During the month, work focused on enhancing authentication reliability in the modelcontextprotocol/csharp-sdk repository by implementing persistent OAuth access token caching. This feature was developed in C# and centered on allowing access tokens to persist beyond the HTTP transport lifetime, addressing common issues with token expiration during long-running client sessions. By introducing this caching mechanism, the update reduced token-related failures and minimized friction in token refresh processes. The approach leveraged skills in authentication, OAuth, and unit testing to ensure robust integration for client applications, ultimately increasing the resilience and reliability of authentication flows within the SDK’s C# codebase.