During September 2025, Yulei worked on the jd-opensource/OxyGent repository, focusing on backend reliability and performance rather than new features. He addressed two critical bugs by refactoring parameter handling in core tooling, improving time validation and robustness in schema generation and execution. Using Python, Pydantic, and Elasticsearch, Yulei optimized the breakpoint restart flow by simplifying search queries and reducing fetch size, which enhanced node information retrieval speed and reduced query overhead. His work strengthened the system’s foundation, improved maintainability, and reduced runtime errors, laying the groundwork for future scalability and more reliable data retrieval workflows in production environments.