PHPStorm IDE integration not working on native Windows - /ide shows "No available IDEs detected" despite SSE port being set

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?

The Claude Code JetBrains plugin fails to establish IDE integration on native Windows. The /ide command shows "No available IDEs detected" even though:

1. The plugin is installed and enabled
2. CLAUDE_CODE_SSE_PORT environment variable is correctly set in the terminal (e.g., 51849)
3. The SSE port is listening and accessible (verified with Test-NetConnection)
4. Running from PHPStorm's integrated terminal

The diff viewer does not open when Claude makes file edits - changes only appear in the terminal.

What Should Happen?

• /ide command should detect PHPStorm as an available IDE
• File edits should open in PHPStorm's native diff viewer
• IDE integration features (selection context, diagnostics sharing) should work

Error Messages/Logs

claude doctor output:
Diagnostics
└ Currently running: native (2.1.25)
└ Path: C:\Users\dave\.local\bin\claude.exe
└ Config install method: native
└ Search: OK (bundled)

Updates
└ Auto-updates: enabled
└ Auto-update channel: latest
└ Stable version: 2.1.7
└ Latest version: 2.1.25

Steps to Reproduce

1. Install Claude Code CLI natively on Windows (C:\Users\<user>\.local\bin\claude.exe)
2. Install Claude Code [Beta] plugin from JetBrains Marketplace in PHPStorm
3. Restart PHPStorm
4. Open a new integrated terminal
5. Verify SSE port is set: echo $env:CLAUDE_CODE_SSE_PORT (shows port number)
6. Verify port is listening: Test-NetConnection -ComputerName localhost -Port <port> (TcpTestSucceeded: True)
7. Run claude
8. Run /ide command
9. Observe: "No available IDEs detected"
10. Ask Claude to edit a file
11. Observe: No diff viewer opens, changes shown in terminal only

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Same versions worked this morning

Claude Code Version

Claude Code CLI version: 2.1.25 (native installation)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Environment
• Platform: Anthropic API (Claude Max)
• Claude Code CLI version: 2.1.25 (native installation)
• Operating System: Windows 11 Pro (Build 26200)
• IDE: PHPStorm 2025.3.2
• Plugin version: Claude Code [Beta] 0.1.14-beta
• Terminal: PowerShell (PHPStorm integrated terminal)
• Environment type: Native Windows (NOT WSL)
Additional Context
• Previously encountered ClassCastException in plugin (resolved by clearing caches):
• java.lang.ClassCastException: class com.anthropic.code.plugin.settings.PluginSettings cannot be cast to class com.anthropic.code.plugin.settings.PluginSettings
• claude doctor shows healthy installation with native method
• Port connectivity verified - SSE server is running and accessible
• This is NOT a WSL issue - running entirely native Windows
Related Issues
• #14037 - Windows IDE integration PHPstorm (similar symptoms, WSL)
• #18277 - /ide command doesn't detect JetBrains IDE when running inside IDE terminal
• #14489 - IDE detection fails on Windows
• #1232 - Claude Code does not detect Jetbrains IDE on Windows WSL