generated: '2026-09-05'
method: derived
source: mcp/3ntech-mcp-tools.json (live tools/list inputSchemas, 2026-09-05)
note: >-
  Derived from the JSON Schemas the live MCP endpoint returned. There is no OpenAPI to
  read $refs from, so relationships are taken from the fields the tool schemas actually
  declare (cart_id on checkout, line_items on both) and from the id form the tool
  descriptions publish. Nothing here is inferred from another provider's model.
identifiers:
  form: 'gid://shopify/<Type>/<id>'
  example: 'gid://shopify/Checkout/abc123'
  source: get_checkout inputSchema id description
entities:
- name: Product
  operations: [search_catalog, lookup_catalog, get_product]
  fields_observed: [id, selected, preferences]
  note: >-
    get_product takes catalog.id plus catalog.selected (variant selection) and
    catalog.preferences; lookup_catalog takes catalog.ids[] for batch resolution.
- name: Cart
  operations: [create_cart, get_cart, update_cart, cancel_cart]
  fields_observed: [line_items, buyer, context, attribution, fulfillment, discounts]
- name: Checkout
  operations: [create_checkout, get_checkout, update_checkout, complete_checkout, cancel_checkout]
  fields_observed: [payment, line_items, buyer, context, attribution, cart_id, fulfillment, discounts]
- name: Order
  operations: [get_order]
  fields_observed: [id]
  note: Read-only on this surface — no create, update, cancel or refund tool exists for an order.
- name: Buyer
  operations: []
  note: An embedded object on Cart and Checkout, not addressable on its own.
- name: LineItem
  operations: []
  note: An embedded collection on Cart and Checkout.
- name: Fulfillment
  operations: []
  note: >-
    Embedded on Cart and Checkout. The UCP profile declares dev.ucp.shopping.fulfillment
    with method_combinations [["shipping"]] and no multi-destination support.
- name: Discount
  operations: []
  note: Embedded on Cart and Checkout; dev.ucp.shopping.discount is declared in the UCP profile.
relationships:
- from: Checkout
  to: Cart
  type: belongs_to
  via: cart_id
  evidence: create_checkout inputSchema checkout.cart_id
- from: Cart
  to: LineItem
  type: has_many
  via: line_items
- from: Checkout
  to: LineItem
  type: has_many
  via: line_items
- from: Cart
  to: Buyer
  type: has_one
  via: buyer
- from: Checkout
  to: Buyer
  type: has_one
  via: buyer
- from: Checkout
  to: Fulfillment
  type: has_one
  via: fulfillment
- from: Cart
  to: Fulfillment
  type: has_one
  via: fulfillment
- from: Checkout
  to: Discount
  type: has_many
  via: discounts
- from: Order
  to: Checkout
  type: belongs_to
  via: implied by complete_checkout
  confidence: medium
  note: >-
    complete_checkout is the only path to an order on this surface, but no field in any
    tool schema names the link explicitly, so this edge is inferred from the flow rather
    than read from a schema.
money:
  representation: '{amount: integer minor units, currency: ISO 4217 code}'
  source: every tool description in mcp/3ntech-mcp-tools.json