Worked on security hardening for the modelcontextprotocol/servers repository by developing a Git command argument injection guard to improve input validation and prevent command injection vulnerabilities. Focused on backend development using Python, the work involved extending input checks to ensure user-supplied values could not be misinterpreted as command-line flags by GitPython subprocess calls. This approach reduced the risk of injection attacks in automated git operations, enhancing the reliability of CI/CD workflows and automation scripts. The changes consolidated security measures within the codebase, making external integrations safer and future audits more straightforward, with unit testing supporting the robustness of the implementation.