Codex, Gemini CLI, and Antigravity all gained lifecycle-hook support, so give
them the same non-blocking SessionStart reminder Claude Code has — stdout is
injected as session context, nudging the agent to use codebase-memory-mcp
graph tools before grep.
- Codex: append a sentinel-delimited [[hooks.SessionStart]] block to
~/.codex/config.toml (idempotent upsert, preserves other content, removable).
- Gemini CLI: SessionStart hook in ~/.gemini/settings.json, reusing the shared
JSON hook upsert (alongside the existing BeforeTool reminder).
- Antigravity: same JSON hook in ~/.gemini/antigravity/settings.json (it shares
Gemini hook semantics).
The reminder command is written to be valid both as a TOML single-quoted
literal and a JSON string (no single quotes, no newlines). Wired into install,
uninstall, and the install --plan receipt. remove_hooks_json now prunes an
emptied event key so removal leaves no stale "<Event>": [] cruft. README
Multi-Agent table updated. Tests cover Codex upsert/idempotency/removal and
Gemini parity.
Martin Vogel
6c71244e63