Codex Plugin for Claude Code

Published by OpenAI (github.com/openai)

What it does

Working inside one model’s context tends to bake in that model’s blind spots. Getting a second pass from a different vendor — for review or for handing off the hard parts — usually means context-switching out of your editor.

This plugin pulls that flow back into Claude Code: from the same session, you can fire a slash command to request a Codex review, an adversarial review, or a full task handoff to Codex.

Key features

• Seven slash commands

  /codex:review for a standard review and /codex:adversarial-review for a skeptical, challenging take on design decisions. /codex:rescue hands off work; /codex:status, /codex:result, and /codex:cancel manage background jobs. /codex:setup verifies your install and settings.

• codex:codex-rescue subagent

  Beyond one-shot commands, work can be delegated as a subagent — a separate Claude run with its own model and effort, with results returned to the main session.

• Background jobs with progress tracking

  /codex:rescue runs in the background so the main session isn’t blocked. Job state and output flow through the status/result/cancel triplet.

• Optional review gate via Stop hooks

  Hook into Claude Code’s Stop hook to slot an automatic review in just before tasks finish — useful when you want a pre-PR check that always runs.

• Branch-based reviews — --base

  Pass --base to scope the review to changes against a specific branch. Pairs naturally with PR-style review flows.

• Delegates through the local Codex CLI

  No separate runtime — the plugin delegates through the local Codex CLI and Codex app server, reusing existing local auth, config, environment, and MCP setup.

Installation

/plugin marketplace add openai/codex-plugin-cc
/plugin install codex@openai-codex
/reload-plugins
/codex:setup

/codex:setup checks Codex CLI auth and settings. Run it once after install to confirm the connection before relying on the commands.

Prerequisites

• Node.js 18.18 or later
• Codex CLI installed locally
• A ChatGPT subscription (Free tier included) or an OpenAI API key — auth is reused from the Codex CLI

Notes

• OpenAI-published, not Anthropic-published — the plugin lives in github.com/openai and ships through its own marketplace (openai/codex-plugin-cc). It’s not listed in claude.com/plugins.
• Apache-2.0 — free for commercial and personal use.
• Two-vendor cost shape — running both Claude Code (Anthropic) and Codex (OpenAI) splits tokens and billing across providers. Track usage on each platform separately if cost monitoring matters.
• Auth and config reused from local Codex CLI — no extra API key entry; whatever your local Codex CLI has (auth, config, MCP servers) is what the plugin uses.
• Active development — daily-ish updates since the March 30, 2026 launch, so the command set may grow.