[BUG] Terminal scrolling becomes unresponsive when TodoWrite task list gets very long

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?

When using the TodoWrite tool to create long task lists, the terminal interface becomes glitchy and prevents normal scrolling functionality, making it difficult to review previous conversation history.

This significantly impacts usability when working on complex multi-step tasks that require task tracking, as users lose the ability to scroll through conversation history.

Workarounds:

• Keep task lists shorter or complete/clear tasks more frequently to avoid the issue.
• Ask Claude to track long task lists directly from CLAUDE.md and not show them in the terminal.

What Should Happen?

Terminal should allow normal scrolling regardless of task list length displayed in the UI.

Error Messages/Logs

Steps to Reproduce

1. Use Claude Code with TodoWrite tool to create a long task list (10+ items)
2. Try to scroll up in the terminal window to view previous output
3. Observe that scrolling becomes unresponsive or glitchy

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.0.128

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_