feat: disallow setting non-existent properties in BigQuery tools and credentials config

This will save the agent builder getting wrong impression if by mistake they set a property that does not exist.

PiperOrigin-RevId: 803208559

src/google/adk/tools/_google_credentials.py

@@ -26,6 +26,7 @@ from google.auth.exceptions import RefreshError
 from google.auth.transport.requests import Request
 import google.oauth2.credentials
 from pydantic import BaseModel
+from pydantic import ConfigDict
 from pydantic import model_validator
 
 from ..auth.auth_credential import AuthCredential
@@ -44,8 +45,7 @@ class BaseGoogleCredentialsConfig(BaseModel):
   """
 
   # Configure the model to allow arbitrary types like Credentials
-  model_config = {"arbitrary_types_allowed": True}
-
+  model_config = ConfigDict(arbitrary_types_allowed=True, extra="forbid")
   credentials: Optional[google.auth.credentials.Credentials] = None
   """The existing auth credentials to use. If set, this credential will be used
   for every end user, end users don't need to be involved in the oauthflow. This

src/google/adk/tools/bigquery/config.py

@@ -18,6 +18,7 @@ from enum import Enum
 from typing import Optional
 
 from pydantic import BaseModel
+from pydantic import ConfigDict
 from pydantic import field_validator
 
 from ...utils.feature_decorator import experimental
@@ -50,6 +51,9 @@ class WriteMode(Enum):
 class BigQueryToolConfig(BaseModel):
   """Configuration for BigQuery tools."""
 
+  # Forbid any fields not defined in the model
+  model_config = ConfigDict(extra='forbid')
+
   write_mode: WriteMode = WriteMode.BLOCKED
   """Write mode for BigQuery tools.
 

tests/unittests/tools/bigquery/test_bigquery_credentials.py

@@ -14,7 +14,7 @@
 
 from unittest import mock
 
-from google.adk.tools.bigquery.bigquery_credentials import BigQueryCredentialsConfig
+from google.adk.tools.bigquery import BigQueryCredentialsConfig
 # Mock the Google OAuth and API dependencies
 import google.auth.credentials
 import google.oauth2.credentials
@@ -171,3 +171,12 @@ class TestBigQueryCredentials:
         ),
     ):
       BigQueryCredentialsConfig()
+
+  def test_invalid_property_raises_error(self):
+    """Test BigQueryCredentialsConfig raises exception when setting invalid property."""
+    with pytest.raises(ValueError):
+      BigQueryCredentialsConfig(
+          client_id="test_client_id",
+          client_secret="test_client_secret",
+          non_existent_field="some value",
+      )

tests/unittests/tools/bigquery/test_bigquery_tool_config.py

@@ -27,8 +27,16 @@ def test_bigquery_tool_config_experimental_warning():
     BigQueryToolConfig()
 
 
+def test_bigquery_tool_config_invalid_property():
+  """Test BigQueryToolConfig raises exception when setting invalid property."""
+  with pytest.raises(
+      ValueError,
+  ):
+    BigQueryToolConfig(non_existent_field="some value")
+
+
 def test_bigquery_tool_config_invalid_application_name():
-  """Test BigQueryToolConfig with invalid application name."""
+  """Test BigQueryToolConfig raises exception with invalid application name."""
   with pytest.raises(
       ValueError,
       match="Application name should not contain spaces.",