just

just is a project-local command runner that reads recipes from a justfile and executes them with parameters, dependencies, dotenv loading, and shell integration. It is most useful when a repo wants one discoverable entry point for build, test, deploy, and maintenance commands.

• Define named project tasks once and run them consistently from any subdirectory that can find the repo's justfile.
• List available recipes, inspect recipe definitions, and expose repo automation entry points without reading shell scripts by hand.
• Run build, test, deploy, and maintenance recipes with arguments, dependencies, dotenv loading, or arbitrary shebang languages.

• --list, --summary, --show, and --dump --dump-format json make existing project workflows discoverable and parsable before execution.
• Commands are non-interactive by default, honor exit codes, and --dry-run helps agents preview effects before running recipes.
• Best when a repo already captures useful operations in a justfile; just is a control layer over project scripts, not a service CLI with a fixed cross-project action surface.

• Automation value depends entirely on the local justfile; a repo with weak or unsafe recipes gives agents little reliable leverage.
• Some features lean interactive or human-oriented, such as --choose via fzf and --edit, and recipe bodies can run arbitrary shell code.