generated: '2026-09-17'
method: probed
source: https://developers.booking.com/.well-known/agent-card.json
name: Booking.com Developer Documentation agent card
summary: >-
  Booking.com serves a real A2A Agent Card from its developer portal host. The card advertises the
  documentation agent and, through an MCP extension, the anonymous documentation MCP server at
  https://developers.booking.com/mcp. No agent card is served on www.booking.com or on any API host
  (demandapi.booking.com answers 401 on every path including /.well-known/*).
discovery:
  path: /.well-known/agent-card.json
  canonical: true
  host: developers.booking.com
card: a2a/booking-com-agent-card.json
x-evidence:
  fetched: '2026-09-17'
  url: https://developers.booking.com/.well-known/agent-card.json
  http_status: 200
  content_type: application/json
grade: conformant
grade_basis: >-
  A2A 1.0.0 hard checks all pass - capabilities is an object, protocolVersion is present ("0.3.0"),
  and skills is an array. The optional fields preferredTransport, defaultInputModes and
  defaultOutputModes are all present as well.
card_facts:
  name: Developer Documentation
  url: https://developers.booking.com/a2a
  documentationUrl: https://developers.booking.com/
  version: 0.0.1
  protocolVersion: 0.3.0
  preferredTransport: HTTP+JSON
  streaming: false
  pushNotifications: false
  skills_declared: 0
  extensions:
  - uri: https://modelcontextprotocol.io
    params_url: https://developers.booking.com/mcp
deviations:
- id: empty-skills-array
  detail: >-
    skills is an empty array. The card is structurally conformant but advertises no skill, so an agent
    reading only the card learns nothing it can invoke; the invocable surface is reached through the
    MCP extension instead.
- id: a2a-endpoint-not-served
  detail: >-
    The card's own url, https://developers.booking.com/a2a, returned HTTP 404 with an HTML body when
    probed on 2026-09-17. The A2A transport the card names is not reachable; the MCP extension endpoint
    is.
  evidence:
    url: https://developers.booking.com/a2a
    http_status: 404
- id: pre-release-version
  detail: 'Card version is 0.0.1, self-marking as a first-cut publication.'
probed_hosts:
- host: developers.booking.com
  path: /.well-known/agent-card.json
  status: 200
  result: real AgentCard object
- host: developers.booking.com
  path: /.well-known/agent.json
  status: 404
  result: HTML 404 shell
- host: www.booking.com
  path: /.well-known/agent-card.json
  status: 404
  result: HTML 404 shell
- host: demandapi.booking.com
  path: /.well-known/agent-card.json
  status: 401
  result: API host rejects every anonymous request