cf-mcp-server-clerk

The server implements robust OAuth 2.1 authorization with strong security controls, including one-time use CSRF tokens (`__Host-CSRF_TOKEN`), state binding to user sessions (`__Host-CONSENTED_STATE`), and cryptographic cookie signing for approved clients (`__Host-APPROVED_CLIENTS`). All secrets (Clerk API keys, cookie encryption key) are loaded from environment variables/Wrangler secrets, preventing hardcoding. Input URLs and text are sanitized to mitigate XSS risks. The architecture separates OAuth concerns from MCP tool logic, and it correctly uses Cloudflare's platform features like KV storage for ephemeral state and Durable Objects for persistent MCP state. The README explicitly warns that it is a demo and requires further production hardening (e.g., rate limiting, advanced monitoring) which is sound advice for any production system.