Describe the Bug
During and agent request, twice now the agent is only editing a small part of a large file and ends up showing a full file edit and replace (in this case +6766 lines -6747 lines). When only a couple lines should have been replaced.
Both times it has happened while I have a different file open and am reading through that other file.
The first time, the agent response didn’t finish loading and the UI was super laggy and unusable. Closing cursor and opening didn’t fix it, I had to manually close the agent chat. If I opened that same chat again, the lag started and cursor was unusable. I deleted the chat and reopened cursor and it was ok.
But then it occurred a second time within a few minutes.
This hasn’t happened before 2.6.11 update, have been using cursor with these exact code base files for weeks without any issues.
Steps to Reproduce
Hard to say, but both times I was looking at a different file from the one the agent was editing. But I don’t know how to reproduce the issue as it seems related to agent response / edit tool use.
Screenshots / Screen Recordings
Operating System
Windows 10/11
Version Information
Version: 2.6.11 (user setup)
VSCode Version: 1.105.1
Commit: 8c95649f251a168cc4bb34c89531fae7db4bd990
Date: 2026-03-03T18:57:48.001Z
Build Type: Stable
Release Track: Default
Electron: 39.6.0
Chromium: 142.0.7444.265
Node.js: 22.22.0
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26200
For AI issues: which model did you use?
GPT-5.3 Codex
For AI issues: add Request ID with privacy disabled
751e5311-d4c2-448a-b323-28dc757c4f4d
Does this stop you from using Cursor
Yes - Cursor is unusable