What Is WebMCP? When to Expose Browser Tools to AI Agents

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WebMCP lets a web app declare structured tools that a browser agent can call. As the WebMCP specification defines it, each tool runs inside the page with access to the user's authenticated session and current application state. That context supports actions tied to what the user already has open, such as updating the current cart, saving a draft on the active support ticket, or creating an issue in the selected workspace. On September 28, 2026, Shopify added checkout WebMCP tools that can read checkout state; update buyer details, fulfillment, discount codes, declared fields, and payment; and

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