[BUG] Claude Code is trying to call cygpath internally but failing, even though cygpath works fine from bash.

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?

• OS: Windows 10.0.22631 with Cygwin 3.6.4
• Claude Code version: 2.0.11
• The error: Command failed: cygpath -u 'C:\Users\kwright\AppData\Local\Temp'
• That cygpath works fine in bash but fails when Claude Code calls it internally

cygpath works perfectly even in non-interactive mode (bash -c), and the PATH is correctly set. This
confirms the issue is specifically with how Claude Code is launching bash or handling the environment.

This appears to be a bug in Claude Code v2.0.11 on Windows/Cygwin. The issue is that Claude Code is trying to call cygpath internally but failing

CLAUDE - Claude Code is trying to call cygpath internally but failing.txt

, even though cygpath works fine from bash.

What Should Happen?

Claude should not be erroring this way.

Error Messages/Logs

Steps to Reproduce

Fresh Claude and cygwin install.
Please see uploaded file for the complete Claude session.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.11

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Same results in Windows 'cmd' terminal.