Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
Running Plan mode, with the following prompt
I want to support scikit-learn API in my package. Create new submodule in the package . Also write the compatiblity tests.
spins up a subagent(?) that is stuck in a loop and burns through my tokens.
Steps to Reproduce
Input the prompt to fresh planning mode chat
Expected Behavior
The regular planning mode’s expected behavior.
Screenshots / Screen Recordings
Operating System
MacOS
Current Cursor Version (Menu → About Cursor → Copy)
Version: 2.4.7
VSCode Version: 1.105.1
Commit: ca0f9bf806f235ea014a22712cbcbf5e88ca77e0
Date: 2026-01-20T20:52:38.077Z
Build Type: Stable
Release Track: Early Access
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 24.6.0
For AI issues: which model did you use?
Tried Opus 4.5, GPT 5.2 Codex, Gemini 3 Flash
Does this stop you from using Cursor
Yes - Cursor is unusable
deanrie
(Dean Rie)
3
Hey, thanks for the report.
I can see the issue: the subagent “Explore gemss codebase for scikit-learn API integration” got stuck in a loop, endlessly repeating:
</think>
Reviewing key files to understand the current API.
This looks like a bug with parsing the thinking tags. The model can’t properly exit the “think” block and ends up looping.
If you can, please send the Request ID (chat menu > Copy Request ID). It’ll help with debugging.
Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
Agent is just doing this weird thinking thing over and over. However if I switch to Opus it is all working fine.
Steps to Reproduce
Just try to use agent mode in any chat with composer 1 as the model
Expected Behavior
Work as normal doing planning, tool calls, etc..
Screenshots / Screen Recordings
Operating System
MacOS
Version Information
Version: 2.4.21
VSCode Version: 1.105.1
Commit: dc8361355d709f306d5159635a677a571b277bc0
Date: 2026-01-22T16:57:59.675Z
Build Type: Stable
Release Track: Early Access
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 24.6.0
For AI issues: which model did you use?
composer 1
For AI issues: add Request ID with privacy disabled
97743c41-a80c-4fd3-888a-f39e5098df00
Does this stop you from using Cursor
No - Cursor works, but with this issue
condor
(Condor (Tee))
7
hi @Curtis_Renkiewicz and welcome to Cursor Forum. Thank you for your detailed bug report.
We are already aware of this issue and a fix is on the way.
Jair_Lomas
(Jair Lomas)
8
Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
When I use ASK agent mode, I ask for something and cursor get stuck in loop.
Steps to Reproduce
Select code.
Switch to ask agent mode.
Describe instructions.
Enter.
Screenshots / Screen Recordings
Operating System
MacOS
Current Cursor Version (Menu → About Cursor → Copy)
Version: 2.3.41 (Universal)
VSCode Version: 1.105.1
Commit: 2ca326e0d1ce10956aea33d54c0e2d8c13c58a30
Date: 2026-01-16T19:14:00.150Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.6.0
Does this stop you from using Cursor
Sometimes - I can sometimes use Cursor
Freshman
(Heartruler)
10
Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
When I use ASK agent mode, I ask for something and cursor get stuck in loop. Btw, plan mode also has this problem.
Steps to Reproduce
Select code.
Switch to ask agent mode.
Describe instructions.
Enter.
**Screenshots / Screen Recordings
(ASK Mode) Although it is Chinese, you can obviously find that it is a loop cause Cursor keep answering the same words.
Operating System**
windows10
Current Cursor Version (Menu → About Cursor → Copy)
Version: 2.4.21 (system setup)
VSCode Version: 1.105.1
Commit: dc8361355d709f306d5159635a677a571b277bc0
Date: 2026-01-22T16:57:59.675Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.19045
For AI issues: which model did you use?
composer 1
For AI issues: add Request ID with privacy disabled
16b9dfd5-3b03-4387-ac46-4fd7d0e657c6
Does this stop you from using Cursor
Yes, this stupid thinking loop stocks Cursor.
