Terminal freezes when pasting long text in Cursor's integrated terminal

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 pasting long text into Claude Code's interactive session in Cursor's integrated terminal (xterm.js based), the terminal freezes completely. Ctrl+C stops responding and no keyboard input is accepted.

What Should Happen?

Text is pasted and accepted normally.

Error Messages/Logs

Steps to Reproduce

1. Start an interactive Claude Code session
2. Copy a long text (500+ characters)
3. Paste with Cmd+V into the Claude Code prompt

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

latest

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Cursor

Additional Information

Possible cause

Large paste operations flood the PTY buffer all at once, overwhelming Claude Code's input handler.