WebMCP is a proposed web standard that lets websites expose structured JavaScript tools for AI agents to discover and invoke, replacing brittle screen-scraping of buttons, HTML and visual layouts. A page can register actions such as booking a table, checking out, filtering results or adding a to-do item, with JSON Schema definitions for their inputs and outputs. The tools execute within the user’s already open and authenticated browser tab, using site functions that already exist rather than requiring a separate automation bot. Google and Microsoft are developing WebMCP in the W3C Web Machine Learning Community Group. It remains a Community Group draft rather than a finished W3C standard or standards-track specification. Chrome offers it behind a testing flag, and the current API uses document.modelContext; earlier drafts used navigator.modelContext. ChatGPT supports WebMCP-enabled pages, according to an OpenAI Developers post dated August 26, 2026. The design includes same-origin tool registration through a tools Permissions Policy, visible execution in an open browsing context, optional confirmation for sensitive actions, and annotations including readOnlyHint and untrustedContentHint. These protections do not eliminate security risks, and the security model is still under development. WebMCP could enable agent-operated commerce, bookings, scheduling and support flows when sites explicitly expose the necessary tools and users approve consequential actions.

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