# codex-subagent

> Claude/Codex skill by [@davidondrej](https://omgskills.com/library/davidondrej/index.md) · 4.2k stars · Updated 2026-10-28

Launch OpenAI Codex CLI as a subagent (ChatGPT subscription auth, no API key). Use when delegating a self-contained coding task to Codex from another agent — parallel implementation work, a second opinion, or an independent verification pass.

## Install

```sh
git clone https://github.com/davidondrej/skills /tmp/skills && ln -s /tmp/skills/skills/agent-orchestration/codex-subagent ~/.claude/skills/codex-subagent
```

## From README

Codex CLI as a Subagent 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. Auth reuses the user's ChatGPT subscription — never an API key. 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 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 Always use GPT 5.6 Sol (gpt-5.6-sol). Default reasoning effort to high. Pass both flags explicitly on every new Codex run. Do NOT use Codex fast mode.

## Links

- HTML page: https://omgskills.com/library/davidondrej/skills/codex-subagent/
- GitHub: https://github.com/davidondrej/skills
- Author: [@davidondrej](https://omgskills.com/library/davidondrej/index.md)

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