Agent Development Kit(ADK)

An easy-to-use and powerful framework to build AI agents.

src/google/adk/tools/google_search_tool.py

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+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from google.genai import types
+from typing_extensions import override
+
+from .base_tool import BaseTool
+from .tool_context import ToolContext
+
+if TYPE_CHECKING:
+  from ..models import LlmRequest
+
+
+class GoogleSearchTool(BaseTool):
+  """A built-in tool that is automatically invoked by Gemini 2 models to retrieve search results from Google Search.
+
+  This tool operates internally within the model and does not require or perform
+  local code execution.
+  """
+
+  def __init__(self):
+    # Name and description are not used because this is a model built-in tool.
+    super().__init__(name='google_search', description='google_search')
+
+  @override
+  async def process_llm_request(
+      self,
+      *,
+      tool_context: ToolContext,
+      llm_request: LlmRequest,
+  ) -> None:
+    llm_request.config = llm_request.config or types.GenerateContentConfig()
+    llm_request.config.tools = llm_request.config.tools or []
+    if llm_request.model and llm_request.model.startswith('gemini-1'):
+      if llm_request.config.tools:
+        print(llm_request.config.tools)
+        raise ValueError(
+            'Google search tool can not be used with other tools in Gemini 1.x.'
+        )
+      llm_request.config.tools.append(
+          types.Tool(google_search_retrieval=types.GoogleSearchRetrieval())
+      )
+    elif llm_request.model and llm_request.model.startswith('gemini-2'):
+      llm_request.config.tools.append(
+          types.Tool(google_search=types.GoogleSearch())
+      )
+    else:
+      raise ValueError(
+          f'Google search tool is not supported for model {llm_request.model}'
+      )
+
+
+google_search = GoogleSearchTool()