refactor: improve argument validation in BaseTool

- Introduced a new private method  to handle argument validation for tools, enhancing code clarity and reusability.
- Updated the  method to utilize the new validation method, ensuring consistent error handling for invalid arguments.
- Enhanced exception handling to specifically catch , providing clearer error messages for tool argument validation failures.

lib/crewai/src/crewai/tools/base_tool.py

@@ -18,6 +18,7 @@ from pydantic import (
     BaseModel as PydanticBaseModel,
     ConfigDict,
     Field,
+    ValidationError,
     create_model,
     field_validator,
 )
@@ -150,19 +151,23 @@ class BaseTool(BaseModel, ABC):
 
         super().model_post_init(__context)
 
+    def _validate_kwargs(self, kwargs: dict[str, Any]) -> dict[str, Any]:
+        if kwargs and self.args_schema is not None and self.args_schema.model_fields:
+            try:
+                validated = self.args_schema.model_validate(kwargs)
+                return {k: getattr(validated, k) for k in validated.model_fields}
+            except ValidationError as e:
+                raise ValueError(
+                    f"Tool '{self.name}' arguments validation failed: {e}"
+                ) from e
+        return kwargs
+
     def run(
         self,
         *args: Any,
         **kwargs: Any,
     ) -> Any:
-        if kwargs and self.args_schema is not None and self.args_schema.model_fields:
-            try:
-                validated = self.args_schema.model_validate(kwargs)
-                kwargs = validated.model_dump()
-            except Exception as e:
-                raise ValueError(
-                    f"Tool '{self.name}' arguments validation failed: {e}"
-                ) from e
+        kwargs = self._validate_kwargs(kwargs)
 
         result = self._run(*args, **kwargs)
 
@@ -339,14 +344,7 @@ class Tool(BaseTool, Generic[P, R]):
         Returns:
             The result of the tool execution.
         """
-        if kwargs and self.args_schema is not None and self.args_schema.model_fields:
-            try:
-                validated = self.args_schema.model_validate(kwargs)
-                kwargs = validated.model_dump()
-            except Exception as e:
-                raise ValueError(
-                    f"Tool '{self.name}' arguments validation failed: {e}"
-                ) from e
+        kwargs = self._validate_kwargs(kwargs)
 
         result = self.func(*args, **kwargs)