glob() and the other providers. (#5419)
• models: Stop every Claude model after the first from losing its credential when the Claude Code OAuth token is handed off through CLAUDE_CODE_OAUTH_TOKEN_FILE_DESCRIPTOR. Every ClaudeChatModel instance loaded credentials again, but a descriptor can be drained only once, so the title, summarization, and subagent models — and every later run — had no credential and failed with TypeError: Could not resolve authentication method. The token is now read once per process and reused. (#5411)
• models: Stop the lead agent from failing to build whenever a model with supports_reasoning_effort: true also gets a reasoning_effort from its profile — at the top level, in when_thinking_enabled or when_thinking_disabled, or from the extra_body.thinking disable path. The regular lead-agent build forwards the requested effort even when unset, so the key reached the provider constructor twice and raised TypeError: got multiple values for keyword argument 'reasoning_effort'. The requested value now layers like per-agent model_settings: it replaces a top-level profile value, an unset request keeps that value, and the thinking-mode settings still decide the final one. Codex keeps its own level check. (#5403)
• runtime: Stop a keyed run retry from failing with 500 on the SQL run store. HTTP admissions do not pass a user_id; the SQL store stamps the request user on the row, but the process-local run record kept None. A retry with the same Idempotency-Key that reached another Gateway worker, or the same worker after the finished run was cleaned up, compared the two owners, took its own run for another user's, and raised. The same mismatch dropped HTTP runs from owner-scoped history reads and skipped the MCP background_tasks projection for them, so values events for these runs now include background_tasks. RunManager now resolves an omitted owner from the request user the way the SQL store does, so every store records the same owner. (#5401)
• runtime: Stop a cross-worker idempotent run reuse from permanently blocking the thread on the reusing worker. The reuse registered the hydrated store row as a local run record, but only the owning worker finalizes and cleans up its records, so the copy kept its admission-time pending/running status forever: every later reject admission for that thread on the worker returned 409 until a restart, its run reads kept reporting the stale status, and orphan reconciliation skipped the run if the owner crashed. A cancel sent to that worker also took the local-owner path and marked the owner's still-running row interrupted. The reusing worker now returns a detached store-only handle instead, so cancel follows the non-owner contract. (#5393)
• skills: Stop writing resolved secrets into extensions_config.json when a skill is toggled. The Gateway skill toggle and DeerFlowClient.update_skill loaded the file through ExtensionsConfig.from_file(), which replaces every $VAR value with the environment value, and wrote that model back — so a "$GITHUB_TOKEN" reference was persisted as the plaintext token and an unset variable was permanently replaced with "". DeerFlowClient.update_mcp_config did the same for every key other than mcpServers. These writers now edit the raw on-disk JSON and validate the candidate the way the runtime loads it, so placeholders and hand-written structure survive; the MCP router shares the same raw loader. Files rewritten by an earlier toggle keep their plaintext values: restore the $VAR references and rotate the exposed credentials. (#5357)
• gateway: Honor disable_clarification and github_token only for internally-authenticated callers, the way non_interactive already was. Both keys were forwarded from body.context regardless of the caller and were not scrubbed from the free-form body.config that the run config copies verbatim, so any session or PAT caller could set them. disable_clarification is the stronger of the two: ClarificationMiddleware answers every clarification — risk_confirmation included — with "proceed without asking", and SandboxMiddleware reads it as the same non-interactive signal as non_interactive. github_token reached runtime.context, where the bash tool exports it as GH_TOKEN/GITHUB_TOKEN, and a copy smuggled through body.config['configurable'] was persisted in the checkpoint store. The scheduler, IM channels, and the GitHub webhook channel authenticate over the internal request channel and are unaffected. (#5338)
• artifacts: Keep PUT /api/threads/{id}/artifacts/{path} confined to /mnt/user-data/outputs. The outputs-only guard was a string-prefix check on the raw path, so a percent-encoded .. (outputs/%2e%2e/uploads/x.txt) — which nginx forwards untouched and Starlette decodes — passed it, and the resolver only confines to user-data/, letting a caller overwrite a sibling upload or workspace file in their own thread. Dot segments are now collapsed before the prefix check, and the resolved host path is re-checked against the resolved outputs root so a symlink planted inside outputs/ cannot redirect the write either. The rule now lives in one shared helper that IM-channel attachment delivery uses as well, so the two copies cannot drift. (#5321)
• gateway: Stop persisting a caller-supplied deerflow_trace_id on the run record. body.metadata reaches both the live run config, which the run worker restamps, and the run record echoed verbatim by the runs API; only the first was covered, so a client could make the most durable surface of a run disagree with the X-Trace-Id and the log lines from the same request. The id is now stamped once at the trust boundary, config.context is closed off the same way, and a thread's own metadata is no longer seeded with the run-scoped id of whichever run created it. (#5119)
• gateway: Expose X-Trace-Id in Access-Control-Expose-Headers. It is not CORS-safelisted, so split-origin browser clients — the ones that cannot read the Gateway's logs either — could not read the correlation id they are meant to quote in a bug report. (#5119)
• gateway: Keep X-Trace-Id on unhandled-exception 500s. Starlette's ServerErrorMiddleware emits those through the raw send outside every user middleware, so the 500 for a server bug — the response most in need of correlation — was the only one shipped without the id. TraceMiddleware now sends its own 500 carrying the header before re-raising; the server's exception logging is untouched and mid-stream failures propagate unchanged. This fallback is emitted outside CORSMiddleware and stays CORS-opaque, so split-origin browser clients cannot read the id on this one response — same as the ServerErrorMiddleware 500 it replaces. (#5119)
• gateway: Strip a forged deerflow_trace_id from the persisted request echo. body.config is stored verbatim as runs.kwargs_json and served back by the runs API, so a forged id in config.metadata or config.context survived on that one surface while every other carried the real id. redact_config_secrets now drops the key from both containers, and build_run_config merges run metadata onto a copy so the server-stamped id can no longer be written through into the caller's request body. (#5119)
• artifacts: Keep explicit full-file loading scoped to the source thread, so a same-path artifact in another conversation keeps its 1 MiB preview. (#4634)
• sandbox: SandboxAuditMiddleware no longer blocks ordinary command substitution that only captures output. The rule now judges position instead of matching any $(: x=$(curl url), echo $(curl url), an argument, and a for word list all run normally, while a substitution in command position ($(curl url), after a |/&&/;, behind leading assignments or an env/nohup/time style wrapper, or as an eval/source argument) still blocks because it executes fetched content. An interpreter's code-string flag (bash -c, python -c, perl -e, node -p, php -r, and the <<< here-string) is treated as an execution context wherever it appears, so bash -c "$(curl url)" blocks; source <(curl url) and the backtick spelling of eval/source now block too, neither of which was detected before. An unquoted newline separates statements like ;, so echo hi followed by a new line starting $(curl url) blocks as well, while heredoc bodies are consumed as data — writing a file whose content happens to start a line with $(curl url) is not a command. Variable expansions whose name merely starts with a risky executable ($shell, $bashrc, $python_version) and lookalike binaries (shellcheck, shasum) are no longer false positives. (#4611, #4623)
• mcp: Isolate Settings > Tools enable/disable updates to one MCP server, so an unrelated disallowed stdio command no longer blocks every switch; allow disabling a disallowed target while still rejecting its re-enable, preserve the raw extensions config, honor the MCP-spec transport alias when enabling SSE/HTTP servers, surface backend validation details in the UI, and atomically replace the shared config for MCP, skill, and embedded-client updates so interrupted writes cannot leave it truncated. (#4574, #4577)
• runtime: Thread metadata now switches to running only after the run passes the startup barrier, so pending-cancelled runs no longer briefly project running; clients may observe the prior thread status during worker startup. (#4450)
• runtime: Re-check orphan candidates through an atomic, lease-aware takeover claim so a successful heartbeat after the scan keeps the run active and only one reconciler reports recovery. (#4424, #4434)
• skills: Apply allowed-tools only to slash-activated or actually loaded lead-agent skills, preventing passive enabled skills and evaluation fixtures from removing MCP, web, file, and delegation tools from every run. (#4095, #4098, #4192)
• models: Honor api_base on every BaseChatOpenAI subclass (VllmChatModel, MindIEChatModel, PatchedChatMiMo, PatchedChatStepFun, PatchedChatMiniMax), not just ChatOpenAI / PatchedChatOpenAI. Those five previously dropped the configured endpoint silently and then failed every request with an opaque unexpected keyword argument 'api_base'; the unknown-config-key warning was disabled for them as well. Both now gate on issubclass(BaseChatOpenAI). (#4146)
• agents: Coalesce SystemMessages before the LLM request; ensure a visible response after tool runs; avoid a default LLM title call before stream end; reserve ellipsis room so the local title respects max_chars; and snap the tool-output tail forward so fallback truncation respects max_chars. (#3711, #4033, #3885, #4052, #4017)
• agents: Skip dateless reminders in the dynamic-context date scan; load SOUL.md from agent dirs without config.yaml; require config.yaml in update_agent's legacy-agent guard; and refuse empty SOUL.md updates. (#3685, #4136, #4166, #4219)
• middleware: Window the loop-detection tool-frequency counter so long runs no longer false-trip; prevent the title middleware from streaming tokens; fix positional fallback consuming an unrelated todo when the same-content list is exhausted; acquire the token-budget lock across _apply, before_agent, _clear_run_state, and _drain_pending_warnings; drop orphan ToolMessages so strict providers don't 400; sanitize invalid tool-call arguments; and recover from empty tool-call names and malformed tool-call ids in dangling repair. (#4072, #3566, #3709, #3714, #4080, #4193, #4008, #4246)
• subagents: Inherit LoopDetectionMiddleware and summarization middleware so tool loops break and steps are captured; surface the turn-budget cap as MAX_TURNS_REACHED with a partial result; unify guardrail caps on the additive stop_reason + token_budget; inject durable context before compaction; preserve the parent checkpoint namespace; prohibit the task tool in the general-purpose system prompt; re-buffer subagent events on flush failure to avoid losing steps; and fix the lost loop_capped stop reason when a subagent's run_id is None. (#3931, #4009, #3949, #3980, #4040, #4215, #4161, #4082, #4059)
• memory: Harden against null/empty edge cases - skip whitespace-only facts; coerce null confidence / source.confidence in updates, searches, and the three remaining raw reads; treat explicit null backend_config values as omitted; fix KeyError / UnboundLocalError when a fact has no id or the facts list is empty; stop the busy-spin in the debounced update queue; and flush the memory queue on graceful shutdown to prevent loss. (#3719, #4074, #4076, #4034, #4217, #3993, #3992, #4073, #4181)
• runs: Close multi-worker ownership gaps in run atomicity; fail-stop local execution when lease renewal cannot be confirmed before its deadline and fence late completion writes after peer takeover; degrade cancel to lease takeover for multi-worker; keep create_thread idempotent when the insert loses a race; read stop_reason from runtime context; and persist run duration in checkpoints for history reads. (#4003, #4064, #4414, #3800, #4188, #4118, #4431)
• runtime: Serialize SQLite event-store writes to prevent per-thread sequence collisions; skip hidden human messages in the journal; and drop the silent delta-discard in _merge_stream_text. (#4077, #3698, #4085)
• gateway: Attach thread-message feedback by real event_type; offload blocking filesystem IO in artifact serving, gateway uploads, and the Discord channel; limit the uploaded-file context manifest; and live-tail malformed Redis reconnect ids. (#3651, #3551, #3935, #3927, #3917, #4012)
• uploads: Claim the converted-Markdown companion filename before writing it, so two convertible uploads sharing a stem (or a convertible plus a same-stem .md upload) no longer silently clobber each other within one request. When uploads.auto_convert_documents is on, the companion .md now gets a unique name (e.g. a_1.md); POST /threads/{id}/uploads and DeerFlowClient.upload_files both report the actual name in markdown_file. (#4288)
• config: Coerce null object config sections to their defaults; honor the unified database configuration in the store and sync checkpointer; and have legacy DB backfill create missing Index objects on existing tables. (#3573, #3904, #3994, #4090)
• models: Apply the stream_chunk_timeout default to all BaseChatOpenAI subclasses; and normalize api_base -> base_url for ChatOpenAI with a warning on unknown config keys. (#4102, #3790)
• mcp: Isolate tool-discovery failures per server; synchronize the session-pool singleton lifecycle; invalidate the tools cache on config content
  • path (not just newer mtime); validate MCP tool names at load so deferred prompts stay inert; and route tools by source server, not name prefix. (#3772, #3797, #4124, #4154, #3812)
• skills: Activate a slash skill once per run, not per model call; close the skill-install security-scan coverage gap; recognize fully deleted skill packages in review CI and remaining requests / httpx methods as network sinks in SkillScan; reuse the resolved app config in the no-arg skills prompt section; and reload mounted skills without restarting the Gateway. (#4103, #3924, #4169, #4130, #4160, #4264)
• sandbox: Guard the reverse path-translation and output-masking regexes with segment boundaries; handle one-sided line ranges and empty files in read_file / str_replace; align the AIO bash working directory; use os.sep in the reverse-resolve containment check on Windows; normalize Windows backslash paths in bash commands; stop glob / grep / ls from surfacing disabled skills' files; and allow valid heredoc commands in the sandbox audit. (#4035, #4053, #4078, #4079, #4051, #4058, #3869, #4096, #3786)
• sandbox: Synchronize the sandbox provider singleton lifecycle (with concurrency regression tests) and keep k8s calls off the event loop in the provisioner. (#3730, #3941)
• sandbox: Align sandbox artifact mounts with the channel user; fix local-dev (make dev) on non-root / NFS hosts; reap macOS nginx processes on stop; and fix production Postgres UV-extras detection in Docker. (#3729, #3590, #3828, #3897)
• channels: Validate the channel provider before resolving its config; dedupe GitHub webhook redeliveries and drop redundant GitHub review-comment webhook fan-out; scope the slash-skill whitelist check to the run's owner; batch Feishu file messages into one thread and dispatch Feishu group commands prefixed with a bot @mention; accept leading @mentions before /connect bind codes and don't treat a bare "connect" as a bind command; stop Feishu from creating thread topics and throttle card updates; let the UI runtime channel config win over config.yaml; fix require_mention gating on whitespace-only bot_login / mention_login; guard null quote fields in WeCom; and key inbound dedupe on chat-scoped workspaces so Telegram, Feishu, WeChat and DingTalk redeliveries stop re-running the agent on a default (unbound) configuration, releasing the dedupe key on transient failures so a redelivery can still recover. (#4100, #4104, #4131, #4129, #3753, #4229, #4222, #4251, #3810, #3674, #4055, #4069, #4287)
• frontend: Preserve messages and durable context across summarization; preserve artifacts and stabilize artifact paths during streaming; resolve relative artifact image paths; retain presented artifacts in the header dropdown; keep orphan tool messages visible; show assistant text during tool steps; reset new chat on client-side navigation; prevent stream cancellation on concurrent submit; fix stale-run reconnect and cancel handling; fix chat math rendering, single-tilde markdown, double reasoning rendering, UTF-16 markdown binary classification, and <memory> tags in Streamdown; make recent-chat rows fully clickable; validate attachment limits before upload and fix uploaded-file metadata in message copy; fix mobile workspace and accessibility blockers, the card tool-message bug, and side-chat toolbar / panel-button behavior; block unresolved suggestion-template placeholders; refresh notification permissions; show the branch action only for completed turns; enable regenerate in custom agent chats; and generate a fallback title for interrupted first-turn runs. (#3826, #3791, #4094, #4038, #3854, #3880, #4114, #3673, #3878, #3908, #3557, #4245, #3870, #3966, #4209, #3733, #3900, #3944, #3740, #3976, #3959, #3961, #3764, #3768, #4147, #3967, #3874, #3644)
• tui: Interrupt an active run before /quit exits. (#4235)
• harness: Don't flag the outline as truncated at exactly MAX_OUTLINE_ENTRIES headings. (#3856)
• tracing: Attach Langfuse trace metadata to the goal evaluator. (#4202)
• context: Resolve the context-compress bug. (#4065)
• threaddata: Fix AttributeError when runtime.context is None. (#3989)
• goal: Stop continuation_count double-bump during stand-down. (#4199)
• circuit-breaker: Stop wedging after a non-retriable half-open probe. (#3991)
• github: Match allow_authors logins case-insensitively. (#4218)
• community: image_search now returns the full-resolution image URL. (#3990)
• skills: Offload blocking filesystem IO in the skill-history endpoint. (#3563)
• skills: Don't treat a lazily evaluated PEP 695 type alias as a network sink in SkillScan. (#4315)
• skills: Bound skill-archive extraction by member count, not only by uncompressed size. safe_extract_skill_archive() is the always-on path every .skill install goes through; it capped total uncompressed bytes as a zip-bomb-by-size defence but had no member limit, so a small archive holding tens of thousands of tiny entries extracted cleanly. scan_archive_preflight() already capped entries at 4096, but only ran when the optional skill_scan.enabled kill switch was on, leaving the default path uncapped. Extraction now enforces the same 4096-member cap unconditionally, raising a plain ValueError; where SkillScan is enabled the structured package-too-many-members finding still surfaces first. (#4241)
• tracing: Resolve the Langfuse trace user from runtime context. (#3794)
• guardrails: Propagate internal owner attribution into the guardrail context. (#3839)
• subagents: Clamp the subagent limit consistently with MIN_SUBAGENT_LIMIT. (#4081)
• subagents: Load user-scoped skills. (#4356)
• mcp: Per-server fail-soft OAuth priming, and persist rotated refresh tokens. (#4084)
• mcp: Ignore malformed path-like text. (#4456)
• auth: Resolve email accounts case-insensitively. (#4101)
• auth: Recover from setup-status timeouts. (#4371)
• scheduler: Close a dispatch race that could launch two runs for one scheduled task. (#4105)
• channels: Buffer and drain GitHub comments queued during a busy run. (#4133)
• channels: Escape Slack reserved characters before mrkdwn conversion. (#4197)
• channels: Check response.success() on Feishu card/reaction SDK calls. (#4234)
• channels: Drop inbound DingTalk messages that carry no conversation identity. (#4316)
• channels: Receive inbound Telegram attachments. (#4392)
• memory: Consolidated facts inherit expected_valid_days from their sources. (#4225)
• config: Sync _memory_config with AppConfig auto-reload. (#4208)
• postgres: Harden the async engine with pool_recycle and command_timeout to stop stale-connection 504s. (#4230)
• harness: Add a timeout to invoke_acp_agent to prevent indefinite hangs. (#4238)
• community: Surface the target-page error status in web_fetch (Browserless). (#4239)
• sandbox: Widen the BoxLite/AIO tenant hash and verify identity on reclaim. (#4171)
• sandbox: Make an empty old_str a no-op in str_replace on any file. (#4256)
• sandbox: Serialize E2B release transitions. (#4355)
• sandbox: Bound E2B output-synchronization resources. (#4364)
• sandbox: Unwrap Overwrite-wrapped sandbox state in after_agent. (#4381)
• sandbox: Bypass proxies for local AIO traffic. (#4444)
• models: Surface length-capped model responses instead of dropping them. (#4309)
• streaming: Keep large file generation responsive. (#4354)
• streaming: Expose custom events to astream_events. (#4403)
• streaming: Signal replay history gaps. (#4426)
• summarization: Summarize with the run model and fall back on summary-provider failure. (#4361)
• runtime: Remove transient image context after model calls. (#4267)
• runtime: Stop subgraph stream frames from impersonating root frames. (#4407)
• runtime: Reject unsupported run options and stream modes. (#4430)
• runtime: Serialize checkpoint writes with active runs, linearize delta-mode checkpoint resume, and accept the SDK's default stream_resumable=false to avoid resume races. (#4437, #4460, #4468)
• checkpoint: Unwrap Overwrite first writes into empty channels. (#4383)
• nginx: Allow long chat prompts through /api/langgraph/ without a raw 500. (#4277)
• gateway: Prefer X-Trace-Id over metadata.deerflow_trace_id when the header is set. (#4283)
• gateway: Seed branch run-events so inherited history survives forking. (#4385)
• gateway: Scope branch-history seed run ids per inherited turn. (#4459)
• frontend: Harden artifact and markdown rendering. (#4117)
• frontend: Classify a symlink replacing a file distinctly from deleted in workspace-change review. (#4170)
• frontend: Offload blocking filesystem IO in the workspace-change text-cache lifecycle. (#4268)
• frontend: Encode artifact URL path segments. (#4278)
• frontend: Clarify run-duration display. (#4348)
• frontend: Preserve regenerate state in branched threads. (#4358)
• frontend: Default the reasoning-effort label to Medium when unset. (#4373)
• frontend: Strip and parse the <current_uploads> upload-context tag. (#4402)
• frontend: Keep leading orphan tool messages visible. (#4408)
• frontend: Keep completed subtask cards stable after reload. (#4432)
• frontend: Apply message-image maxWidth via inline style. (#4446)
• frontend: Restore resizing for the artifacts and sidecar panels. (#4469)
• frontend: Allow dev-server access from non-localhost hosts. (#4471)
• safety: Backfill empty content-filter responses so they don't poison the thread. (#4394)
• tools: Exclude injected runtime from the list_uploaded_files schema. (#4376)
• mcp: Bound MCP server bring-up — tool discovery (subprocess spawn + initialize + tools/list) and persistent stdio session initialization — with a new per-server session_init_timeout (default 60s, null disables), so a hung stdio server can no longer block agent construction, or the whole Gateway event loop, indefinitely. tool_call_timeout still bounds individual stdio tool calls. (#4657)
• runtime: Tool-output budget externalization no longer trips run delivery verification. The default .tool-results storage dir (and any custom tool_output.storage_subdir) is excluded from workspace-change snapshots and produced-artifact detection, so a run that only externalized oversized tool outputs succeeds instead of failing as an error. (#4657)
• frontend: Hide stale follow-up suggestion chips while a turn is still streaming. (#3396)
• frontend: Fix streaming render glitches: stop the word animation from replaying, keep step text stable, preserve message order during long runs, and keep reasoning above the answer. (#4266, #4510, #4513, #4578)
• frontend: Encode thread IDs in chat routes so IDs with special characters no longer break navigation. (#4302)
• frontend: Render citation links from React children. (#4486)
• frontend: Localize conversation export failure messages. (#4493)
• frontend: Sync side panel state when a drag collapses the panel. (#4556)
• frontend: Render one workspace-change card per run instead of duplicates. (#4559)
• frontend: Refresh the active artifact's content when it changes. (#4584)
• gateway: Reject non-positive read limits in API requests. (#4284)
• gateway: Handle a null config.configurable when resolving the thread id instead of failing. (#4301)
• gateway: Unify thread id validation across API routes. (#4589)
• gateway: Merge concurrent thread metadata updates instead of letting them silently overwrite each other's changes. (#4489)
• gateway: Expose the run metadata response header to cross-origin clients, so a split-origin frontend learns new run ids instead of staying stuck on the new-thread placeholder route until reload. (#4535)
• gateway: Replay edit and rerun from a settled checkpoint so the edited prompt actually runs (previously a first turn's edit replayed the original prompt and vanished after reload), and keep a manual rename through the rerun. (#4534, #4539)
• runtime: Cancel a run from any live gateway worker, not only the one that owns it, so the stop button no longer depends on request routing. (#4500)
• runtime: Close a replacement run when interrupt or rollback admission is cancelled mid-flight, instead of stranding an unseen active run on the thread. (#4472)
• runtime: Regenerating a response now preserves the thread's current title and supports the latest interrupted response whose partial message never reached a checkpoint. (#4480, #4524)
• agents: Classify web_fetch error pages such as 404s as errors rather than successful evidence, so retries and stagnation guards can react. (#4314)
• agents: Handle XML-to-dict option shapes when normalizing clarification choices. (#4527)
• subagents: Run delegated subagents with isolated callbacks and lazy skill activation, fixing cross-event-loop failures and passive skills stripping baseline tools like write_file. (#4497)
• sandbox: Handle overwrite-wrapped state when ensuring the sandbox is initialized. (#4429)
• sandbox: Reconcile E2B sandboxes safely: pick the first healthy candidate, adopt the canonical instance per user and thread, defer a peer's live duplicates, and reap orphans after a grace window. (#4443)
• sandbox: Claim ownership before destroying a sandbox that failed its readiness check, so a peer gateway can no longer adopt the not-yet-ready sandbox and kill a live turn. (#4505)
• sandbox: Allow grep to search a single file. (#4512)
• sandbox: Enforce the E2B capacity limit deployment-wide when sandbox ownership uses Redis, so multiple gateways cannot create past it. (#4575)
• skills: Activate managed integration skills from the managed integrations root on slash invocation. (#4570)
• skills: Offload blocking filesystem IO when updating a skill and serialize concurrent writes. (#3565)
• mcp: Ignore oversized path-like text. (#4582)
• memory: Harden long-term memory: reject duplicate facts inside the create critical section, truncate injected mem0 context on entry boundaries, and keep task-scoped instructions such as "inspect only" out of long-term memory. (#4599, #4600, #4604)
• scheduler: Keep a successfully launched scheduled run's slot and run id when post-launch bookkeeping fails, preventing a later dispatch from launching a duplicate run. (#4504)
• config: Treat a deleted extensions config file as absent instead of raising, so tool and skill config resolution keeps working. (#4275)
• config: Normalize the postgres:// short scheme for the async ORM engine. (#4293)
• console: Disable cost reporting when model pricing mixes currencies instead of reporting a meaningless cross-currency total. (#4564)
• browserless: Accept the timeout config key and harden its coercion. (#4519)
• docker: Send Connection: upgrade only when the browser requests it, fixing login-page refresh loops when the Docker dev stack is accessed via a remote host. (#4250)
• runtime: Group JSONL batch event writes by run, so a batch covering several runs no longer lands all events in the first run's file and makes later runs unreadable through per-run APIs. (#4938)
• runtime: Restore standalone LangGraph Studio compatibility: the graph entrypoint and file-based app load again, the Studio identity can discover system assistants, and the documented langgraph dev workflow works. (#4760, #4838)
• gateway: Stamp turn_duration on a run's last AI message only in /messages/page, so multi-step turns no longer repeat the same run lifetime as thinking latency on every intermediate message. (#4755)
• gateway: Preserve exact history attribution beyond the event page limit, so older AI messages on long-lived threads are no longer credited to a later turn's run and duration. (#4953)
• gateway: Reject MCP task cancellation with HTTP 503 when the task worker is stopped, instead of acknowledging a cancellation that would never run. (#4963)
• middleware: Correct four context-handling defects: fallback dynamic-context injection targets the latest user message instead of resurrecting an old prompt as the current turn; bare string blocks in list-form user content are sanitized like all other user text; duplicate placeholders are no longer emitted for the same invalid tool call; and summarization no longer compresses away the current request's user message while leaving the previous turn's behind. (#4667, #4668, #4693, #4882)
• middleware: Restore the system-prompt injection that teaches the model about the write_todos tool, which the todo middleware's model-call override had silently dropped. (#4735)
• agents: Make SQL agent-store signatures content-sensitive, so an agent update that reuses its previous timestamp no longer leaves the GitHub agent registry serving stale webhook routing. (#4709)
• tools: Resolve presented files with the runtime user, so present_files no longer rejects valid artifacts as outside the outputs directory when the request user context is unavailable. (#4677)
• tools: Retain a strong reference to deferred subagent cleanup tasks, so garbage collection can no longer destroy a pending cleanup and leak cancelled subagent records, locks, and memory. (#4928)
• subagents: Give every background subagent run a server-side execution ID, so concurrent runs that reuse a provider tool-call ID can no longer overwrite, poll, or cancel each other's state. (#4758)
• harness: Offload ACP workspace creation and MCP config loading from the event loop, so invoking an ACP agent no longer raises blocking-IO errors or stalls other async work. (#4965)
• mcp: Reject non-finite poll_after_seconds values on task snapshots when they arrive, so a bad polling interval no longer crashes scheduling and persistence after a successful poll. (#4750)
• mcp: Keep the configured grant_type authoritative over extra_token_params during OAuth token exchange, so extra parameters can no longer silently switch the configured flow and be rejected by the token endpoint. (#4860)
• runtime: A slow or hung stdio MCP server no longer stalls the whole Gateway. Agent construction assembled MCP tools synchronously on the event loop, so a wait for an in-flight MCP initialization blocked SSE delivery, run cancellation, and timers for every other request, not just the caller waiting for its tools. Tool assembly is now dispatched to a worker thread at each async entry point: the subagent spawn path in task_tool, SubagentBatchService._execute_item for durable batches, run_agent's agent factory (which covers both get_available_tools call sites in lead-agent assembly), and the checkpoint state-accessor build, whose cold-cache reads pay the MCP-init wait in the worker thread instead of stopping the loop. The four offloads ride a dedicated bounded pool (run_assembly() in utils/assembly_io.py, 8 workers, overridable with DEER_FLOW_ASSEMBLY_WORKERS) rather than the loop's default executor, so a worker parked for the full MCP timeout cannot queue every other to_thread caller behind it; contextvars are copied across the hop so the extension build-context snapshot still propagates, and pending assemblies are logged with a throttled warning once they exceed the worker count. Because assembly can now be parked, a durable batch re-checks its item's durable state immediately before launching, so a batch cancelled during assembly no longer starts a model call. (#5217, #5224)
• agents: LoopDetectionMiddleware no longer spends one turn's budget on another turn's legal work. It scoped its identical-call hashes and per-tool frequency windows only by thread_id, so a compiled agent reused across turns — DeerFlowClient retains the graph and assigns a fresh run_id per turn — counted earlier turns' ordinary calls toward the later turn's limit, producing a false loop warning on the third separate turn and stripping a legitimate tool call on the fifth at the default identical-call thresholds. State is now scoped by (thread_id, run_id), with evidence still accumulated across repeated graph entries inside one run, including hidden goal continuations, and independent warning queues for concurrent sibling runs. LRU eviction drops a whole run scope, reset(thread_id) still clears every scope that thread owns, and thresholds and warning/hard-stop behavior are unchanged. (#5344)
• agents: A run's token_budget.max_tokens cap now holds across the hidden continuations of an active /goal. The worker re-enters the graph under the same run_id, and the middleware cleared that run's usage in after_agent and then marked every existing message as already seen, so each continuation started counting from zero: with max_tokens: 10000, a turn that hit the hard stop at 12k was followed by a continuation that kept calling tools, and the run reported stop_reason: token_capped while spending 20k tokens and running two more tool calls after the cap. Usage and warning state now survive graph entries with the same run_id — as loop detection already did — while a later user run still gets a fresh run_id and a fresh budget. After a cap, a continuation still makes one model call before its tool calls are stripped. (#5410)
• middleware: A Human Input Card reply is now recognized as the user's current request. The card answer arrives as a hidden HumanMessage carrying a valid human_input_response, and the turn-detection helpers used is_real_user_message, which rejects every hidden message with no carve-out — so a run started from a card reply kept the older visible request as "current" while the answer itself was treated as a framework injection. In summarization, the current-request rescue therefore locked onto the stale message: after compaction the model saw the original request word for word and the user's region and year constraints only inside the summary. In McpRoutingMiddleware, a routing keyword that appeared only in the card answer matched nothing, so the deferred MCP tool was never auto-promoted and the model had to call tool_search by hand — the identical answer sent as a visible message promoted it, so behavior depended only on how the answer was transported. Both now use is_genuine_user_message, which skips hidden messages unless they carry a valid human_input_response; hidden messages without one still stay skipped. (#5416, #5426)
• goal: A goal that a token-capped run already satisfied is no longer followed by a pointless continuation. Now that continuations share the run's token budget, a continuation queued after the hard stop made one model call and then had its tool calls stripped, so it could not make progress — yet the worker still queued it, paying for an evaluator call and a model call each time until the continuation or no-progress limit stopped the goal. run_agent now passes the run's stop_reason into goal-continuation preparation, and when it is token_capped the goal stands down with stand_down_reason: "token_capped" instead of queueing another continuation. The evaluator still runs first, so a goal the capped run did satisfy is still cleared, and other stop reasons behave as before. (#5424)
• agents: A retried model call no longer reaches the provider without the warning a guard middleware had already queued for it. LoopDetectionMiddleware, TokenBudgetMiddleware, and ToolProgressMiddleware drain their queued warning or hint inside wrap_model_call before calling the handler; because LLMErrorHandlingMiddleware wraps them and retries by calling its handler again, the second attempt ran with an empty queue while the warning had already been marked sent. A model that looped on one tool call and failed once with a 503 on the request carrying the warning never saw it and ran on to the forced stop. All three now put the drained warnings back at the front of the queue when the handler raises, so the retry picks them up; successful calls are unchanged, per-run caps still apply, and warnings are still dropped at after_agent if the run ends without another model call. (#5433)
• agents: The token budget works again for runs that have no run_id — LangGraph Server, langgraph dev, and direct create_deerflow_agent callers. Two defects rode the runtime-local fallback key. A subagent's hard stop was stored under the id string but read back with consume_stop_reason(None), because SubagentExecutor propagates the parent's run_id and the parent has none, so a token-capped subagent was reported to the parent as a clean Task Succeeded instead of a capped failure. And LangGraph gives each node its own Runtime wrapper, so id(runtime) differed between after_model, the next wrap_model_call, and before_agent: the queued budget warning was never delivered, after_model missed the before_agent baseline and counted every AIMessage in the thread, and a second invocation on the same thread was charged with the first invocation's tokens. Invocations without a non-empty string context run_id are now keyed by LangGraph's run-scoped Runtime.control object, the same anchor loop detection uses, and the stop reason is stored under the context run_id exactly as given, None included. (#5436)
• agents: Cancelling a read_file or write_file call can no longer strand or release the read-before-write gate's lock. asyncio.to_thread() cancellation only cancels the asyncio waiter, not an already-running worker, so a cancellation could leave a queued threading.Lock.acquire() hanging or free the gate while an off-thread probe was still running. Dispatched gate operations are now drained under asyncio.shield() before the cancellation propagates, the first CancelledError is preserved and re-raised across repeated cancellations (including when the drained worker task is itself cancelled), a lock that succeeds after cancellation is released exactly once, and the same-path gate is held until the write-check and read-mark work finishes. (#5395)
• agents: Three create_deerflow_agent features now do what they advertise. Factory graphs were built without DurableContextMiddleware, which is what writes the delegations ledger — so SubagentLimitMiddleware always counted zero earlier delegations and only the per-response limit applied — and which is the only thing that puts summary_text back into a model request, so after the first compaction the model saw only the kept tail and the summary was lost. Separately, RuntimeFeatures(token_budget=True) built a TokenBudgetConfig() whose enabled defaults to false, so every hook returned early and there was no warning, no hard stop, and no token_capped. _assemble_from_features now always adds DurableContextMiddleware in the same position as the lead-agent chain, factory model requests carry the hidden durable-context block when the graph has a summary, delegations, or loaded skill files, and token_budget=True builds TokenBudgetConfig(enabled=True). (#5488)
• subagents: Subagent acceptance checks no longer let an out-of-scope command count as evidence on Windows. _cd_target_in_scope() normalized bash cd targets with the host platform's path module, so on Windows an absolute POSIX path or a .. escape could be judged a safe relative target and a test run outside the checked scope could satisfy an acceptance criterion. Bash targets and configured roots are now normalized with POSIX semantics on every host, drive-qualified Windows paths are recognized and compared case-insensitively, and an unmatched drive or directory fails closed. (#5162)
• sandbox: Concurrent subagents stopped working once their count passed the AIO image's shell-session ceiling. Each concurrent subagent gets its own persistent scoped shell, but the AIO image caps MAX_SHELL_SESSIONS at 10, so the eleventh shell evicted the oldest idle session while DeerFlow still held its scoped id — the subagent's next command then failed with 404 Session not found, and recreating sessions without raising the capacity only evicted another subagent and lost its shell state. New local containers now receive subagent_runtime.max_running + 1 (the extra slot leaves room for the lead shell) as MAX_SHELL_SESSIONS, provisioner mode forwards the same value to the sandbox Pod, and an explicit sandbox.environment.MAX_SHELL_SESSIONS set below the required capacity now fails at provider startup naming both values. When a scoped session is lost anyway — to a timeout or external cleanup — DeerFlow recreates it once, and only for the structured 404 Session not found response. (#5178)
• view-image: view_image no longer serves a stale or missing picture for a remote sandbox image. It resolved /mnt/user-data/... to a Gateway host path, so bytes only became available after synchronization and an older host copy could stand in for the current one. Bytes are now read from the current live sandbox when one is available, without acquiring a replacement merely because a persisted sandbox ID exists, and lightweight provenance — the exact SHA-256 plus the source sandbox ID — is recorded in viewed_images instead of checkpointing image bytes or base64. A replacement sandbox that reports the image missing falls back to the synchronized host copy only when it matches both the recorded size and SHA-256, so same-size stale content is rejected; missing-file classification is provider-neutral over an explicit __cause__ chain and deliberately ignores implicit exception context. Async tool invocation and model injection now run the blocking sandbox read through run_sync_lifecycle_operation(), so a cancellation cannot tear down sandbox lease cleanup before the read has drained. (#5306)
• subagents: A subagent keeps its instructions after its context is compacted. The executor builds the agent with system_prompt=None and puts the assembled prompt into state as the first message, so it holds the role prompt, the <report_contract> citation rules, the acceptance-criteria note, the skills index, and the deferred MCP tools and routing hints — and compaction cuts by index, so index 0 always fell in the summarized part. Every model call after the first compaction ran with no system prompt at all, and the summary did not stand in for it because it is injected as hidden data the authority contract tells the model not to follow. Dynamic-context preservation now rescues SystemMessages as well as tagged reminders and the latest user message, keeping their order so the prompt stays first and is not sent to the summarizer; when the prompt plus the current request are all that remains, compaction is skipped instead of summarizing the prompt away. The lead agent is unaffected — its prompt is the request's system message, not a message in state. (#5454)
• subagents: A repeatedly cancelled subagent no longer leaks its execution slot permanently. SubagentExecutionCapacity.slot() increments the process-wide running count before yielding and releases it in the async context manager's finally, but a second Task.cancel() arriving while that release was blocked acquiring the capacity lock interrupted the cleanup: the task exited cancelled with _running still incremented. With max_running=1, every later native subagent then queued until timeout or was rejected even though nothing was running, violating the documented invariant that cancellation and timeout release queue and slot ownership. The final release now runs in its own task, is shielded from caller cancellation, and is drained across repeated cancellation before the cancellation propagates. (#5477)
• worker: A delegated subagent's error no longer fails the parent run. When a subagent's model call ended in an error after its retries, the executor reported task_failed and the lead agent still answered, but the worker also saw the deerflow_error_fallback marker inside the root-level task_running custom event — each carries a subagent message with additional_kwargs — and marked the parent run error with the subagent's error text. Goal continuation stopped, and an edit-and-rerun rolled the thread back, discarding the edited question and the new answer. Custom frames no longer feed parent error-fallback detection, while the lead's own error fallback still arrives through values, messages, and updates frames; the parent run now ends success when the lead finishes. (#5407)
• sandbox: Normalize separators in masked output tails so virtual paths are spelled POSIX-style on Windows hosts too. Both output maskers searched for the host base in a forward-slash-normalized copy of the output but sliced the matched tail out of the original text, so nested backslashes survived into the spliced result and glob results and masked skill reads came back as mixed spellings such as /mnt/user-data/workspace/pkg\util.py. Depth-1 tails happened to splice cleanly, which is why Linux CI never caught it; the two splice sites now normalize the tail before joining it to the virtual prefix. (#5247)
• sandbox: Reverse-resolve forward-slash spellings of Windows host paths. Forward resolution spells resolved paths with /, since backslashes would break bash escape sequences like \U, but the reverse scanner that maps host paths in output back to their /mnt/... form still anchored its matches on the native backslash base — so every forward-resolved path that came back in command output or in an agent-written file failed to match and leaked the raw host path, real username and full directory tree, to the model instead of the container path the agent is meant to reference. The scanner now matches separator-agnostically, the same contract the sandbox tools already use; POSIX hosts, where the two spellings coincide, are unaffected. (#5373)
• sandbox: Stop remote list_dir from reporting failures as an empty directory. find ... 2>/dev/null on a missing path produced empty stdout and client errors were swallowed as [], so ls told the agent the directory was (empty) — a dead sandbox, a closed client, and a nonexistent path all looked like a writable empty tree, letting the agent write over existing files or skip recovery. AIO, E2B, BoxLite, OpenSandbox, and Tenki now raise OSError on command or client failure and FileNotFoundError when nothing is listed, matching what the local sandbox already did for a path that is not a directory; a genuinely empty directory still reports (empty), and find -H keeps a symlinked root listable. (#5264)
• sandbox: Reject a partial remote list_dir traversal instead of presenting it as complete. find exits 1 both for a missing start path and for a file or subdirectory it could not read after printing some entries, and the parser accepted 1 in both cases — so a traversal that failed partway returned the visible entries as a successful complete listing and ls handed the agent a silently incomplete tree. Status 1 with no entries still raises FileNotFoundError, while status 1 with any entries now raises OSError naming the incomplete traversal and suggesting a narrower path, the same contract remote glob already applied. Every provider sharing the remote list_dir helper inherits it without provider-specific changes. (#5422)
• sandbox: Stop remote grep and glob from reporting failures as "no matches". The searches ran with stderr discarded and took the pipeline status from head, so a missing search root, a missing grep/find binary, or an unreadable tree printed nothing and exited 0 — and the tools told the agent "No matches found" where the local sandbox reports Error: Directory not found. A shared wrapper now records the search command's own status: a missing root raises FileNotFoundError, and any other failure — including grep 2 or find 1 after some results were already printed, since a caller cannot tell a partial result from a complete one — raises OSError telling the agent that some paths could not be read. A genuine no-match still returns []. E2B, OpenSandbox, BoxLite, and Tenki also raise on a closed client instead of returning empty. (#5380)
• sandbox: Report read_file truncation in lines and name the line to resume from. The tool head-truncates at sandbox.read_file_output_max_chars (default 50,000) and its marker told the model to continue with start_line/end_line, but the cut was made at a character offset and the marker reported only character counts — so it almost always landed mid-line and the last line the model saw was a fragment that read as complete, with nothing saying which line to continue from. Asked for the next read of a truncated file, three models picked the right start_line in 0 of 15 attempts, landing tens or hundreds of lines off. The cut now lands on the last line boundary the budget allows, and the marker states the position in lines and names the exact continuation, as in [truncated: showing first 743 of 1828 lines (49746 of 155704 chars). Continue with start_line=744]; a ranged read reports file line numbers rather than the provider's slice-relative ones. A single line longer than the budget still cuts at the character limit, since dropping it would discard most of the budget, and the marker then points at bash rather than at a read_file call that cannot return it. (#5474, #5478)
• sandbox: Force a UTF-8 console in PowerShell so CJK tool output is no longer garbled on Windows. The command runner captures stdout through a UTF-8 pipe reader, but Windows PowerShell 5.1 writes console output in the legacy OEM codepage — GBK on zh-CN Windows — unless explicitly switched, so every CJK character arrived as mojibake, and because the reader replaces undecodable bytes rather than raising, the corruption was silent. Every PowerShell -Command payload now sets InputEncoding, OutputEncoding, and $OutputEncoding to UTF-8 before the user command runs. (#5440)
• sandbox: Validate the managed Lark CLI sandbox runtime in a platform-aware way on Windows hosts. The check required a POSIX executable bit, which NTFS does not preserve, so every candidate reported st_mode & 0o111 == 0 and the Gateway raised ValueError: Managed Lark CLI sandbox runtime file is not executable — leaving the managed Lark runtime unusable on a Windows development host, and on a Windows Docker host that mounts the managed Linux CLI runtime into the sandbox. POSIX keeps the strict executable-bit contract unchanged; on Windows the Linux-only artifacts are validated by content instead, requiring executable image magic on the per-arch binaries and a shebang on the launcher. (#5442)
• sandbox: Default the Docker-outside-of-Docker sandbox port bind to loopback on Docker Desktop. DEER_FLOW_SANDBOX_HOST defaults to host.docker.internal in DooD mode, which resolves inside containers to the Docker Desktop VM gateway, and publishing the sandbox port to that address made the host socket layer reject the bind with WSAEADDRNOTAVAIL — so the first sandbox shell action failed with ports are not available even though startup had succeeded. When the Docker server is Docker Desktop and no DEER_FLOW_SANDBOX_BIND_HOST override is configured, the bind host is now 127.0.0.1, which Docker Desktop forwards; an explicit override still wins, and native Linux DooD is unaffected. (#5446)
• sandbox: Drain the skill-sync worker before a cancellation is treated as failure cleanup. The default sync_agent_skills_async() wrapper used a bare asyncio.to_thread(), so cancelling the awaiting task returned before the synchronous sandbox mutation had finished, and SandboxMiddleware then released the execution holder while provider work was still in flight — breaking the lifecycle contract that blocking work started on behalf of a holder must drain before that holder leaves the boundary. The wrapper now runs through the existing cancellation fence, so the ordering holds for third-party and upload-based providers that do not serialize sync and release themselves. (#5350)
• frontend: Keep a human-input card with the turn that requested it. An existing needYourHelp card could drift below the next user message during a multi-turn conversation, so the chronology became misleading and an answered request could read as part of the new turn. A pre-submit baseline message could be woven in after the newly persisted human message, a card confirmed only through REST history might never enter the checkpoint baseline, and steps already persisted for the current run could be lifted into the previous turn after an interrupt. Baseline messages are restored before the pending human message, REST-confirmed cards count as established history, and the current run's own steps stay below the message that started them. (#4892)
• frontend: Preserve server-assigned message positions through a live content merge. Streaming updates that replaced a message's content also dropped its deerflow_seq, so ordering the server had already settled was recomputed client-side and came out wrong — a loaded history window of 1,3,5 merged with a live tail of 2,5 rendered as 1,3,2,5, and long threads (history pagination, or a conversation resumed after compaction) showed their steps out of order until a refresh. Content and position are now handled separately, the merge, compaction bridge, and render ledger share one position priority so an already-sorted upstream is not re-sorted downstream, and anomalous sequence values (null, string, NaN, non-integer, non-safe-integer) never overwrite a known position. (#5293)
• frontend: Restore the user's input after an incremental stream reconnect. Refreshing during a later turn could let the reconnect stream replay AI and tool chunks before the current human input had entered the durable history feed, so the user's message briefly vanished and its reasoning steps were grouped under the previous turn. The active run's input is now hydrated from kwargs.input and merged with the latest durable thread state before the incremental stream is joined, deduplicated by id; if the metadata or state read is unavailable, the previous reconnect path is used unchanged. (#5428)
• frontend: Show an agent's skill badge even when its tool groups are explicitly empty. The badge container's nullish-coalescing chain stopped at the tool-group count 0, so an agent declared as tool_groups: [] with skills: ["data-analysis"] lost its badge in the Agents gallery — even though an explicit empty tool-group list is valid and supported by the Agent API and the update_agent tool. The container now shows when either list has at least one entry. (#5326)
• frontend: Scope composer slash-skill suggestions to the active agent. Custom-agent chats can restrict which skills they may activate, including to an explicit empty list, but the composer still offered the global enabled-skill catalog — so an agent could suggest a skill it was not permitted to activate. Suggestions now pass through the active agent's allowlist, with an explicit empty list treated as no skills available rather than briefly leaking the global catalog while the agent loads, and the same scoping applied when a saved composer draft with a selected skill chip is restored. (#5451)
• frontend: Confirm before a sidebar chat is deleted. Choosing Delete in a recent chat's menu removed the conversation and its files immediately, with no confirmation step despite deletion being irreversible. A dialog now names the conversation and warns that deletion is irreversible, focuses Cancel, and leaves the chat intact on Cancel, Escape, or close; actions are disabled and dismissal blocked while deletion is pending, and a failed deletion keeps the dialog open with the underlying error so it can be retried by keyboard. The dialog is hosted outside the virtualized sidebar rows, so a list refresh cannot remove the retry UI after a partial deletion. (#5406)
• agents: Keep the Custom Agent settings dialog within the viewport. Choosing Selected subagents could make the dialog taller than the window, pushing the title, close control, and Save/Cancel buttons off-screen while a long worker description filled the nested list. The header and action buttons now sit outside a single scrolling form area, subagent descriptions show a two-line preview with keyboard-accessible expansion that scrolls into view without moving focus or changing checkbox state, and long names and descriptions wrap without shrinking the checkboxes. (#5458)
• frontend: Keep the MCP configuration dialog within the viewport. Opening a long MCP server definition in the Capability Center let the JSON textarea grow past the window, so the centered dialog clipped its title, close control, and Save/Cancel buttons and became hard to edit or dismiss on smaller windows. The dialog is now viewport-contained with more horizontal room on desktop, long JSON scrolls inside the editor, and the title, Close, Save, and Cancel stay outside the scrolling region even at very small viewports or with a long server name or validation message. (#5492)
• frontend: Show a pointer cursor over interactive controls that were clickable while still displaying the default cursor, making their affordance unclear. One global selector now covers native buttons, role="button" elements, dropdown menu items, and command items, excluding native disabled controls and anything marked aria-disabled="true"; generated ui/ and ai-elements/ components are untouched. (#4921)
• frontend: Localize Chinese documentation links. MDX links and Nextra cards in the localized docs were rewritten without knowing the active docs language, so a Chinese reader following a quick-start link was sent to the English page. The localized docs layout now provides the language through context and link rewriting honors it. (#5275)
• runtime: Memory-only deployments keep their run history through scheduled cleanup. cleanup() evicted unconditionally, so an embedded consumer that built RunManager() with the documented default store=None lost completed runs from history when cleanup fired — get(run_id) returned None and list_by_thread() dropped the record, because there is no durable copy for those reads to fall back to. Eviction is now gated on a backing store, keeping the retain-forever behavior memory-only mode had before; store-backed managers still evict after the grace period. (#5453)
• events: Read JSONL event records that contain U+0085, U+2028, or U+2029. All three readers split on those Unicode separators as if they were record boundaries, so a record carrying one was skipped on read — which reused event sequence numbers after a reopen and turned idempotent inserts into duplicates. Thread reads, run reads, and sequence recovery now split on physical line feeds; existing valid files need no rewrite. (#5429)
• events: Keep the per-thread JSONL write lock until filesystem work settles. Cancelling a store call during its worker release dropped the lock while the append was still in flight, so a later deletion could complete before the cancelled append recreated the record, and a cancelled mixed-run batch could roll back over a write it had already acknowledged. Admitted mutations now retain their lock through file I/O, rollback, and bookkeeping before propagating the cancellation, covering put, put_if_absent, batched writes, and both deletion methods; queued callers can still cancel before admission, and unrelated threads stay independent. (#5439)
• events: Stop JSONL thread mutations from splitting onto two lock generations across a deletion. delete_by_thread() removed the per-thread lock from its registry while still holding it, so a mutation already queued on the old lock could run concurrently with a later mutation that resolved a freshly created lock for the same thread — overlapping sequence assignment and file mutation right after a delete boundary. The registry is now a WeakValueDictionary and the entry is no longer popped, so holders and queued waiters keep the same generation alive until they drain, after which the entry disappears on its own. (#5455)
• channels: Keep one lock generation for a channel's first-use thread creation. The cleanup removed the per-conversation lock unconditionally when the current creator exited, so a creator that failed or was cancelled released and unregistered its lock while a queued creator entered through it, and a late arrival could install a new lock and enter concurrently — two callers creating Gateway threads for the same conversation, with the later mapping write winning and adjacent messages split across the orphaned thread. The hand-managed lifecycle is replaced by the existing waiter-aware keyed lock table, so a conversation key keeps one discoverable generation through exceptions and cancellation and the idle key is reclaimed only after the last participant leaves. (#5480)
• gateway: Read a thread's runs as the data owner, not as the authorization identity. The list, keyset-page, and single-run read endpoints filtered run rows by the caller's authorization identity, while start_run stamps them with the data identity — the two only coincide for already-safe owner values, so trusted internal callers always saw an empty runs list and 404s even on threads they were authorized to act on, and the symptom was easily misread as run loss. Internal callers now skip the per-user store filter, which thread visibility on these endpoints already authorizes, while browser and API sessions keep their exact per-user filter; the two message-read endpoints had the same conflation and are corrected the same way. (#5448)
• gateway: Apply the same data-identity scoping to the message edit and regenerate helper paths. Those three helpers still resolved the authorization identity and passed it as the data filter, so regenerate/prepare and edit-regenerate/prepare failed with 409 for internal callers on threads they were authorized on. They now resolve their filter id the same way the read endpoints do, and browser and API sessions keep the prior per-user filter and the 409 on cross-user runs. (#5483)
• conversation: Keep conversation-reader pages inline and say when text was dropped. A page was filled to its 20,000-character cap by cutting the last message that did not fit, and a cut suffix could never be paged back — the oldest of six 3,500-character messages came back as about 2,500 characters with has_more: false. Worse, a page over the default 12,000-character tool-output budget was externalized by ToolOutputBudgetMiddleware, so the model saw only a synopsis plus a file copy of the source text in the destination thread. Pages are now sized by the budget that actually applies to read_conversation (per-tool override, else externalize_min_chars, and fallback_max_chars), still capped at 20,000 text characters, and a message that does not fit starts the next page intact — so one operator setting stays in charge, and tool_output.tool_overrides.read_conversation tunes this tool alone. Truncated results now carry a notice asking the agent to acknowledge the omission and ask for the missing material before claiming full coverage. (#5421)
• goal: Stop a goal loop while a clarification card is still open. The goal evaluator only reads human and AI messages, so a question asked through ask_clarification — which arrives as a tool result — was invisible to it; it judged the goal unmet, and the worker queued a hidden continuation telling the agent to keep working and not to ask the user unless genuinely blocked. The agent then acted on its own guess, including on a risk_confirmation question, while the card sat waiting in the UI. A trailing human-input request is now detected before the evaluator runs and stands the goal down with the existing reason blocked:needs_user_input; the user's answer is a new human message, so the next run evaluates normally, and a card with no assistant text before it reports why it stopped instead of run_failed. (#5467)
• client: Emit text a later node appends to an AI message already sent. LoopDetectionMiddleware, TokenBudgetMiddleware, SafetyFinishReasonMiddleware, SubagentLimitMiddleware, and TerminalResponseMiddleware each rewrite the last AI message under the same id from their own node, but the stream marks an id seen once and then skips it, so the rewrite never reached messages-tuple consumers: chat() and headless --print returned the text from before the rewrite instead of the terminal error or the forced-stop notice, the TUI never showed the stop or safety notice, and token_usage_attribution added after the model node never arrived. The values path now remembers the message object last seen per id and re-examines it when a snapshot holds a different one, emitting only the added text as one more delta and routing new additional_kwargs through the existing metadata-only follow-up; unchanged messages are still skipped without re-extracting text. A replacement that does not extend the sent text is not re-emitted. (#5479)
• mcp: Hold the MCP session pool to its capacity limit under concurrent initialization. MCPSessionPool checked LRU capacity only before session creation started, and because initialization awaits, several distinct keys could each observe spare capacity, enter _inflight, and then promote into _entries with no second check — leaving the persistent-session registry above MAX_SESSIONS and retaining the extra subprocesses and connections it implied. Capacity is now rechecked and enforced atomically when a session is promoted, and promotion-time eviction victims are closed outside the registry lock through their owner-task lifecycle. (#4962)
• mcp: Stop parallel synchronous MCP calls from cancelling each other's connection. When an embedded client dispatched two synchronous calls to the same stdio server, each wrapper ran on its own event loop and the pool treated the sibling loop's live session and in-flight creation as stale — cancelling or closing them and aborting a tool step with CancelledError instead of returning both results. Established sessions and in-flight creation are now keyed by (server_name, scope_key, owning_loop), so same-loop callers still share creation and state while separate loops get their own, and each owner retires only its own records, including after a normal asyncio.run() shutdown. Synchronous calls still use independent subprocess sessions and gain no shared server-side state. (#5396)
• web-fetch: Resolve relative destinations in extracted Markdown against the page they came from. Jina, Browserless, and InfoQuest returned links exactly as written in the HTML, so a page at https://example.com/docs/current yielded [Next](../next) and left the agent with no URL it could follow up on. The three providers now pass the requested URL to the shared extractor, which resolves anchor and image destinations against that URL or against the first usable document <base>; only destination attribute values are rewritten rather than serializing a different parse tree, so malformed markup, comments, scripts, and attribute formatting survive untouched and still reach Readability.js unchanged. Fetch validation, the 4096-character output limit, and off-thread extraction are unchanged, and the Python fallback keeps its text-only behavior. (#5310)
• community: The Firecrawl web_fetch and web_search tools honor the tool's base_url. _get_firecrawl_client read only api_key, so FirecrawlApp always fell back to https://api.firecrawl.dev — and because the SDK raises Error: No API key provided whenever the target is the cloud API and no key is set, a self-hosted Firecrawl was unreachable no matter how the config was written. base_url is now forwarded as api_url, letting a local Firecrawl serve both tools with no cloud key, and configurations without base_url construct the client exactly as before. (#5392)
• community: Tavily extraction reads its credentials from the web_fetch entry instead of the search configuration. With web_search on Serper and web_fetch on Tavily, fetching built its client from the Serper key and ignored a separate Tavily fetch key entirely. Each tool now reads api_key from its own entry and falls back to the SDK's TAVILY_API_KEY when omitted, matching the existing Exa helper. Configurations that put a shared Tavily key only under web_search must also set it under web_fetch, or rely on TAVILY_API_KEY for both. (#5496)
• client: DeerFlowClient.stream() emits a streamed tool call once, with its complete arguments. OpenAI-style models put the tool name and id in the first chunk and argument fragments with no id in the rest, and the client emitted a messages-tuple tool_calls event for every chunk, each parsed from that chunk alone — so the complete call, which does arrive in the values snapshot, was skipped because its message id was already in streamed_ids. The tool itself ran with the right arguments; only the event stream was wrong, and in the TUI the tool card showed bash with an empty detail instead of the command. One event is now emitted per message from the values snapshot, while whole AI messages from non-streaming models and streamed text are unchanged. (#5408)
• browser: Keep browser session teardown alive across caller cancellation. BrowserSessionManager.close_session() removed a session from the registry before awaiting its close, and that close awaited the private Playwright loop directly, so a cancellation at that point propagated through asyncio.wrap_future() into the cleanup itself — leaving the browser process and context orphaned, with the session already out of the registry and no owner left to retry. close_all_sessions() had the same ownership problem at a larger scale: it cleared the whole registry first, so a cancellation while closing the first session stranded every later session with no teardown scheduled at all. Teardown is now submitted to the private loop before any cancellable await and awaited behind asyncio.shield(), and close-all schedules every session before its first await and shields the group wait. The caller still receives CancelledError; only ownership of the already-started cleanup is isolated from it. (#5444)
• browser: Detect the browser dependency regardless of tool field order. Startup dependency detection recognized a tool name only when name was the first key of its YAML list item, so moving name below use or group kept the tool configuration working but silently omitted the browser extra from uv sync, leaving browser tools without their required dependencies. The direct name field is now recognized anywhere in a tool entry, tracked indentation keeps names inside nested options from enabling the extra, and the detector stays standard-library-only because it runs before dependencies are installed. (#5456)
• setup: The same pre-sync extras detector now reads config.yaml as utf-8-sig. PyYAML accepts a leading UTF-8 BOM but the detector read the file as plain utf-8, leaving the BOM attached to the first line, so its anchored section patterns failed to recognize a valid config's opening section and omitted the extras it declared — postgres, browser, and ollama detection all failed the same way when their section came first, while a plain-UTF-8 copy of the same file worked. (#5504)
• video: Forward --aspect-ratio into the Gemini Veo request. The skill CLI accepted the flag and passed it to generate_video(), but the Gemini branch built its predictLongRunning body from instances alone and dropped the value, so every Veo request rendered at the provider default ratio regardless of the argument. It is now sent as parameters.aspectRatio. (#5388)
• channels: Both WeCom outbound paths sent unbounded text while the bot protocol caps content at 20480 UTF-8 bytes, a bar a deep-research report clears easily. Over the cap, _send_with_retry retried three times and gave up: the stream path left the reply stuck mid-way without ever sending finish=true, and the push path dropped the reply entirely. Stream replies now clip on a UTF-8 character boundary behind a visible truncation marker — one stream carries the whole reply, so it cannot split mid-way — while proactive pushes with no replyable frame, such as scheduled-task notifications, split into sequential markdown messages at newline boundaries so the full content still arrives. Both paths now measure the payload in UTF-8 bytes rather than characters. (#5148)
• channels: Inbound WeChat (iLink) and WeCom media was downloaded in full before any size limit applied, and the download target was a URL taken straight from the message payload with no destination validation, so a legitimately oversized attachment spiked Gateway memory before being rejected. Both channels now stream the transfer and abort in flight once it exceeds max_inbound_image_bytes / max_inbound_file_bytes, with the exact post-decrypt size checks kept as a second line. Inbound full_urls are gated to http/https plus a dot-boundary host-suffix allowlist — the qq.com family and the configured CDN host by default, extendable with channels.wechat.allowed_media_hosts and channels.wecom.allowed_media_hosts — with the WeCom COS gate pinned to the verified Tencent Cloud APPID shape, and the WeCom manager reader bounded by a 50 MB in-flight cap. Readers ask for Accept-Encoding: identity and refuse any residual Content-Encoding, so httpx cannot inflate a compressed body past the cap before it is measured. Well-formed media under the limits is unaffected; oversized or non-allowlisted media is now skipped with a warning naming the reason. (#5225)
• channels: Keep one undecodable WeChat message from dropping the rest of its batch. _poll_loop persisted the get_updates_buf cursor for the entire batch immediately on receipt, then iterated data["msgs"] with no per-message error isolation, so a single message whose processing raised — a corrupt or undecryptable attachment, such as a truncated encrypted image payload, is the realistic trigger — aborted the loop with the cursor already advanced past the whole batch. Every message after the failing one was permanently dropped and the next poll never re-fetched it. _handle_update now runs inside a per-message try/except, so siblings still reach the bus, the failure is logged with its message id, and the cursor still advances once the batch has been fully attempted. (#4231)
• channels: When the Discord client thread died — an invalidated token, an unrecoverable close — Client.start() returned and left its event loop stopped but not closed, so call_soon_threadsafe queued a callback that would never run and the unbounded await asyncio.wrap_future(...) in send, send_file and _get_channel_or_thread hung forever. Each outbound to the dead channel permanently consumed one ChannelManager worker from the default pool of five, so a handful of messages froze inbound processing for every IM channel, not just Discord. Those cross-loop calls now route through a helper that bounds the wait at DISCORD_OUTBOUND_TIMEOUT_SECONDS (30 s), with file uploads given DISCORD_UPLOAD_TIMEOUT_SECONDS (120 s) so a slow uplink plus a large 429 retry-after cannot cancel a healthy transfer, and a missing or stopped loop closes the coroutine and raises immediately. DiscordChannel.is_running also requires the client thread to be alive, as FeishuChannel already did, so readiness polling restarts the channel instead of treating a dead one as healthy; and a half-started instance is now stopped and discarded when start() fails, so repeated readiness retries cannot accumulate stale outbound listeners on the bus. (#5227)
• channels: Discord thread mappings are persisted off the event loop after a thread is created, so a process killed between the creation and its background write could still lose the newest mapping and leave a Discord thread unreachable after the restart. stop() now flushes the in-memory mappings to disk, wrapped so a shutdown path is never blocked — a best-effort net over the hard-kill window rather than a new write path. (#5461)
• channels: Enabling rich_messages in the Telegram channel config made every final outbound message render as a mangled single line: command menus such as /help and plain error replies were sent through sendRichMessage with rich_message.markdown, which collapses single newlines and strips the <name> / <skill-name> / <task> angle-bracket tokens the menus rely on. A message is now sent as rich only when rich_messages is enabled and the text actually contains a rich construct — a fenced code block, a table row or separator, a task list, a [text](url) link, bold, italic, a <details> block, or $$ math. The detector is deliberately conservative, requiring a table to lead its line with |, so a line like /goal [condition|clear] in /help never trips it. (#5470)
• community: The InfoQuest reader, web search and image search called requests with no transport timeout, so a stalled endpoint left the synchronous worker waiting indefinitely even when the remote crawl timeout field was configured. All three call sites now share a 30-second connect/read inactivity bound; crawl timeout and navigation payload fields, successful parsing and the existing Error: returns are unchanged. This bounds inactivity, not total wall-clock time. (#5315)
• models: The request-admission limiter decided immediate admission and queue insertion under two separate lock acquisitions, so a blocking caller could observe that the next permit was not yet due, be descheduled before it enqueued, and then be overtaken by a newer caller once the permit came due while the waiter queue was still empty — the newcomer took the permit and the older caller waited a further interval, or under a short max_wait_seconds timed out while the later request succeeded. Immediate admission and FIFO insertion are now a single lock-protected decision. Non-blocking calls still fail fast and never enter the queue, and queued pacing, cancellation, timeout, queue-capacity and no-burst behavior are unchanged. (#5459)
• uploads: Uploaded-document outlines counted any line starting with # as a heading, so a document with 51 #tag lines before # Real section consumed every outline slot and hid the real section; four-space and tab-indented comments became false headings, and optional closing hashes stayed in the titles. The extractor now matches root-level ATX syntax on the original line — one to six hashes, a space or tab separator or end of line, at most three leading spaces — and strips valid closing hashes before the existing bold cleanup. Physical line numbers, PDF structural headings, fenced-code exclusion and the heading-count limit are unchanged, and the scanner stays bounded rather than becoming a Markdown parser. (#5316)
• uploads: A single 200,000-character paragraph produced a 199,999-character upload preview despite the five-line limit, and long valid headings bypassed the 50-entry limit as a practical context-size bound. Outline titles are now capped at 200 characters and fallback preview text at 2,000 characters across all lines, with the omission markers counted inside those budgets. Physical line numbers, short text, the existing heading and preview counts, and the original file bytes are preserved; this bounds returned summary text only, not file-scan memory or a budget across uploads. (#5323)
• doctor: On a fresh clone, make config followed by make doctor reported four errors where only one was real: config.example.yaml ships a models: key with every entry commented out, which parses as None, so the [] default in .get("models", []) never applied and a broad except rendered the resulting TypeError as three 'NoneType' object is not iterable check results. A new user saw what looked like a broken install at the exact moment make doctor is meant to reduce confusion, when they had simply not configured a model yet. The LLM checks now skip when no models are configured, leaving the actionable models configured failure and its make setup hint; nothing changes once a model is configured. (#5296)
• scripts: detect_uv_extras.py resolves uv extras from config.yaml so make dev does not wipe optional dependencies on every restart, but it had no rule for Ollama — so with an Ollama model configured it returned nothing, serve.sh ran uv sync without --extra ollama, and langchain-ollama was uninstalled from a working setup. The configured model then failed with ModuleNotFoundError: No module named 'langchain_ollama' with nothing pointing back at make dev as the cause, even though make doctor had just reported the package installed. Configuring an Ollama model now makes make dev pass --extra ollama, the same way database.backend: postgres passes --extra postgres; a config without an Ollama model is unaffected, and the commented-out Ollama examples in config.example.yaml are correctly ignored. (#5318)
• docker: On Windows Git Bash, make docker-start and make up aborted unconditionally with Docker socket not found at /var/run/docker.sock — AioSandboxProvider (DooD) will not work. MSYS2/Git Bash has no physical Unix socket at that path — Docker Desktop uses named pipes — even though the daemon natively handles mounting /var/run/docker.sock into Linux containers, so the check could never pass. Under MINGW*, MSYS* and CYGWIN* the preflight now verifies docker info connectivity instead of requiring a socket file; POSIX hosts still fail fast on a missing socket. (#5371)
• deploy: make up failed on Windows Git Bash during container startup with mkdir C:\Program Files\Git\var: Access is denied. scripts/deploy.sh exported DEER_FLOW_DOCKER_SOCKET=/var/run/docker.sock, and MSYS converted that exported value into a Windows host path when invoking native docker compose, so docker-compose.dood.yaml mounted C:\Program Files\Git\var\run\docker.sock and the daemon tried to create a directory that does not exist on the host. The socket is now kept in an unexported local variable, as scripts/docker.sh already did, and on Windows Git Bash the variable is unset when it holds the default so Compose expands its own literal /var/run/docker.sock; an operator-set custom socket path is still passed through. (#5402)
• mcp: Exclude the internal stdio MCP temp directory (.mcp/tmp) from workspace changes, so MCP temporary and debug files no longer appear alongside user deliverables or crowd real changes out of the file budget. (#4898)
• mcp: Cancel the remote task when a durable task submission is cancelled mid-flight, so an interrupted submission no longer leaves a remote task running with no record to poll or stop. (#4933)
• sandbox: Accept the documented E2B reconciliation config fields, so valid E2B configuration no longer produces misleading startup warnings. (#4772)
• sandbox: Bound E2B mount upload resource use per file, per mount, and across the whole upload pass (shared size and file budgets plus a wall-clock deadline), so large mounts can no longer spike Gateway memory or hold sandbox capacity indefinitely. (#4812, #4842)
• sandbox: Preserve trailing whitespace in E2B-synced filenames and tolerate out-of-range remote mtimes, so output sync no longer re-downloads files repeatedly or aborts mid-sync. (#4861)
• sandbox: Reject non-finite Redis lease-timing values in sandbox ownership config at parse time instead of crashing with an OverflowError during startup. (#4960)
• sandbox: Resolve structured skill reads through the sandbox provider's path mappings, so read_file opens legacy and per-user custom skills under the same enabled-state projection as ls and shell execution. (#4792)
• skills: Parse Responses API content blocks in the moderation scanner, so valid skill-management decisions returned as content blocks are no longer rejected as unparseable. (#4936)
• memory: Reject non-positive and non-finite timeout and character-limit settings in the Honcho and Mem0 backends at config parse time, so a bad value fails fast instead of silently truncating stored text or crashing on the first HTTP call. (#4783, #4823)
• memory: Scope custom-agent bootstrap facts to the selected agent's bucket, so facts learned during setup no longer leak into the default bucket and influence ordinary lead-agent conversations. (#4804)
• artifacts: Support atomic saves on Windows, and serve a SHA-256 ETag on artifact reads so inline preview and editing work on non-secure contexts such as plain-HTTP LAN origins where crypto.subtle is unavailable. (#4629, #4865)
• frontend: Keep conversation order stable around long runs: the submitted user message no longer renders twice or sinks below its own processing steps, and after a mid-run page reload a turn's steps can no longer appear above the user message that started the run. (#4620, #4660, #4834)
• frontend: Stop matching <header> as <head> when injecting the base href into HTML artifact previews, so relative assets in report fragments that begin with <header> now load in the sandboxed preview iframe. (#4625)
• frontend: Open landing-page case studies on a public read-only /showcase/ route so anonymous visitors are no longer redirected to login. (#4635)
• frontend: Sort the chats page by pinned state, so pinned threads no longer render below unpinned ones. (#4643)
• frontend: Keep <think> pairs written inside markdown inline code in the rendered content instead of hollowing them out into the Reasoning panel, and restore the copy button for turns that contain only reasoning. (#4647)
• frontend: Surface model-loading failures with a workspace error banner and retry action instead of a silently empty model list. (#4840, #5021)
• frontend: Preserve copy and other actions on completed assistant messages while a later turn is still streaming. (#4844)
• frontend: Keep the browser live stream connected after a successful reconnect instead of tearing down the new socket and immediately creating another. (#4951)
• frontend: Reuse the shared clipboard fallback when copying the Lark authorization link, so the copy action works in browsers without the Clipboard API. (#4767)
• frontend: Use consistent "DeerFlow" casing in the composer disclaimer and fix the "What's New" heading on the landing page. (#4970)
• channels: Bound inbound intake with a fixed worker pool and bounded admission queues, and await real cross-thread tasks on shutdown, so message floods are rejected promptly instead of accumulating and channel shutdown no longer tears down transports with work still in flight. (#4800, #4816)
• channels: Offload outbound attachment file IO for Feishu, Telegram, and WeCom to worker threads, so sending a large artifact no longer stalls the Gateway event loop. (#4633)
• channels: Run Telegram connection-identity lookups on the Gateway event loop, so inbound messages and commands no longer crash with a cross-loop error when channel connections are enabled. (#4815)
• feishu: Keep file receiving off the event loop and preserve every inbound attachment: duplicate provider filenames no longer overwrite each other, writes can no longer be redirected outside the thread bucket, and a failed attachment no longer blocks the rest of the message. (#4627, #4903)
• dingtalk: Strip leading @bot mentions before command classification, so slash commands like /new sent in group chats are recognized instead of treated as plain chat. (#4724)
• discord: Refuse to start typing-indicator loops after the channel stops, so shutdown no longer leaves an infinite typing task sending events in the background. (#4752)
• wecom: Serialize WebSocket start/stop transitions and await the SDK's real receive-task shutdown, so stopping the WeCom channel can no longer return before the socket closes or clear a newer connection's state. (#4762)
• buzz: Drop replayed events across reconnects using a persistent seen-id store, so the agent no longer re-answers the last message in a channel after a relay or Gateway restart. (#4888)
• lark: Keep the CLI lock directory writable inside sandboxes while the credential-bearing config root stays read-only, restoring Lark API commands that previously failed with a read-only filesystem error. (#4701)
• scheduler: Enforce the global max_concurrent_runs budget for manual triggers too, returning HTTP 409 when the cap is reached instead of letting manual launches exceed it. (#4769)
• scheduler: Coerce serialized task timestamps on read, so scheduled-task operations no longer fail when string-form timestamp values reach the database layer. (#4785)
• scheduler: Support safe multi-instance scheduler recovery: startup no longer treats live runs owned by peer Gateway instances as local leftovers, so a restarting instance cannot interrupt a live run or trigger a duplicate execution; multi-instance mode is opt-in via scheduler.multi_instance. (#4713)
• scheduler: Enqueue busy scheduled task runs instead of skipping them: occurrences that hit a busy reused thread now wait in a durable queue (bounded by scheduler.queue_timeout_seconds) and survive Gateway restarts, and the UI explains the queueing behavior. (#4918)
• cli: Add --recursion-limit to headless --print, --json, and --cli runs, so long-running agent loops are no longer stuck at the default recursion limit of 100. (#4615)
• dev: Exclude backend runtime state from the Uvicorn reload watcher in the backend make dev launcher, so an agent task writing files under the runtime tree can no longer restart the Gateway and reset concurrent users' requests. (#4759)
• dev: Resolve diagnostic script paths from the script's own location, so root diagnostic commands work when invoked from any working directory. (#4736)
• docker: Harden local and container startup: make up waits for the Gateway health probe before declaring the stack ready, Docker startup no longer aborts when .env is missing, the Gateway can write extensions_config.json in production, runtime data stays out of the image build context, log commands resolve the checkout root correctly, and the default loopback origins are allowed so the dev setup page can hydrate. (#4658, #4806, #4852, #4853, #4956, #4959)
• gateway: Stamp the server-authoritative feed position onto persisted messages, so an early user message no longer vanishes or jumps into the middle of the step stream once history exceeds one page and context compaction has fired. (#4696)
• lark: Preserve the new app secret during managed credential switches by clearing the previous app's OAuth data before the replacement is written, so the subsequent browser authorization no longer resolves an empty client_secret. (#4820)
• messages: Drop legacy <uploaded_files> tag handling: the backend treats the pre-#4174 spelling as ordinary content and strips only <current_uploads>, while the frontend keeps stripping the legacy tag so old threads still render cleanly. (#4826)
• skills: Reject a blank SKILL.md description at the write gate, matching what the loader already requires, so editing a custom skill with an empty description no longer writes a file the loader then rejects - which destroyed the skill on disk. (#4867)
• sandbox: Make the model-facing description argument optional (empty by default) across bash, ls, glob, grep, read_file, write_file, str_replace, and task, so providers that omit it are no longer rejected before execution. (#4878)
• sandbox: Bound Windows command execution: host commands run in a new process group killed via taskkill /T /F on timeout so a descendant cannot hold the call open, and output flows through the existing bounded 10 MiB capture. (#4946)
• sandbox: Scope the Windows MSYS path-conversion exclusion to safe virtual path prefixes instead of disabling conversion globally, so host-native CLI launchers that need normal conversion work again. (#5003)
• skills: Rebuild per-user skill storage after an app-config hot reload, so it no longer stays bound to paths from the previous config instance. (#4972)
• skills: Tokenize portable allowed-tools scalars with parenthesis awareness, so Bash(tvly *)-style entries stay intact, unmatched parentheses are rejected instead of silently fragmenting, and argument-scoped entries remain literal rather than broadening access. (#4984)
• agents: Normalize ToolMessages returned inside Command results, so error payloads no longer earn a default success receipt and tool-progress tracking sees them. (#4977)
• config: use_previous_response_id works in a config.yaml model entry — it is not a ModelConfig field and reaches ChatOpenAI only through the model factory's extra="allow" passthrough — but was never documented, and reads like a synonym for use_responses_api. It is not: use_responses_api picks the endpoint, while use_previous_response_id switches the Responses API from replaying the full history each turn to chaining on server-side state. The OpenAI Responses API example in config.example.yaml gains a commented use_previous_response_id: false line noting that it is forwarded to ChatOpenAI as-is, that chained context is still billed as input tokens, and that client-side history rewrites only apply when the history is replayed. Comment only — no schema change, no new ModelConfig field, no config_version bump. (#5359)
• mcp: Tear down the in-flight session owner when get_session is cancelled during eviction, so a cancelled caller no longer leaks the owner task or parks past its timeout. (#5008)
• mcp: Reconnect ordinary stdio tools after a transport disconnect: the failed pooled session is evicted (only if still registered), the original error surfaces without automatic replay, and a later retry starts a fresh subprocess. (#5018)
• mcp: Preserve pooled stdio sessions after protocol timeouts during durable MCP task polling - a 408 is not a disconnect - so task state survives and the next poll no longer reports task_not_found. (#5027)
• mcp: Reject credentials that cannot travel as HTTP header values (trailing newline or whitespace, non-ASCII) at the config boundary, so the transport's exception - which echoes the full value - can no longer leak a secret into model context, checkpoints, and traces. (#5066)
• subagents: Clean up the background-task entry when the poller exits unexpectedly and drop a PENDING registry entry when submission fails, so a failed or crashed poll no longer leaks the entry or leaves the subagent running unattended. (#5069)
• subagents: Stop the zombie PENDING registry entry on the submit-failure path, and derive the capacity snapshot's queued count from the waiters' length instead of iterating a deque other threads mutate. (#5086)
• channels: Synchronize ChannelStore reads with mutations, so get_thread_id()/list_entries() can no longer raise dictionary changed size during iteration. (#5083)
• discord: Retain strong references to ack-reaction tasks and drain them on shutdown, so a GC pass can no longer silently drop a reaction or pin the channel across restart cycles. (#5049)
• buzz: Move seen-event persistence off the event loop with coalesced atomic writes, preserving dirty generations when events arrive mid-write and awaiting the final flush on shutdown. (#5103)
• streaming: Stop an IndexError in MemoryStreamBridge._make_gap when a subscriber reconnects to an empty or drained stream with an expired cursor. (#5047)
• uploads: Keep deduplicated filenames within the 255-byte limit by truncating the stem on a UTF-8 code-point boundary, so two max-length files that differ only by a dedupe suffix upload successfully instead of failing the whole batch. (#5059)
• frontend: Format structured upload error details (FastAPI validation issues, objects, arrays) instead of showing [object Object]. (#5071)
• frontend: Keep a renamed thread's title in sync across the active chat header, document title, search results, and metadata caches without a reload. (#5045)
• frontend: Truncate selected model names to the selector button width, so long model names ellipsize in the composer and sidecar instead of overflowing. (#5050)
• frontend: Truncate long subtask card titles to one line with a tooltip, so a delegation whose model omitted description (falling back to the full prompt) no longer overflows the chat layout. (#5136)
• dev: Default the frontend dev server to Webpack on all platforms (DEER_FLOW_DEV_BUNDLER=turbo opts back into Turbopack), avoiding Turbopack's macOS PostCSS worker leak and its Windows runtime panics. (#5036, #5133)
• scripts: Run repo shell scripts through an explicit interpreter (bash scripts/...), so a lost executable bit - zip/tarball downloads, core.fileMode=false, non-POSIX filesystems - no longer breaks make docker-start and friends with Permission denied. (#5031)
• deps: Depend on the renamed tenki package instead of the PyPI-removed tenki-sandbox (same tenki_sandbox import), so clean checkouts can resolve dependencies again on make dev/uv sync. (#5087)
• memory: Memory reads configured to stop the turn now raise a backend-neutral MemoryReadError that prompt assembly preserves instead of swallowing: strict OpenViking (read: raise), Mem0, and Honcho reads propagate, OpenViking scope-resolution failures follow the configured read policy, and the 5-second injection deadline honors the same policy (fail-open continues without the context; strict raises with the timeout as its cause). (#4726)
• persistence: Add the storage foundation for a per-thread incarnation token without activating it. New nullable threads_meta.incarnation and mcp_tasks.thread_incarnation columns (a new Alembic head) let a task be tied to the specific thread a reused thread ID belongs to, since a deleted thread's ID can be taken by a later thread while durable MCP work outlives the deletion. A random 32-character incarnation is assigned to newly created thread records and copied into new MCP task rows only when the thread is owned by the task user or is an unowned legacy row, with the lookup and insert kept atomic on SQLite through a scalar subquery and a share lock on PostgreSQL. Nothing reads the fields yet, they are kept out of the thread and MCP task API responses, and both columns are nullable with no default so older binaries keep writing during a rolling deployment. (#5216)
• scripts: On native Windows, shutil.which("pnpm") follows PATH/PATHEXT resolution and can select a generic pnpm match — an .exe or .bat, or an earlier-path wrapper — ahead of the npm-installed pnpm.cmd wrapper. The shared host runner now checks pnpm.cmd and corepack.cmd before the generic names, matching the Windows command-selection order the repo already documents; POSIX resolution order is unchanged. (#5305)
• tests: The backend suite failed 68 shell-script tests across seven files on a Windows contributor host, none of them for anything wrong with the code under test. CreateProcess searches System32 before PATH, so the WSL bash.exe launcher won every ["bash", ...] spawn and could not run the repo scripts against Windows checkout paths — on non-English Windows its localized UTF-16LE warning crashed the harness's pipe decoding and buried the real failure behind a TypeError; sh does not exist outside MSYS2; and dev-entrypoint.sh's command -v python3 probe selected the Microsoft Store alias stubs, which exit 49 when executed. The suites now resolve a shell through a shared helper that mirrors the repo's Git Bash wrapper discovery and explicitly rejects the WSL launcher and the Store stubs, and skip cleanly where no Git Bash exists. POSIX and CI behavior is unchanged. (#5404)
• tests: Six tests across three suites failed on a Windows host purely on path-separator spelling. The provisioner's join_host_path deliberately preserves host-native style and even has an explicit PureWindowsPath branch, and os.path.normpath re-spells POSIX inputs with backslashes there, so the hostPath strings it builds, the docker --mount src= spelling, and the review CLI's PYTHONPATH never matched POSIX-style literals. The assertions now normalize the host-native side before comparing, which is a no-op on POSIX so CI expectations stay byte-identical; production behavior is unchanged. (#5413)
• tests: Five tests in the skill request-scoped-secrets suite failed on a Windows host and two negative checks passed vacuously, because the probes embedded POSIX syntax: LocalSandbox._get_shell() resolves to PowerShell there, where $VAR is an undefined PowerShell variable and expands to nothing, so the positive checks could never see an injected value and the "secret" not in out assertions were comparing against empty output. Probes are now rendered in the syntax of the shell production actually resolved — $env:NAME under PowerShell, %NAME% under cmd.exe, $NAME under POSIX shells — so the negative checks genuinely verify scrubbing on Windows, and the per-call-scoping case also proves the injected value reached the first subprocess. POSIX output is unchanged in form. (#5415)
• tests: test_run_on_isolated_subagent_loop_survives_caller_loop_teardown failed intermittently under CI load, on unrelated PRs and on main itself. The race was in the test, not in run_on_isolated_subagent_loop: that helper is asyncio.run_coroutine_threadsafe, whose concurrent.futures.Future is only marked done after the coroutine returns, but the test signalled from inside the coroutine and asserted done() immediately, so the main thread could wake while the future was still pending. The assertions now block on result(timeout=10) before checking done(); no sleep is introduced and the behavior under test is unchanged. (#5299)
• tests: Checkpoint retention needs an executable statement of what a deletion may never break — a newest-N proposal had to be withdrawn once review showed it would silently break branch and time-travel parent-chain semantics. The new suite pins six retention scenarios across the memory, SQLite and Postgres checkpointers: growth baselines per step for the full and delta schemas; deleting a branch ancestor fails loudly with CheckpointLineageError instead of silently corrupting branch/regenerate; deleting an explicit resume target removes the resume surface; pending writes are retained state rather than garbage; and a trailing duration-only leaf and a leaf sibling branch — the real fork path — can be deleted safely. A companion draft documents the protected set, the provably safe deletion shapes, and joint-table mechanics with orphan accounting, for any future max_checkpoints_per_thread or TTL work to be validated against. (#5255)
• memory: Buffered memory extraction is cancelled when a custom agent is deleted or cleared, so pending debounce timers can no longer resurrect the deleted per-agent memory scope or overwrite a fresh clear with a stale pending update. (#5123)
• agents: Conversation titles are generated from the user's original message content when upload (or other) context wrappers have been injected into the text, so titles no longer quote server-injected <current_uploads> context; attachment-only messages keep the New Conversation fallback. (#4729)
• agents: Fraction summarization triggers resolve against the model's declared context_window (now translated into the LangChain profile), and an unresolvable fraction clause degrades to a never-firing trigger with a warning instead of crashing the whole agent build; percent-style and non-finite trigger values are rejected at config load. (#4901)
• agents: Custom-agent storage falls back to file-backed storage only when search mode cannot resolve the main application config — invalid configuration and missing config paths surface instead of silently switching storage backends — and store IO moves off the event loop in async agent routes. (#4952)
• middleware: Loop-detection hard stops win across a whole tool-call batch: selecting a soft warning no longer ends inspection, so a later call in the same response that crosses an operator-configured hard limit is rejected instead of riding along with the earlier warning. (#5245)
• sandbox: list_dir and glob in the five remote sandbox providers (E2B, OpenSandbox, AIO, Tenki, BoxLite) return filenames verbatim instead of stripping whitespace, so files whose names begin or end with spaces are no longer listed under paths that then do not exist. (#4980)
• sandbox: Concurrent subagents sharing one thread sandbox run under process-local execution leases with task-scoped AIO shell sessions, so one sibling finishing can no longer release the shared sandbox underneath the others or corrupt the implicit persistent session; a healthy replacement session is promoted after corruption instead of returning to it. (#5134)
• sandbox: The Bash tool guides the agent to detect its execution environment with evidence (uname -s, sw_vers, uname -a) instead of model assumptions, and rejected host paths direct it to command-only probes or allowed virtual paths rather than repeating the blocked command. (#5111)
• sandbox: The Docker AIO compatibility capability allowlist gains FOWNER, so AIO images whose startup chmods /run/user/1000 (e.g. 1.11.0) start again under the hardened default capabilities while no-new-privileges stays on. (#5163)
• sandbox: File appends no longer destroy existing content when the pre-read fails: E2B append treats only missing-file errors as an empty file and re-raises anything else instead of overwriting the file with just the appended tail, and AIO appends use the server's native append mode without a pre-read at all. (#5261, #5278)
• skills: Skill markdown is read explicitly as UTF-8, so localized skills validate on Windows hosts whose default code page is not UTF-8 instead of failing with UnicodeDecodeError. (#4995)
• mcp: The MCP tools cache re-initializes after a runtime config change: a module-level asyncio.Lock bound to a closed event loop and an unsynchronized initialized flag had left every post-update call failing with Lock is bound to a different event loop or racing across worker threads. (#5062)
• mcp: Sync-wrapped MCP tools keep LangGraph ToolRuntime injection (the annotation-less sync wrapper is now functools.wraps-transparent), so per-user scope resolution and durable task submission no longer run with runtime=None — which had routed completion-notification runs under the default lead agent instead of the thread's custom agent. (#5164)
• auth: A duplicate OAuth identity no longer reports "Email already registered" — the two integrity violations are distinguished — and the partial OAuth-identity index now declares postgresql_where so Postgres builds the intended partial index instead of a full one. (#5026)
• frontend: The mobile sidebar trigger stays clickable on regular and custom-agent welcome pages, where multi-line (longer localized) welcome text in a same-z-index overlay could cover the header's tappable area. (#5149)
• subagents: SubagentResult lifecycle timestamps are UTC-aware on every writer, matching the repo-wide convention instead of stamping local wall-clock time on non-UTC hosts. (#5153)
• browser: Background live-frame scheduler tasks retain strong references, so garbage collection can no longer silently stop the Browser Live view from refreshing by stranding a pending guard that was cleared only in a collected task's finally. (#5155)
• runtime: Duplicate on_llm_end callbacks for the same LangChain run id persist one durable llm.ai.response event (replayed usage merged by generation position, first callback canonical), so append-only message APIs no longer return duplicate responses from providers that re-fire the callback with usage populated. (#5187)
• runtime: Terminal finalization completes after a cancellation raised inside the completion hook or task-stop fan-out, so extension observers run and the stream END marker is published before the interruption is re-raised; the finalization tail stays interruptible. (#5191)
• models: A cancelled LLM call releases its owned circuit-breaker recovery probe across provider execution, concurrency admission, and backoff, so subsequent calls no longer see CircuitBreakerOpen after a cancellation; probe ownership is fenced by a per-call token so cancelling an older call cannot release another call's probe. (#5197)
• runtime: The embedded DeerFlowClient keys its graph cache by effective user in every authorization mode and materializes the same user in runtime context, so sequential reuse for different users can no longer serve a graph assembled with another user's prompt and workspace state. (#5206)
• runtime: Cancelled workspace-change snapshot captures drain their already-running scan and clean up the per-run text cache instead of leaking deerflow-workspace-changes-* directories, while metadata-only captures propagate cancellation promptly without waiting on the scan. (#5232, #5234)
• persistence: Gateway startup tolerates a database already migrated to the explicitly-reviewed newer revision (0019_thread_incarnations), so rolling back to this image after a newer deployment stays possible; other unknown revisions, an empty version table, and multiple version rows still fail closed. (#5219)
• community: Tavily Extract results without a title fall back to the result or requested URL as the display heading instead of raising KeyError and discarding usable page content. (#5280)
• uploads: Fenced code blocks are excluded from uploaded-document outlines, so code comments and bold examples inside fences no longer crowd real sections out of the 50-entry heading budget. (#5281)
• subagents: After compaction, the delegation ledger distinguishes execution completion from task acceptance and preserves bounded examples of a completed subagent's unmet and unverified acceptance criteria, so the lead agent repairs the remaining gaps instead of treating the completed result as fully done. (#5287)
• dev: _pick_python() validates interpreter candidates through /usr/bin/env, mirroring how the frontend is launched, so make dev starts the frontend on Windows where Microsoft Store Python stubs satisfy Bash-side probes but not env. (#5181)

Performance

• runtime: Index MemoryRunStore by thread_id and MemoryRunEventStore events by run_id to avoid O(n) scans. (#3562, #3686)
• subagents: Deduplicate streamed AI messages via a seen-id set (O(n²) -> O(n)). (#3687)
• sandbox: Cache LocalSandbox path-rewrite regexes and local-path masking patterns per instance instead of recompiling per search match. (#3648, #3713)
• messages: Index tool-call results per group. (#4411)
• frontend: Coalesce streaming renders to a frame budget instead of per chunk. (#4425)
• frontend: Stop re-deriving message content on every stream chunk. (#4441)
• sandbox: read_file reads only the requested line range from the sandbox instead of fetching the whole file first. (#3824)
• browser: Encode Browser Live progress frames as JPEG to cut progress payload size. (#4836)
• middleware: Inject view_image content via wrap_model_call instead of a checkpointed hidden message, so up to 20 MB of base64 no longer sits in two checkpoints per viewed image and an interrupted run can no longer leave the payload behind. (#5014)
• frontend: Cache settled copy-data derivation across streaming chunks, so each chunk no longer re-derives toolbar/copy text for every settled message. (#5095)
• runtime: Bound gateway memory after terminal runs, stopping the post-GC low-water mark from creeping upward across completed sessions. (#5112)
• frontend: Chat streams request messages-tuple + updates + custom instead of full values state snapshots — the retransmitted historical values messages were ~75% of SSE payload — folding reducer events into rendered state locally while keeping full snapshots only for replay-gap recovery. (#5159)

Security

• skills: Close gaps that let files skip SkillScan in the public skill review gate. The review analyzer passed SkillScan only files it had decoded as text, so executable binaries and nested archives were never checked; it exempted every file anywhere under an evals/fixtures/ directory; and a duplicate archive member or a case-folded name silently overwrote an earlier file before scanning. SkillScan now receives every file byte for byte, only eval fixture SKILL.md samples stay exempt, and path collisions mark the review incomplete. SkillScan also skipped code files containing a NUL or non-UTF-8 byte, so one byte in a comment hid a reverse shell from the review gate, and a NUL byte skipped static analysis at install. Such files now raise package-undecodable-script and are still analyzed, so CRITICAL matches keep blocking. SkillScan's Mach-O detection missed 32-bit little-endian and fat variants that the installer blocks; the installer, export guard, and SkillScan now share one code-file and executable-magic definition. Review snapshots gain a content_base64 field for binary files. (#5431)
• prompt-injection: New input-sanitization middleware defends against prompt-injection, forged framework tags in the input guardrail are blocked, and system context is injected as a SystemMessage for role isolation. (#3662, #4155, #3661)
• prompt-injection: HTML-escape untrusted content rendered into model prompts
  • memory facts and summaries, SOUL.md, subagent descriptions, skill metadata, and the conversation block in the memory-update prompt - and neutralize prompt-injection tags in web_capture tool results. (#4028, #4119, #4137, #4157, #4162, #4099, #4060, #4097, #4128)
• prompt-injection: Escape MindIE tool-response framing. The provider's _fix_messages escaped tool-call names and arguments before rendering them into <tool_call> / <function=...> tags, but the sibling path that wraps a ToolMessage in <tool_response> passed its text through unescaped — and that output arrives largely unsanitized, because the tool-result sanitizer covers only the remote-content tools on its allowlist (web_fetch, web_search, image_search, web_capture) and deliberately leaves local bash / read_file output and differently named MCP tools alone. A literal <tool_response> in a read_file result therefore closed the framing early, and everything after it was presented to the MindIE model as though it sat outside the tool response, so a payload planted in an untrusted file could forge a <system-reminder>. Content is now HTML-escaped with quote=False, matching the tool-call path; the model still decodes the entities back, so only the framing is protected and legitimate results are understood exactly as before. (#4253)
• prompt-injection: Close two input-sanitization bypasses. hide_from_ui and a human name="summary" tell is_genuine_user_message that the framework authored a message, which skips sanitization entirely. Untrusted run input and thread-state writes carrying either marker are now marked server-side and sanitized regardless, so a caller can no longer land a raw <system-reminder> outside the user-input boundary markers that the lead-agent prompt declares trusted framework data. The markers themselves are preserved, so messages that use hide_from_ui only to stay out of the transcript — quoted conversation context, sidecar context, the agent save command, HumanInputCard replies — keep doing that, and trusted internal launchers are unaffected. Sanitization also covers every genuine user message instead of only the newest: the transformation is request-scoped, so a last-turn-only scan neutralized a payload for exactly one model call and then replayed it verbatim from the next turn on. (#5375)
• secrets: Scrub inherited secret environment variables (MYSQL_PWD, REDISCLI_AUTH, abbreviated *_PASS, and Postgres PGPASSFILE) from the skill environment; request-scoped secrets are bound for both slash-activated and autonomously-invoked skills. (#4018, #4026, #3871, #3938)
• web_fetch: SSRF guard for self-hosted providers. (#3942)
• guardrails: An empty allowlist now denies all tools instead of failing open. (#4067)
• authz: Global skills-management endpoints now require admin; the legacy skills mount is gated by user visibility; artifacts honor a trusted owner-user-id header; and the trusted authorization principal is propagated through the runtime. (#3855, #3985, #3982, #4203)
• auth: Persist the csrf_token cookie for the access-token lifetime. (#3872)
• storage: Stop persisting base64 image data in checkpoint state. (#4140)
• mcp: Reject legacy MCP credentials in run metadata. (#4448)
• mcp: Constrain stdio launcher arguments and environment variables at the config API, rejecting launcher flags and env names that could turn an allowlisted npx/uvx server registration into arbitrary code execution. (#4617)
• auth: Harden validation of the post-login next path. (#4587)
• runtime: Honor the LangGraph Server's authenticated user identity across agents, uploads, thread data, memory, and skills, and reject client-supplied auth identity fields. (#4538)
• frontend: Send the session cookie on model, workspace-change, and ranged artifact reads in split-origin deployments. (#4827)
• frontend: Restore sanitization in custom streamdown rehype chains, so artifact markdown previews and the memory settings summary can no longer render hostile HTML such as javascript: links or on* event handlers. (#4987)
• skills: Copy projected skill files instead of hardlinking them, so a sandboxed write can no longer mutate the canonical skill source, and fail closed on a drifted projection namespace on every platform, including Windows. (#4825, #4830)
• scripts: Redact secret-shaped keys (db_pass, signing_key, ...) wherever they appear in bundled config, not only under well-known key names. (#4242)
• sandbox: Sanitize MCP-sourced tool results through the same trust boundary as the built-in web tools, so a hostile or compromised MCP server can no longer hand the model forged <system-reminder> or user-input boundary tags. (#4839)
• sandbox: Harden local Docker sandbox containers: published ports bind the Docker bridge gateway instead of 0.0.0.0 when the sandbox host is non-loopback (DEER_FLOW_SANDBOX_BIND_HOST=0.0.0.0 restores the broad bind), Docker's default seccomp profile replaces unconditional seccomp=unconfined (opt back in with DEER_FLOW_SANDBOX_SECCOMP_UNCONFINED=1), and containers drop all capabilities, get no-new-privileges, and run with bounded resources. (#4986)
• authz: Enforce run-create authorization on stateless stream/wait endpoints (runs:create), and require both threads:write and runs:create for scheduled-task create, update, resume, and manual-trigger mutations. (#5030)
• authz: Re-check the authorization policy before reusing a persisted sandbox, so a revoked sandbox:execute grant takes effect on the next sandbox-backed turn instead of outliving the policy in the cached sandbox. (#5006)
• skills: Enforce custom-Agent skill allowlists at the sandbox filesystem level: an explicit skills policy materializes a signed per-user/thread skills view, so a custom agent with shell or file tools can no longer read skills its policy excludes. (#5077)
• runs: Reject cancel/rollback actions on GET stream joins with 405 Method Not Allowed - cancel-then-stream is a POST operation - closing a state change that CSRF middleware deliberately exempted on safe methods; action-less GET joins are unchanged. (#5092)
• lark: Lark CLI credential trees on Windows enforce private ACLs (gateway-SID-only protected DACL, reparse-point rejection, handle-relative traversal), extending the POSIX 0700/0600 confidentiality contract against inherited grants, junction redirection, hard-link aliasing, and TOCTOU replacement. (#5141)
• sandbox: SSH_AUTH_SOCK is scrubbed from the sandbox subprocess environment — inheriting the host ssh-agent socket lets sandboxed code sign and authenticate with every key the agent holds — unless a skill explicitly declares it via required-secrets. (#5145)
• artifacts: Serve XML artifacts as download attachments like HTML and SVG. GET /api/threads/{id}/artifacts/{path} rendered .xml, .xsl, and .rdf files — and +xml types such as .rss wherever the host MIME database maps them — inline in the application origin, so an XML document with an XHTML-namespaced <script>, written by a prompt-injected agent and opened from a chat link, could call the API with the viewer's session. Every XML MIME type (text/xml, application/xml, text/xsl, any +xml subtype) is now treated as active content, including .skill archive members; the artifacts panel keeps previewing XML through its ranged fetch. (#5353)

Documentation

• docs: Clarify how LocalSandboxProvider resolves sandbox.mounts[].host_path under production Docker, with gateway bind-mount and config examples. (#3833)
• docs: Document that Crawl4AI >= 0.9 requires a bearer token. (#4518)
• docs: Document the GitHub inbound-dedupe TTL semantics, including what redeliveries are not deduped, and tighten the redelivery tests. (#4274)
• docs: Update the agent AGENTS.md and ARCHITECTURE.md guides. (#4817)
• docs: Document the Honcho memory backend with a dedicated guide and a long-term memory section entry in the README. (#4822)
• docs: Align custom-agent documentation with the API across the English and Chinese agents/threads/lead-agent pages: the required ASCII name request field, lowercase storage, /api/agents/check name-availability behavior, and no auto-derived slug from display_name. (#4944)
• docs: Restructure the subagent documentation into an eleven-chapter user manual under harness/subagents/ in both languages: concepts, quick start, the catalog, delegating work, results and acceptance, limits and capacity, sandbox and isolation, observability, troubleshooting by symptom, developer integration, and a reference appendix with the June to September 2026 change log. The former single page becomes the section index, so existing page links keep working; deep links to sections of the old page now land on the index. (#5761)
• docs: Add an extension developer manual under harness/extensions/ in both languages, covering the deerflow-extension-api 0.2.1 contract: when to write an extension, a quick start, the runtime model, middleware placements, lifecycle and observer hooks, services and routes, the run evidence reader, operating extensions, troubleshooting by error message, and a reference of every public name with the contract's version history. Also correct stale descriptions of the contribution kinds and of run evidence metadata redaction in AGENTS.md. (#5769)

Internal

• tests: Migrate frontend unit tests to rstest and run hook-level tests in a DOM environment. (#3703, #4453)
• tests: Require explicit opt-in for live client tests. (#4482)
• tests: Rename the LLM-error test stand-in instead of the shared FakeError. (#4744)
• tests: Replace the magic unwritable absolute path in tool-output tests with a self-constructed failure condition. (#4722)
• tests: Add multi-turn message-stream invariants as graph integration tests. (#3708)
• tests: Add trace-based behavioral tests with Monocle Test Tools, asserting agent routing, tool calls, and token/duration cost. (#4025)
• tests: Cover passive skill tool visibility in the MCP layer. (#4247)
• tests: Add SQL and concurrent-reconciler coverage for lease-aware orphan recovery. (#4427)
• tests: Restore memory updater regression coverage. (#4490)
• tests: Lock in POST logout from the gateway-offline banner. (#4506)
• tests: Document known instance-client false negatives in the SkillScan tests. (#4644)
• refactor: Extract frontend placeholder detection into a tested utility. (#3783)
• refactor: Consolidate E2B client lifecycle helpers and reuse the kill helper during warm-pool eviction. (#4262, #4298)
• refactor: Name the E2B capacity-ledger meta-field count so the admission offset is explicit. (#4764)
• dev: Trace self/cls attribute chains and local aliases in the blocking-IO detector's call graph, closing false negatives. (#4200)
• ci: Publish the lark-cli-init and lark-broker images. (#4558)
• dev: Route host-side pnpm consumers through a shared runner with a Corepack fallback so local workflows work without a pnpm shim. (#4405)
• bench: Add an isolated checkpoint channel-mode benchmark comparing full and delta across latency, storage, and replay metrics. (#4395)
• deps: Bump cryptography 49.0.0 -> 50.0.0, postcss 8.4.31 -> 8.5.25, h2 4.3.0 -> 4.4.1, langgraph-checkpoint-sqlite and langgraph-checkpoint-postgres 3.1.0 -> 3.1.1, nanoid 5.1.6 -> 5.1.16, h3 1.15.6 -> 1.15.9, and next 16.2.11 -> 16.3.3. The next bump closes two unauthenticated remote code execution advisories — one in the Image Optimization API's AVIF path, one on Windows-hosted servers — while h3 stops a double-encoded dot segment from traversing out of the static route. (#4211, #4681, #4683, #4737, #4738, #4747, #4748, #5377)
• bench: Add a reproducible hybrid memory-eviction evaluation under backend/scripts/benchmark/deermem_eviction/ with a deterministic, blind-by-construction grader for the #4789 policy. (#4810)
• bench: Measure Postgres checkpoint/blob/write storage growth in the checkpoint benchmark alongside memory and SQLite. (#5051)
• tests: Exclude tests/blocking_io/ from make test; the dedicated make test-blocking-io suite (and its CI workflow) remains the owner. (#5105)
• refactor: Share sandbox identity derivation and acquire serialization across the five remote sandbox providers (RFC #4741), replacing five per-provider lock tables that grew unboundedly with process lifetime; derived ids are pinned byte-identical by per-provider golden vectors. (#5089)
• ci: Split the backend unit-test workflow into four parallel shards — each on its own runner with isolated Postgres/Redis — using pytest-split with a committed duration baseline and failing closed when the baseline is missing; make test remains the canonical full offline suite. (#5137)
• dev: Launch the Playwright webServer's Next.js through pnpm exec, so Windows E2E runs resolve the platform package binary instead of failing on the extensionless POSIX shim. (#5185)
• tests: Skip the POSIX mode-bit skill-permission assertions on Windows, where the chmod contract is unobservable, so Windows contributors can reach a green backend-suite baseline. (#5244)
• tests: Pin the composer's skill suggestions against an empty skill catalog (RFC #4063 Phase 4): a caller whose skills policy allows nothing — or a fresh install with no skills — receives [] from GET /api/skills, and the composer must degrade to a builtin-only dropdown, never a broken or fully vanishing one. New tests drive the matcher and mount the real InputBox with an empty catalog: typing / offers exactly the builtin commands, and an unmatched query renders no listbox. No production code changed; all four useSkills() consumers were audited and already degrade gracefully. (#5490)

2.0.0 — 2026-06-15

DeerFlow 2.0 is a ground-up rewrite around a "super agent" harness with sub-agents, persistent memory, sandbox execution, and an extensible skills/tools system. It shares no code with the 1.x line, which now lives on the main-1.x branch.

This release closes milestone 2.0.0 with 180 merged pull requests since the first 2.0 milestone tag.

⚠ Breaking changes

• harness: Hydrate runs from RunStore and persist interrupted status. Run cancellation/multitask semantics now require a working RunStore on the worker that owns the run; cross-worker cancels return 409 instead of silently appearing successful. (#2932)

Added

Agents & runtime

• agent: Custom-agent self-updates with user isolation — agents can persist edits to their own SOUL.md / config.yaml from inside a normal chat. (#2713)
• loop-detection: Make loop detection configurable with per-tool frequency overrides; keep configurable on/off switch. (#2586, #2711)
• loop-detection: Defer warning injection so detector pairs cleanly with tool-call lifecycle. (#2752)
• run: Propagate model_name from the gateway request through the runtime and persistence stack into the SQLite-backed store. (#2775)
• subagents: Stream subagent token usage to the header via terminal task events. (#2882)
• memory: Add memory.token_counting config to opt out of tiktoken for network-restricted deployments. (#3465)
• suggest: Make AI follow-up question suggestions optional. (#3591)

Models & integrations

• models: Add StepFun reasoning model adapter. (#3461)
• community: Add Brave Search web search tool. (#3528)
• channels: Enhance Discord with mention-only mode, thread routing, and typing indicators. (#2842)
• im: Add user-owned IM channel connections — users can bind their own Slack/Telegram/Discord/Feishu/DingTalk/WeChat/WeCom accounts on top of the operator-configured bots. (#3487)
• models: Add patched MiMo reasoning content support. (#3298)
• models: Add MiniMax provider for image/video/podcast skills plus a new music-generation skill. (#3437)
• community: Add SearXNG and Browserless web search/fetch tools. (#3451)
• community: Add Serper Google Images provider for image_search. (#3575)
• channels: Stream Telegram agent replies by editing the placeholder message in place. (#3534)

Observability

• trace: Set the LangGraph trace name to lead_agent (or the custom agent's agent_name) for cleaner Langfuse/LangSmith traces. (#3101)
• frontend: Refine token usage display modes. (#2329)
• defaults: Enable token usage tracking by default. (#2841)
• defaults: Raise default summarization trigger threshold. (#3174)
• trace: Attribute subagent spans to the parent thread's Langfuse trace. (#3611)

Skills

• skill: Add blocking-io-guard skill for blocking-IO triage and runtime anchors. (#3503)
• skill: Add maintainer issue and PR workflow skill. (#3554)
• skill: Strengthen the maintainer orchestrator review workflow. (#3606)

Performance

• harness: Push thread metadata filters into SQL instead of post-filtering in Python. (#2865)
• runtime: Index runs by thread_id to avoid O(n) scans in RunManager. (#3499)
• runtime: Index messages in MemoryRunEventStore to avoid O(n) scans. (#3531)
• persistence: Cache Base.to_dict column reflection per class. (#3654)
• sandbox: Speed up should_ignore_name in glob/grep walks. (#3657)

Security

• upload: Reject symlinked upload destinations. (#2623)
• uploads: Add Windows support for safe symlink-protected uploads. (#2794)
• mcp: Mask sensitive values in MCP config API responses. (#2667)
• mcp: Harden the MCP config endpoint against malformed input. (#3425)
• auth: Reject cross-site auth POSTs. (#2740)
• gateway: Cap skill artifact preview decompression to prevent zip-bomb-style abuse. (#2963)
• sandbox: Mount the host Docker socket only in aio (DooD) sandbox mode. (#3517)
• sandbox: Do not bind-mount host CLI auth dirs by default. (#3521)

Fixed

Runtime, gateway & persistence

• runtime: Rollback restore checkpoint now supersedes newer checkpoints. (#2582)
• runtime: Persist run message summaries. (#2850)
• runtime: Bound write_file execution-failure observations to keep failure traces from blowing out the context. (#3133)
• runtime: Protect the sync singleton's init and reset paths. (#3413)
• runtime: Avoid PostgreSQL aggregate FOR UPDATE on run events. (#2962)
• runs: Restore historical runs from persistent store after a gateway restart. (#2989)
• gateway: Return ISO 8601 timestamps from threads endpoints. (#2599)
• gateway: Make cancel idempotent for already-interrupted runs. (#3058)
• gateway: Split stream_existing_run into per-method routes for unique OpenAPI operationIds. (#3228)
• events: Serialize structured DB event content. (#2762)
• persistence: Emit timezone-aware timestamps from SQLite-backed stores. (#3130)
• persistence: Reuse token usage model grouping expression. (#2910)
• runs: Ignore stale run reconnect conflicts. (#3284)
• nginx: Defer CORS to the gateway allowlist instead of double-applying it. (#2861)
• persistence: Fix runtime journal run lifecycle events. (#3470)
• gateway: Enforce thread ownership on stateless run endpoints. (#3473)
• runtime: Propagate interrupt through SSE values events for the LangGraph SDK. (#3605)
• serialization: Strip base64 image data from streamed values events. (#3631)
• history: Strip base64 image data from REST endpoint responses. (#3535)
• gateway: Attribute token usage to the actual models. (#3658)

Agents, subagents & middleware

• subagents: Make subagent timeout terminal state atomic. (#2583)
• subagents: Use model override for tools and middleware. (#2641)
• subagents: Consolidate system_prompt and skills into a single SystemMessage. (#2701)
• subagent: Isolate subagents from the parent run's checkpointer. (#3559)
• agents: Make update_agent honor runtime.context user_id like setup_agent does. (#2867)
• agents: Resolve duplicate todos channel type conflict in TodoMiddleware. (#3200)
• agents: Offload blocking filesystem IO in the custom-agent router off the event loop. (#3457)
• agents: Keep new agent bootstrap in user scope. (#2784)
• loop-detection: Keep tool-call pairing on warn injection. (#2725)
• middleware: Sync raw tool-call metadata. (#2757)
• middleware: Handle invalid tool calls in dangling pairing middleware. (#2891)
• middleware: Prevent todo completion reminder IM-message leak. (#2907)
• middleware: Normalize tool result adjacency before model calls. (#2939)
• agents: Require config.yaml in resolve_agent_dir to skip memory-only directories. (#3481)
• agents: Sync agent_name across context/configurable and reject empty soul. (#3553)
• middleware: Offload the uploads scan in UploadsMiddleware off the event loop. (#3311)
• middleware: Offload memory injection off the event loop to prevent tiktoken blocking. (#3411)
• middleware: Externalize oversized tool output into the sandbox for non-mounted sandboxes. (#3417)
• middleware: Preserve the sandbox reducer in middleware state. (#3629)
• subagents: Raise general-purpose max_turns to 150 and default timeout to 30 min. (#3610)

Memory & tracing

• memory: Replace short-lived asyncio.run() with a persistent event loop. (#2627)
• memory: Isolate queued memory updates by agent. (#2941)
• memory: Parse wrapped memory-update JSON responses. (#3252)
• tracing: Propagate session_id and user_id into Langfuse traces. (#2944)
• trace: Decode unicode escape sequences in non-ASCII memory trace info. (#3104)

Tools, sandbox & MCP

• mcp: Fix env resolution in MCP config lists. (#2556)
• models: Record Codex token usage in usage_metadata. (#2585)
• sandbox: Supplement list_running in RemoteSandboxBackend. (#2716)
• sandbox: Disable MSYS path conversion for Git Bash on Windows. (#2766)
• sandbox: Avoid blocking sandbox readiness polling. (#2822)
• sandbox: Uphold the /mnt/user-data contract at the Sandbox API boundary. (#2881)
• sandbox: Scope provisioner PVC data by user. (#2973)
• sandbox: Merge idempotent sandbox state updates. (#3518)
• tools: Introduce Runtime type alias to eliminate Pydantic serialization warnings. (#2774)
• tools: Preserve tool_search promotions across re-entrant get_available_tools. (#2885)
• harness: Wrap async-only config tools for sync client execution. (#2878)
• harness: Wrap all async-only tools for sync clients. (#2935)
• tool-search: Reliably hide deferred MCP schemas by removing the ContextVar. (#3342)
• search: Fix DDGS Wikipedia region handling. (#3423)
• web_fetch: Support a proxy for the Jina reader in restricted networks. (#3430)
• sandbox: Persist lazily-acquired sandbox state via Command. (#3464)
• sandbox: Fix stale AIO sandbox cache reuse. (#3494)
• sandbox: Create a shell session before retrying on a fresh id. (#3577)
• sandbox: Stop flagging string-literal path fragments as unsafe absolute paths. (#3623)
• sandbox: Return an actionable hint when read_file hits a binary file. (#3624)
• mcp: Make stdio MCP-produced files resolvable via virtual sandbox paths. (#3600)
• mcp: Surface admin-required state on the settings tools page. (#3533)
• mcp: Add a tools cache reset endpoint. (#3602)
• uploads: Fix the upload file size contract. (#3408)

Skills & channels

• skills: Enforce allowed-tools metadata. (#2626)
• skills: Harden slash skill activation across chat channels. (#3466)
• skills: Fix custom skill install permissions. (#3241)
• channels: Authenticate gateway command requests. (#2742)
• skills: Surface the offending line and a quoting hint on SKILL.md YAML errors. (#3335)
• skills: Keep skill archive installation off the event loop. (#3505)
• channels: Ignore hidden control messages when extracting replies. (#3270)
• channels: Reload config on channel restart. (#3514)
• channels: Surface WeCom WebSocket connection failures. (#3526)
• channels: Close the Discord file handle after upload. (#3561)
• channels: Require a bound identity for user-owned IM messages. (#3578)
• channels: Scope IM files and helper commands to the owner. (#3579)
• channels: Make runtime provider state authoritative. (#3580)
• channels: Harden runtime credential management APIs. (#3581)
• channels: Make the channel connect flow deterministic. (#3582)
• channels: Centralize shared channel retry helpers. (#3583)
• channels: Add operational guardrails. (#3584)
• channels: Unsubscribe channel listeners by equality. (#3608)

Auth

• auth: Replace setup-status 429 rate limit with a cached response. (#2915)
• auth: Persist auto-generated JWT secret so it survives restarts. (#2933)
• auth: Align auth-disabled mode with mock history loading. (#3471)

Frontend

• frontend: Restore localhost fallback for getGatewayConfig in prod mode. (#2718)
• chat: Prevent the first user message from being swallowed in new conversations. (#2731)
• frontend: Use backend thread token usage for the header total. (#2800)
• frontend: Wait for async chat submit before clearing the input. (#2940)
• frontend: Resolve login page flickering and the resize-observer loop. (#2954)
• frontend: Deduplicate restored thread messages. (#2958)
• frontend: Avoid duplicate optimistic user message. (#3002)
• frontend: Hide the copy button for streaming assistant messages. (#3176)
• frontend: Show a new thread in the sidebar immediately on creation. (#3283)
• frontend: Isolate new chat thread messages. (#3508)
• frontend: Cap deeply nested list indentation to prevent render crashes. (#3393, #3570)
• token-usage: Dedupe token usage aggregation by message id. (#2770)
• frontend: Fall back to Streamdown clipboard copy. (#3397)
• frontend: Remove the Backspace shortcut for deleting prompt attachments. (#3410)
• frontend: Restructure the Memory settings toolbar into two rows. (#3433)
• suggestions: Strip inline <think> reasoning before parsing follow-up questions. (#3435)
• frontend: Stop fetching follow-up suggestions when they are disabled. (#3599)
• frontend: Paginate the workspace chat list beyond 50 threads. (#3485)
• frontend: Prevent user message bubble overflow with long unbreakable strings. (#3488)
• frontend: Keep the workspace interactive when the SSR auth probe cannot reach the gateway. (#3495)
• frontend: Render user messages as plain text and cap blockquote nesting. (#3502)
• frontend: Reset the active chat after deletion. (#3519)
• frontend: Improve the mobile workspace layout. (#3646)
• frontend: Render full content for multi-part AI messages. (#3649)

Build, deploy, scripts & config

• packaging: Add postgres extra for store/checkpointer support; clarify install guidance. (#2584)
• harness: Resolve runtime paths from the project root. (#2642)
• docker: Force nginx to resolve upstream names at request time. (#2717)
• docker: Default Gateway to a single worker to prevent multi-worker breakage. (#3475)
• scripts: Preserve uv extras across make dev restarts. (#2767, #2754)
• scripts: Clean up local nginx on stop. (#3005)
• deploy: Fall back to python / openssl when python3 is absent for secret generation. (#3074)
• config: Make the reload boundary discoverable from code. (#3144, #3153)
• replay-e2e: Key replay fixtures by caller and conversation. (#3453)
• setup: Refresh LLM provider wizard defaults. (#3421)
• config: Coerce null config.yaml list sections to an empty list. (#3434)
• scripts: Exclude runtime state from gateway reload. (#3426)
• scripts: Create the backend/sandbox dir before the uvicorn reload-exclude. (#3460)
• scripts: Stop next-server correctly after make start-daemon. (#3498)
• makefile: Fix per-commit hooks installation. (#3569)
• replay-e2e: Match replay by conversation, not the living system prompt. (#3436)

Changed

• provider (refactor): Share assistant payload replay matching across providers. (#3307)
• lead-agent (refactor): Make build_middlewares public to drop the last cross-module private import. (#3458)
• todo (refactor): Remove the unused completion reminder counter. (#3530)

Documentation

• Document blocking-IO detection usage and maintenance. (#3233)
• Clean standalone LangGraph server remnants from docs. (#3301)
• Add AI assistance disclosure to the PR template and CONTRIBUTING. (#3398)
• Document custom AIO sandbox images. (#3548)

Internal

• dev: Add async/thread boundary detector. (#2936)
• runtime: Add lifecycle end-to-end coverage. (#2946)
• windows: Add PYTHONIOENCODING and PYTHONUTF8 to backend Makefile targets. (#3069)
• blocking-io: Fail-loud repo-root resolution and shared detector CLI shim. (#3512)
• runtime: Add a Blockbuster runtime anchor for JsonlRunEventStore async IO. (#3313)
• ci: Consolidate PR/issue labeling and fix the reviewing-job crash and label thrash. (#3455)