As far as I can tell it's mostly use-cases like "externalized claude code", accessible on mobile. Maybe the "agentic harness" is slightly tweaked for longer running tasks, but if it's really better claude code will copy the tweaks anyway, so I don't really see what the hype and point is.
My favorite use so far has been giving it a copy of my Calibre library. After having it write a few scripts and a skill, I can ask it questions about any book I’m reading.
This week I had it order a series internally chronological.
I could use the search on my Kindle or open Calibre myself, but a Signal message is much faster when it’s already got the SQLite file right there.