aws

fastmcp.server.auth.providers.aws

AWS Cognito OAuth provider for FastMCP.

This module provides a complete AWS Cognito OAuth integration that’s ready to use with a user pool ID, domain prefix, client ID and client secret. It handles all the complexity of AWS Cognito’s OAuth flow, token validation, and user management.

Example:

from fastmcp import FastMCP
from fastmcp.server.auth.providers.aws_cognito import AWSCognitoProvider

# Simple AWS Cognito OAuth protection
auth = AWSCognitoProvider(
    user_pool_id="your-user-pool-id",
    aws_region="eu-central-1",
    client_id="your-cognito-client-id",
    client_secret="your-cognito-client-secret"
)

mcp = FastMCP("My Protected Server", auth=auth)

Classes

AWSCognitoTokenVerifier

Token verifier that filters claims to Cognito-specific subset.

Methods:

verify_token

verify_token(self, token: str) -> AccessToken | None

Verify token and filter claims to Cognito-specific subset.

AWSCognitoProvider

Complete AWS Cognito OAuth provider for FastMCP.

This provider makes it trivial to add AWS Cognito OAuth protection to any FastMCP server using OIDC Discovery. Just provide your Cognito User Pool details, client credentials, and a base URL, and you’re ready to go.

Features:

• Automatic OIDC Discovery from AWS Cognito User Pool
• Automatic JWT token validation via Cognito’s public keys
• Cognito-specific claim filtering (sub, username, cognito:groups)
• Support for Cognito User Pools

Methods:

get_token_verifier

get_token_verifier(self) -> TokenVerifier

Creates a Cognito-specific token verifier with claim filtering.

Args:

• algorithm: Optional token verifier algorithm
• audience: Optional token verifier audience
• required_scopes: Optional token verifier required_scopes
• timeout_seconds: HTTP request timeout in seconds