{
 "id": "a2a-core",
 "name": "Agent2Agent (A2A) protocol, core specification",
 "org": "Linux Foundation",
 "kind": "specification",
 "tier": "context",
 "status": "Latest release v1.0.1, 2026-05-28. Technical Steering Committee of eight company seats: Google, Microsoft, Cisco, AWS, Salesforce, ServiceNow, SAP, IBM.",
 "status_as_of": "2026-10-13",
 "relevance": "The AgentCard is defined in specification/a2a.proto as \"A self-describing manifest for an agent.\"; how cards are found is in a2a-discovery. PR #2081, merged on 2026-07-30, added section 7.6.4 to the specification: \"Agents MUST NOT treat the TASK_STATE_AUTH_REQUIRED state transition, by itself, as authorization for any particular operation.\"; the PR description calls the state \"a coordination signal, not an authorization grant\".",
 "sources": [
  {
   "url": "https://github.com/a2aproject/A2A/blob/main/specification/a2a.proto",
   "archived": "https://web.archive.org/web/20261014051215/https://github.com/a2aproject/A2A/blob/main/specification/a2a.proto",
   "read": "2026-10-03",
   "class": "normative"
  },
  {
   "url": "https://github.com/a2aproject/A2A/blob/main/GOVERNANCE.md",
   "archived": "https://web.archive.org/web/20261014051447/https://github.com/a2aproject/A2A/blob/main/GOVERNANCE.md",
   "read": "2026-10-03",
   "class": "normative"
  },
  {
   "url": "https://www.linuxfoundation.org/press/linux-foundation-launches-the-agent2agent-protocol-project-to-enable-secure-intelligent-communication-between-ai-agents",
   "archived": "https://web.archive.org/web/20261009075953/https://www.linuxfoundation.org/press/linux-foundation-launches-the-agent2agent-protocol-project-to-enable-secure-intelligent-communication-between-ai-agents",
   "read": "2026-10-03",
   "class": "decision"
  },
  {
   "url": "https://github.com/a2aproject/A2A/blob/main/docs/specification.md",
   "archived": "https://web.archive.org/web/20261014051730/https://github.com/a2aproject/A2A/blob/main/docs/specification.md",
   "read": "2026-10-08",
   "class": "normative"
  },
  {
   "url": "https://github.com/a2aproject/A2A/pull/2081",
   "archived": "https://web.archive.org/web/20261014051811/https://github.com/a2aproject/A2A/pull/2081",
   "read": "2026-10-08",
   "class": "third-party"
  },
  {
   "url": "https://www.iana.org/assignments/well-known-uris/well-known-uris.xml",
   "archived": "https://web.archive.org/web/20261014051947/https://www.iana.org/assignments/well-known-uris/well-known-uris.xml",
   "read": "2026-10-05",
   "class": "normative"
  }
 ],
 "overlaps": [
  "a2a-discovery",
  "mcp-core"
 ],
 "seams": [
  "S1"
 ],
 "verified": "2026-10-13",
 "evidence": {
  "read": "On 2026-10-13: the release list (latest v1.0.1, 2026-05-28),. On 2026-10-03: a2a.proto, docs/specification.md, GOVERNANCE.md, the release list.",
  "not_read": "Technical Steering Committee (TSC) minutes and recordings, specification chapters beyond the definitions, the project's later announcements."
 },
 "url": "https://frmoretto.github.io/agentic-standards-map/entries/a2a-core.html",
 "source_url": "https://github.com/frmoretto/agentic-standards-map/blob/a1ae242918902e0768e0e6a79bd2bffc4ac5cfa3/entries/a2a-core.yaml",
 "licence": "https://creativecommons.org/licenses/by/4.0/"
}