generated: '2026-09-05'
method: probed
source: https://fourthandheart.com/api/ucp/mcp (JSON-RPC tools/list, HTTP 200, anonymous)
status: published
deployment:
  mode: remote
  endpoint: https://fourthandheart.com/api/ucp/mcp
  auth: none
  verified: probed
  note: 'tools/list answers anonymously over HTTP POST with no credential. Individual tools/call requests
    additionally require a meta.ucp-agent.profile URI naming the calling agent; a call without one is
    rejected with JSON-RPC -32001 invalid_profile_url. That is a UCP agent-identity requirement, not an
    API key, so the server is recorded as auth: none.'
server:
  name: universal-commerce
  version: 0.1.0
  transport: http
  url: https://fourthandheart.com/api/ucp/mcp
  protocol_version: '2024-11-05'
  capabilities:
  - tools
  - prompts
  - resources
  - logging
  source: probed initialize response, HTTP 200
protocol:
  name: Universal Commerce Protocol
  spec: https://ucp.dev
  version: '2026-08-25'
  supported_versions:
  - '2026-08-25'
  - '2026-04-08'
  - '2026-01-23'
  discovery: https://fourthandheart.com/.well-known/ucp
  service: dev.ucp.shopping
  schema: https://ucp.dev/2026-08-25/services/shopping/mcp.openrpc.json
ownership: 'The UCP profile names https://tava-life.myshopify.com as the canonical service host. That
  is this same store: tava-life.myshopify.com 301s to fourthandheart.com, and the shop id 6414473 in the
  UCP/OIDC documents matches the shopId embedded in the fourthandheart.com storefront HTML. tava-life
  is the merchant''s platform-assigned myshopify hostname, not a different company.'
human_approval_required: true
human_approval_note: 'The published agent instructions state that checkout completion requires contemporaneous
  buyer approval and that agents must not complete payment without explicit buyer consent. Source: https://fourthandheart.com/llms.txt'
tool_count: 13
tools:
- name: get_checkout
  category: checkout
  description: Returns details about the checkout, including line items, totals, and any applicable discounts
    or taxes.
  input_properties:
  - id
  - meta
  required:
  - meta
  - id
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: create_checkout
  category: checkout
  description: Creates a checkout. Returns checkout details, including line items, totals, and any applicable
    discounts or taxes.
  input_properties:
  - checkout
  - meta
  required:
  - meta
  - checkout
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: update_checkout
  category: checkout
  description: Updates a checkout. Returns checkout details, including line items, totals, and any applicable
    discounts or taxes.
  input_properties:
  - checkout
  - id
  - meta
  required:
  - meta
  - checkout
  - id
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: complete_checkout
  category: checkout
  description: Completes a checkout and returns the checkout result. Returns details about the completed
    checkout, including order ID, Thank You Page URL, or any errors encountered.
  input_properties:
  - checkout
  - id
  - meta
  required:
  - meta
  - id
  - checkout
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: cancel_checkout
  category: checkout
  description: Cancels a checkout.
  input_properties:
  - id
  - meta
  required:
  - meta
  - id
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: get_cart
  category: cart
  description: Get the cart contents
  input_properties:
  - id
  - meta
  required:
  - meta
  - id
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: create_cart
  category: cart
  description: Creates a new cart
  input_properties:
  - cart
  - meta
  required:
  - meta
  - cart
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: update_cart
  category: cart
  description: Perform updates to a cart.
  input_properties:
  - cart
  - id
  - meta
  required:
  - meta
  - cart
  - id
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: cancel_cart
  category: cart
  description: Cancels a cart.
  input_properties:
  - id
  - meta
  required:
  - meta
  - id
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: get_order
  category: order
  description: Get the details of an order
  input_properties:
  - id
  - meta
  required:
  - meta
  - id
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: search_catalog
  category: catalog
  description: Search for products from the online store, hosted on Shopify.
  input_properties:
  - catalog
  - meta
  required:
  - meta
  - catalog
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: lookup_catalog
  category: catalog
  description: Look up multiple products or variants by identifier.
  input_properties:
  - catalog
  - meta
  required:
  - meta
  - catalog
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
- name: get_product
  category: catalog
  description: Retrieve complete product detail by identifier. Returns a singular product
  input_properties:
  - catalog
  - meta
  required:
  - meta
  - catalog
  source: probed tools/list — inputSchema captured verbatim in mcp/4th-heart-mcp-tools.json
crosswalk: 'No tool crosswalk emitted: 4th & Heart publishes no OpenAPI, so there are no operationIds
  to bind these tools to. The read-only JSON endpoints named in llms.txt (/products/{handle}.json, /collections/{handle}/products.json)
  are Shopify storefront conventions, not a described contract.'