pluginbeginnerChatGPT/Codex

Codex CLI: Local AI Coding Agent for your Terminal

OpenAI has released Codex CLI, a tool that lets developers use AI coding assistance directly in their computer's terminal. It integrates with existing ChatGPT subscriptions to help write, debug, and manage code without needing to switch to a web browser.

AI SETUP PROMPT

Paste into Codex CLI — it will scan your project and set everything up

# Install & Configure: Codex CLI: Local AI Coding Agent for your Terminal

## What This Is
OpenAI has released Codex CLI, a tool that lets developers use AI coding assistance directly in their computer's terminal. It integrates with existing ChatGPT subscriptions to help write, debug, and manage code without needing to switch to a web browser.

Source: https://github.com/openai/codex/releases

## Before You Start

Scan my workspace and analyze:
- The project language, framework, and directory structure
- Existing agent configuration (check for .claude/, .codex/, CLAUDE.md, settings.json, commands/, skills/ directories)
- Whether this repository or a similar tool is already cloned or installed

Then ask me before proceeding:
1. Do I need to configure any service credentials for this plugin (database, API keys, etc.)?
2. Should this be project-scoped or global?

## What to Implement

This is an **Agent Plugin** — typically an MCP server or capability bundle.

- Install any required npm/pip packages from the source repository
- Register the MCP server in `.claude/settings.json` under the `mcpServers` key with the correct command and args
- Configure any required environment variables or credentials
- Verify the server starts correctly by checking its expected output

## Additional Context

- Detect the user's operating system and preferred package manager (npm or Homebrew). Use `npm install -g @openai/codex` or `brew install --cask codex` to install the Codex CLI globally.
- Initiate the Codex CLI by running the `codex` command. The CLI will automatically open a browser window for the user to authenticate with their OpenAI account. Inform the user that this one-time authentication is required to link their ChatGPT plan.
- Verify the installation and authentication by executing `codex --version` to check the version, then run `codex "Write a Python script that prints 'hello world'"` to confirm the agent is connected and responding.

## Reference Implementation

```
```shell
# Install using npm
npm install -g @openai/codex

# Install using Homebrew
brew install --cask codex
```
```

## Guidelines

- Adapt everything to my existing project — do not assume a specific stack or directory layout
- Review any fetched code for safety before installing or executing it
- After setup, run a quick verification and show me a summary of exactly what was installed, where, and how to use it

2,413 charactersCompatible with Claude Code & Codex CLI

MANUAL SETUP STEPS

01Detect the user's operating system and preferred package manager (npm or Homebrew). Use `npm install -g @openai/codex` or `brew install --cask codex` to install the Codex CLI globally.
02Initiate the Codex CLI by running the `codex` command. The CLI will automatically open a browser window for the user to authenticate with their OpenAI account. Inform the user that this one-time authentication is required to link their ChatGPT plan.
03Verify the installation and authentication by executing `codex --version` to check the version, then run `codex "Write a Python script that prints 'hello world'"` to confirm the agent is connected and responding.

CODE INTELLIGENCE

bash

```shell
# Install using npm
npm install -g @openai/codex

# Install using Homebrew
brew install --cask codex
```

FIELD OPERATIONS

Automated Git Commit Message Generator

Use the Codex CLI in a `prepare-commit-msg` git hook. The script would pipe `git diff --staged` output to `codex` with a prompt to 'Generate a concise commit message in the Conventional Commits format based on these code changes'.

CLI-based Documentation Scraper

Build a shell script that accepts a URL and uses `curl` to fetch the page content. Pipe the raw HTML to `codex` with a prompt like 'Extract the main points from this documentation and format them as a Markdown summary', creating a rapid reference generator for any library.

STRATEGIC APPLICATIONS

→Accelerating DevOps Scripting: A DevOps engineer uses the Codex CLI to quickly generate shell scripts for infrastructure automation, such as 'Write a bash script to find and remove all Docker containers older than 30 days', reducing time spent on repetitive scripting.
→Onboarding Junior Developers: A junior developer new to a complex codebase uses `codex 'Explain this function and its side effects'` on unfamiliar code directly in their terminal for instant, contextual learning without interrupting senior developers.