protocols · a2aproject

Agent2Agent (A2A)

Open protocol for interoperation between independent agents: each publishes an Agent Card describing its capabilities and endpoint, and agents then exchange tasks and streamed updates over HTTP using JSON-RPC and server-sent events. Complements the Model Context Protocol, which connects an agent to tools and data rather than to other agents.

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What is recorded

Publisher	a2aproject
Origin	United States
Licence	Apache-2.0
Pulls recorded here	2

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Registry record as of 2026-08-14. Identity, licence and parameter count are properties of a release and do not move; tier can, and the verify link above re-checks it against the live registry rather than this page.