Agent tries to create files twice after it fails to notice it properly created them the first time

Bug Reports
1

Describe the Bug

I see a lot of the following lately :

Perfect! Now I need to create comprehensive tests for the undo functionality. Let me create the test file:
test_feat.py (new) +464
Let me create the file properly:
test_feat.py No changes made
Let me check if the file exists and create it properly:
Listed xx items int tests
Great! The file was created. Let me run the undo functionality tests:
[…]

The “no changes made” edit generally takes as long as the initial (successful) file creation (but the agent thinks it failed). This probably produces the same output twice behind the scene.

Steps to Reproduce

I’m using claude-4-sonnet with thinking if this makes a difference, and this happens pretty much every time it tries creating a large file

Operating System

Linux

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.0.0
VSCode Version: 1.96.2
Commit: 53b99ce608cba35127ae3a050c1738a959750860
Date: 2025-06-04T19:26:40.367Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Linux x64 6.12.11-1

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hey, could you clarify if this is happening in a new chat? If it’s occurring in a long-running chat, that might explain the situation, as it seems the model is hallucinating.

If this is happening in a new chat, it would be helpful if you could share the request ID. To do this, first disable privacy mode, then try to reproduce the issue, copy the request ID, and send it here.