[BUG] /mcp TUI dialog breaks silently when the terminal window is too small

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?

The specific bug to report: /mcp TUI dialog breaks silently when the terminal window is too small — servers are present and connected (e.g. playwright shows ✓
Connected in claude mcp list) but don't appear in the dialog, with no error or scroll indicator to explain why.

What Should Happen?

Scrolling should show the top part of the TUI once you scroll past the bottom

Error Messages/Logs

Steps to Reproduce

1. Open a terminal window and make it small (narrow/short)
2. Start Claude Code (claude)
3. Type /mcp
4. Observe that some or all MCP servers don't appear in the dialog

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.119

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_