Wes Bos has a pretty cool demo of this: https://www.youtube.com/watch?v=sOPhVSeimtI

I really like the way you can expose your schema through adding fields to a web form, that feels like a really nice extension and a great way to piggyback on your existing logic.

To me this seems much more promising than either needing an MCP server or the MCP Apps proposal.

Demo I built 5 months ago: https://www.youtube.com/watch?v=02O2OaNsLIk This exposes ecommerce specific tool calls as regular javascript functions as it is more lightweight than going the MCP route.

It's great they are working on standardizing this so websites don't have to integrate with LLMs. The real opportunity seems to be able to automatically generate the tool calls / MCP schema by inspecting the website offline - I automated this using PLayright MCP.