codex — Brain-and-Arms with the Codex CLI

A Claude Code plugin. Claude becomes the brain (planner + reviewer); the OpenAI Codex CLI is the arms (it makes every file edit), reached through the bundled codex-rescue subagent.

What's inside

• skills/codex/SKILL.md — the workflow skill (triggers on "use codex", "codex mode", "/codex", "have codex implement this", etc.).
• agents/codex-rescue.md — the subagent the skill delegates to. It shells out to codex exec and returns a summary + git diff. The skill is useless without this agent, which is why they ship together.

Prerequisites

The recipient's machine must have:

1. The OpenAI Codex CLI installed and authenticated — codex-rescue runs codex exec. Verify with codex --version.
2. A Codex config (~/.codex/config.toml) for model/reasoning. The agent pins service_tier="fast" per-invocation, so a global service_tier = "default" won't block it; model (gpt-5.5) and model_reasoning_effort are inherited from your config.

Without the Codex CLI, the skill loads but every delegation fails.

Install

/plugin marketplace add darkzOGx/codex-plugin
/plugin install codex

Then start a session and say "use codex". For the intended setup, run the main session on Claude Fable 5 (/model claude-fable-5) so Fable plans and reviews.

Manual install (no marketplace)

Copy skills/codex/ into ~/.claude/skills/ and agents/codex-rescue.md into ~/.claude/agents/.