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feat: Forward state delta to parent session #693

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feat: Forward state delta to parent session #693

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7 changes: 7 additions & 0 deletions core/src/main/java/com/google/adk/tools/AgentTool.java
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,13 @@ public Single<Map<String, Object>> runAsync(Map<String, Object> args, ToolContex
Event lastEvent = optionalLastEvent.get();
Optional<String> outputText = lastEvent.content().map(Content::text);

// Forward state delta to parent session.
if (lastEvent.actions() != null
&& lastEvent.actions().stateDelta() != null
&& !lastEvent.actions().stateDelta().isEmpty()) {
toolContext.state().putAll(lastEvent.actions().stateDelta());
}

if (outputText.isEmpty()) {
return ImmutableMap.of();
}
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31 changes: 31 additions & 0 deletions core/src/test/java/com/google/adk/tools/AgentToolTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;

import com.google.adk.agents.Callbacks.AfterAgentCallback;
import com.google.adk.agents.ConfigAgentUtils.ConfigurationException;
import com.google.adk.agents.InvocationContext;
import com.google.adk.agents.LlmAgent;
Expand All @@ -35,6 +36,7 @@
import com.google.genai.types.Part;
import com.google.genai.types.Schema;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.core.Maybe;
import java.util.Map;
import java.util.Optional;
import org.junit.Test;
Expand Down Expand Up @@ -421,6 +423,35 @@ public void call_withoutInputSchema_requestIsSentToAgent() throws Exception {
.containsExactly(Content.fromParts(Part.fromText("magic")));
}

@Test
public void call_withStateDeltaInResponse_propagatesStateDelta() throws Exception {
AfterAgentCallback afterAgentCallback =
(callbackContext) -> {
callbackContext.state().put("test_key", "test_value");
return Maybe.empty();
};
TestLlm testLlm =
createTestLlm(
LlmResponse.builder()
.content(Content.fromParts(Part.fromText("test response")))
.build());
LlmAgent testAgent =
createTestAgentBuilder(testLlm)
.name("agent name")
.description("agent description")
.afterAgentCallback(afterAgentCallback)
.build();
AgentTool agentTool = AgentTool.create(testAgent);
ToolContext toolContext = createToolContext(testAgent);

assertThat(toolContext.state()).doesNotContainKey("test_key");

Map<String, Object> unused =
agentTool.runAsync(ImmutableMap.of("request", "magic"), toolContext).blockingGet();

assertThat(toolContext.state()).containsEntry("test_key", "test_value");
}

private static ToolContext createToolContext(LlmAgent agent) {
return ToolContext.builder(
new InvocationContext(
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