No, I don't think you're thinking about this right. It's more like hacker news would expose an MCP when you visit it that would present an alternative and parallel interface to the page, not "click button" tools.

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cush 3 hours ago | parent [-]

You're both right. The page can expose MCP tools like via a form element which is as simple as adding an attribute to an existing form and completely aligns with existing semantic HTML - eg submitting an HN "comment". Additionally, the page can define additional tools in javascript that aren't in forms - eg YouTube could provide a transcript MCP defined in JS which fetches the video's transcript

https://developer.chrome.com/blog/webmcp-epp

	▲	znpy an hour ago \| parent [-]
		I think that rest and html could probably be already used for this purpose BUT html is often littered with elements used for visual structure rather than semantics. In an ideal world html documents should be very simple and everything visual should be done via css, with JavaScript being completely optional. In such a world agents wouldn’t really need a dedicated protocol (and websites would be much faster to load and render, besides being much lighter on cpu and battery)