During March 2025, Daniele Colombo enhanced the modelcontextprotocol/csharp-sdk repository by implementing CancellationToken support for both client and server request handlers. This work focused on strengthening asynchronous programming patterns in C#, enabling graceful cancellation of in-flight requests and improving error handling within the MCP stack. By propagating CancellationToken through handler registrations, Daniele ensured end-to-end cancellation behavior, which addressed challenges in resource utilization and responsiveness for long-running or latency-prone operations. The update aligned with business goals for predictable performance and improved developer experience, demonstrating a solid grasp of API development and asynchronous workflows within a modern C# codebase.