[BUG] Hook .sh scripts open in VSCode instead of executing on Windows Terminal/PowerShell

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?

I installed a plugin with a startup hook, specified as:

{
  "type": "command",
  "command": "${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh"
}

When I start claude from the Windows Terminal, a VSCode window opens with the session-start.sh file, and the only output I get in the terminal is like:

[main 2025-10-17T18:19:45.366Z] update#setState idle
[main 2025-10-17T18:20:15.378Z] update#setState checking for updates
[main 2025-10-17T18:20:15.501Z] update#setState idle

When I close the VSCode window, then Claude Code's splash screen finally displays back in the terminal.

What Should Happen?

Claude Code should execute the .sh script.

Error Messages/Logs

Steps to Reproduce

1. On Windows, open the Windows Terminal and a PowerShell tab
2. Run Claude Code (claude) and install a plugin with a hook, like obra/superpowers
3. Restart Claude Code to have the plugin take effect
4. Observe that a VSCode opens and the plugin script does not run

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.21

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_