diff --git a/src/google/adk/tools/bigquery/data_insights_tool.py b/src/google/adk/tools/bigquery/data_insights_tool.py
index b4fe8450..98476c5b 100644
--- a/src/google/adk/tools/bigquery/data_insights_tool.py
+++ b/src/google/adk/tools/bigquery/data_insights_tool.py
@@ -25,6 +25,8 @@ import requests
 from . import client
 from .config import BigQueryToolConfig
 
+_GDA_CLIENT_ID = "GOOGLE_ADK"
+
 
 def ask_data_insights(
     project_id: str,
@@ -129,6 +131,7 @@ def ask_data_insights(
     headers = {
         "Authorization": f"Bearer {credentials.token}",
         "Content-Type": "application/json",
+        "X-Goog-API-Client": _GDA_CLIENT_ID,
     }
     ca_url = f"https://geminidataanalytics.googleapis.com/v1alpha/projects/{project_id}/locations/{location}:chat"
 
@@ -149,7 +152,7 @@ def ask_data_insights(
             "systemInstruction": instructions,
             "options": {"chart": {"image": {"noImage": {}}}},
         },
-        "clientIdEnum": "GOOGLE_ADK",
+        "clientIdEnum": _GDA_CLIENT_ID,
     }
 
     resp = _get_stream(
diff --git a/src/google/adk/tools/data_agent/data_agent_tool.py b/src/google/adk/tools/data_agent/data_agent_tool.py
index 8b5a8882..ca58eb7c 100644
--- a/src/google/adk/tools/data_agent/data_agent_tool.py
+++ b/src/google/adk/tools/data_agent/data_agent_tool.py
@@ -23,6 +23,7 @@ from ..tool_context import ToolContext
 from .config import DataAgentToolConfig
 
 BASE_URL = "https://geminidataanalytics.googleapis.com/v1beta"
+_GDA_CLIENT_ID = "GOOGLE_ADK"
 
 
 def _get_http_headers(
@@ -41,6 +42,7 @@ def _get_http_headers(
   return {
       "Authorization": f"Bearer {credentials.token}",
       "Content-Type": "application/json",
+      "X-Goog-API-Client": _GDA_CLIENT_ID,
   }
 
 
@@ -294,7 +296,7 @@ def ask_data_agent(
         "dataAgentContext": {
             "dataAgent": data_agent_name,
         },
-        "clientIdEnum": "GOOGLE_ADK",
+        "clientIdEnum": _GDA_CLIENT_ID,
     }
     resp = _get_stream(
         chat_url,
diff --git a/tests/unittests/tools/bigquery/test_bigquery_data_insights_tool.py b/tests/unittests/tools/bigquery/test_bigquery_data_insights_tool.py
index c2bbe271..b62c6835 100644
--- a/tests/unittests/tools/bigquery/test_bigquery_data_insights_tool.py
+++ b/tests/unittests/tools/bigquery/test_bigquery_data_insights_tool.py
@@ -89,6 +89,12 @@ def test_ask_data_insights_success(mock_get_stream):
   assert result["response"] == "Final formatted string from stream"
   mock_get_stream.assert_called_once()
 
+  # Verify that the correct headers and client ID were passed to _get_stream
+  args, _ = mock_get_stream.call_args
+  headers = args[2]
+  assert headers["X-Goog-API-Client"] == "GOOGLE_ADK"
+  assert headers["Authorization"] == "Bearer fake-token"
+
 
 @mock.patch.object(data_insights_tool, "_get_stream")
 def test_ask_data_insights_handles_exception(mock_get_stream):
diff --git a/tests/unittests/tools/data_agent/test_data_agent_tool.py b/tests/unittests/tools/data_agent/test_data_agent_tool.py
index 6aa57e65..54b3e8d3 100644
--- a/tests/unittests/tools/data_agent/test_data_agent_tool.py
+++ b/tests/unittests/tools/data_agent/test_data_agent_tool.py
@@ -196,3 +196,16 @@ def test_get_stream_from_file(mock_post, case_file_path):
 
   # 6. Assert that the final list of dicts matches the expected output
   assert result == expected_final_list
+
+
+def test_get_http_headers_includes_client_id():
+  """Tests _get_http_headers includes the correct GDA client ID."""
+  mock_creds = mock.Mock()
+  mock_creds.token = "fake-token"
+
+  # pylint: disable=protected-access
+  headers = data_agent_tool._get_http_headers(mock_creds)
+
+  assert headers["X-Goog-API-Client"] == "GOOGLE_ADK"
+  assert headers["Content-Type"] == "application/json"
+  assert headers["Authorization"] == "Bearer fake-token"