Worked on the pydantic/pydantic-ai repository to enhance configuration reliability and test coverage for timeout handling in backend systems. Developed a unified read_timeout configuration by renaming and consolidating the previous sse_read_timeout parameter across multiple server classes, ensuring consistent initialization and propagation to client sessions. Introduced strict validation logic in Python to prevent ambiguous configurations, raising errors when conflicting parameters are provided. Maintained backward compatibility by supporting the deprecated parameter during migration, and implemented comprehensive tests to verify correct behavior and transition safety. This work focused on API development, backend refactoring, and robust testing to reduce misconfiguration risks and improve maintainability.