[BUG] Claude Code constructs invalid bash.exe path on Windows: usr\bin\..\usr\bin\bash.exe

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

• OS: Windows 10/11
• Git version: 2.54.0.windows.1
• Claude Code version: 2.1.89
• bash.exe locations:

C:\Program Files\Git\bin\bash.exe
C:\Program Files\Git\usr\bin\bash.exe

Problem

Claude Code constructs an invalid bash path:
C:\Program Files\Git\usr\bin\..\usr\bin\bash.exe

This path does not exist and causes all Bash tool calls to fail.

Expected

Claude Code should use:
C:\Program Files\Git\usr\bin\bash.exe
OR
C:\Program Files\Git\bin\bash.exe

Workaround

Running deploy.ps1 manually in PowerShell works correctly.
Setting CLAUDE_CODE_GIT_BASH_PATH environment variable does NOT fix the issue.
The settings.json env variable is also ignored.

Impact

All Bash tool commands fail. Claude Code cannot automate deployments on Windows.

What Should Happen?

Environment

• OS: Windows 10/11
• Git version: 2.54.0.windows.1
• Claude Code version: 2.1.89
• bash.exe locations:

C:\Program Files\Git\bin\bash.exe
C:\Program Files\Git\usr\bin\bash.exe

Problem

Claude Code constructs an invalid bash path:
C:\Program Files\Git\usr\bin\..\usr\bin\bash.exe

This path does not exist and causes all Bash tool calls to fail.

Expected

Claude Code should use:
C:\Program Files\Git\usr\bin\bash.exe
OR
C:\Program Files\Git\bin\bash.exe

Workaround

Running deploy.ps1 manually in PowerShell works correctly.
Setting CLAUDE_CODE_GIT_BASH_PATH environment variable does NOT fix the issue.
The settings.json env variable is also ignored.

Impact

All Bash tool commands fail. Claude Code cannot automate deployments on Windows.

Error Messages/Logs

## Environment
- OS: Windows 10/11
- Git version: 2.54.0.windows.1
- Claude Code version: 2.1.89
- bash.exe locations:
  C:\Program Files\Git\bin\bash.exe
  C:\Program Files\Git\usr\bin\bash.exe

## Problem
Claude Code constructs an invalid bash path:
C:\Program Files\Git\usr\bin\..\usr\bin\bash.exe

This path does not exist and causes all Bash tool calls to fail.

## Expected
Claude Code should use:
C:\Program Files\Git\usr\bin\bash.exe
OR
C:\Program Files\Git\bin\bash.exe

## Workaround
Running deploy.ps1 manually in PowerShell works correctly.
Setting CLAUDE_CODE_GIT_BASH_PATH environment variable does NOT fix the issue.
The settings.json env variable is also ignored.

## Impact
All Bash tool commands fail. Claude Code cannot automate deployments on Windows.

Steps to Reproduce

Environment

• OS: Windows 10/11
• Git version: 2.54.0.windows.1
• Claude Code version: 2.1.89
• bash.exe locations:

C:\Program Files\Git\bin\bash.exe
C:\Program Files\Git\usr\bin\bash.exe

Problem

Claude Code constructs an invalid bash path:
C:\Program Files\Git\usr\bin\..\usr\bin\bash.exe

This path does not exist and causes all Bash tool calls to fail.

Expected

Claude Code should use:
C:\Program Files\Git\usr\bin\bash.exe
OR
C:\Program Files\Git\bin\bash.exe

Workaround

Running deploy.ps1 manually in PowerShell works correctly.
Setting CLAUDE_CODE_GIT_BASH_PATH environment variable does NOT fix the issue.
The settings.json env variable is also ignored.

Impact

All Bash tool commands fail. Claude Code cannot automate deployments on Windows.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

• Model: Claude Sonnet 4.6 - Model ID: claude-sonnet-4-6 - Platform: Claude Code CLI (desktop app, Windows 10 Pro 10.0.19045)

Claude Code Version

• Model: Claude Sonnet 4.6 - Model ID: claude-sonnet-4-6 - Platform: Claude Code CLI (desktop app, Windows 10 Pro 10.0.19045)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

• Model: Claude Sonnet 4.6
• Model ID: claude-sonnet-4-6
• Platform: Claude Code CLI (desktop app, Windows 10 Pro 10.0.19045)