OpenAI hosts a public, read-only MCP server that lets agents search the OpenAI developer docs and pull full page content. It runs remotely over Streamable HTTP with no sign-in required. OpenAI suggests adding it to Codex and pointing to it from AGENTS.md so questions about the OpenAI API, SDKs and Codex are answered from current docs.
Also available as
Connect
- 1Connect it in ChatGPT
Turn on Developer mode in ChatGPT (Settings → Security and login), open Plugins, select + and paste https://developers.openai.com/mcp as the MCP server URL. Add it to a chat from the composer's tools menu.
- 2Or add it to Codex or the API
codex mcp add openai-docs --url https://developers.openai.com/mcp
Configs are generated from the publisher's documented endpoint. Check their docs for plan requirements and scopes. New to this? Read the step-by-step tutorial.
Things to ask
- “How do I stream tool calls with the Responses API? Check the OpenAI docs”
- “Find the docs page on structured outputs and summarize the JSON schema limits”
- “What config.toml options does Codex support for MCP servers?”
- “Look up the current Agents SDK guide for handoffs”