[BUG] Hook SubagentStop triggers on claude code start

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?

SubagentStop-Hook gets triggered when claude-code starts in terminal.

What Should Happen?

According the documentation, the hook should only be fired by ending a subagent.

Error Messages/Logs

Steps to Reproduce

Start claude code in vscode terminal

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.20

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_