# Codex Skill (agent skill)

> Codex Skill is an agent skill (a SKILL.md file) from feiskyer/claude-code-settings. Leverage OpenAI Codex/GPT models for autonomous code implementation, code review, and plan review. It works with Claude Code, Codex and GitHub Copilot and has 1,658 GitHub stars across a repository of 2 listed skills.

Leverage OpenAI Codex/GPT models for autonomous code implementation, code review, and plan review. Triggers: "codex", "use gpt", "gpt-5", "let openai", "full-auto", "adversarial review", "second opinion review", "用codex", "让gpt实现", "对抗式审查", "让codex审查计划", "第二意见". Use this skill whenever the user wants to delegate coding tasks to OpenAI models, run code or plan reviews via codex, get a second-opinion review from a different model, or execute tasks in a sandboxed environment.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/feiskyer/claude-code-settings |
| Skill path | skills/codex-skill/SKILL.md |
| Skill name | codex-skill |
| GitHub stars | 1,658 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 2 |
| Plugin marketplace | claude-code-settings |
| Official | no |
| Works with | Claude Code, Codex, GitHub Copilot |
| Category | Coding |
| Last commit | Sep 27, 2026 |

## When it triggers

- "codex"
- "use gpt"
- "gpt-5"
- "let openai"
- "full-auto"
- "adversarial review"
- "second opinion review"
- "用codex"

## Add this skill

### Claude Code

```sh
/plugin marketplace add feiskyer/claude-code-settings
/plugin   # browse claude-code-settings and install the plugin that contains codex-skill
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/feiskyer/claude-code-settings.git
cp -r claude-code-settings/skills/codex-skill .agents/skills/codex-skill   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/feiskyer/claude-code-settings.git
cp -r claude-code-settings/skills/codex-skill .cursor/skills/codex-skill   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

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Canonical page: https://appsgit.com/skills/feiskyer-codex-skill
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