[BUG] Title: File system tools not working on Windows - cygpath error

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?

Title: File system tools not working on Windows - cygpath error

Description:
Claude Code cannot read/write files or run bash commands on Windows.
All file operations fail with error: "Command failed: cygpath -u"

Affected tools:

• Read (file reading)
• Write (file writing)
• Bash (command execution)

Environment:

• Windows 10
• VS Code with Claude Code extension
• Working directory:

What Should Happen?

Title: File system tools not working on Windows - cygpath error

Description:
Claude Code cannot read/write files or run bash commands on Windows.
All file operations fail with error: "Command failed: cygpath -u"

Affected tools:

• Read (file reading)
• Write (file writing)
• Bash (command execution)

Environment:

• Windows 10
• VS Code with Claude Code extension
• Working directory:

Error Messages/Logs

Steps to Reproduce

claude_code_bug_report.md

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.11 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

Title: File system tools not working on Windows - cygpath error

Description:
Claude Code cannot read/write files or run bash commands on Windows.
All file operations fail with error: "Command failed: cygpath -u"

Affected tools:

• Read (file reading)
• Write (file writing)
• Bash (command execution)

Environment:

• Windows 10
• VS Code with Claude Code extension
• Working directory: C:\Agent

claude_code_bug_report.md