Lets you connect an existing ChatGPT Plus, Pro, or Team subscription to access gpt-5-codex and related models without needing an API key. It's an OAuth device-code flow: you get a verification URL and code, the user logs into their OpenAI account in a browser, then you poll to finalize. The big gotcha is that the frontend won't show the new models until the user manually refreshes the page, so you have to tell them that explicitly or they'll think it failed. Only use this when someone explicitly says they want to sign in with their ChatGPT subscription. If they mention an API key instead, that's a different setup path entirely.
npx skills add https://github.com/starchild-ai-agent/official-skills --skill chatgpt-codex-onboarding