[BUG] Claude Code CLI crashes on Windows with "cygpath: command not found" 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?

After updating Claude Code CLI today (2025-09-30), the CLI immediately crashes when run from CMD/PowerShell on Windows with the error:
ERROR Command failed: cygpath -u 'H:\SpaceCraft_java'
/usr/bin/bash: line 1: cygpath: command not found

What Should Happen?

read or list files

Error Messages/Logs

ERROR  Command failed: cygpath -u 'H:\SpaceCraft_java'
        /usr/bin/bash: line 1: cygpath: command not found


 - /usr/bin/bash: line 1: cygpath: command not found

Steps to Reproduce

any read in my project, running claude from main disk level had no issues but running from project folder crashed every time

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

claude-sonnet-4-5-20250929

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

vs code had no issue.