# 1
- Hey claude, recommend me next book I could read
- sure, what about '1984'? Here is a button to send it directly to your kindle, it will be $4,99.
# 2
- I am looking for the hotel for two in Viena this weekend
- here are some offers and still available (displays grid view generated by mcp ui, handled by booking.com, each item has a button to "book now" directly)
So, basically -- it's a method for the MCP Server to display a UI element to the user allowing the user to perform some kind of action. Current, this UI will be an HTML iframe.
I think I got confused by their barchart example. I thought this would have been just as easily supported by the MCP server sending back a PNG/PDF of a barchart for the main interface to display (I also generally think of barcharts as static content). But, the idea of adding specific user interaction elements (buttons) helps to make the concept more clear to me.