pallets/click ? reverse-engineered prompt

Build me a Python library for making command line tools that feels easy and polished to use.

I want to be able to define commands with decorators, add options and arguments, and get automatic help text without writing a lot of boilerplate. It should support nested subcommands, sensible defaults, and make it simple to print output, prompt the user for input, and parse common command line values cleanly.

Please include a small example app so I can see how someone would use it, and make sure the library is organized so bigger command line apps can grow over time. If you need to, look up current Python packaging and testing best practices online so the project feels modern and ready to use.