Apply post-rebase changes: use experimental decorator and update unit test key

Author: Amaad Martin

core/src/tools/google_search_agent_tool.ts

@@ -6,6 +6,7 @@
 
 import {LlmAgent} from '../agents/llm_agent.js';
 import {BaseLlm} from '../models/base_llm.js';
+import {experimental} from '../utils/experimental.js';
 import {AgentTool} from './agent_tool.js';
 import {GOOGLE_SEARCH} from './google_search_tool.js';
 
@@ -36,6 +37,7 @@ export function createGoogleSearchAgent(model: string | BaseLlm): LlmAgent {
  * This is a workaround to support using google_search tool with other tools.
  * @experimental
  */
+@experimental
 export class GoogleSearchAgentTool extends AgentTool {
   constructor(agent: LlmAgent) {
     super({

core/src/tools/google_search_tool.ts

@@ -1,13 +1,17 @@
 /**
  * @license
- * Copyright 2025 Google LLC
+ * Copyright 2026 Google LLC
  * SPDX-License-Identifier: Apache-2.0
  */
 import {GenerateContentConfig} from '@google/genai';
 
 import {isGemini1Model, isGeminiModel} from '../utils/model_name.js';
 
-import {BaseTool, ToolProcessLlmRequest} from './base_tool.js';
+import {
+  BaseTool,
+  RunAsyncToolRequest,
+  ToolProcessLlmRequest,
+} from './base_tool.js';
 
 /**
  * A built-in tool that is automatically invoked by Gemini 2 models to retrieve
@@ -26,7 +30,7 @@ export class GoogleSearchTool extends BaseTool {
     this.model = options.model;
   }
 
-  runAsync(): Promise<unknown> {
+  runAsync(_request: RunAsyncToolRequest): Promise<unknown> {
     // This is a built-in tool on server side, it's triggered by setting the
     // corresponding request parameters.
     return Promise.resolve();

core/test/tools/google_search_agent_tool_test.ts

@@ -94,7 +94,7 @@ describe('GoogleSearchAgentTool', () => {
 
       // Verify state update called with grounding metadata
       expect(toolContext.state.update).toHaveBeenCalledWith({
-        'temp:_adk_grounding_metadata': mockGroundingMetadata,
+        'temp:grounding_metadata': mockGroundingMetadata,
       });
     });
   });