fix(config): forbid extra fields in AgentToolConfig

PiperOrigin-RevId: 789038376

Author: wuliang229

src/google/adk/tools/agent_tool.py

@@ -19,6 +19,7 @@
 
 from google.genai import types
 from pydantic import BaseModel
+from pydantic import ConfigDict
 from pydantic import model_validator
 from typing_extensions import override
 
@@ -27,6 +28,7 @@
 from ..memory.in_memory_memory_service import InMemoryMemoryService
 from ._forwarding_artifact_service import ForwardingArtifactService
 from .base_tool import BaseTool
+from .base_tool import BaseToolConfig
 from .base_tool import ToolArgsConfig
 from .tool_context import ToolContext
 
@@ -175,7 +177,7 @@ def from_config(
     )
 
 
-class AgentToolConfig(BaseModel):
+class AgentToolConfig(BaseToolConfig):
   """The config for the AgentTool."""
 
   agent: AgentRefConfig

src/google/adk/tools/base_tool.py

@@ -259,3 +259,10 @@ def my_function(config: ToolArgsConfig) -> BaseTool:
 
   args: Optional[ToolArgsConfig] = None
   """The args for the tool."""
+
+
+class BaseToolConfig(BaseModel):
+  """The base configurations for all the tools."""
+
+  model_config = ConfigDict(extra="forbid")
+  """Forbid extra fields."""