Why it matters

A2A enables agent interoperability. Understanding shapes multi-agent systems.

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The architecture

A2A server: ADK Java agent exposes A2A endpoint.

A2A client: ADK Java agent as A2A caller of other agents.

A2A integrationA2A serverexpose agentA2A clientcall other agentsCombineddelegating agentDelegating agent: receives A2A calls, forwards to specialists via A2A
A2A patterns.
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How it works end to end

Server: expose HTTP endpoint per A2A spec. Handle task lifecycle.

Client: A2A client SDK to invoke remote agents.

Auth: OAuth or API key per configuration.

Streaming: forward events via A2A streaming.