generated: '2026-09-19'
method: derived
source: >-
  Derived by aligning the live anonymous tools/list of https://kannkidas.de/api/mcp (2 tools, saved to
  mcp/kannkidas-de-mcp-tools.json) and the A2A skill in a2a/kannkidas-de-agent-card.json with the 9 operations of
  openapi/kannkidas-de-openapi.yml (verbatim copy of https://kannkidas.de/openapi.json, version 1.1.0).
purpose: >-
  Bind each agent-facing tool to the REST operation that backs it so the tool inherits a real parameter contract,
  and record which of the three surfaces (REST, MCP, A2A) carries what. Neither MCP nor A2A is a projection of the
  whole REST contract: MCP carries the two commercial actions, A2A carries the one read, REST carries everything
  including search, registration and token issuance.
surfaces:
  rest_openapi: openapi/kannkidas-de-openapi.yml          # 9 operations, 8 schemas; anonymous fetch
  mcp: https://kannkidas.de/api/mcp                        # tools/list anonymous 200; checkout tool needs sponsorship:write
  a2a: https://kannkidas.de/api/a2a                        # JSON-RPC message/send anonymous 200, read-only
  graphql: null
crosswalk:
  - tool: list_sponsor_slots
    surface: mcp
    category: availability
    rest: [listSponsorSlots]
    binding: rest
    confidence: high
    note: Identical payload shape (slots[] of id/status); the MCP outputSchema additionally allows a status of "review" and a sponsor object, which the OpenAPI SlotList omits.
  - tool: create_sponsor_checkout
    surface: mcp
    category: commerce
    rest: [createSponsorPurchase]
    binding: rest
    confidence: high
    note: >-
      Same request contract (slot_id + buyer_confirmed const true, schema/agent-purchase.json) and the same
      Purchase response. The REST operation carries the idempotency key as the required Idempotency-Key header
      and requires oauth2 sponsorship:write; the MCP tool takes idempotency_key as an input property. Obtaining
      the token is REST-only: registerAgentClient then issueAgentAccessToken.
  - tool: list-sponsor-slots
    surface: a2a
    category: availability
    rest: [listSponsorSlots]
    binding: rest
    confidence: high
    note: A2A skill id from the agent card; a live message/send returned an artifact named sponsor-slot-availability with the same slots[] shape.
mcp_only: []
a2a_only: []
rest_only:
  - capability: content search
    operations: [searchProductsAndCategories, suggestSearchTerms, getSimilarProducts]
    note: Anonymous search over the published analyses; exposed to agents via llms.txt and the find-software skill, not as MCP tools.
  - capability: agent identity
    operations: [registerAgentClient, issueAgentAccessToken]
    note: OAuth client registration and token issuance — prerequisites for the MCP checkout tool but not tools themselves.
  - capability: purchase status
    operations: [getSponsorPurchase]
    note: Read a purchase by id (oauth2 sponsorship:read); MCP returns status_url instead of exposing a status tool.
  - capability: x402 demo
    operations: [getPaidSponsorBuyerBrief]
    note: 402-gated testnet buyer brief; explicitly not a sponsoring checkout.
coverage:
  mcp_tools_named: 2
  mcp_tools_bound: 2
  a2a_skills_named: 1
  a2a_skills_bound: 1
  mcp_only: 0
  rest_operations_total: 9
  rest_operations_with_tool: 2