WebMCP support for Liquid and Hydrogen storefronts

Online stores now expose WebMCP tools that AI agents can call. Agents can search your catalog, manage the shopper's cart, and go to checkout on the shopper's behalf, all in the tab they're looking at.

The tools work through WebMCP, a proposed web standard that lets a page register tools with the browser. Without it, agents have to read every page's code and simulate clicks, which is slow and error-prone. The tools are live today on every Liquid storefront and on the Hydrogen developer preview. There's nothing to install or configure.

Everything an agent does happens on the shopper's live session. Cart tools call the same standard storefront actions that apps use, so if your theme opens a cart drawer on updates, agents trigger it too.

Here's what agents can call:

• Catalog: search_catalog, browse_store, get_product, and show_variant
• Cart: get_cart, update_cart, and cancel_cart
• Checkout and orders: proceed_to_checkout and manage_orders
• Other content: search_shop_policies_and_faqs

WebMCP is still an emerging standard, and agent support is currently limited to Chromium-based browsers through an origin trial. Shopify is helping shape the specification alongside Google and Microsoft.

Learn more in the WebMCP docs. If you're building your own agent, see Build commerce agents.