[BUG] Shift+Enter executes prompt instead of creating new line

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 Claude Code in the terminal, pressing Shift+Enter executes the prompt instead of creating a new line.

This makes it difficult to write multi-line prompts or code in the CLI.

What Should Happen?

Shift+Enter should create a new line in the prompt input, allowing users to write multi-line prompts. Enter should execute the prompt.

Error Messages/Logs

Steps to Reproduce

1. Open terminal (CMD or Git Bash on Windows)
2. Run claude
3. Start typing a prompt
4. Press Shift+Enter to try to create a new line
5. Instead of new line, the prompt is executed

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.19

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_