Describe the Bug
Sometimes (for now I just saw it using “Claude 4 Sonnet Thinking”) the chat agent is stuck in a loop, repeating the same 1-2 actions over and over.
At the same time, when having the chat open in the sidebar where this behaviour can be observed, there is a massive performance drop, to a point where the interaction with the whole Cursor UI is heavily lagging and popovers take a couple of seconds to open.
As soon as I move to a new chat, the performance drop is gone immediately.
Steps to Reproduce
Because of the nature of the bug I don’t know how to reproduce it but I can provide these request IDs where I saw the behaviour:
4b811009-21a0-4d22-88e4-7476a9ef7022
e9231530-e8da-4c9a-adde-ff9e45e929dd
Expected Behavior
- The agent should be executing proper actions and not repeat itself
- The performance should not be impacted by a failing agent
Operating System
MacOS
Current Cursor Version (Menu → About Cursor → Copy)
Version: 1.2.1
VSCode Version: 1.99.3
Commit: 031e7e0ff1e2eda9c1a0f5df67d44053b059c5d0
Date: 2025-07-03T06:06:37.704Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.5.0
Does this stop you from using Cursor
Sometimes - I can sometimes use Cursor