skill-codex

Name: skill-codex
Author: skills-directory

Verified

A claude code skill to delegate prompts to codex

1,456stars

114forks

Added 12/27/2025

Installation

# Add to your Claude Code skills
git clone https://github.com/skills-directory/skill-codex

Getting Started

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Security ReportVerified

Last scanned: 4/30/2026

{
  "issues": [],
  "status": "PASSED",
  "scannedAt": "2026-04-30T06:27:27.206Z",
  "semgrepRan": false,
  "npmAuditRan": true,
  "pipAuditRan": true
}

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README.md

Frequently Asked Questions

What is skill-codex?

skill-codex is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by skills-directory. A claude code skill to delegate prompts to codex. It has 1,456 GitHub stars.

Is skill-codex safe to use?

Yes. skill-codex passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.

How do I install skill-codex?

Clone the repository with "git clone https://github.com/skills-directory/skill-codex" and add it to your Claude Code skills directory (see the Installation section above).

Are there alternatives to skill-codex?

Yes. SkillsLLM lists many other AI Agents skills you can browse and compare side by side. Open the AI Agents category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh skill-codex against similar tools.

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⚠️ Third-Party Software Notice

This skill is third-party open-source software developed and hosted independently on GitHub. SkillsLLM is an informational directory and does not control or maintain the underlying repository.

Any security checks, ratings, or warnings displayed by SkillsLLM are automated and limited in scope. They do not constitute a security certification or guarantee that the software is safe, error-free, or free from malicious code, vulnerabilities, compromised dependencies, or prompt-injection risks.

Review the source code, permissions, dependencies, and configuration before installing or running any third-party skill. Use is at your own risk. To the maximum extent permitted by applicable law, SkillsLLM is not liable for losses arising from third-party software.

Read the Terms of Service

Note: If you want a more autonomous setup for agentic workflows, check out klaudworks/ralph-meets-rex.

Codex Integration for Claude Code

Purpose

Enable Claude Code to invoke the Codex CLI (codex exec and session resumes) for automated code analysis, refactoring, and editing workflows.

Prerequisites

codex CLI installed and available on PATH.
Codex configured with valid credentials and settings.
Confirm the installation by running codex --version; resolve any errors before using the skill.

Installation

This repository is structured as a Claude Code Plugin with a marketplace. You can install it as a plugin (recommended) or extract it as a standalone skill.

Option 1: Plugin Installation (Recommended)

Install via Claude Code's plugin system for automatic updates:

/plugin marketplace add skills-directory/skill-codex
/plugin install skill-codex@skill-codex

Option 2: Standalone Skill Installation

Extract the skill folder manually:

git clone --depth 1 git@github.com:skills-directory/skill-codex.git /tmp/skills-temp && \
mkdir -p ~/.claude/skills && \
cp -r /tmp/skills-temp/plugins/skill-codex/skills/codex ~/.claude/skills/codex && \
rm -rf /tmp/skills-temp

Usage

Important: Thinking Tokens

By default, this skill suppresses thinking tokens (stderr output) using 2>/dev/null to avoid bloating Claude Code's context window. If you want to see the thinking tokens for debugging or insight into Codex's reasoning process, explicitly ask Claude to show them.

Example Workflow

User prompt:

Use codex to analyze this repository and suggest improvements for my claude code skill.

Claude Code response: Claude will activate the Codex skill and:

Ask which model to use (gpt-6-astra by default; gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna; or a legacy model such as gpt-5.5) unless already specified in your prompt.
Ask which reasoning effort level (low, medium, high, xhigh, max, or ultra, subject to the model's ceiling) unless already specified in your prompt.
Select appropriate sandbox mode (defaults to read-only for analysis)
Run a command like:

codex exec -m gpt-6-astra \
  --config model_reasoning_effort="high" \
  --sandbox read-only \
  --full-auto \
  --skip-git-repo-check \
  "Analyze this Claude Code skill repository comprehensively..." 2>/dev/null

Result: Claude will summarize the Codex analysis output, highlighting key suggestions and asking if you'd like to continue with follow-up actions.

Detailed Instructions

See plugins/skill-codex/skills/codex/SKILL.md for complete operational instructions, CLI options, and workflow guidance.