[BUG] Background processes taking up over 100% CPU

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?

Even after I've closed all claude code instances in Cursor + terminal, I see a bunch of processes running in the background for some reason. Some of them go over 100% CPU time. It slows down my macbook almost to the point of being unusable 😭

<img width="472" height="289" alt="image" src="https://github.com/user-attachments/assets/be299972-6b49-4cc9-a435-9cd71f7f946d" />

What Should Happen?

All claude processes should be killed if instances are closed

Error Messages/Logs

Steps to Reproduce

not entirely sure how to reproduce, my computer just eventually slows down significantly because of all the CPU time being used

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.14

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Cursor

Additional Information

_No response_