Codex Plugin for Claude Code

Skill by ara.so — Daily 2026 Skills collection.

A Claude Code plugin that lets you run OpenAI Codex code reviews and delegate background tasks to Codex directly from your Claude Code session. Use it for read-only code reviews, adversarial design challenges, and handing off investigative or fix tasks to Codex as a subagent.

What It Does

/codex:review — Standard read-only Codex code review of uncommitted changes or a branch diff
/codex:adversarial-review — Steerable review that challenges design decisions, tradeoffs, and assumptions
/codex:rescue — Delegate a task (bug investigation, fix, etc.) to Codex as a background subagent
/codex:status — Check progress of background Codex jobs
/codex:result — Retrieve output from a finished job (includes Codex session ID for codex resume)
/codex:cancel — Cancel an active background job
/codex:setup — Verify Codex is installed and authenticated; optionally enable/disable the review gate

Requirements

Node.js 18.18 or later
A ChatGPT subscription (Free tier works) or an OpenAI API key
Claude Code with plugin support

Installation

1. Add the marketplace and install the plugin

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

2. Verify setup

/codex:setup

If Codex CLI is missing, /codex:setup can install it for you via npm, or install manually:

npm install -g @openai/codex

3. Authenticate with Codex

!codex login

Supports ChatGPT account login or API key. Your existing Codex CLI authentication is reused automatically if already logged in.

Key Commands

`/codex:review`

Runs a standard read-only Codex review on your current work.

# Review uncommitted changes
/codex:review

# Review diff against a base branch
/codex:review --base main

# Run in the background (recommended for multi-file changes)
/codex:review --background

# Run and wait inline
/codex:review --wait

`/codex:adversarial-review`

Challenges implementation decisions, tradeoffs, and hidden assumptions. Accepts optional free-text focus after flags.

# Basic adversarial review
/codex:adversarial-review

# Target a branch diff with a specific focus
/codex:adversarial-review --base main challenge whether this caching approach was correct

# Run in background, focus on race conditions
/codex:adversarial-review --background look for race conditions and question the retry design

`/codex:rescue`

Hands off a task to Codex via the codex:codex-rescue subagent.

# Investigate a failing test
/codex:rescue investigate why the tests started failing

# Apply a minimal fix
/codex:rescue fix the failing test with the smallest safe patch

# Resume the most recent Codex session for this repo
/codex:rescue --resume apply the top fix from the last run

# Start fresh (ignore previous session)
/codex:rescue --fresh investigate the regression

# Use a specific model and effort level
/codex:rescue --model gpt-5.4-mini --effort medium investigate the flaky integration test

# Use the faster "spark" model (maps to gpt-5.3-codex-spark)
/codex:rescue --model spark fix the issue quickly

# Run in the background
/codex:rescue --background investigate why the build is failing in CI

You can also trigger rescue via natural language to Claude:

Ask Codex to redesign the database connection to be more resilient.

`/codex:status`

# List all running and recent jobs for this repo
/codex:status

# Check a specific job
/codex:status task-abc123

`/codex:result`

# Get result of the most recent finished job
/codex:result

# Get result for a specific job
/codex:result task-abc123

Output includes a Codex session ID. Resume that session directly in Codex:

codex resume <session-id>

`/codex:cancel`

# Cancel the most recent active job
/codex:cancel

# Cancel a specific job
/codex:cancel task-abc123

`/codex:setup` — Review Gate

# Enable the stop hook review gate
/codex:setup --enable-review-gate

# Disable it
/codex:setup --disable-review-gate

Warning: The review gate runs a Codex review on every Claude response and blocks the stop if issues are found. This can trigger long Claude/Codex loops and drain usage limits. Only enable it when actively monitoring the session.

Configuration

The plugin uses the same config.toml as the Codex CLI. Configuration is layered:

Location	Scope
`~/.codex/config.toml`	User-level defaults
`.codex/config.toml` (project root)	Project-level overrides (requires trusted project)

Example: Set default model and effort for a project

# .codex/config.toml
model = "gpt-5.4-mini"
model_reasoning_effort = "xhigh"

Example: Point to a custom OpenAI-compatible endpoint

# ~/.codex/config.toml
openai_base_url = "https://your-custom-endpoint.example.com/v1"

API keys and authentication are managed via codex login — do not hardcode keys in config files. The CLI reads from the authenticated session or from the OPENAI_API_KEY environment variable.

Common Patterns

Review before shipping

/codex:review --base main

Start a long-running review, check back later

/codex:adversarial-review --background look for auth and data-loss risks
/codex:status
/codex:result

Delegate a bug investigation and resume in Codex

/codex:rescue --background investigate why the integration test is flaky
# ... later ...
/codex:result
# Copy session ID from output, then:
codex resume <session-id>

Iterative rescue workflow

# First pass
/codex:rescue investigate the failing build

# Apply what Codex found, continuing the same thread
/codex:rescue --resume apply the recommended fix from the last run

# Start completely fresh
/codex:rescue --fresh re-investigate with a clean slate

Use Claude to delegate naturally

Ask Codex to refactor the authentication module to remove the global state.

Claude will invoke the codex:codex-rescue subagent automatically.

Troubleshooting

`/codex:setup` says Codex is not installed

npm install -g @openai/codex
# or let /codex:setup install it for you

Codex is installed but not authenticated

!codex login

Supports ChatGPT account or API key. If using an API key directly:

export OPENAI_API_KEY=your-key-here

Background job seems stuck

/codex:status
/codex:cancel task-abc123

Plugin commands not appearing after install

/reload-plugins

Project-level config not being picked up

Project config in .codex/config.toml only loads when the project is trusted by Codex. Run codex directly in the project directory to trust it, or check the Codex advanced config docs.

Review gate creating runaway loops

Disable it immediately:

/codex:setup --disable-review-gate

How It Works Internally

The plugin wraps the local codex binary and the Codex app server
All jobs run in your local environment against your local repository checkout
Authentication, config, and model settings come from your existing Codex CLI setup
Background jobs are tracked per-repository and can be resumed in Codex directly via session IDs
The codex:codex-rescue subagent is registered in /agents and can be invoked by Claude automatically when you ask it to delegate work to Codex

codex-plugin-cc