Andrew worked on the modelcontextprotocol/rust-sdk repository, focusing on backend development and dependency management using Rust. He implemented a feature to decouple the HTTP server framework by removing the unused axum dependency from the server-side-http feature, instead moving axum to dev-dependencies for testing purposes. This approach reduced the library’s transitive dependency surface and optimized build times, allowing downstream users to select their preferred HTTP server or framework without compatibility issues. Andrew ensured that existing examples remained functional by updating the testing strategy, demonstrating a thoughtful balance between flexibility, maintainability, and minimal impact on end users’ workflows.