[BUG] Edit Tool Modifies File CreationTime on Windows Powershell, Breaking Timestamp-Based UUID Systems

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Environment: Windows 10, Claude Code + Claudian integration with Obsidian vault

When using Claude Code's Edit tool to modify files on Windows, the file's CreationTime (file creation timestamp) is unexpectedly updated to the current time instead of preserving the original creation timestamp.

What Should Happen?

The Edit tool should preserve the original file creation timestamp, only updating LastWriteTime and LastAccessTime.

Error Messages/Logs

Steps to Reproduce

1. Set up test environment:

• Windows 10 system, Powershell 7
• Create a test directory: mkdir test-timestamp && cd test-timestamp
• Create a simple test file: echo "Original content" > test-file.md

1. Record original creation time:

powershell -Command "(Get-Item 'test-file.md').CreationTime.ToString('yyyy-MM-dd HH:mm:ss.fff')"
Example output: 2026-01-21 22:40:58.495

1. Use Claude Code Edit tool:

• Via Claude Code interface or command, edit the file content
• Example edit: Change "Original content" to "Modified content"

1. Check creation time after edit:

powershell -Command "(Get-Item 'test-file.md').CreationTime.ToString('yyyy-MM-dd HH:mm:ss.fff')"
Example output: 2026-01-21 22:43:09.123 (DIFFERENT from original!)

1. Verify all timestamps changed:

powershell -Command "$f = Get-Item 'test-file.md'; $f | Format-List CreationTime, LastWriteTime, LastAccessTime"
Output shows all three timestamps are now identical (should only have LastWriteTime updated)

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

2.1.14

Claude Code Version

2.1.14

Platform

Other

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_