Package com.google.adk.a2a.agent

Class RemoteA2AAgent

java.lang.Object

com.google.adk.workflow.BaseNode

com.google.adk.agents.BaseAgent

com.google.adk.a2a.agent.RemoteA2AAgent

All Implemented Interfaces:

Node

public class RemoteA2AAgent
extends BaseAgent

Agent that communicates with a remote A2A agent via an A2A client.

The remote agent can be specified directly by providing an AgentCard to the builder, or it can be resolved automatically using the provided A2A client.

Key responsibilities of this agent include:

• Agent card resolution and validation
• Converting ADK session history events into A2A requests (Message)
• Handling streaming and non-streaming responses from the A2A client
• Buffering and aggregating streamed response chunks into ADK Events
• Converting A2A client responses back into ADK format

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RemoteA2AAgent.AgentCardResolutionError	Exception thrown when the agent card cannot be resolved.
static class	RemoteA2AAgent.Builder	Builder for RemoteA2AAgent.
static class	RemoteA2AAgent.TypeError	Exception thrown when a type error occurs.

Method Summary

Modifier and Type	Method	Description
static RemoteA2AAgent.Builder	builder()
boolean	isStreaming()
protected io.reactivex.rxjava3.core.Flowable<Event>	runAsyncImpl(InvocationContext invocationContext)	Agent-specific asynchronous logic.
protected io.reactivex.rxjava3.core.Flowable<Event>	runLiveImpl(InvocationContext invocationContext)	Agent-specific synchronous logic.
AgentEnums.AgentOrigin	toolOrigin()	Returns the origin of the tool when this agent is used as a tool.

Methods inherited from class com.google.adk.agents.BaseAgent

afterAgentCallback, beforeAgentCallback, canonicalAfterAgentCallbacks, canonicalBeforeAgentCallbacks, close, findAgent, findSubAgent, fromConfig, parentAgent, parentAgent, rootAgent, runAsync, runLive, runNode, subAgents

Methods inherited from class com.google.adk.workflow.BaseNode

config, description, inputSchema, name, outputSchema, rerunOnResume, stateSchema, waitForOutput

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.google.adk.workflow.Node

requiresAllPredecessors

Method Details

builder

public static RemoteA2AAgent.Builder builder()

isStreaming

public boolean isStreaming()

runAsyncImpl

protected io.reactivex.rxjava3.core.Flowable<Event> runAsyncImpl(InvocationContext invocationContext)

Description copied from class: BaseAgent

Agent-specific asynchronous logic.

Specified by:

runAsyncImpl in class BaseAgent

Parameters:

invocationContext - Current invocation context.

Returns:

stream of agent-generated events.

runLiveImpl

protected io.reactivex.rxjava3.core.Flowable<Event> runLiveImpl(InvocationContext invocationContext)

Description copied from class: BaseAgent

Agent-specific synchronous logic.

Specified by:

runLiveImpl in class BaseAgent

Parameters:

invocationContext - Current invocation context.

Returns:

stream of agent-generated events.

toolOrigin

public AgentEnums.AgentOrigin toolOrigin()

Description copied from class: BaseAgent

Returns the origin of the tool when this agent is used as a tool.

Overrides:

toolOrigin in class BaseAgent

Returns:

the tool origin, defaults to "BASE_AGENT".