Lee refactored the core of the crewAIInc/crewAI repository, focusing on modernizing its structure to enhance maintainability and accelerate future development. By moving the BaseTool class into the main package and centralizing tool description generation, Lee improved code organization and reduced the risk of regressions. The work involved updating import paths throughout the codebase, tests, and documentation, ensuring consistency and traceability. Using Python and Markdown, Lee emphasized modularity and clear documentation, laying a foundation for faster feature delivery. The depth of the refactor addressed both technical debt and workflow efficiency, reflecting a thoughtful approach to long-term project sustainability.