It has a heartbeat operation and you can message it via messaging apps.

Instead of going to your computer and launching claude code to have it do something, or setting up cron jobs to do things, you can message it from your phone whenever you have an idea and it can set some stuff up in the background or setup a scheduled report on its own, etc.

So it's not that it has to be running and generating tokens 24/7, it's just idling 24/7 any time you want to ping it.