I installed Codex and cursor is adding to the system prompt codex specific skills

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

The system prompt is referencing SKILLS in .codex/skills/.system/*

Steps to Reproduce

Install Codex → ask the agent in cursor

Expected Behavior

These are codex specific skills, they likely do not makes sense for Cursor

Operating System

Windows 10/11

Version Information

Version: 2.6.20 (system setup)
VSCode Version: 1.105.1
Commit: b29eb4ee5f9f6d1cb2afbc09070198d3ea6ad760
Date: 2026-03-17T01:50:02.404Z
Build Type: Stable
Release Track: Early Access
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26200

Does this stop you from using Cursor

No - Cursor works, but with this issue

I’m new to this, but it looks like you are seeing this cause under Settings –> Rule, Skill, Subagents you have enabled the following option.

I don ‘t think it is related if you have installed codex in your environment or not.

Can you you confirm if the above option is enabled in your settings?

Hey, thanks for the report. This is a bug. Cursor isn’t filtering internal Codex skills from .codex/skills/.system/ like openai-docs, skill-creator, etc., even though they don’t make sense outside of Codex.

As a workaround, go to Settings → Rules, Skill, Subagents and turn off “Include third-party Plugins, Skills, and other configs”. This will remove .codex skills from the system prompt. The downside is it’ll also disable other third-party plugins and skills if you use them.

I’ve passed this on to the team. There’s no ETA yet, but your report will help with prioritization.

1 Like

yes is enabled and i need it because i use a ton of MCPs that comes with their own skill so i cannot disable it.

as Dean said this is a combination of codex polluting the skills folder of cursor and cursor needs to come up with a “special case workaround” to prevent codex from polluting their system context, probably they can even ask they devs at codex to stop doing it and provide an official way for 3rd party agents to add skills to cursor without interfeering with cursor agent