Developed and integrated shell completion support for the cargo command within the Homebrew/homebrew-core repository, focusing on enhancing developer productivity for zsh and bash users. Leveraged Ruby and shell scripting to generate completions using rustup’s completion generation path, ensuring accurate and up-to-date command suggestions while deliberately excluding Fish and PowerShell due to current tooling limitations. The implementation was incorporated into the standard Homebrew-core workflow, allowing contributors and end users to benefit from streamlined command-line usage as part of the default cargo installation. Documented the scope and rationale for shell support, laying groundwork for future cross-shell enhancements as tooling evolves.