Repo Mapping Skill

Build and maintain a cached AST-based map of repository symbols and imports using ast-grep.

Primary Responsibilities

1. Generate map on demand (/repo-map init)
2. Update map incrementally (/repo-map update)
3. Check status and staleness (/repo-map status)
4. Validate output with the map-validator agent

Core Data Contract

Repo map is stored in the platform state directory:

• Claude Code: .claude/repo-map.json
• OpenCode: .opencode/repo-map.json
• Codex CLI: .codex/repo-map.json

Minimal structure:

{
  "version": "1.0.0",
  "generated": "2026-01-25T12:00:00Z",
  "updated": "2026-01-25T12:05:00Z",
  "git": { "commit": "abc123", "branch": "main" },
  "project": { "languages": ["typescript", "python"] },
  "stats": { "totalFiles": 142, "totalSymbols": 847 },
  "files": {
    "src/auth/login.ts": {
      "hash": "deadbeef1234abcd",
      "language": "typescript",
      "symbols": { "exports": [], "functions": [], "classes": [] },
      "imports": [ { "source": "./utils", "kind": "named" } ]
    }
  }
}

Behavior Rules

• Never run ast-grep without user approval if it is not installed
• Never install dependencies without explicit user consent
• Always validate map output with map-validator after init/update
• Prefer incremental update unless map is stale or history rewritten

When to Suggest Repo Map

If a user asks for drift detection, documentation alignment, or repo analysis and repo-map is missing:

Repo map not found. For better analysis, run:
  /repo-map init

Staleness Signals

• Map commit not found (rebased)
• Branch changed
• Git hooks marked stale
• Commits behind HEAD

Output Expectations

Keep outputs concise:

• init/update: file count, symbol count, commit, warnings
• status: staleness, commits behind, last updated