claude-plugin-codex: Instructions file for Claude Code

claude-plugin-codex

A Codex CLI plugin that delegates work to the local Claude Code CLI — the mirror image of OpenAI's codex-plugin-cc. Codex users invoke it by mention (@claude review, @claude plan, @claude implement, @claude rescue, @claude transfer, ...) or as /claude:<name> in codex exec; each command runs Claude Code headlessly and manages background jobs.

Layout

.agents/plugins/marketplace.json   # Codex marketplace manifest (marketplace name: claude-code)
plugins/claude/                    # the plugin itself
  .codex-plugin/plugin.json        # plugin manifest (version synced by scripts/bump-version.mjs)
  commands/*.md                    # slash commands; each shells out to the companion script
  agents/claude-rescue.md          # thin forwarder agent for @claude rescue
  skills/                          # claude-cli-runtime, claude-result-handling, claude-prompting
  prompts/*.md                     # {{VARIABLE}} templates interpolated by lib/prompts.mjs
  schemas/review-output.schema.json# structured review findings schema
  scripts/claude-companion.mjs     # single CLI entrypoint; all verbs dispatch from here
  scripts/lib/                     # runtime modules
  scripts/hooks/                   # Codex SessionStart + Stop hook scripts
tests/                             # node:test suites + fake `claude` binary fixture
scripts/bump-version.mjs           # fans package.json version to plugin.json; --check in CI

Development

• Run tests: npm test (node --test, no network, no real claude — everything goes through tests/fake-claude-fixture.mjs)
• Version bump: node scripts/bump-version.mjs <version>; CI runs --check
• Zero runtime dependencies; plain Node ESM (.mjs), Node >= 18.18
• Local install for manual testing: codex plugin marketplace add <repo-dir> then codex plugin add claude@claude-code

Architecture

• scripts/lib/claude.mjs — runClaudeTurn() spawns claude -p --output-format stream-json --verbose, feeds the prompt via stdin, and parses NDJSON events (lib/claude-stream.mjs) into progress phases (starting/investigating/editing/verifying/finalizing) and the final result (resultText, structured_output, session_id, cost).
• Permission model: reviews and plans run with --permission-mode plan (read-only); write tasks use acceptEdits plus a curated --allowedTools list; --full-auto maps to --dangerously-skip-permissions.
• Jobs: every verb runs through runTrackedJob (lib/tracked-jobs.mjs); state lives in <data-root>/state/<slug>-<hash>/ as state.json + per-job <id>.json/.log. Background runs spawn a detached job-worker subprocess. Resume uses the stored claudeSessionId with claude --resume.
• Data root resolution (lib/state.mjs): CLAUDE_COMPANION_DATA env → ~/.codex/claude-companion if writable → tmpdir. The writability probe matters: Codex sandboxes often cannot write under ~/.codex.
• Transfer (lib/codex-rollout.mjs, codex-session-transfer.mjs, claude-session-writer.mjs): parses a Codex rollout, flattens each turn into plain-text user/assistant records (tool calls become inline bullets; thinking/tool blocks cannot be synthesized because they carry signatures), writes ~/.claude/projects/<sanitized-cwd>/<uuid>.jsonl, and smoke-tests claude --resume before publishing.
• Hooks: Codex plugins cannot ship hooks, so @claude setup --enable-review-gate writes entries into ~/.codex/hooks.json via lib/hooks-config.mjs (marker claude-plugin-codex, idempotent merge, never clobbers foreign entries). The Stop hook runs a plan-mode review of the previous Codex turn and blocks with {"decision":"block"} on BLOCK: output; stop_hook_active guards against loops.