Cursor 3.0 - Agents Window syntax highlighting is broken

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

With the recent 3.0 update, I noticed in the Agents Window, syntax highlighting is completely broken for certain languages. In my case, it’s Vue components. I have the official Vue extension installed and am able to edit Vue files normally in the Editor view just fine, but the Agents Window > Files view appears not to be applying syntax highlighting correctly.

Would love to see this corrected — it would be nice to be able to work exclusively in the Agents Window and read everything as if it’s in the Editor view.

If you guys haven’t already, why not just use the Editor view’s components directly in the Agents Window for this UI so they’re sharing the same experience that respects my display preferences, extensions, etc.? If you are already, it seems like this is a minor bug maybe.

Come to think of it, I don’t see any way to change the Language mode for the file you’re currently viewing, like you can in the Editor.

Steps to Reproduce

  1. Open the Agents Window in an existing Vue project
  2. Open a Vue file in the Files view
  3. See that no syntax highlighting is applied to the Vue file

Expected Behavior

Vue files (and all other languages) should apply the appropriate syntax highlighting for the Language mode applied.

Screenshots / Screen Recordings

cursor3-agents-window-syntax-bug.png
cursor3-agents-window-syntax-bug.png2134×2164 411 KB

Operating System

MacOS

Version Information

Version: 3.0.9
VSCode Version: 1.105.1
Commit: 93e276db8a03af947eafb2d10241e2de17806c20
Date: 2026-04-03T02:06:46.446Z
Layout: editor
Build Type: Stable
Release Track: Default
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Darwin arm64 25.4.0

Does this stop you from using Cursor

No - Cursor works, but with this issue

2 Likes
5

Hey, thanks for the detailed report and the screenshot. I can see the issue. The Vue file shows up without syntax highlighting in the Agents Window.

This is a known bug. Syntax highlighting from extensions, including Vue and Volar, doesn’t always load correctly in the Agents Window. It works fine in the normal Editor, but in the Glass file viewer the extension grammars may not get registered.

The team is aware of this. There’s no exact ETA for a fix yet, but your report helps us prioritize it.

About changing the language mode in the Agents Window, that’s a valid point too. That option isn’t available right now.

Let me know if you notice anything else.

3 Likes
7

This single issue is keeping me away from using the Agent window. I work in a big Vue project, and not having the syntax highlighting is a really bad experience.

8

We’re experiencing the same issue but for .twig files