feat: add /opsx:ff command for fast-forward artifact creation

Adds a new fast-forward command that creates all artifacts needed for
implementation in one go, instead of stepping through them individually.

Changes:
- Add `applyRequires` field to status JSON output (shows which artifacts
  are required before the apply phase can begin)
- Add skill template for openspec-ff-change
- Add command template for /opsx:ff slash command
- Register templates in artifact-workflow setup command

The fast-forward command uses the schema's `apply.requires` configuration
to determine when to stop creating artifacts, making it schema-agnostic.

src/commands/artifact-workflow.ts

@@ -28,7 +28,7 @@ import {
   type SchemaInfo,
 } from '../core/artifact-graph/index.js';
 import { createChange, validateChangeName } from '../utils/change-utils.js';
-import { getNewChangeSkillTemplate, getContinueChangeSkillTemplate, getApplyChangeSkillTemplate, getOpsxNewCommandTemplate, getOpsxContinueCommandTemplate, getOpsxApplyCommandTemplate } from '../core/templates/skill-templates.js';
+import { getNewChangeSkillTemplate, getContinueChangeSkillTemplate, getApplyChangeSkillTemplate, getFfChangeSkillTemplate, getOpsxNewCommandTemplate, getOpsxContinueCommandTemplate, getOpsxApplyCommandTemplate, getOpsxFfCommandTemplate } from '../core/templates/skill-templates.js';
 import { FileSystemUtils } from '../utils/file-system.js';
 
 // -----------------------------------------------------------------------------
@@ -796,17 +796,20 @@ async function artifactExperimentalSetupCommand(): Promise<void> {
     const newChangeSkill = getNewChangeSkillTemplate();
     const continueChangeSkill = getContinueChangeSkillTemplate();
     const applyChangeSkill = getApplyChangeSkillTemplate();
+    const ffChangeSkill = getFfChangeSkillTemplate();
 
     // Get command templates
     const newCommand = getOpsxNewCommandTemplate();
     const continueCommand = getOpsxContinueCommandTemplate();
     const applyCommand = getOpsxApplyCommandTemplate();
+    const ffCommand = getOpsxFfCommandTemplate();
 
     // Create skill directories and SKILL.md files
     const skills = [
       { template: newChangeSkill, dirName: 'openspec-new-change' },
       { template: continueChangeSkill, dirName: 'openspec-continue-change' },
       { template: applyChangeSkill, dirName: 'openspec-apply-change' },
+      { template: ffChangeSkill, dirName: 'openspec-ff-change' },
     ];
 
     const createdSkillFiles: string[] = [];
@@ -834,6 +837,7 @@ ${template.instructions}
       { template: newCommand, fileName: 'new.md' },
       { template: continueCommand, fileName: 'continue.md' },
       { template: applyCommand, fileName: 'apply.md' },
+      { template: ffCommand, fileName: 'ff.md' },
     ];
 
     const createdCommandFiles: string[] = [];
@@ -889,6 +893,7 @@ ${template.content}
     console.log('  • /opsx:new - Start a new change');
     console.log('  • /opsx:continue - Create the next artifact');
     console.log('  • /opsx:apply - Implement tasks');
+    console.log('  • /opsx:ff - Fast-forward: create all artifacts at once');
     console.log();
     console.log(chalk.yellow('💡 This is an experimental feature.'));
     console.log('   Feedback welcome at: https://github.com/Fission-AI/OpenSpec/issues');

src/core/artifact-graph/instruction-loader.ts

@@ -99,6 +99,8 @@ export interface ChangeStatus {
   schemaName: string;
   /** Whether all artifacts are complete */
   isComplete: boolean;
+  /** Artifact IDs required before apply phase (from schema's apply.requires) */
+  applyRequires: string[];
   /** Status of each artifact */
   artifacts: ArtifactStatus[];
 }
@@ -252,6 +254,10 @@ function getUnlockedArtifacts(graph: ArtifactGraph, artifactId: string): string[
  * @returns Formatted change status
  */
 export function formatChangeStatus(context: ChangeContext): ChangeStatus {
+  // Load schema to get apply phase configuration
+  const schema = resolveSchema(context.schemaName);
+  const applyRequires = schema.apply?.requires ?? schema.artifacts.map(a => a.id);
+
   const artifacts = context.graph.getAllArtifacts();
   const ready = new Set(context.graph.getNextArtifacts(context.completed));
   const blocked = context.graph.getBlocked(context.completed);
@@ -290,6 +296,7 @@ export function formatChangeStatus(context: ChangeContext): ChangeStatus {
     changeName: context.changeName,
     schemaName: context.schemaName,
     isComplete: context.graph.isComplete(context.completed),
+    applyRequires,
     artifacts: artifactStatuses,
   };
 }

src/core/templates/skill-templates.ts

@@ -360,6 +360,101 @@ This skill supports the "actions on a change" model:
   };
 }
 
+/**
+ * Template for openspec-ff-change skill
+ * Fast-forward through artifact creation
+ */
+export function getFfChangeSkillTemplate(): SkillTemplate {
+  return {
+    name: 'openspec-ff-change',
+    description: 'Fast-forward through OpenSpec artifact creation. Use when the user wants to quickly create all artifacts needed for implementation without stepping through each one individually.',
+    instructions: `Fast-forward through artifact creation - generate everything needed to start implementation in one go.
+
+**Input**: The user's request should include a change name (kebab-case) OR a description of what they want to build.
+
+**Steps**
+
+1. **If no clear input provided, ask what they want to build**
+
+   Use the **AskUserQuestion tool** (open-ended, no preset options) to ask:
+   > "What change do you want to work on? Describe what you want to build or fix."
+
+   From their description, derive a kebab-case name (e.g., "add user authentication" → \`add-user-auth\`).
+
+   **IMPORTANT**: Do NOT proceed without understanding what the user wants to build.
+
+2. **Create the change directory**
+   \`\`\`bash
+   openspec new change "<name>"
+   \`\`\`
+   This creates a scaffolded change at \`openspec/changes/<name>/\`.
+
+3. **Get the artifact build order**
+   \`\`\`bash
+   openspec status --change "<name>" --json
+   \`\`\`
+   Parse the JSON to get:
+   - \`applyRequires\`: array of artifact IDs needed before implementation (e.g., \`["tasks"]\`)
+   - \`artifacts\`: list of all artifacts with their status and dependencies
+
+4. **Create artifacts in sequence until apply-ready**
+
+   Use the **TodoWrite tool** to track progress through the artifacts.
+
+   Loop through artifacts in dependency order (artifacts with no pending dependencies first):
+
+   a. **For each artifact that is \`ready\` (dependencies satisfied)**:
+      - Get instructions:
+        \`\`\`bash
+        openspec instructions <artifact-id> --change "<name>" --json
+        \`\`\`
+      - The instructions JSON includes:
+        - \`template\`: The template content to use
+        - \`instruction\`: Schema-specific guidance for this artifact type
+        - \`outputPath\`: Where to write the artifact
+        - \`dependencies\`: Completed artifacts to read for context
+      - Read any completed dependency files for context
+      - Create the artifact file following the schema's \`instruction\`
+      - Show brief progress: "✓ Created <artifact-id>"
+
+   b. **Continue until all \`applyRequires\` artifacts are complete**
+      - After creating each artifact, re-run \`openspec status --change "<name>" --json\`
+      - Check if every artifact ID in \`applyRequires\` has \`status: "done"\` in the artifacts array
+      - Stop when all \`applyRequires\` artifacts are done
+
+   c. **If an artifact requires user input** (unclear context):
+      - Use **AskUserQuestion tool** to clarify
+      - Then continue with creation
+
+5. **Show final status**
+   \`\`\`bash
+   openspec status --change "<name>"
+   \`\`\`
+
+**Output**
+
+After completing all artifacts, summarize:
+- Change name and location
+- List of artifacts created with brief descriptions
+- What's ready: "All artifacts created! Ready for implementation."
+- Prompt: "Run \`/opsx:apply\` or ask me to implement to start working on the tasks."
+
+**Artifact Creation Guidelines**
+
+- Follow the \`instruction\` field from \`openspec instructions\` for each artifact type
+- The schema defines what each artifact should contain - follow it
+- Read dependency artifacts for context before creating new ones
+- Use the \`template\` as a starting point, filling in based on context
+
+**Guardrails**
+- Create ALL artifacts needed for implementation (as defined by schema's \`apply.requires\`)
+- Always read dependency artifacts before creating a new one
+- If context is critically unclear, ask the user - but prefer making reasonable decisions to keep momentum
+- If a change with that name already exists, suggest continuing that change instead
+- Verify each artifact file exists after writing before proceeding to next`
+  };
+}
+
 // -----------------------------------------------------------------------------
 // Slash Command Templates
 // -----------------------------------------------------------------------------
@@ -719,3 +814,100 @@ This skill supports the "actions on a change" model:
 - **Allows artifact updates**: If implementation reveals design issues, suggest updating artifacts - not phase-locked, work fluidly`
   };
 }
+
+
+/**
+ * Template for /opsx:ff slash command
+ */
+export function getOpsxFfCommandTemplate(): CommandTemplate {
+  return {
+    name: 'OPSX: Fast Forward',
+    description: 'Create a change and generate all artifacts needed for implementation in one go',
+    category: 'Workflow',
+    tags: ['workflow', 'artifacts', 'experimental'],
+    content: `Fast-forward through artifact creation - generate everything needed to start implementation.
+
+**Input**: The argument after \`/opsx:ff\` is the change name (kebab-case), OR a description of what the user wants to build.
+
+**Steps**
+
+1. **If no input provided, ask what they want to build**
+
+   Use the **AskUserQuestion tool** (open-ended, no preset options) to ask:
+   > "What change do you want to work on? Describe what you want to build or fix."
+
+   From their description, derive a kebab-case name (e.g., "add user authentication" → \`add-user-auth\`).
+
+   **IMPORTANT**: Do NOT proceed without understanding what the user wants to build.
+
+2. **Create the change directory**
+   \`\`\`bash
+   openspec new change "<name>"
+   \`\`\`
+   This creates a scaffolded change at \`openspec/changes/<name>/\`.
+
+3. **Get the artifact build order**
+   \`\`\`bash
+   openspec status --change "<name>" --json
+   \`\`\`
+   Parse the JSON to get:
+   - \`applyRequires\`: array of artifact IDs needed before implementation (e.g., \`["tasks"]\`)
+   - \`artifacts\`: list of all artifacts with their status and dependencies
+
+4. **Create artifacts in sequence until apply-ready**
+
+   Use the **TodoWrite tool** to track progress through the artifacts.
+
+   Loop through artifacts in dependency order (artifacts with no pending dependencies first):
+
+   a. **For each artifact that is \`ready\` (dependencies satisfied)**:
+      - Get instructions:
+        \`\`\`bash
+        openspec instructions <artifact-id> --change "<name>" --json
+        \`\`\`
+      - The instructions JSON includes:
+        - \`template\`: The template content to use
+        - \`instruction\`: Schema-specific guidance for this artifact type
+        - \`outputPath\`: Where to write the artifact
+        - \`dependencies\`: Completed artifacts to read for context
+      - Read any completed dependency files for context
+      - Create the artifact file following the schema's \`instruction\`
+      - Show brief progress: "✓ Created <artifact-id>"
+
+   b. **Continue until all \`applyRequires\` artifacts are complete**
+      - After creating each artifact, re-run \`openspec status --change "<name>" --json\`
+      - Check if every artifact ID in \`applyRequires\` has \`status: "done"\` in the artifacts array
+      - Stop when all \`applyRequires\` artifacts are done
+
+   c. **If an artifact requires user input** (unclear context):
+      - Use **AskUserQuestion tool** to clarify
+      - Then continue with creation
+
+5. **Show final status**
+   \`\`\`bash
+   openspec status --change "<name>"
+   \`\`\`
+
+**Output**
+
+After completing all artifacts, summarize:
+- Change name and location
+- List of artifacts created with brief descriptions
+- What's ready: "All artifacts created! Ready for implementation."
+- Prompt: "Run \`/opsx:apply\` to start implementing."
+
+**Artifact Creation Guidelines**
+
+- Follow the \`instruction\` field from \`openspec instructions\` for each artifact type
+- The schema defines what each artifact should contain - follow it
+- Read dependency artifacts for context before creating new ones
+- Use the \`template\` as a starting point, filling in based on context
+
+**Guardrails**
+- Create ALL artifacts needed for implementation (as defined by schema's \`apply.requires\`)
+- Always read dependency artifacts before creating a new one
+- If context is critically unclear, ask the user - but prefer making reasonable decisions to keep momentum
+- If a change with that name already exists, ask if user wants to continue it or create a new one
+- Verify each artifact file exists after writing before proceeding to next`
+  };
+}