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The Agent2Agent (A2A) Protocol is an open standard for communication and interoperability among independent—often opaque—AI agent systems. Because agents may be built with different frameworks, languages, and vendors, A2A provides a common language and interaction model.

Communicating the interoperability between systems using AI agents.

The Agent2Agent (A2A) Protocol is an open standard for communication and interoperability among independent—often opaque—AI agent systems. Because agents may be built with different frameworks, languages, and vendors, A2A provides a common language and interaction model.

License: Apache 2.0

Tags: agents

Properties: client, servers, cards, messages, tasks, part, artifacts, streaming, push notifications, context, etensions, transport, negotiation, authentication, authorization, and discovery for agent automation. A2A has the discovery, network, context

Website: https://a2a-protocol.org/latest/

Standards: JSON-RPC 2.0, gRPC


Last modified January 2, 2026: update (871c07bef)