Codex：ターミナルで働く AI コーディングパートナー

01 / Intro

Codex とは

Codex is OpenAI's coding agent. It can run locally through Codex CLI, work in an IDE, or run as Codex Web in ChatGPT. Use it for reading code, planning changes, fixing bugs, writing tests, and preparing PR notes.

02 / Setup

インストール

curl -fsSL https://chatgpt.com/codex/install.sh | sh

npm install -g @openai/codex

brew install --cask codex

Run codex, then choose Sign in with ChatGPT. API-key auth is also available for advanced users.

03 / Workflow

808 推奨ワークフロー

1. Ask Codex to read first, without editing.
2. Ask for a plan listing files, risks, and verification steps.
3. Let it make one small change at a time.
4. Run tests, lint, and build before calling the task done.
5. Ask for a delivery summary with changes, checks, and remaining risks.

04 / Guardrails

安全と権限