```diff
--- test_files/296-original.txt	2025-03-07 19:06:44
+++ test_files/296-modified.txt	2025-03-07 19:06:44
@@ -47,7 +47,7 @@
     """Response from text editor operations."""
 
     output: str = Field(..., description="The output of the operation")
-    error: str = Field(default=None, description="Error message, if any")
+    error: t.Optional[str] = Field(default=None, description="Error message, if any")
 
 
 class TextEditor(LocalAction[TextEditorRequest, TextEditorResponse]):
```
