Willow Pump UCP Commerce MCP Server
Willow's online store at onewillow.com exposes a live, anonymous Model Context Protocol endpoint implementing the Universal Commerce Protocol (UCP) shopping service. An MCP client POSTs JSON-RPC to https://onewillow.com/api/ucp/mcp; tools/list answers unauthenticated and returns 13 tools with full JSON Schema 2020-12 input schemas covering catalog search and lookup, cart lifecycle, checkout lifecycle, and order retrieval. The runtime is Shopify's `universal-commerce` server (serverInfo name universal-commerce, version 0.1.0) served under Willow's own domain; the merchant identity in the discovery document is Willow's (merchant_name "Willow Pump", merchant_origin onewillow.com, Shopify shop id 15958015).
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Documentation
Documentation link · transport
Tools
search_catalog— Search for products from the online store, hosted on Shopify.lookup_catalog— Look up multiple products or variants by identifier.get_product— Retrieve complete product detail by identifier. Returns a singular product.create_cart— Creates a new cart.get_cart— Get the cart contents.update_cart— Perform updates to a cart.cancel_cart— Cancels a cart.create_checkout— Creates a checkout. Returns checkout details, line items, totals, discounts and taxes.get_checkout— Returns details about the checkout, including line items, totals, discounts and taxes.update_checkout— Updates a checkout (buyer, shipping address, delivery method, payment).complete_checkout— Completes a checkout and returns the checkout result, including order ID. Buyer approval of payment is required by the store's own agent instructions.cancel_checkout— Cancels a checkout.get_order— Get the details of an order. Observed to require a signed agent JWT — returns JSON-RPC -32000 AuthenticationRequired without one.
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