Fern Docs MCP lets AI agents search and retrieve Fern’s documentation, including API documentation, SDK generation, configuration, and Fern platform guides, to get implementation guidance while working with Fern.
Codex is OpenAI's coding agent for the terminal. It reads MCP servers from its config and signs in to remote ones with OAuth.
This guide connects Fern Docs MCP to Codex through MewCP, so Codex can use Fern Docs MCP's 2 tools, like searchDocs and fetchPage.
Fern Docs MCP needs no credentials, but every call still runs through MewCP: scoped, checked and logged like any other.
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Other clients
Fern Docs MCP works the same way in every client below. Pick yours for its own guide.
Free to start.
Scope access to the exact Fern Docs MCP tools and accounts you allow, work and personal side by side. Anything outside that scope is refused at call time, even when the model asks for it.
Each call is logged: what ran, on which account, and whether it worked. Failures come back structured, so the agent knows whether to retry instead of guessing.
Every app sits behind one secure MCP URL, and there is no server for you to deploy or keep running. Add an integration in the dashboard and it is live on the next call, with no config to change and no new credentials to wire up. Tools load only when a task needs them, so your agent stays fast and focused however many apps you connect.
Run this and approve access in the browser window.
Start a new chat and ask: "List the tools you can use from MewCP." You should see your connected apps.
Search the documentation at https://buildwithfern.com/learn. Returns ranked results with title, url, section anchor and a snippet, in rank order. Use fetchPage to read a result in full.
Read one page of the documentation at https://buildwithfern.com/learn as markdown. Takes a path or url from a searchDocs result.
