feat: Add Google Maps Grounding Tool to ADK

This add `GoogleMapsGroundingTool`, a built-in tool for Gemini 2 models to ground query results with Google Maps. This tool operates internally within the model and is only available when using the VertexAI Gemini API.

PiperOrigin-RevId: 808650501

Author: KMarkert

src/google/adk/tools/__init__.py

@@ -23,6 +23,7 @@
 from .exit_loop_tool import exit_loop
 from .function_tool import FunctionTool
 from .get_user_choice_tool import get_user_choice_tool as get_user_choice
+from .google_maps_grounding_tool import google_maps_grounding
 from .google_search_tool import google_search
 from .load_artifacts_tool import load_artifacts_tool as load_artifacts
 from .load_memory_tool import load_memory_tool as load_memory
@@ -39,6 +40,7 @@
     'AuthToolArguments',
     'BaseTool',
     'enterprise_web_search',
+    'google_maps_grounding',
     'google_search',
     'url_context',
     'VertexAiSearchTool',

src/google/adk/tools/google_maps_grounding_tool.py

@@ -0,0 +1,68 @@
+# 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 ..utils.model_name_utils import is_gemini_1_model
+from ..utils.model_name_utils import is_gemini_model
+from .base_tool import BaseTool
+from .tool_context import ToolContext
+
+if TYPE_CHECKING:
+  from ..models import LlmRequest
+
+
+class GoogleMapsGroundingTool(BaseTool):
+  """A built-in tool that is automatically invoked by Gemini 2 models to ground query results with Google Maps.
+
+  This tool operates internally within the model and does not require or perform
+  local code execution.
+
+  Only available for use with the VertexAI Gemini API (e.g.
+  GOOGLE_GENAI_USE_VERTEXAI=TRUE)
+  """
+
+  def __init__(self):
+    # Name and description are not used because this is a model built-in tool.
+    super().__init__(name='google_maps', description='google_maps')
+
+  @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 is_gemini_1_model(llm_request.model):
+      raise ValueError(
+          'Google Maps grounding tool can not be used with Gemini 1.x models.'
+      )
+    elif is_gemini_model(llm_request.model):
+      llm_request.config.tools.append(
+          types.Tool(google_maps=types.GoogleMaps())
+      )
+    else:
+      raise ValueError(
+          f'Google maps tool is not supported for model {llm_request.model}'
+      )
+
+
+google_maps_grounding = GoogleMapsGroundingTool()