30 rules for OpenAI Codex
Codex instructions for Angular: Standalone Components, Signals and Forms. Append to AGENTS.md. Structure, security, and tests. Angular 22.2.6, Nov 2026.
# Angular Codex Instructions: Standalone Components, Signals and Forms
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Angular Codex Instructions: Standalone Components, Signals and Forms
Section to append to `AGENTS.md` for Angular. This is project guidance, not a custom agent.
## Updated for Angular 22.2.6, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
New componen...Codex instructions for Django: ORM, Permissions and Migrations. Append to AGENTS.md. Structure, security, and tests. Django 6.1.3, Nov 2026.
# Django Codex Instructions: ORM, Permissions and Migrations
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Django Codex Instructions: ORM, Permissions and Migrations
Section to append to `AGENTS.md` for Django. This is project guidance, not a custom agent.
## Updated for Django 6.1.3, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
An app owns its models, forms, and ...Codex instructions for Docker: Images, Runtime Users and Build Secrets. Append to AGENTS.md. Structure, security, and tests. Docker Engine 29, Nov 2026.
# Docker Codex Instructions: Images, Runtime Users and Build Secrets
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Docker Codex Instructions: Images, Runtime Users and Build Secrets
Section to append to `AGENTS.md` for Docker. This is project guidance, not a custom agent.
## Updated for Docker Engine 29, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Keep Engine, BuildKit, and Compos...Codex instructions for .NET: Nullable Contracts, Async and Endpoints. Append to AGENTS.md. Structure, security, and tests. .NET 10 LTS and .NET 11, Nov 2026.
# .NET Codex Instructions: Nullable Contracts, Async and Endpoints
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# .NET Codex Instructions: Nullable Contracts, Async and Endpoints
Section to append to `AGENTS.md` for .NET. This is project guidance, not a custom agent.
## Updated for .NET 10 LTS and .NET 11, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
.NET 11 includes C# 15 unions an...Codex instructions for Express: Middleware, Routing and Validation. Append to AGENTS.md. Structure, security, and tests. Express 5.3.0, Nov 2026.
# Express Codex Instructions: Middleware, Routing and Validation
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Express Codex Instructions: Middleware, Routing and Validation
Section to append to `AGENTS.md` for Express. This is project guidance, not a custom agent.
## Updated for Express 5.3.0, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
Middleware is an ordered ...Codex instructions for FastAPI: Pydantic Models, Dependencies and Async. Append to AGENTS.md. Structure, security, and tests. FastAPI 0.162.5, Nov 2026.
# FastAPI Codex Instructions: Pydantic Models, Dependencies and Async
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# FastAPI Codex Instructions: Pydantic Models, Dependencies and Async
Section to append to `AGENTS.md` for FastAPI. This is project guidance, not a custom agent.
## Updated for FastAPI 0.162.5, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
Routers are s...Codex instructions for Flutter: Widgets, Async UI and Platform Builds. Append to AGENTS.md. Structure, security, and tests. Flutter 3.50, Nov 2026.
# Flutter Codex Instructions: Widgets, Async UI and Platform Builds
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Flutter Codex Instructions: Widgets, Async UI and Platform Builds
Section to append to `AGENTS.md` for Flutter. This is project guidance, not a custom agent.
## Updated for Flutter 3.50, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Write for the Flutter version in `pubs...Codex instructions for Go: Errors, Context and Goroutines. Append to AGENTS.md. Structure, security, and tests. Go 1.27.4, Nov 2026.
# Go Codex Instructions: Errors, Context and Goroutines
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Go Codex Instructions: Errors, Context and Goroutines
Section to append to `AGENTS.md` for Go. This is project guidance, not a custom agent.
## Updated for Go 1.27.4, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Go 1.27.4 is the current stable release on `go.dev/dl`. Go 1.26.11 is ...Codex instructions for Kotlin: Coroutines, Null Safety and Compose. Append to AGENTS.md. Structure, security, and tests. Kotlin 2.4 stable line, Nov 2026.
# Kotlin Codex Instructions: Coroutines, Null Safety and Compose
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Kotlin Codex Instructions: Coroutines, Null Safety and Compose
Section to append to `AGENTS.md` for Kotlin. This is project guidance, not a custom agent.
## Updated for Kotlin 2.4, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Stay on the Kotlin version the Gradle build use...Codex instructions for Laravel: Requests, Policies and Eloquent. Append to AGENTS.md. Structure, security, and tests. Laravel 13, Nov 2026.
# Laravel Codex Instructions: Requests, Policies and Eloquent
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Laravel Codex Instructions: Requests, Policies and Eloquent
Section to append to `AGENTS.md` for Laravel. This is project guidance, not a custom agent.
## Updated for Laravel 13, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Laravel 13 requires PHP 8.3 through 8.5. Read `compo...Codex instructions for MCP: Tools, Schemas and Permissions. Append to AGENTS.md. Structure, security, and tests. MCP spec 2026-07-28, server SDK 2.4.0, Nov 2026.
# MCP Codex Instructions: Tools, Schemas and Permissions
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# MCP Codex Instructions: Tools, Schemas and Permissions
Section to append to `AGENTS.md` for MCP. This is project guidance, not a custom agent.
## Updated for the 2026-07-28 MCP spec, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
The spec this file follows is the 2026-07-28 revision...Codex instructions for NestJS: Modules, DTOs and Guards. Append to AGENTS.md. Structure, security, and tests. NestJS 12.4.2, Nov 2026.
# NestJS Codex Instructions: Modules, DTOs and Guards
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# NestJS Codex Instructions: Modules, DTOs and Guards
Section to append to `AGENTS.md` for NestJS. This is project guidance, not a custom agent.
## Updated for NestJS 12.4.2, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
A feature is a module that declares its controll...Codex instructions for Next.js: App Router, TypeScript and Server Actions. Append to AGENTS.md. Structure, security, and tests. Next.js 16.4.6, Nov 2026.
# Next.js Codex Instructions: App Router, TypeScript and Server Actions
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Next.js Codex Instructions: App Router, TypeScript and Server Actions
Section to append to `AGENTS.md` for Next.js. This is project guidance, not a custom agent.
## Updated for Next.js 16.4.6, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Read `package.json`, the loc...Codex instructions for Node.js: ESM, Cancellation and Streams. Append to AGENTS.md. Structure, security, and tests. Node.js 26.13.1 LTS, Nov 2026.
# Node.js Codex Instructions: ESM, Cancellation and Streams
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Node.js Codex Instructions: ESM, Cancellation and Streams
Section to append to `AGENTS.md` for Node.js. This is project guidance, not a custom agent.
## Updated for Node.js 26.13.1 LTS, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Node.js 26.13.1 Lithium is the active LTS on no...Codex instructions for Nuxt: SSR Data, Nitro and Runtime Config. Append to AGENTS.md. Structure, security, and tests. Nuxt 4.6.4, Nov 2026.
# Nuxt Codex Instructions: SSR Data, Nitro and Runtime Config
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Nuxt Codex Instructions: SSR Data, Nitro and Runtime Config
Section to append to `AGENTS.md` for Nuxt. This is project guidance, not a custom agent.
## Updated for Nuxt 4.6.4, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
Pages and layouts live in the project...Codex instructions for Playwright: Locators, Fixtures and Assertions. Append to AGENTS.md. Structure, security, and tests. Playwright 1.65.0, Nov 2026.
# Playwright Codex Instructions: Locators, Fixtures and Assertions
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Playwright Codex Instructions: Locators, Fixtures and Assertions
Section to append to `AGENTS.md` for Playwright. This is project guidance, not a custom agent.
## Updated for Playwright 1.65.0, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
Tests live in ...Codex instructions for Prisma: Schema, Migrations and Query Shape. Append to AGENTS.md. Structure, security, and tests. Prisma 7.10.1 stable, Nov 2026.
# Prisma Codex Instructions: Schema, Migrations and Query Shape
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Prisma Codex Instructions: Schema, Migrations and Query Shape
Section to append to `AGENTS.md` for Prisma. This is project guidance, not a custom agent.
## Updated for Prisma 7.10.1 stable, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
The npm `latest` tag for `prisma` is an...Codex instructions for Python: Environments, Types and pytest. Append to AGENTS.md. Structure, security, and tests. uv 0.13.7 and Ruff 0.17.4, Nov 2026.
# Python Codex Instructions: Environments, Types and pytest
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Python Codex Instructions: Environments, Types and pytest
Section to append to `AGENTS.md` for Python. This is project guidance, not a custom agent.
## Updated for uv 0.13.7 and Ruff 0.17.4, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
Read `pyproject.toml` an...Codex instructions for Rails: Models, Strong Params and Jobs. Append to AGENTS.md. Structure, security, and tests. Rails 8.1.4.1, Nov 2026.
# Rails Codex Instructions: Models, Strong Params and Jobs
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# Rails Codex Instructions: Models, Strong Params and Jobs
Section to append to `AGENTS.md` for Rails. This is project guidance, not a custom agent.
## Updated for Rails 8.1.4.1, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Rails 8.1.4.1 is the current 8.1 security release. Stay o...Codex instructions for React: Components, State and Effects. Append to AGENTS.md. Structure, security, and tests. React 19.3.1, Nov 2026.
# React Codex Instructions: Components, State and Effects
## Install
Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent.
Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides.
<!-- native:start -->
# React Codex Instructions: Components, State and Effects
Section to append to `AGENTS.md` for React. This is project guidance, not a custom agent.
## Updated for React 19.3.1, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
## Project shape
Build the tree from function components. O...Loading all presets…