[BUG] Ultraplan issue: API Error - Stream idle timeout - partial response received

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?

This message appeared when I used ultraplan:
Let me write the plan file.
API Error: Stream idle timeout - partial response received

What Should Happen?

At least it should show me the final plan instead.

Error Messages/Logs

Steps to Reproduce

Just used /ultraplan

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.107

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_