[BUG] Error editing file

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?

<img width="494" height="696" alt="Image" src="https://github.com/user-attachments/assets/3f25c0c5-0c69-4e80-94db-7ac86ce20ddc" />

What Should Happen?

Claude code should be able to edit files without problem.

Error Messages/Logs

Error: InputValidationError: Edit failed due to the following issue:
The required parameter `new_string` is missing

Steps to Reproduce

Ask claude code to execute any tasks that require to edit files

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Version 2.0.45

Claude Code Version

Version 2.0.46

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_