[BUG] IDE integration not working on Windows with WebStorm and Git 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?

Claude Code does not connect to the WebStorm IDE plugin on Windows, even though the environment variables are correctly set and the SSE port is listening.

Environment:

• OS: Windows 10/11 (MINGW64_NT-10.0-26200)
• Claude Code version: 2.1.29 (native install via curl -fsSL https://claude.ai/install.cmd)
• IDE: WebStorm 2025.3.1
• Terminal: Git Bash (configured as WebStorm's integrated terminal)
• Claude Code JetBrains plugin: Beta (latest version)

What Should Happen?

Claude Code should detect the IDE and connect via SSE. The /ide command should show WebStorm as available, and file diffs should appear in the IDE.

Error Messages/Logs

WebStorm idea.log shows the terminal starts correctly with the environment variables:                                                                                                                                                    
  LocalTerminalDirectRunner - Started com.pty4j.windows.conpty.WinConPtyProcess from [C:\Program Files\Git\bin\bash.exe] with diff_envs={CLAUDE_CODE_SSE_PORT=50789, ENABLE_IDE_INTEGRATION=true, ...}

Steps to Reproduce

1. Install Claude Code via the official Windows installer
2. Install the Claude Code [Beta] plugin in WebStorm
3. Configure WebStorm terminal to use Git Bash
4. Launch Claude Code from WebStorm's integrated terminal

Claude Model

Other

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.29

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

This setup was working previously. The issue appeared after an update (unsure if Claude Code or plugin update).