Worked on the microsoft/autogen repository to enhance the reliability of its asynchronous messaging pipeline. Focused on stabilizing message processing by addressing a critical bug in the send_message function, which previously caused infinite loops when an unknown recipient was encountered. Applied expertise in Python, async programming, and event loop management to implement early termination logic, ensuring the system exited gracefully and maintained consistent state. Prioritized error handling to prevent production runtime hangs and reduce operational risk. No new features were introduced during this period, as efforts centered on improving correctness and traceability within the existing asynchronous workflow for robust message delivery.