generated: '2026-09-04'
method: probed
source: https://williesreserve.com/.well-known/ucp
description: >-
  Cross-cutting and domain-standard conformance asserted from documents the store itself serves —
  the UCP merchant profile, the OpenID Connect discovery document, and a live MCP initialize /
  tools/list exchange. Nothing here is inferred from marketing prose.
conformance:
- id: oauth2
  conforms: true
  evidence: https://williesreserve.com/.well-known/oauth-authorization-server
  note: RFC 8414 authorization-server metadata served on the store's own domain, with PKCE S256 and authorization_code + refresh_token grants.
- id: oidc
  conforms: true
  evidence: https://williesreserve.com/.well-known/openid-configuration
  note: OpenID Connect Discovery 1.0 document; RS256 id_token signing, standard claim set.
- id: rfc8414
  conforms: true
  evidence: https://williesreserve.com/.well-known/oauth-authorization-server
- id: pkce
  conforms: true
  evidence: https://williesreserve.com/.well-known/openid-configuration
  note: code_challenge_methods_supported = ["S256"].
- id: jsonrpc-2.0
  conforms: true
  evidence: https://williesreserve.com/api/ucp/mcp
  note: MCP endpoint answers JSON-RPC 2.0 requests; initialize and tools/list both returned {"jsonrpc":"2.0"} envelopes.
- id: mcp
  conforms: true
  evidence: https://williesreserve.com/api/ucp/mcp
  note: >-
    Model Context Protocol, negotiated protocolVersion 2024-11-05, serverInfo
    universal-commerce/0.1.0, capabilities tools/prompts/resources/logging.
- id: json-schema-2020-12
  conforms: true
  evidence: mcp/willie-s-reserve-mcp-tools-list.json
  note: Every tool inputSchema declares $schema https://json-schema.org/draft/2020-12/schema.
- id: iso4217
  conforms: true
  evidence: mcp/willie-s-reserve-mcp-tools-list.json
  note: Money is expressed as ISO 4217 minor units paired with a currency code across all tools.
- id: iso3166-1-alpha-2
  conforms: true
  evidence: mcp/willie-s-reserve-mcp-tools-list.json
  note: Address country fields are specified as 2-letter ISO 3166-1 alpha-2.
- id: bcp47
  conforms: true
  evidence: mcp/willie-s-reserve-mcp-tools-list.json
  note: context.language is specified as an IETF BCP 47 language tag.
- id: rfc9457
  conforms: false
  evidence: https://williesreserve.com/api/ucp/mcp
  note: Errors travel in JSON-RPC error objects, not application/problem+json.
- id: pagination
  conforms: true
  evidence: mcp/willie-s-reserve-mcp-tools-list.json
  note: search_catalog returns pagination.cursor for subsequent pages.
- id: idempotency
  conforms: partial
  evidence: mcp/willie-s-reserve-mcp-tools-list.json
  note: meta.idempotency-key is accepted by complete_checkout only; the other six mutating tools accept no key.
domain_standard:
- id: ucp
  name: Universal Commerce Protocol
  conforms: true
  version: '2026-08-25'
  spec: https://ucp.dev/2026-08-25/specification/overview/
  evidence: https://williesreserve.com/.well-known/ucp
  declared_in: /.well-known/ucp — services["dev.ucp.shopping"] and the capabilities block
  supported_versions:
  - '2026-08-25'
  - '2026-04-08'
  - '2026-01-23'
  capabilities:
  - dev.ucp.shopping.cart
  - dev.ucp.shopping.checkout
  - dev.ucp.shopping.fulfillment
  - dev.ucp.shopping.discount
  - dev.ucp.shopping.order
  - dev.ucp.shopping.catalog.search
  - dev.ucp.shopping.catalog.lookup
  - dev.shopify.catalog
  payment_handlers:
  - id: com.google.pay
    version: '2026-01-11'
    card_networks: [VISA, MASTERCARD, AMEX, DISCOVER]
  - id: dev.shopify.card
    version: '2026-01-15'
    card_brands: [visa, master, american_express, discover, diners_club]
  note: >-
    This is the domain standard for agent-driven retail commerce, and the store declares it in a
    machine-readable profile rather than claiming it in prose: an agent that already speaks UCP
    can transact here with no bespoke connector.
compliance:
  certifications: []
  note: >-
    No trust center, SOC 2 / ISO 27001 / PCI claim or compliance page was found on the store's own
    surface; card handling is delegated to the platform's payment handlers. No Compliance pointer
    is emitted.
checked: '2026-09-04'