CLI Builder

CLI Builder generates polished command-line interfaces using best-in-class libraries for each ecosystem: Typer or Click for Python, Commander.js or Yargs for Node.js.

Argument Parsing

Generated CLIs use declarative argument definitions with type coercion, default values, required/optional flags, and mutually exclusive groups. Help text is auto-generated from docstrings and type hints.

Subcommand Architecture

Git-style nested subcommands (e.g., `mytool db migrate`, `mytool db seed`) with shared options at the root level and command-specific options at each subcommand.

User Experience

• Progress bars — Rich/tqdm for Python, ora/cli-progress for Node.js
• Colored output — Semantic color coding (green=success, red=error, yellow=warning)
• Structured output — `--json` flag for machine-readable output
• Interactive prompts — inquirer for confirmations and multi-select inputs

Configuration Files

Auto-detects and loads config from `~/.config/mytool/config.toml` or project-local `.mytoolrc`. CLI flags override config file values. Config schema validated on load.

Shell Completion

Generates completion scripts for bash, zsh, and fish via `mytool --install-completion`. Completions include dynamic suggestions from live data (e.g., available profiles).