A2A
Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.
Enable different AI applications to communicate and work together using a shared protocol.
From the README
- Discover each other's capabilities.
- Negotiate interaction modalities (text, forms, media).
- Securely collaborate on long-running tasks.
- Operate without exposing their internal state, memory, or tools.
Excerpts from the project README on GitHub. Copyright and licensing remain with the respective authors.
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A2A has 25.6k stars on GitHub. It has been forked 2.6k times. A2A is written mainly in Shell. It has been in active development since 2025. A2A is available under the Apache-2.0 license. Its main topics are a2a, a2a-mcp, a2a-protocol, a2a-server.
What is A2A?
Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.
Is A2A open source?
A2A is an open-source project. It is released under the Apache-2.0 license.
Is A2A free?
Yes. A2A is free and open source — you can use, modify and self-host it.
What license does A2A use?
A2A is available under the Apache-2.0 license.
What language is A2A written in?
A2A is written mainly in Shell.
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