Error Editing Files. Cursor cannot edit files.

Describe the Bug

The screenshot shows me using different models one after another. They all end with an error.
They generate a chat response, but each one reports an inability to edit files. So none of them successfully completes the task.
Finally, I turn on the Claude 4 Sonnet and it works immediately.
All the instructions are identical: copy and paste.
So why can’t the other three models perform simple .php file editing? But the Claude Sonnet 4 suddenly can?

Steps to Reproduce

The prompts sent for various models randomly cause editing errors. They cannot be edited; they can only be read. Despite using the main agent without any file editing restrictions, of course.

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.2.4 (user setup)
VSCode Version: 1.99.3
Commit: a8e95743c5268be73767c46944a71f4465d05c90
Date: 2025-07-10T17:09:01.383Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

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