Linh worked on the microsoft/agent-lightning repository, focusing on improving the reliability of the SQL Agent workflow. During this period, Linh addressed a bug related to the handling of BaseMessage imports in sql_agent.py, which previously risked runtime errors and unstable message processing. By correcting the import and reorganizing the code, Linh ensured that the SQL Agent could reliably process different message types, supporting safer future refactoring. The work was implemented using Python and leveraged the Langchain framework, demonstrating attention to code hygiene and stability. Although no new features were shipped, the contribution enhanced the robustness of the existing system.