[BUG]

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 Cowork is not working. says: t.filter is not a function

<img width="886" height="319" alt="Image" src="https://github.com/user-attachments/assets/bec68511-610d-4c0c-899a-93cbb5eb373c" />

What Should Happen?

Unable to login in Claude Cowork, t.filter is not a function

Error Messages/Logs

Steps to Reproduce

I had logged into Claude Cowork and given new task and once press enter "t.filter" is not a function.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

4.6

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_