Developed and integrated a command-line shell completion feature for the rumdl tool within the chenrui333/homebrew-core repository, focusing on enhancing user onboarding and efficiency. The work involved extending the Homebrew formula using Ruby to automatically generate and install shell completions during the rumdl installation process, allowing users to access command options more intuitively. By embedding this functionality directly into the install flow, the solution reduced the need for manual configuration and improved command discoverability. The project demonstrated proficiency in Ruby, Homebrew formula development, and command line tooling, delivering a targeted usability improvement aligned with the repository’s product goals.