Best Cursor Rules

A curated collection of Cursor AI rules that actually work.

Skip the guesswork. These rules are battle-tested, framework-specific, and ready to drop into your project.

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Quick Start

Option A: Use the Setup Wizard (recommended)

1. Open your project in Cursor (not this repo)
2. Switch to Plan Mode or Agent Mode
3. Paste the contents of SETUP-WIZARD.md into the chat
4. Answer a few questions about your stack
5. Done! The AI creates your .cursor/rules/ folder automatically

Note: The wizard must be run from inside your actual project directory, not from this repository.

Tip

Plan Mode (recommended) — More structured. The AI analyzes your project, asks focused questions, shows you exactly what will be created, then executes after you confirm.

Tip

Agent Mode — More conversational. The AI iterates with you and creates files on the fly. Good if you want to adjust things as you go.

💎 Pro Tip Use the best model you have access to. The wizard does a lot of thinking upfront so you don't have to correct it later. Five minutes with a good model now saves hours of fixes down the road.

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Option B: Manual Setup

1. Create .cursor/rules/ in your project root
2. Copy the rules you need from the rules/ folder
3. Update the globs in each file to match your project structure

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Available Rules

Frameworks

Rule	Description
nextjs-15.mdc	Next.js 15 App Router, Server Components, Server Actions
react-19.mdc	React 19 patterns, hooks, and best practices
vue-3.mdc	Vue 3 Composition API and script setup
svelte-5.mdc	Svelte 5 runes and modern patterns
astro.mdc	Astro components and island architecture

Languages

Rule	Description
typescript.mdc	Strict TypeScript with modern type patterns
python.mdc	Python 3.12+ with type hints and async
go.mdc	Go idioms and error handling

Backends

Rule	Description
supabase.mdc	Auth, RLS, Edge Functions, Realtime
fastapi.mdc	FastAPI routes, Pydantic, async patterns
nodejs.mdc	Node.js with Express/Fastify

Styling

Rule	Description
tailwind.mdc	Tailwind CSS v4 patterns and organization
shadcn-ui.mdc	shadcn/ui component patterns

Testing

Rule	Description
vitest.mdc	Vitest with Testing Library
playwright.mdc	E2E testing with page objects

Best Practices

Rule	Description
clean-code.mdc	Naming, functions, DRY, SOLID
security.mdc	Auth patterns, secrets, validation
ai-security.mdc	LLM security, prompt injection, PII filtering
accessibility.mdc	ARIA, keyboard nav, screen readers

Stack Presets

These combine multiple rules for common technology combinations:

Rule	Stack
t3-stack.mdc	Next.js + tRPC + Prisma + Tailwind
nextjs-supabase.mdc	Next.js + Supabase + shadcn/ui
mern-stack.mdc	MongoDB + Express + React + Node.js
python-fastapi.mdc	FastAPI + PostgreSQL + SQLAlchemy
django-htmx.mdc	Django + HTMX + Tailwind

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How the Wizard Works

The Setup Wizard is a special prompt that turns Cursor into a project analyzer:

1. Detection - It reads your package.json, tsconfig.json, config files, etc.
2. Questions - Asks 4-6 questions to understand your preferences
3. Planning - Shows you exactly which rules will be created
4. Execution - Creates .cursor/rules/ with customized rules

The wizard adapts to your project. Using Supabase? It includes those patterns. TypeScript strict mode? It adjusts accordingly. It's not a one-size-fits-all dump of rules.

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Rule Format

Each rule uses the MDC (Markdown + Config) format:

---
description: Brief description for AI context
globs: ["**/*.tsx", "**/*.ts"]
alwaysApply: false
---

# Rule Title

## Section
Content, code examples, tables, etc.

• description - Helps the AI understand when to apply this rule
• globs - File patterns that trigger this rule (empty = manual only)
• alwaysApply - If true, always included regardless of file type

Rules are written to be concise and scannable. No fluff, just patterns and examples.

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Contributing

Want to add a rule or fix something? Check out CONTRIBUTING.md.

The short version:

1. Fork the repo
2. Add/edit rules in rules/
3. Follow the format in .cursor/rules/01-rule-format.mdc
4. Submit a PR

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Why This Exists

Cursor's AI is powerful, but it doesn't know your stack. These rules give it the context it needs:

• "Use Server Components by default" (Next.js 15)
• "Always enable RLS on tables" (Supabase)
• "Prefer unknown over any" (TypeScript)

Without rules, you end up correcting the AI constantly. With the right rules, it writes code the way you want it.

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Credits

Maintained by Renvia Technologies with contributions from the community.

Licensed under CC0 - do whatever you want with these rules.

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"Most good programmers do programming not because they expect to get paid or get adulation by the public, but because it is fun to program."
_{— Linus Torvalds}

_{Built with ☕ and too many terminal tabs}