8000 Support for .well-known oauth discovery endpoints by seriousben · Pull Request #132 · punkpeye/fastmcp · GitHub
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Support for .well-known oauth discovery endpoints #132

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Support for .well-known oauth discovery endpoints #132

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seriousben
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@seriousben seriousben commented Jun 25, 2025 •
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Summary

This allows protecting a fastmcp server behind an oauth server.

This is done by adding support for OAuth 2.1 w A591 ell-known discovery endpoints to FastMCP, enabling MCP servers to serve OAuth metadata for authorization flows as required by MCP Specifications 2025-03-26 and 2025-06-18.

Note that additional features could be built on top of this like token verification, scope checks, and so on. This PR adds the minimum to allow mcp developers to add support for oauth auth.

Configuration

const server = new FastMCP({
  name: "My Server",
  version: "1.0.0",
  oauth: {
    enabled: true,
    authorizationServer: {
      issuer: "https://auth.example.com",
      authorizationEndpoint: "https://auth.example.com/oauth/authorize",
      tokenEndpoint: "https://auth.example.com/oauth/token",
      responseTypesSupported: ["code"],
    },
    protectedResource: {
      resource: "mcp://my-server",
      authorizationServers: ["https://auth.example.com"],
      bearerMethodsSupported: ["header"]
    }
  }
});

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@seriousben @punkpeye
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