Worked on the modelcontextprotocol/rust-sdk repository to deliver ergonomic wrapper support for client and server composition in Rust. Implemented blanket trait implementations for ClientHandler and ServerHandler, enabling seamless use with Box and Arc wrapper types. This approach reduced integration friction and improved API ergonomics, making it easier to extend support to additional wrapper types. Refactored macro-based code to eliminate duplication, enhancing maintainability and clarity. Added comprehensive tests to ensure correctness of the new implementations. The work leveraged skills in concurrency, trait implementation, and testing, resulting in a more flexible and maintainable SDK for safer and faster client-server development.