Casey Chow enhanced the reliability of the RmcpClient in the openai/codex repository by developing a one-time session recovery mechanism for streamable HTTP 404 errors. Using Rust and focusing on backend API development, Casey implemented logic that allows the client to automatically retry operations after reinitializing its internal state, addressing previously unrecoverable streaming failures. The work included expanding test coverage to simulate both 404 and 401 error scenarios, which strengthened error handling and recovery workflows. This approach improved the robustness of streaming operations, reduced downstream failures, and contributed to a more resilient and maintainable networked client architecture.