Worked on the zsh-users/zsh repository to enhance the reliability of Git command completion by addressing a nuanced bug affecting the handling of --git-dir and --work-tree parameters. Focused on shell scripting and command line tools, the contribution involved delivering a concise patch that resolved an edge case for users operating in non-standard repository layouts. The fix was clearly documented and linked to a specific GitHub issue for traceability, ensuring maintainability and transparency. By improving the predictability of command completion in zsh, this work supported developers who rely on advanced Git workflows, demonstrating attention to detail and a methodical engineering approach.