chore: Migrate Google tools to use the new feature decorator

Co-authored-by: Xuan Yang <xygoogle@google.com>
PiperOrigin-RevId: 842321126

tests/unittests/tools/spanner/test_spanner_tool_settings.py

@@ -14,6 +14,9 @@
 
 from __future__ import annotations
 
+import warnings
+
+from google.adk.features._feature_registry import _WARNED_FEATURES
 from google.adk.tools.spanner.settings import Capabilities
 from google.adk.tools.spanner.settings import QueryResultMode
 from google.adk.tools.spanner.settings import SpannerToolSettings
@@ -22,6 +25,12 @@ from pydantic import ValidationError
 import pytest
 
 
+@pytest.fixture(autouse=True)
+def reset_warned_features():
+  """Reset warned features before each test."""
+  _WARNED_FEATURES.clear()
+
+
 def common_spanner_vector_store_settings(vector_length=None):
   return {
       "project_id": "test-project",
@@ -36,11 +45,10 @@ def common_spanner_vector_store_settings(vector_length=None):
 
 def test_spanner_tool_settings_experimental_warning():
   """Test SpannerToolSettings experimental warning."""
-  with pytest.warns(
-      UserWarning,
-      match="Tool settings defaults may have breaking change in the future.",
-  ):
+  with warnings.catch_warnings(record=True) as w:
     SpannerToolSettings()
+    assert len(w) == 1
+    assert "SPANNER_TOOL_SETTINGS is enabled." in str(w[0].message)
 
 
 def test_spanner_vector_store_settings_all_fields_present():