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codex-subagent

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Run OpenAI Codex CLI as an external subagent from Claude Code, either once or as a parallel fanout, through hardened codex-sub and codex-fanout wrappers. Use for independent review, cross-model judging, structured second opinions, image analysis, or isolated passes over files and subsystems, especially when the user says "ask Codex", "ask GPT", "cross-check this", or requests parallel independent workers. Load before invoking the codex binary directly so prompts, timeouts, schemas, images, and run artifacts follow the safe wrapper contract.

skills/codex-subagent/SKILL.md

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Sep 1, 2026
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# Codex as a subagent

A second model, callable from Bash, structured-output-capable, and safely parallel. Requires an
authenticated `codex` CLI and `jq`; run `codex-doctor` before the first fanout.

## Defaults — do not restate them on the command line

| | default | why |
|---|---|---|
| model | `gpt-5.6-sol` | Override with `CODEX_SUB_MODEL` when your account uses another available model. |
| effort | **`medium`** | A practical balance for reviews and fanouts; raise deliberately for hard reasoning. |
| sandbox | **`read-only`** | Public-safe default. Pass `-s workspace-write` or `-s danger-full-access` only when the user authorized writes and the task requires them. |
| timeout | 900s | |