WebMCP Proposal Lets Websites Expose Callable Actions to AI Agents

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WebMCP is a proposed standard that lets a webpage declare the actions it supports, along with JSON Schema definitions, so AI agents can call them directly instead of reading and clicking through the interface. Chrome announced an early preview in February 2026, and the specification is being developed at the W3C with Microsoft's involvement. Unlike server-side MCP, WebMCP tools run in the user's browser tab under the user's existing session, which avoids building a separate authentication system but introduces its own security considerations. The API is still experimental and its method names have changed between Chrome versions, so developers are advised to check current documentation before relying on it. The author suggests prototyping with WebMCP is worthwhile now, while committing a production launch to it is premature.

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