This solves the problem, thank you! Although I ended up making the ResponseViewModel a class as I was running into issues with the tool complaining about mutating the struct and then non-conforming to the tool protocol. There is probably a way to do it with it being a struct, but this seems like a good approach since I have to reset the vars to nil on the ResponseViewModel after each call to the LLM session.

Thanks for the reply. I'm using this slight code variation, because I really need a ModelEntity for physics stuff instantiated: let entity = try await ModelEntity(named: "Stone", in: realityKitContentBundle) And this is the error I get: Error Failed to find resource with name "Stone" in bundle Any other thoughts?