claude-code - 💡(How to fix) Fix [BUG] Edit tool silently clears file to 0 bytes on Windows [2 comments, 2 participants]

The Edit tool reported "updated successfully" but actually wrote 0 bytes to the file, completely erasing its content. No error was thrown. The Edit tool should correctly apply the edit and preserve existing file content. If an error occurs, it should report the error instead of silently zeroing

Error Messages/Logs

TL;DR

The Edit tool in Claude Code may be experiencing an intermittent issue where it silently overwrites files with empty content, potentially due to encoding or concurrent access issues.

Guidance

• Verify the file encoding and line endings to ensure consistency, as the issue might be related to Windows CRLF/LF encoding edge cases.
• Check for any concurrent file access or modifications during the editing process, as this could be a contributing factor to the issue.
• Test the Edit tool with a small, controlled modification to see if the issue can be reliably reproduced, focusing on the steps to reproduce provided.
• Consider enabling detailed logging or debugging to capture any potential error messages that might not be visible through the standard interface.

Example

No specific code snippet can be provided without further details on the Claude Code internals, but ensuring that file handling and editing operations are properly synchronized and encoded could be crucial.

Notes

The intermittent nature of the issue and the lack of explicit error messages make it challenging to pinpoint the exact cause. Further investigation into the Claude Code's file handling and editing mechanisms, as well as the specific environment and usage patterns, is necessary.

Recommendation

Apply workaround: Until the root cause is identified and fixed, users might need to manually verify file contents after using the Edit tool, especially in environments where concurrent file access is possible or when working with files that have specific encoding requirements.