[BUG] SubagentStop hook fires on main session/agent

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 have a hook for Stop and SubagentStop. On Stop for the main session, not subagents have been spawned, it runs both the Stop and SubagentStop hook.

What Should Happen?

Only the stop hook should fire on the main session

Error Messages/Logs

Steps to Reproduce

1. Create a test file that can print the event
2. Add Stop and SubagentStop hooks to Claude Code settings
3. Run something and look at events

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.178

Claude Code Version

2.1.186 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_