During June 2025, Yubee Lee focused on enhancing the reliability of agent executors in the a2aproject/a2a-samples repository. They addressed asynchronous task handling by updating implementations to use Python’s await syntax, ensuring compatibility with a2a-sdk version 0.2.6. This work involved correcting async processing across multiple agent types, which improved task state propagation and artifact management. Leveraging skills in agent development, async programming, and SDK integration, Yubee resolved a bug that previously caused incorrect task updates. The changes contributed to more stable agent executions and reduced the risk of production issues related to asynchronous operations, reflecting careful, targeted engineering.