Tos Lunar contributed targeted improvements to open source Python projects, focusing on type safety and documentation quality. In ndmitchell/typeshed, Tos corrected the tqdm.as_completed yield type hint for asyncio, ensuring static types accurately reflected runtime behavior and reducing type errors for downstream users. This work involved precise stub development and type hinting, enhancing reliability for asynchronous workflows. Later, in astral-sh/ruff, Tos updated the documentation to clarify the unnecessary-escaped-quote (Q004) lint rule, aligning it with formatter compatibility guidelines. These contributions, delivered in Python and Markdown, demonstrated careful attention to code quality, maintainability, and the needs of both users and contributors.