Developed enhanced access-denied messaging for Git server clone operations in the facebook/sapling repository, focusing on actionable feedback for users encountering ACL-related errors. Leveraging Rust for backend development, the work centered on providing detailed user identity context and specifying required access control lists directly in error messages. This approach improved troubleshooting efficiency, reduced support inquiries, and strengthened the security posture of repository access. The feature was delivered with a full commit trace, underwent thorough code review, and included comprehensive documentation updates. Emphasis was placed on maintainability, clarity in error handling, and effective cross-functional collaboration throughout the development process.