Allow Claude to stop background agents.

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?

[BUG ]You need to provide a mechanism for stopping background agents. I had 5 agents running background processes that were continuously fighting over the same file to write to it. One would have it locked, the rest would retry. I recognized what was happening and asked Claude shutdown the agents. Claude informed me it couldn't. Over the next 15 minutes, my token usage went from about 20% to 100%. And there was nothing I could do to stop it. This has happened twice now. Not good!

What Should Happen?

When I instruct Claude to stop background processes it has the ability to do so.

Error Messages/Logs

Steps to Reproduce

Start a process that manipulates a file on your local drive. Allow 5 agents to write to it at the same time.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

12345

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_