diff --git a/core/src/main/java/com/google/adk/tools/AgentTool.java b/core/src/main/java/com/google/adk/tools/AgentTool.java
index 5e8798d0e..ab821a221 100644
--- a/core/src/main/java/com/google/adk/tools/AgentTool.java
+++ b/core/src/main/java/com/google/adk/tools/AgentTool.java
@@ -25,6 +25,8 @@
 import com.google.adk.agents.ConfigAgentUtils;
 import com.google.adk.agents.ConfigAgentUtils.ConfigurationException;
 import com.google.adk.agents.LlmAgent;
+import com.google.adk.agents.RunConfig;
+import com.google.adk.agents.RunConfig.StreamingMode;
 import com.google.adk.events.Event;
 import com.google.adk.plugins.Plugin;
 import com.google.adk.runner.InMemoryRunner;
@@ -186,10 +188,17 @@ public Single<Map<String, Object>> runAsync(Map<String, Object> args, ToolContex
             ? ImmutableList.of(toolContext.invocationContext().pluginManager())
             : ImmutableList.of();
     Runner runner = new InMemoryRunner(this.agent, toolContext.agentName(), plugins);
+    // Follow the caller's RunConfig but run unary: only the last event becomes the result.
+    RunConfig callerRunConfig = toolContext.invocationContext().runConfig();
+    RunConfig runConfig =
+        callerRunConfig.streamingMode() == StreamingMode.NONE
+            ? callerRunConfig
+            : callerRunConfig.toBuilder().streamingMode(StreamingMode.NONE).build();
     return runner
         .sessionService()
         .createSession(toolContext.agentName(), "tmp-user", toolContext.state(), null)
-        .flatMapPublisher(session -> runner.runAsync(session.userId(), session.id(), content))
+        .flatMapPublisher(
+            session -> runner.runAsync(session.userId(), session.id(), content, runConfig))
         .doOnNext(
             event -> {
               if (event.actions() != null
diff --git a/core/src/test/java/com/google/adk/tools/AgentToolTest.java b/core/src/test/java/com/google/adk/tools/AgentToolTest.java
index 755cebc46..6a8b82f8d 100644
--- a/core/src/test/java/com/google/adk/tools/AgentToolTest.java
+++ b/core/src/test/java/com/google/adk/tools/AgentToolTest.java
@@ -16,6 +16,8 @@
 
 package com.google.adk.tools;
 
+import static com.google.adk.testing.TestUtils.createInvocationContext;
+import static com.google.adk.testing.TestUtils.createSubAgent;
 import static com.google.adk.testing.TestUtils.createTestAgentBuilder;
 import static com.google.adk.testing.TestUtils.createTestLlm;
 import static com.google.common.truth.Truth.assertThat;
@@ -26,12 +28,16 @@
 import com.google.adk.agents.ConfigAgentUtils.ConfigurationException;
 import com.google.adk.agents.InvocationContext;
 import com.google.adk.agents.LlmAgent;
+import com.google.adk.agents.RunConfig;
+import com.google.adk.agents.RunConfig.StreamingMode;
+import com.google.adk.agents.RunConfig.ToolExecutionMode;
 import com.google.adk.agents.SequentialAgent;
 import com.google.adk.models.LlmResponse;
 import com.google.adk.plugins.Plugin;
 import com.google.adk.plugins.PluginManager;
 import com.google.adk.sessions.InMemorySessionService;
 import com.google.adk.sessions.Session;
+import com.google.adk.testing.TestBaseAgent;
 import com.google.adk.testing.TestLlm;
 import com.google.adk.utils.ComponentRegistry;
 import com.google.common.collect.ImmutableList;
@@ -871,6 +877,43 @@ public Maybe<Content> beforeRunCallback(InvocationContext invocationContext) {
     assertThat(callbackCalled.get()).isFalse();
   }
 
+  @Test
+  public void call_propagatesCallerRunConfig() throws Exception {
+    TestBaseAgent testAgent = createSubAgent("agent_name");
+    AgentTool agentTool = AgentTool.create(testAgent);
+    RunConfig runConfig =
+        RunConfig.builder()
+            .toolExecutionMode(ToolExecutionMode.SEQUENTIAL)
+            .maxLlmCalls(7)
+            .customMetadata(ImmutableMap.of("tier", "x"))
+            .build();
+    ToolContext toolContext =
+        ToolContext.builder(createInvocationContext(testAgent, runConfig)).build();
+
+    Map<String, Object> unused =
+        agentTool.runAsync(ImmutableMap.of("request", "magic"), toolContext).blockingGet();
+
+    assertThat(testAgent.getLastInvocationContext().runConfig()).isEqualTo(runConfig);
+  }
+
+  @Test
+  public void call_withStreamingRunConfig_runsAgentWithoutStreaming() throws Exception {
+    for (StreamingMode streamingMode : ImmutableList.of(StreamingMode.SSE, StreamingMode.BIDI)) {
+      TestBaseAgent testAgent = createSubAgent("agent_name");
+      AgentTool agentTool = AgentTool.create(testAgent);
+      RunConfig runConfig = RunConfig.builder().streamingMode(streamingMode).maxLlmCalls(7).build();
+      ToolContext toolContext =
+          ToolContext.builder(createInvocationContext(testAgent, runConfig)).build();
+
+      Map<String, Object> unused =
+          agentTool.runAsync(ImmutableMap.of("request", "magic"), toolContext).blockingGet();
+
+      // Only the streaming mode changes; the other settings still come from the caller.
+      assertThat(testAgent.getLastInvocationContext().runConfig())
+          .isEqualTo(runConfig.toBuilder().streamingMode(StreamingMode.NONE).build());
+    }
+  }
+
   private ToolContext createToolContext(BaseAgent agent) {
     Session session =
         sessionService.createSession("test-app", "test-user", null, "test-session").blockingGet();