Google Proposes WebMCP as Open Web Standard — W3C Incubation, Chrome 149 Origin Trial, Booking.com and Shopify Already Testing

Chrome for Developers·high signal

Google announced WebMCP at I/O 2026, a proposed open web standard allowing developers to expose structured JavaScript functions and HTML forms directly to browser-based AI agents. The specification is being co-developed with Microsoft and incubated through the W3C Web Machine Learning community group, with an experimental origin trial starting in Chrome 149. Booking.com, Expedia, Instacart, Intuit, Shopify, and Redfin are already experimenting — this is the first serious attempt to standardize how AI agents interact with the web.