PaintAssistant is a library to authenticate the user via their Google account, and then listen for Firebase updates for their entry in the project's firebase database controlled by the server and Google Assistant with the Assistant Backend.
This project is specific to MS Paint IDE, though can serve as a great example if you're getting into this kind of thing.
This program has a primitive example of using the library, the only thing required on your system is Java 11. Download the latest demo jar from here, and run it via commandline like so:
The above screenshots show me saying "Hey google, can you run my code" and other actions on the same linked google account.