generated: '2026-08-28'
method: probed
source: https://docs.x.com/.well-known/agent-card.json
description: >-
  A2A Agent Card published by X on its documentation host. Found by direct probe;
  saved verbatim to a2a/x-agent-card.json. Never authored or derived.
discovery:
  path: /.well-known/agent-card.json
  canonical: true
  host: docs.x.com
x-evidence:
  fetched: '2026-08-28'
  url: https://docs.x.com/.well-known/agent-card.json
  http_status: 200
  content_type: application/json
  bytes: 860
card:
  name: X
  url: https://docs.x.com/
  version: 1.0.0
  protocolVersion: '0.3'
  preferredTransport: HTTP+JSON
  provider_organization: X
  documentationUrl: https://docs.x.com/
  skills_count: 1
grade: conformant
grade_basis:
  capabilities_is_object: true
  protocol_version_present: true
  skills_is_array: true
  preferred_transport_present: true
  default_input_modes_present: true
  default_output_modes_present: true
deviations:
- field: protocolVersion
  value: '0.3'
  note: >-
    The card declares A2A protocol 0.3, which predates A2A 1.0.0. It passes every hard
    conformance check, but a client pinned to 1.0.0 semantics should not assume 1.0-only
    fields are present.
- field: skills[].tags
  value: []
  note: The single skill declares an empty tags array, so the card carries no skill taxonomy.
- field: capabilities
  value: {streaming: false, pushNotifications: false}
  note: >-
    Both optional A2A transport capabilities are declared false. The card is a
    discovery/documentation surface pointing at docs.x.com, not an A2A task endpoint —
    the callable agent surface X actually ships is the MCP server at https://api.x.com/mcp
    (see mcp/x-mcp.yml).
- field: url
  value: https://docs.x.com/
  note: >-
    url, provider.url and documentationUrl all resolve to the docs site rather than to a
    distinct A2A message endpoint.
skills:
- id: x
  name: X
  url: https://docs.x.com/.well-known/agent-skills/x/skill.md
  saved_as: ../skills/x-x-skill.md
  description: >-
    Use when building applications that interact with X (formerly Twitter) data and
    functionality — search posts, manage user accounts, stream real-time data, publish
    content, manage direct messages, or analyze trends through REST API endpoints.