docopt.coffee is a CoffeeScript (and JavaScript) library that parses command‑line arguments by interpreting a usage/help string written in the docopt language. It lets developers define the interface in a readable docstring and automatically generates a parser that returns an object of option values, handling `-h/--help` and `--version` out of the box. It’s aimed at Node.js developers who want a DRY, self‑documenting way to process CLI arguments.