Developed a new command-line interface feature for the martinvonz/jj repository, focusing on improving configuration hygiene by enabling automated cleanup of stale repository configuration directories. Leveraging Rust for robust file system operations and incorporating thorough unit testing, the solution introduced the 'jj config gc' command, which identifies and safely deletes configuration directories for repositories no longer present on disk. The implementation emphasized safety by including conservative checks and guardrails to prevent accidental data loss, aligning with maintainer goals for reliability and user experience. This work reduced disk usage, streamlined configuration maintenance, and enhanced documentation to guide users in adopting the new workflow.