During December 2025, Galaxy-0 enhanced the openai/codex repository by improving the reliability of its Git tooling. They developed a feature that preserves staged changes during the undo operation, ensuring that reverting the working tree no longer affects the staging area and eliminating the need for the --staged flag. This update addressed issues where undo could previously cause loss of staged work, reducing risk for contributors. Galaxy-0 implemented regression tests in Rust to validate the new behavior and integrated these into the automated test suite. Their work demonstrated careful attention to developer experience, code review, and robust testing practices using git.