Google I/O 2026: WebMCP open standard for browser-based AI agents

Category: Dev tools
Status: confirmed
Sources: Chrome Developers blog, Google Developers blog
Summary: Google announced WebMCP at Google I/O 2026, a proposed open web standard that lets developers expose structured JavaScript functions and HTML form endpoints to browser-based AI agents, replacing visual DOM scraping. WebMCP is co-developed by Google and Microsoft in the W3C Web Machine Learning Community Group. An origin trial begins in Chrome 149. Gemini in Chrome will gain WebMCP API support. Internal testing showed 67% fewer errors and 45% better task completion rates compared to visual scraping for the same tasks.
Why it matters: WebMCP defines how web applications advertise machine-callable interfaces to AI agents; developers who adopt it early gain reliable agent interaction before visual scraping becomes a legacy path.