From the demo I saw, I actually really like this idea. I've thought about what generating UI on the fly for users with LLMs could look like, but my concern would always be wondering if the LLM was going to create a UI that's good, let alone usable?

So a few things that's got me a little fuzzy here with this protocol: how do I know the user is getting a UI that works? How do I test this? What kind of undertaking is it for a service to implement this protocol in their system (i.e., OpenAI, Anthropic, etc)? How do I know the model won't accidentally assign some critical functionality to the wrong button press in a generated UI?

And finally... my intuition is telling me, "oh like skills or mcp servers for embedding UI in the chat" - how far off is that thinking?