During February 2026, Aball developed and integrated CLI shell completion for the rumdl command in the chenrui333/homebrew-core repository. Leveraging Ruby and Homebrew formula development skills, Aball implemented automatic shell completion generation as part of the rumdl installation process, allowing users to access command options more efficiently from the command line. This feature reduced the need for manual command-option lookups and improved onboarding by streamlining the user experience. The work involved driving the feature from initial concept through code changes in a core Homebrew repository, demonstrating depth in command line tool enhancement and a focus on usability improvements for end users.