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fastmcp.server.auth.auth

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Classes

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AccessToken

AccessToken that includes all JWT claims.

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AuthProvider

Base class for all FastMCP authentication providers. This class provides a unified interface for all authentication providers, whether they are simple token verifiers or full OAuth authorization servers. All providers must be able to verify tokens and can optionally provide custom authentication routes. Methods:

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verify_token 

verify_token(self, token: str) -> AccessToken | None
Verify a bearer token and return access info if valid. All auth providers must implement token verification. Args:
  • token: The token string to validate
Returns:
  • AccessToken object if valid, None if invalid or expired

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get_routes 

get_routes(self, mcp_path: str | None = None, mcp_endpoint: Any | None = None) -> list[Route]
Get the routes for this authentication provider. Each provider is responsible for creating whatever routes it needs:
  • TokenVerifier: typically no routes (default implementation)
  • RemoteAuthProvider: protected resource metadata routes
  • OAuthProvider: full OAuth authorization server routes
  • Custom providers: whatever routes they need
Args:
  • mcp_path: The path where the MCP endpoint is mounted (e.g., “/mcp”)
  • mcp_endpoint: The MCP endpoint handler to protect with auth
Returns:
  • List of routes for this provider, including protected MCP endpoints if provided

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get_middleware 

get_middleware(self) -> list
Get HTTP application-level middleware for this auth provider. Returns:
  • List of Starlette Middleware instances to apply to the HTTP app

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TokenVerifier

Base class for token verifiers (Resource Servers). This class provides token verification capability without OAuth server functionality. Token verifiers typically don’t provide authentication routes by default. Methods:

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verify_token 

verify_token(self, token: str) -> AccessToken | None
Verify a bearer token and return access info if valid.

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RemoteAuthProvider

Authentication provider for resource servers that verify tokens from known authorization servers. This provider composes a TokenVerifier with authorization server metadata to create standardized OAuth 2.0 Protected Resource endpoints (RFC 9728). Perfect for:
  • JWT verification with known issuers
  • Remote token introspection services
  • Any resource server that knows where its tokens come from
Use this when you have token verification logic and want to advertise the authorization servers that issue valid tokens. Methods:

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verify_token 

verify_token(self, token: str) -> AccessToken | None
Verify token using the configured token verifier.

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get_routes 

get_routes(self, mcp_path: str | None = None, mcp_endpoint: Any | None = None) -> list[Route]
Get OAuth routes for this provider. Creates protected resource metadata routes and optionally wraps MCP endpoints with auth.

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OAuthProvider

OAuth Authorization Server provider. This class provides full OAuth server functionality including client registration, authorization flows, token issuance, and token verification. Methods:

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verify_token 

verify_token(self, token: str) -> AccessToken | None
Verify a bearer token and return access info if valid. This method implements the TokenVerifier protocol by delegating to our existing load_access_token method. Args:
  • token: The token string to validate
Returns:
  • AccessToken object if valid, None if invalid or expired

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get_routes 

get_routes(self, mcp_path: str | None = None, mcp_endpoint: Any | None = None) -> list[Route]
Get OAuth authorization server routes and optional protected resource routes. This method creates the full set of OAuth routes including:
  • Standard OAuth authorization server routes (/.well-known/oauth-authorization-server, /authorize, /token, etc.)
  • Optional protected resource routes
  • Protected MCP endpoints if provided
Returns:
  • List of OAuth routes