I recently discovered Google App Actions for Google Assistant, decided to play around with it for a bit and it works great in general.
On my local device I have Gemini instead of Google Assistant though, which frequently answers something like “As a Large Language Model, I cannot do [xyz]…” to even the most basic questions like “Write a WhatsApp Message”.

What can Gemini do and what not? Are there any specific limitations how complex an app action can be or aren’t they supported at all (yet)?

I don’t really know much about all this Google-related stuff, and didn’t find any answers to my question online.