During October 2025, the developer delivered CORS middleware and configuration for the modelcontextprotocol/registry API, enabling browser-based clients and web applications to access the registry securely. They implemented the CORSMiddleware in Go, integrating it into the server’s middleware stack and introducing configurable options for CORS enablement and allowed origins. Their approach ensured proper handling of preflight OPTIONS requests, returning 204 responses and injecting the necessary headers across all responses. All existing tests passed, and manual verification confirmed correct behavior. This work addressed a cross-origin issue, supporting frontend integration and demonstrating skills in API development, middleware integration, and thorough testing practices.