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Agent2Agent (A2A) protocol, core specification

Linux Foundationspecificationcontext entry

Verified 2026-10-13. Status as of 2026-10-13. All entries.

Seams: S1

Status

Latest release v1.0.1, 2026-05-28. Technical Steering Committee of eight company seats: Google, Microsoft, Cisco, AWS, Salesforce, ServiceNow, SAP, IBM.

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".

Committed next

None declared in the sources read.

Sources

Overlaps

A2A protocol, agent discovery, Model Context Protocol (MCP), core specification

Neighbours in the map

Neighbours of Agent2Agent (A2A) protocol, core specification in the map Each circle is an entry of the map and links to its page; the colour is the kind of body behind it, a filled circle is a core entry and a dashed circle a context entry. The entry in the middle, with the entries it overlaps and the entries named by the same seams. Overlaps (3)Share a seam (10)A2A protocol, agent discovery (Linux Foundation, core)A2A protocol Model Context Protocol (MCP), core specification (Linux Foundation, context)Model Context Protocol Personal Agent Consent & Trust Protocol (PACT), published by Decagon with Instinct (Industry, core)Personal Agent Consent… W3C AI Agent Protocol Community Group (W3C, core)W3C AI Agent Protocol C… S1 DNS for AI Discovery (DNS-AID, draft-mozleywilliams-dnsop-dnsaid) (IETF, context)DNS for AI Discovery S1 IETF DAWN, Discovery of Agents With Names (proposed WG) (IETF, core)IETF DAWN S1 AI Catalog (Agent Card Working Group) (Linux Foundation, core)AI Catalog S1 MCP Server Cards (ext-server-card, SEP-2127) (Linux Foundation, core)MCP Server Cards S1 Agentic Resource Discovery (ARD) (Independent, core)Agentic Resource Discov… S1 schema.org vocabulary for products, offers, sellers and lodging (current release) (Independent, context)schema.org vocabulary f… S1 Personal Agent Protocol (PAP, "Poppy"), published by Sierra with Meta (Industry, core)Personal Agent Protocol S1 Shopify, MCP surfaces for buyer agents, developers and merchants (Industry, context)Shopify S1 Universal Commerce Protocol (UCP) (Industry, core)Universal Commerce Prot… S1 Agent2Agent

Solid lines: overlaps declared by one of the two entries. Dashed lines, coloured by seam: entries named by the same seam (S1 to S4) in the seams note. Every node is a link.

Evidence and coverage

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.