There's a new visitor in your logs: the AI agent, acting on someone's behalf. Right now it "uses" your site by reading the DOM and guessing which button does what. WebMCP replaces the guessing with a contract — your page declares structured tools an in-browser agent can call directly.
It's a draft W3C standard (Google + Microsoft) that shipped as an early preview in Chrome 146. Here's how to add it, step by step, with copy-paste code.
The mental model (read this first)
A WebMCP tool is three things:
a name
