The "hey" tool itself is just a command-line interface to the messaging/scripting system built into the Haiku interface kit (that it's essentially built around)

The "hey" tool itself is just a command-line interface to the messaging/scripting system built into the Haiku interface kit (that it's essentially built around). Someone once wrote a module for Python to interface with it as well (although it's ancient and I doubt it works with modern Python: https://github.com/HaikuArchives/HeyModule https://github.com/HaikuArchives/HeyModule). And of course there is the Hey source itself, which you could use as a reference to write a new scripting platform with (https://github.com/haiku/haiku/blob/master/src/bin/hey.cpp https://github.com/haiku/haiku/blob/master/src/bin/hey.cpp).