generated: '2026-09-04'
method: probed
source: https://onewillow.com/api/ucp/mcp
name: Willow Pump UCP Commerce MCP Server
description: >-
  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).
ownership_note: >-
  Platform-authored runtime, first-party surface. The MCP server code and tool schemas are Shopify's
  UCP implementation, not software Willow wrote; the endpoint, catalog, prices, carts and orders it
  serves are Willow's. Recorded as Willow's agent surface because it answers on Willow's registrable
  domain and transacts Willow's own products — not as a Willow-authored protocol implementation.
deployment:
  mode: remote
  endpoint: https://onewillow.com/api/ucp/mcp
  auth: none
  verified: probed
  note: >-
    tools/list and initialize answer anonymously. tools/call additionally requires a resolvable UCP
    agent profile URI in meta["ucp-agent"].profile, and order-scoped tools require a signed agent JWT
    (observed: get_order returns JSON-RPC -32000 "AuthenticationRequired ... a valid JWT is required").
    A second, equivalent endpoint answers on the Shopify-canonical host
    https://willowpump.myshopify.com/api/ucp/mcp. The endpoint is POST-only: a GET of
    https://onewillow.com/api/ucp/mcp returns the storefront's HTML 404 page, so a link-liveness
    crawler will read it as dead. It is not — it answered JSON-RPC 200 on 2026-09-04.
protocol:
  jsonrpc: '2.0'
  mcp_protocol_version: '2024-11-05'
  server_info:
    name: universal-commerce
    version: 0.1.0
  server_capabilities:
    - tools
    - prompts
    - resources
    - logging
  ucp_version: '2026-08-25'
  ucp_api_version_header: x-shopify-ucp-mcp-api-version
  transport: mcp (HTTP POST, application/json; Accept application/json, text/event-stream)
discovery:
  ucp_profile: https://onewillow.com/.well-known/ucp.json
  agent_instructions:
    - https://onewillow.com/agents.md
    - https://onewillow.com/llms.txt
  alternate_endpoint: https://willowpump.myshopify.com/api/ucp/mcp
  supported_ucp_versions:
    - '2026-08-25'
    - '2026-04-08'
    - '2026-01-23'
tool_count: 13
tools_manifest: mcp/willow-tools-list.json
tools:
  - name: search_catalog
    category: catalog
    write: false
    auth: agent-profile
    description: Search for products from the online store, hosted on Shopify.
  - name: lookup_catalog
    category: catalog
    write: false
    auth: agent-profile
    description: Look up multiple products or variants by identifier.
  - name: get_product
    category: catalog
    write: false
    auth: agent-profile
    description: Retrieve complete product detail by identifier. Returns a singular product.
  - name: create_cart
    category: cart
    write: true
    auth: agent-profile
    description: Creates a new cart.
  - name: get_cart
    category: cart
    write: false
    auth: agent-profile
    description: Get the cart contents.
  - name: update_cart
    category: cart
    write: true
    auth: agent-profile
    description: Perform updates to a cart.
  - name: cancel_cart
    category: cart
    write: true
    reverses: create_cart
    auth: agent-profile
    description: Cancels a cart.
  - name: create_checkout
    category: checkout
    write: true
    auth: agent-profile
    description: Creates a checkout. Returns checkout details, line items, totals, discounts and taxes.
  - name: get_checkout
    category: checkout
    write: false
    auth: agent-profile
    description: Returns details about the checkout, including line items, totals, discounts and taxes.
  - name: update_checkout
    category: checkout
    write: true
    auth: agent-profile
    description: Updates a checkout (buyer, shipping address, delivery method, payment).
  - name: complete_checkout
    category: checkout
    write: true
    idempotent: true
    idempotency_key: meta['idempotency-key'] (REQUIRED)
    auth: agent-profile
    description: >-
      Completes a checkout and returns the checkout result, including order ID. Buyer approval of
      payment is required by the store's own agent instructions.
  - name: cancel_checkout
    category: checkout
    write: true
    reverses: create_checkout
    auth: agent-profile
    description: Cancels a checkout.
  - name: get_order
    category: order
    write: false
    auth: jwt
    description: >-
      Get the details of an order. Observed to require a signed agent JWT — returns JSON-RPC -32000
      AuthenticationRequired without one.
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
payment_handlers:
  - com.google.pay
  - dev.shopify.card
  - dev.shopify.shop_pay
x-evidence:
  fetched: '2026-09-04'
  tools_list:
    url: https://onewillow.com/api/ucp/mcp
    method: POST
    body: '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
    http_status: 200
    content_type: application/json; charset=utf-8
    tool_count: 13
  initialize:
    url: https://onewillow.com/api/ucp/mcp
    http_status: 200
    protocol_version: '2024-11-05'
  discovery:
    url: https://onewillow.com/.well-known/ucp.json
    http_status: 200