Adam Kowalski focused on backend development for the modelcontextprotocol/rust-sdk repository, where he stabilized the Streamable HTTP Client by addressing stale-session error handling. Using Rust, Adam mapped 401 errors to status-aware responses, ensuring that client integrations receive accurate feedback when sessions expire or become invalid. He expanded test coverage by adding scenarios that verify a stale session ID returns a 404 status when not found, capturing edge cases in the session lifecycle. This work improved the reliability and debuggability of the client, demonstrating a methodical approach to error signaling and robust testing practices within a Rust-based backend environment.