WebMCP Standard Lets Websites Expose Tools Directly to AI Agents

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A new open standard called WebMCP, incubated by the W3C and co-developed by engineers from Google and Microsoft, aims to change how AI assistants interact with websites. Instead of guessing at page layouts through screenshots and messy HTML, AI agents would use structured tools a site declares through a browser API. The article claims this approach raises task accuracy to about 98% and cuts token usage by roughly 89%, while letting sites redesign without breaking integrations. Because it runs client-side, agents inherit the user's existing cookies and logins, and sensitive actions such as payments can require on-screen user confirmation. WebMCP has entered a public Origin Trial in Chrome versions 149 to 156.

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