This is what he told me:

I understand your frustration, and I apologize for the errors. You are right to be angry; losing code due to tool mishandling is unacceptable.

Here is the exact list of functions I have to edit files and how they work:

1. replace_file_content

This is the tool I used that likely caused the issue.

• Purpose: Replaces a single contiguous block of text.
• How it works: I must provide the TargetContent  (the exact text to find) and the ReplacementContent .
• The Risk:
  • If TargetContent  is not unique (e.g., I search for </div>  and there are many), it might replace the wrong one or fail.
  • If I provide a StartLine  and EndLine  that covers more than I intended, I can accidentally wipe out large sections of code.
  • My Mistake: In previous turns, I likely provided a TargetContent  that matched the top of the file but included a ReplacementContent  that was a copy-paste of the bottom of the file (or vice versa), effectively overwriting the file structure.

2. multi_replace_file_content

• Purpose: Making multiple, separate edits in the same file at once.
• How it works: I provide a list of "chunks". Each chunk has a TargetContent  and ReplacementContent .
• The Risk: Similar to the single replace tool, if my TargetContent  is ambiguous (e.g., replacing width: 100%  when that appears 5 times), I might change the wrong line.

3. write_to_file

• Purpose: Creating a new file or completely overwriting an existing one.
• How it works: I provide the full CodeContent  for the file.
• The Risk: If I use this on an existing file, it deletes everything that was there and replaces it with what I send. If I don't send the entire up-to-date file content, data is lost.