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fastmcp.server.auth.providers.descope

Descope authentication provider for FastMCP. This module provides DescopeProvider - a complete authentication solution that integrates with Descope’s OAuth 2.1 and OpenID Connect services, supporting Dynamic Client Registration (DCR) for seamless MCP client authentication.

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Classes

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DescopeProviderSettings

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DescopeProvider

Descope metadata provider for DCR (Dynamic Client Registration). This provider implements Descope integration using metadata forwarding. This is the recommended approach for Descope DCR as it allows Descope to handle the OAuth flow directly while FastMCP acts as a resource server. IMPORTANT SETUP REQUIREMENTS:
  1. Enable Dynamic Client Registration in Descope Console:
    • Go to the Inbound Apps page of the Descope Console
    • Click DCR Settings
    • Enable Dynamic Client Registration (DCR)
    • Define allowed scopes
  2. Note your Project ID:
For detailed setup instructions, see: https://docs.descope.com/identity-federation/inbound-apps/creating-inbound-apps#method-2-dynamic-client-registration-dcr Methods:

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get_routes 

get_routes(self, mcp_path: str | None = None, mcp_endpoint: Any | None = None) -> list[Route]
Get OAuth routes including Descope authorization server metadata forwarding. This returns the standard protected resource routes plus an authorization server metadata endpoint that forwards Descope’s OAuth metadata to clients. Args:
  • mcp_path: The path where the MCP endpoint is mounted (e.g., “/mcp”)
  • mcp_endpoint: The MCP endpoint handler to protect with auth