Hiya!
These haven't been documented yet as we haven't finalized how they will work or what commands will be available - they are still in an "experimental" state.
We've been on a detour fleshing out other parts of Assistant, but we will come back to these and finish them properly, with documentation & autocomplete within the UI itself.
For now I will let someone from the AI team jump in here and tease what is available for now.