Bug - /btw is suggested by not supported

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?

Claude suggested /btw as a non-interrupting message
command — this command doesn't exist.

What Should Happen?

Claude said this is a way to provide more context or ask questiosn.

Error Messages/Logs

Claude says that this is not a valid command.

Steps to Reproduce

Ask claude to design a system..

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Version: 2.1.73

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_