codex-subagent

اجرای Codex CLI به‌عنوان زیرعامل ایزوله برای کارهای محدود

این اسکیل Codex CLI را به‌عنوان زیرعامل جداگانه برای کارهای محدود برنامه‌نویسی، بازبینی یا راستی‌آزمایی اجرا می‌کند.

پیش‌بررسی، اجرا، جمع‌آوری نتایج، اجرای موازی و حالت‌های شکست همه پوشش داده شده‌اند.

چه چیزی می‌گیرید

  • پیش‌بررسی و اجرای زیرعامل
  • جمع‌آوری نتیجه
  • اجرای موازی و مدیریت خطا

برای چه کاری خوب است

  • تقسیم کار بزرگ به بخش‌های مستقل
  • راستی‌آزمایی مستقل تغییرات

برای چه کاری نیست

  • کارهایی که به کل زمینهٔ پروژه نیاز دارند

دربارهٔ این اسکیل

Codex CLI as a Subagent

When to Use

  • Use when a bounded coding, review, or verification task can run in a separate Codex CLI session.
  • Use when parallel work needs explicit file ownership and a clear definition of done.

Codex CLI is OpenAI's terminal coding agent. codex exec runs it non-interactively:
it works autonomously in a sandbox, streams progress to stderr, and prints only the
final message to stdout. Confirm the user's intended authentication mode and account; this workflow assumes ChatGPT login and must not silently switch to billable API-key authentication.

When to delegate

  • Self-contained coding task with clear success criteria (fix, feature, refactor, review).
  • Parallel work: several independent tasks at once (see Parallel runs).
  • Second opinion / independent verification of your own changes.

Do NOT delegate tasks that need conversation context you can't fully write into the prompt.

Preflight

codex --version       # missing? npm i -g @openai/codex  (or: brew install --cask codex)
codex login status    # exit 0 + "Logged in using ChatGPT" = ready

Not logged in → stop and tell the user to run codex login (one-time browser OAuth).
Never read, print, or copy credentials (~/.codex/auth.json).

Launch

OUT=$(mktemp /tmp/codex-out.XXXXXX)
codex exec \
  --cd /path/to/repo \
  --sandbox workspace-write \
  --output-last-message "$OUT" \
  "Full task prompt: goal, constraints, files to touch, definition of done." \
  </dev/null
  • </dev/null is MANDATORY when stdin is not a real terminal (background shells, scripts): codex treats open stdin as extra context and waits forever for EOF.
  • Codex sees NOTHING of your conversation. Put all context in the prompt: goal, relevant paths, constraints, and how to verify it's done.
  • Long prompt? Pipe it via stdin instead: codex exec [flags] - < /tmp/task.md.
  • Wrap the command in a background/Bash subagent if your host agent has one (Cursor: Task tool with a shell subagent) so Codex's verbose stream stays out of the parent context. Fallback: a plain background terminal.
  • Runs take minutes and have no built-in timeout — background it and monitor.
  • Optional: -m <model> to override the model, --json for JSONL event stream.

Collect results

cat "$OUT"                            # final message = the deliverable
git -C /path/to/repo status --short   # see what Codex actually changed

Follow-up in the same session (run from the same cwd — resume filters by cwd):

codex exec resume --last "follow-up instruction" </dev/null

Parallel runs

Parallelize only genuinely independent tasks, and assign file ownership upfront so
results merge cleanly. One git worktree per Codex run — never two in the same tree:

git worktree add /tmp/wt-taskA -b codex/task-a
codex exec --cd /tmp/wt-taskA --sandbox workspace-write -o /tmp/outA.md "task A" </dev/null

Failure modes

  • Hangs forever with no output → stdin was left open. Kill it, relaunch with </dev/null.
  • codex login status non-zero → the user must run codex login. Don't work around it.
  • ChatGPT plan rate limit hit → report to the user; never retry in a loop.
  • "Not a git repo" error → add --skip-git-repo-check, or init a repo first.
  • Network is blocked inside the workspace-write sandbox by default. If the task needs it (installs, API calls): -c sandbox_workspace_write.network_access=true.
  • NEVER use --dangerously-bypass-approvals-and-sandbox.

Rules

  • Delegate only when the user or applicable project instructions authorize it. Installing this skill alone does not authorize new agents, external disclosure, or extra spending.
  • One task per launch. Split big jobs into multiple launches.
  • Review Codex's diff yourself before declaring the task done.

Cursor-native wrapper (optional)

For auto-routing and /codex invocation inside Cursor, add ~/.cursor/agents/codex.md —
a custom subagent whose description is "delegates coding tasks to Codex CLI" and whose
body points at this skill.

Limitations

  • Adapted from davidondrej/skills; verify local paths, tools, credentials, and agent features before acting.
  • For commands, remote access, scheduling, browser automation, or file-changing workflows, get explicit user approval and confirm the target environment first.

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