generated: '2026-07-21'
method: searched
status: published
source: https://www.untuckit.com/agents.md
description: UNTUCKit's Shopify storefront operates a live, first-party-hosted MCP endpoint as the transport
  for the Universal Commerce Protocol (UCP) shopping service. The endpoint, its OpenRPC schema, and the
  agent flow are published in the store's agents.md / llms.txt and advertised in the UCP merchant profile
  at /.well-known/ucp (saved at well-known/untuckit-ucp.json). A live POST tools/list probe on 2026-07-21
  answered with a JSON-RPC UCP-discovery error requiring an agent profile URI, confirming the endpoint
  is live and gated on the UCP agent-profile handshake.
server:
  name: untuckit-storefront-ucp
  transport: http
  url: https://www.untuckit.com/api/ucp/mcp
  canonical_url: https://untuckit.myshopify.com/api/ucp/mcp
  protocol: UCP shopping service over MCP (JSON-RPC, Content-Type application/json)
  schema: https://ucp.dev/2026-04-08/services/shopping/mcp.openrpc.json
  discovery: https://www.untuckit.com/.well-known/ucp
  auth: UCP agent-profile handshake; customer-scoped access via Shopify Customer Account OAuth (scope
    customer-account-mcp-api:full, see well-known/untuckit-openid-configuration.json). Payment completion
    always requires explicit buyer approval.
  rate_limits: Rate-limited per IP; agents are told to back off on 429.
  versions:
  - '2026-04-08'
  - '2026-01-23'
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
tools:
- name: search_catalog
  description: Search the store catalog for products matching the buyer's intent.
- name: create_cart
  description: Create a cart and add desired items.
- name: create_checkout
  description: Start the purchase flow for a cart.
- name: update_checkout
  description: Set shipping address and shipping method on a checkout.
- name: complete_checkout
  description: Finalize the purchase; the buyer must approve payment.
notes: Tool names are the documented agent flow published verbatim in agents.md; the authoritative machine-readable
  tool schemas come from MCP tools/list after the UCP agent-profile handshake. The store also recommends
  the cross-store Shopify Shop skill (https://shop.app/SKILL.md) for personal shopping agents.
deployment:
  mode: remote
  endpoint: https://www.untuckit.com/api/ucp/mcp
  verified: probed
  probe: live
  tools: 13
  checked: '2026-08-12'
  source: catalog MCP census