diff --git a/core/src/main/java/com/google/adk/agents/LlmAgent.java b/core/src/main/java/com/google/adk/agents/LlmAgent.java
index b387aee34..077068283 100644
--- a/core/src/main/java/com/google/adk/agents/LlmAgent.java
+++ b/core/src/main/java/com/google/adk/agents/LlmAgent.java
@@ -772,7 +772,7 @@ public List<Object> toolsUnion() {
     return toolsUnion;
   }
 
-  public ImmutableList<BaseToolset> toolsets() {
+  public List<BaseToolset> toolsets() {
     return toolsets;
   }