`/Summarize` breaks the chat

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

If you write a prompt and then call /Summarize at the end, the message will disappear. However, the summarization and the request will still be executed. But it will be impossible to revert to the original message and edit it, since the message disappears from the chat.

Steps to Reproduce

Screenshots / Screen Recordings

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.3.21 (system setup)
VSCode Version: 1.105.1
Commit: 68e0a0385b87408d050869ea543e3778ad53f780
Date: 2026-01-02T23:46:13.381Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Windows_NT x64 10.0.22631

For AI issues: add Request ID with privacy disabled

575bcb63-133f-48f1-8558-5551febbaab3 (Privacy on)

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

Thanks! I can reproduce this on Windows. Bug filed with the team.

This feature has broken at least twice this month. Please cover its code with robust tests :folded_hands:

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