Fix #3149: Add missing create_directory parameter to Task class (#3150)

* Fix #3149: Add missing create_directory parameter to Task class

- Add create_directory field with default value True for backward compatibility
- Update _save_file method to respect create_directory parameter
- Add comprehensive tests covering all scenarios
- Maintain existing behavior when create_directory=True (default)

The create_directory parameter was documented but missing from implementation.
Users can now control directory creation behavior:
- create_directory=True (default): Creates directories if they don't exist
- create_directory=False: Raises RuntimeError if directory doesn't exist

Fixes issue where users got TypeError when trying to use the documented
create_directory parameter.

Co-Authored-By: Jo\u00E3o <joao@crewai.com>

* Fix lint: Remove unused import os from test_create_directory_true

- Removes F401 lint error: 'os' imported but unused
- All lint checks should now pass

Co-Authored-By: Jo\u00E3o <joao@crewai.com>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Jo\u00E3o <joao@crewai.com>

src/crewai/task.py

@@ -67,6 +67,7 @@ class Task(BaseModel):
         description: Descriptive text detailing task's purpose and execution.
         expected_output: Clear definition of expected task outcome.
         output_file: File path for storing task output.
+        create_directory: Whether to create the directory for output_file if it doesn't exist.
         output_json: Pydantic model for structuring JSON output.
         output_pydantic: Pydantic model for task output.
         security_config: Security configuration including fingerprinting.
@@ -115,6 +116,10 @@ class Task(BaseModel):
         description="A file path to be used to create a file output.",
         default=None,
     )
+    create_directory: Optional[bool] = Field(
+        description="Whether to create the directory for output_file if it doesn't exist.",
+        default=True,
+    )
     output: Optional[TaskOutput] = Field(
         description="Task output, it's final result after being executed", default=None
     )
@@ -753,8 +758,10 @@ Follow these guidelines:
             resolved_path = Path(self.output_file).expanduser().resolve()
             directory = resolved_path.parent
 
-            if not directory.exists():
+            if self.create_directory and not directory.exists():
                 directory.mkdir(parents=True, exist_ok=True)
+            elif not self.create_directory and not directory.exists():
+                raise RuntimeError(f"Directory {directory} does not exist and create_directory is False")
 
             with resolved_path.open("w", encoding="utf-8") as file:
                 if isinstance(result, dict):