chore: Update plugins in hello_world_app

hangfei · copybara-github · commit 4cb07ba05e80 · 2025-09-18T08:26:42.000-07:00
Corrected `CountInvocationPlugin` to be a class reference and added `ContextFilterPlugin` to limit the number of tool invocations kept in the context to 3.

PiperOrigin-RevId: 808591608
diff --git a/contributing/samples/hello_world_app/agent.py b/contributing/samples/hello_world_app/agent.py
@@ -20,6 +20,7 @@
 from google.adk.apps import App
 from google.adk.models.llm_request import LlmRequest
 from google.adk.plugins.base_plugin import BasePlugin
+from google.adk.plugins.context_filter_plugin import ContextFilterPlugin
 from google.adk.tools.tool_context import ToolContext
 from google.genai import types
 
@@ -141,5 +142,8 @@ async def before_model_callback(
 app = App(
     name='hello_world_app',
     root_agent=root_agent,
-    plugins=[CountInvocationPlugin()],
+    plugins=[
+        CountInvocationPlugin(),
+        ContextFilterPlugin(num_invocations_to_keep=3),
+    ],
 )
