Package com.google.adk.agents

Class SequentialAgent

java.lang.Object

com.google.adk.workflow.BaseNode

com.google.adk.agents.BaseAgent

com.google.adk.agents.SequentialAgent

All Implemented Interfaces:

Node

public class SequentialAgent
extends BaseAgent

An agent that runs its sub-agents sequentially.

Composition with LlmAgents: a SequentialAgent does not transfer control back to a parent LlmAgent. Use it as the root or transferred-to agent and place any follow-up LlmAgent as the next sibling. Upstream publishes via outputKey and downstream reads via {key} placeholders in its instruction:

 var draft =
     LlmAgent.builder()
         .name("draft")
         .model("gemini-flash-latest")
         .instruction("Draft a summary.")
         .outputKey("draft")
         .build();
 var reviewer =
     LlmAgent.builder()
         .name("reviewer")
         .model("gemini-flash-latest")
         .instruction("Polish the draft: {draft}")
         .build();
 var pipeline =
     SequentialAgent.builder().name("pipeline").subAgents(draft, reviewer).build();
 

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SequentialAgent.Builder	Builder for SequentialAgent.

Method Summary

Modifier and Type	Method	Description
static SequentialAgent.Builder	builder()
static SequentialAgent	fromConfig(SequentialAgentConfig config, String configAbsPath)	Creates a SequentialAgent from configuration.
protected io.reactivex.rxjava3.core.Flowable<Event>	runAsyncImpl(InvocationContext invocationContext)	Runs sub-agents sequentially.
protected io.reactivex.rxjava3.core.Flowable<Event>	runLiveImpl(InvocationContext invocationContext)	Runs sub-agents sequentially in live mode.

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

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

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 SequentialAgent.Builder builder()

runAsyncImpl

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

Runs sub-agents sequentially.

Three modes: with resumability on, a resume fast-forwards to the checkpointed sub-agent and pauses on a long-running call; with the deprecated shim on, the same happens but the resume point is reconstructed from history and nothing is checkpointed; with neither, sub-agents just run in order.

Specified by:

runAsyncImpl in class BaseAgent

Parameters:

invocationContext - Invocation context.

Returns:

Flowable emitting events from sub-agents.

runLiveImpl

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

Runs sub-agents sequentially in live mode.

Specified by:

runLiveImpl in class BaseAgent

Parameters:

invocationContext - Invocation context.

Returns:

Flowable emitting events from sub-agents in live mode.

fromConfig

public static SequentialAgent fromConfig(SequentialAgentConfig config,
 String configAbsPath)
                                  throws ConfigAgentUtils.ConfigurationException

Creates a SequentialAgent from configuration.

Parameters:

config - the agent configuration

configAbsPath - The absolute path to the agent config file.

Returns:

the configured SequentialAgent

Throws:

ConfigAgentUtils.ConfigurationException - if the configuration is invalid