A2A Protocol
also: agent-to-agent protocol · Agent2Agent
The open standard for agents talking to other agents — discovery, task delegation, and result exchange.
A2A (Agent2Agent) standardizes how independent AI agents discover each other and collaborate: an agent publishes an agent card describing its capabilities, receives tasks over a common HTTP/JSON-RPC interface, streams progress, and returns artifacts. Where MCP connects one agent to its tools and data, A2A connects peer agents across vendors and frameworks — the two protocols are complementary layers of the emerging agent stack.