diff --git a/core/src/commonMain/kotlin/com/google/adk/kt/agents/InvocationContext.kt b/core/src/commonMain/kotlin/com/google/adk/kt/agents/InvocationContext.kt
index 02007a6b..bce99019 100644
--- a/core/src/commonMain/kotlin/com/google/adk/kt/agents/InvocationContext.kt
+++ b/core/src/commonMain/kotlin/com/google/adk/kt/agents/InvocationContext.kt
@@ -126,6 +126,12 @@ data class InvocationContext(
    */
   val eventsCompactionConfig: EventsCompactionConfig? = null,
 
+  /**
+   * Optional context cache configuration for this invocation, propagated from the [App]. When
+   * `null`, context caching is disabled for the invocation.
+   */
+  val contextCacheConfig: ContextCacheConfig? = null,
+
   // State
   /** The user content that started this invocation. Readonly. */
   val userContent: Content? = null,
diff --git a/core/src/commonMain/kotlin/com/google/adk/kt/runners/AbstractRunner.kt b/core/src/commonMain/kotlin/com/google/adk/kt/runners/AbstractRunner.kt
index 979ee930..5adc4e1e 100644
--- a/core/src/commonMain/kotlin/com/google/adk/kt/runners/AbstractRunner.kt
+++ b/core/src/commonMain/kotlin/com/google/adk/kt/runners/AbstractRunner.kt
@@ -546,6 +546,7 @@ abstract class AbstractRunner : Runner {
         pluginManager = pluginManager,
         resumabilityConfig = resumabilityConfig,
         eventsCompactionConfig = app?.eventsCompactionConfig,
+        contextCacheConfig = null,
       )
       .let {
         // Run callbacks and append user message to session
@@ -602,6 +603,7 @@ abstract class AbstractRunner : Runner {
         pluginManager = pluginManager,
         resumabilityConfig = resumabilityConfig,
         eventsCompactionConfig = app?.eventsCompactionConfig,
+        contextCacheConfig = null,
       )
 
     val currentContext =
diff --git a/core/src/commonTest/kotlin/com/google/adk/kt/runners/AbstractRunnerTest.kt b/core/src/commonTest/kotlin/com/google/adk/kt/runners/AbstractRunnerTest.kt
index 0e1b3b78..2288f21c 100644
--- a/core/src/commonTest/kotlin/com/google/adk/kt/runners/AbstractRunnerTest.kt
+++ b/core/src/commonTest/kotlin/com/google/adk/kt/runners/AbstractRunnerTest.kt
@@ -14,9 +14,12 @@
  * limitations under the License.
  */
 
+@file:OptIn(com.google.adk.kt.annotations.ExperimentalContextCachingFeature::class)
+
 package com.google.adk.kt.runners
 
 import com.google.adk.kt.agents.BaseAgent
+import com.google.adk.kt.agents.ContextCacheConfig
 import com.google.adk.kt.agents.InvocationContext
 import com.google.adk.kt.agents.LlmAgent
 import com.google.adk.kt.agents.ResumabilityConfig
@@ -60,8 +63,11 @@ class AbstractRunnerTest {
 
   class TestRunner(agent: BaseAgent, resumable: Boolean = true) :
     InMemoryRunner(
-      agent = agent,
-      resumabilityConfig = ResumabilityConfig(isResumable = resumable),
+      App(
+        appName = "InMemoryRunner",
+        rootAgent = agent,
+        resumabilityConfig = ResumabilityConfig(isResumable = resumable),
+      )
     ) {
     suspend fun callFindAgentToRun(context: InvocationContext, rootAgent: BaseAgent): BaseAgent {
       return findAgentToRun(context, rootAgent)
@@ -928,6 +934,30 @@ class AbstractRunnerTest {
     }
   }
 
+  // ----- Context cache config propagation -----
+
+  @Test
+  fun runAsync_appWithoutContextCacheConfig_invocationContextConfigIsNull() = runTest {
+    // Sentinel non-null so the assertion meaningfully verifies the runner left it unset.
+    var capturedConfig: ContextCacheConfig? = ContextCacheConfig()
+    val agent =
+      DummyAgent(name = "agent") { context ->
+        capturedConfig = context.contextCacheConfig
+        emit(
+          Event(
+            author = Role.MODEL,
+            invocationId = context.invocationId,
+            content = modelMessage("resp"),
+          )
+        )
+      }
+    val runner = InMemoryRunner(app = App(appName = "test_app", rootAgent = agent))
+
+    runner.runAsync(userId = "user", sessionId = "session", newMessage = userMessage("hi")).toList()
+
+    assertNull(capturedConfig)
+  }
+
   @Test
   fun runAsync_defaultSummarizerUsesRootLlmAgentModel() = runTest {
     // No summarizer supplied: the runner must build a default LlmEventSummarizer from the root