Calvin worked on reorganizing the test suite for the All-Hands-AI/agent-sdk repository, focusing on separating unit and integration tests into dedicated subdirectories to improve test organization and maintainability. Using Python and leveraging skills in refactoring and testing, Calvin implemented a new directory structure but ultimately rolled back the changes to preserve project stability. Throughout the process, Calvin maintained detailed commit messages and documentation, ensuring full auditability for QA and release planning. The work established a clear foundation and captured key learnings, setting the stage for a safer, incremental refactor of the test suite in future development cycles.