IDE detection fails on Windows - /ide shows no available IDEs

Description

The /ide command shows "No available IDEs detected" even though the Claude Code extension is installed and enabled in both VS Code and Cursor.

Environment

• OS: Windows (MINGW64_NT-10.0-26200)
• Claude Code CLI: v2.0.72 (npm-global)
• IDEs tested: VS Code and Cursor (both have Claude Code extension installed)
• Terminal: Running from IDE integrated terminal

Steps to Reproduce

1. Install Claude Code extension in VS Code/Cursor
2. Open IDE and verify extension is installed and enabled
3. Open integrated terminal in the IDE
4. Run claude
5. Run /ide

Expected Behavior

The IDE should be detected and listed as available for connection.

Actual Behavior

Shows: "No available IDEs detected. Make sure your IDE has the Claude Code extension or plugin installed and is running."

Troubleshooting Attempted

• Verified extension is installed and enabled in both IDEs
• Set "Claude Process Wrapper" setting to C:\Users\lesli\AppData\Roaming\npm\claude.cmd
• Added Cursor to Windows PATH
• Added firewall rule for ports 42000-44999
• Reinstalled extension
• Restarted IDEs multiple times
• Ran claude doctor - shows no issues

Extension Logs

The VS Code Output panel for Claude Code shows HTTP client errors:

2025-12-18T15:47:21.048Z [ERROR] "Error: Error\n    at <anonymous> (B:/~BUN/root/claude.exe:45:15236)\n    at <anonymous> (B:/~BUN/root/claude.exe:59:10263)\n    at emitError (node:events:43:23)\n    ...

Additional Context

• claude doctor output shows installation is healthy
• No IDE lock files are being created in ~/.claude/
• No ports in the 42000-44000 range are listening when checked with netstat
• The extension appears to not be starting its WebSocket server