APIs, GUIs, CLIs, Services
==========================
You write a small program beginning with a lib that exposes an API (with
procedures to call).
Then you write a simple CLI, e.g. by using [Click][].
It would be great if it had a GUI for casual users (QT of course).
Let's integrate it with the rest of our Distributed Computing Platform (TM),
so you build a service ([Flask][] maybe?) obviously REST-Style.
And all of these are built by hand, because 500 lines of XML and
`FooFactoryFactoryConfigurator` is not your style.

There was WSDL, and there are WADL and RSDL. But what would be really cool is
ADL: API Description Language.

Writing a new tool should be a three-step process:

1. define the public API
2. write the lib
3. define the interfaces you want (and I mean CLI / GUI / Web API)

[Click]: https://click.palletsprojects.com/
[Flask]: https://flask.palletsprojects.com/