OpenAI Codex CLI Lightweight coding agent that runs in your terminal npm i -g @openai/codex Table of Contents Quickstart Why Codex? Security Model & Permissions Platform sandboxing details System Requirements CLI Reference Memory & Project Docs Non‑interactive / CI mode Recipes Installation Configuration FAQ Contributing Development workflow Writing high‑impact code changes Opening a pull request Review process Community values Getting help Developer Certificate of Origin (DCO) How to sign (reco...