Gemini 3 Pro responses showing <system_reminder>

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

In testing the new Gemini 3 Pro model many of the responses show <system_reminder></system_reminder> for Plan Mode in the response to the user.

Steps to Reproduce

Unclear but definitely Gemini 3 Pro specific and use Plan Mode/Build and follow up in Agent mode with more prompts after.

Expected Behavior

Do not show system reminders to the user.

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.77
VSCode Version: 1.99.3
Commit: ba90f2f88e4911312761abab9492c42442117cf0
Date: 2025-11-13T23:10:43.113Z
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

For AI issues: which model did you use?

Gemini 3 Pro

For AI issues: add Request ID with privacy disabled

Request ID:
d448638c-af95-477e-bdd8-38778fd35821

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hey, thanks for the report! This is a prompt engineering issue where internal system instructions are “leaking” into user-visible responses for Gemini 3.0 Pro.

Since Gemini 3.0 Pro only launched yesterday, the team is still working through a number of integration issues. I’ll pass this on to the team.

In the meantime, the model should still function correctly, and the tags are just visual noise in the output.