diff --git a/core/src/main/java/com/google/adk/tools/UrlContextTool.java b/core/src/main/java/com/google/adk/tools/UrlContextTool.java
index 5fe072d76..11c140e2b 100644
--- a/core/src/main/java/com/google/adk/tools/UrlContextTool.java
+++ b/core/src/main/java/com/google/adk/tools/UrlContextTool.java
@@ -62,7 +62,7 @@ public Completable processLlmRequest(
     updatedToolsBuilder.addAll(existingTools);
 
     String model = llmRequestBuilder.build().model().get();
-    if (model != null && model.startsWith("gemini-2")) {
+    if (model != null && (model.startsWith("gemini-2") || model.startsWith("gemini-3"))) {
       updatedToolsBuilder.add(Tool.builder().urlContext(UrlContext.builder().build()).build());
       configBuilder.tools(updatedToolsBuilder.build());
     } else {