Worked on the openai/codex repository with a focus on code maintenance and refactoring, specifically targeting code hygiene and long-term maintainability. Addressed a non-functional aspect of the codebase by removing an outdated comment in the defs.bzl file that referenced a deprecated cargo_build_script, thereby improving code clarity and supporting more efficient future code reviews. Utilized Python and Bazel build scripting to ensure the codebase remained clean and easy to navigate. The work centered on incremental improvements rather than feature development, demonstrating attention to detail and a commitment to maintaining high standards in code documentation and overall project structure.