write, edit, and apply_patch now report the first syntax-error line when they create a file that doesn't parse, telling the agent the new file was written as given. Existing files still roll back as before, and new Swift files that swiftc -parse accepts get no notice.
apply_patch tracks created files and checks each one's final content once after all hunks, so later hunks that fix, break, move, or delete a new file update or remove the notice and metadata.files.syntax_error_line accordingly.
The notice appears directly under the reply line that created the file, and broken new files are never rolled back.
apply_patch metadata relative paths now resolve through root aliases (Unix symlink roots and Windows short names), including for files that a hunk deleted or moved away; the Windows alias test skips volumes where 8.3 short names are disabled.
Confidence Score: 5/5
The PR appears safe to merge; no actionable issues remain.
Summary
Adds first-error-line notices when write, edit, or apply_patch creates a file that does not parse.
New broken files point to their first syntax-error line.
Patch metadata keeps deleted-file paths relative under aliased roots.
Diagram
%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Write or patch a file] --> B{Created by this call?}
B -- No --> C[Keep existing syntax checks and rollback]
B -- Yes --> D[Keep the new content]
D --> E[Read final content]
E --> F{Parse error remains?}
F -- No --> G[Return without a syntax notice]
F -- Yes --> H[Return first error line and notice]
