MCP Apps co-creator: half the web ships llms.txt, almost no agent reads it

AI Engineer · youtube · 2026-09-16

An interview with Liad Yosef, co-creator of the MCP Apps spec, on rebuilding the web for agents.

llms.txt ignored: His team found roughly half of tested websites publish llms.txt, the de facto standard telling agents how to work with a site — yet almost no agent reads it. Agents go straight to docs and the homepage; the minority that opened llms.txt only did so because docs mentioned it. That reframes the problem: instead of writing specs at agents, watch thousands of them actually try.

What MCP Apps unlocks: The spec lets a server hand a real interface back into the chat instead of being flattened into text. Two decades polished the browser tab, yet planning one anniversary still means learning four interfaces; break interfaces into atoms and let an assistant compose them, and nobody needs the dashboard.

Agents have no brand loyalty: His team asked their coding agent to pick an analytics service; it recommended one they'd never used over a decade-long vendor purely for the better server and API, and they switched. Ten years of polished UX lost to a tooling preference — and a product that forces an agent to open a browser gets remembered for it.

He also argues browser agents are a "faster horse," assistants become the entry point, and accessibility and agent readiness are the same work.

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MCP Apps co-creator: half the web ships llms.txt, almost no agent reads it

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