During December 2025, this developer delivered an OAuth 2.0 Protected Resource Metadata Endpoint for the modelcontextprotocol/go-sdk repository, focusing on backend development and API design using Go. The implementation included built-in CORS support, enabling public metadata discovery with Access-Control-Allow-Origin set to allow broad interoperability. By adhering to RFC 9728 §3.1, the endpoint facilitates secure and standards-compliant resource discovery for clients. The work also encompassed comprehensive documentation and practical examples for customizing CORS policies, supporting both rs/cors and jub0bs/cors libraries. No bugs were addressed during this period, as efforts centered on expanding integration capabilities and improving developer onboarding.