[BUG]

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?

Root cause analysis:
Claude Code's internal tools are hardcoded to use cygpath for path conversion on Windows. When cygpath is not available or not in the PATH of the subprocess, ALL tools fail. This is a critical bug because:

1. cygpath is a Cygwin-specific utility, not available in standard Git Bash or WSL
2. Even when installed, the PATH may not propagate correctly to Claude Code's subprocesses
3. There's no fallback mechanism when cygpath is unavailable
4. The error affects ALL tools, making Claude Code completely unusable

Suggested fix:

• Implement path conversion without requiring cygpath
• Add fallback mechanism when cygpath is not available
• Use Node.js built-in path utilities instead of external commands
• Detect Windows environment and use appropriate path handling

Impact:
CRITICAL - Claude Code is completely non-functional. No tools work at all.

Workaround:
None found. Manual copy-paste is the only option.

What Should Happen?

Root cause analysis:
Claude Code's internal tools are hardcoded to use cygpath for path conversion on Windows. When cygpath is not available or not in the PATH of the subprocess, ALL tools fail. This is a critical bug because:

1. cygpath is a Cygwin-specific utility, not available in standard Git Bash or WSL
2. Even when installed, the PATH may not propagate correctly to Claude Code's subprocesses
3. There's no fallback mechanism when cygpath is unavailable
4. The error affects ALL tools, making Claude Code completely unusable

Suggested fix:

• Implement path conversion without requiring cygpath
• Add fallback mechanism when cygpath is not available
• Use Node.js built-in path utilities instead of external commands
• Detect Windows environment and use appropriate path handling

Impact:
CRITICAL - Claude Code is completely non-functional. No tools work at all.

Workaround:
None found. Manual copy-paste is the only option.

Error Messages/Logs

Steps to Reproduce

Root cause analysis:
Claude Code's internal tools are hardcoded to use cygpath for path conversion on Windows. When cygpath is not available or not in the PATH of the subprocess, ALL tools fail. This is a critical bug because:

1. cygpath is a Cygwin-specific utility, not available in standard Git Bash or WSL
2. Even when installed, the PATH may not propagate correctly to Claude Code's subprocesses
3. There's no fallback mechanism when cygpath is unavailable
4. The error affects ALL tools, making Claude Code completely unusable

Suggested fix:

• Implement path conversion without requiring cygpath
• Add fallback mechanism when cygpath is not available
• Use Node.js built-in path utilities instead of external commands
• Detect Windows environment and use appropriate path handling

Impact:
CRITICAL - Claude Code is completely non-functional. No tools work at all.

Workaround:
None found. Manual copy-paste is the only option.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.0.67

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Root cause analysis:
Claude Code's internal tools are hardcoded to use cygpath for path conversion on Windows. When cygpath is not available or not in the PATH of the subprocess, ALL tools fail. This is a critical bug because:

1. cygpath is a Cygwin-specific utility, not available in standard Git Bash or WSL
2. Even when installed, the PATH may not propagate correctly to Claude Code's subprocesses
3. There's no fallback mechanism when cygpath is unavailable
4. The error affects ALL tools, making Claude Code completely unusable

Suggested fix:

• Implement path conversion without requiring cygpath
• Add fallback mechanism when cygpath is not available
• Use Node.js built-in path utilities instead of external commands
• Detect Windows environment and use appropriate path handling

Impact:
CRITICAL - Claude Code is completely non-functional. No tools work at all.

Workaround:
None found. Manual copy-paste is the only option.