generated: '2026-07-18'
method: searched
status: published
source: https://barnandwillow.com/.well-known/ucp
notes: >-
  Barn & Willow's storefront (a Shopify store) exposes an official hosted MCP
  server as the transport for the Universal Commerce Protocol (UCP) shopping
  service. The endpoint is advertised in /.well-known/ucp and /llms.txt. A raw
  tools/list call is gated on a UCP agent-profile URI, so the tool surface below
  is captured from the documented agent flow (/llms.txt) and the UCP shopping
  capability schemas referenced by the discovery profile; tool input schemas are
  published at ucp.dev and not reproduced verbatim here.
server:
  name: barn-and-willow-ucp-shopping
  transport: http
  url: https://barnandwillow.com/api/ucp/mcp
  protocol: UCP
  supported_versions:
  - '2026-04-08'
  - '2026-01-23'
  platform: Shopify
  auth:
    checkout_requires_human_approval: true
    oidc_scope: customer-account-mcp-api:full
capabilities:
- dev.ucp.shopping.catalog.search
- dev.ucp.shopping.catalog.lookup
- dev.ucp.shopping.cart
- dev.ucp.shopping.checkout
- dev.ucp.shopping.fulfillment
- dev.ucp.shopping.discount
- dev.ucp.shopping.order
- dev.shopify.catalog
tools:
- name: search_catalog
  description: Find products matching a buyer's intent (UCP catalog search).
  source: https://ucp.dev/2026-04-08/schemas/shopping/catalog_search.json
- name: create_cart
  description: Create a cart and add desired items.
  source: https://ucp.dev/2026-04-08/schemas/shopping/cart.json
- name: create_checkout
  description: Start the purchase flow from a cart.
  source: https://ucp.dev/2026-04-08/schemas/shopping/checkout.json
- name: update_checkout
  description: Set shipping address and fulfillment method on a checkout.
  source: https://ucp.dev/2026-04-08/schemas/shopping/fulfillment.json
- name: complete_checkout
  description: Finalize the purchase; buyer must approve payment (human-in-the-loop).
  source: https://ucp.dev/2026-04-08/schemas/shopping/checkout.json