cursor-rules-config

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---
name: cursor-rules-config
description: 'Configure Cursor project rules using .cursor/rules/*.mdc files and legacy
  .cursorrules. Triggers on "cursorrules",

  ".cursorrules", "cursor rules", "cursor config", "cursor project settings", ".mdc
  rules", "project rules".

  '
allowed-tools: Read, Write, Edit, Bash(cmd:*)
version: 1.18.0
license: MIT
author: Jeremy Longshore <[email protected]>
tags:
- saas
- cursor
- cursor-rules
compatibility: Designed for Claude Code, also compatible with Codex and OpenClaw
---
# Cursor Rules Config

Configure project-specific AI behavior through Cursor's rules system. The modern approach uses `.cursor/rules/*.mdc` files; the legacy `.cursorrules` file is still supported but deprecated.

## Rules System Architecture

### Modern Project Rules (.cursor/rules/*.mdc)

Each `.mdc` file contains YAML frontmatter followed by markdown content:

```yaml
---
description: "Enforce TypeScript strict mode and functional patterns"
globs: "src/**/*.ts,src/**/*.tsx"
alwaysApply: false
---
# TypeScript Standards

- Use `const` over `let`, never `var`
- Prefer pure functions over classes
- All functions must have explicit return types
- Use discriminated unions over enums
```

**Frontmatter fields:**

| Field | Type | Purpose |
|-------|------|---------|
| `description` | string | Concise rule purpose (shown in Cursor UI) |
| `globs` | string | Gitignore-style patterns for auto-attachment |
| `alwaysApply` | boolean | `true` = always active; `false` = only when matching files referenced |

### Rule Types by `alwaysApply` + `globs` Combination

| alwaysApply | globs | Behavior |
|-------------|-------|----------|
| `true` | empty | Always injected into every prompt |
| `false` | set | Auto-attached when matching files are in context |
| `false` | empty | Manual only -- reference with `@Cursor Rules` in chat |

### File Naming Convention

Use kebab-case with `.mdc` extension. Names should describe the rule's scope:

```
.cursor/rules/
  typescript-standards.mdc
  react-component-patterns.mdc
  api-error-handling.mdc
  testing-conventions.mdc
  database-migrations.mdc
  security-requirements.mdc
```

Create new rules via: `Cmd+Shift+P` > `New Cursor Rule`

### Complete Project Rules Example

**`.cursor/rules/project-context.mdc`** (always-on):

```yaml
---
description: "Core project context and conventions"
globs: ""
alwaysApply: true
---
# Project: E-Commerce Platform

Tech stack: Next.js 15, TypeScript 5.7, Prisma ORM, PostgreSQL, Tailwind CSS 4.
Package manager: pnpm. Monorepo with turborepo.

## Conventions
- API routes in `app/api/` using Route Handlers
- Server Components by default, `"use client"` only when needed
- Error boundaries at layout level
- All monetary values stored as integers (cents)
- Dates stored as UTC, displayed in user timezone
```

**`.cursor/rules/react-patterns.mdc`** (glob-scoped):

```yaml
---
description: "React component standards for TSX files"
globs: "src/**/*.tsx,app/**/*.tsx"
alwaysApply: false
---
# React Component Rules

- Export components as named exports, not default
- Props interface named `{Component}Props`
- Use `forwardRef` for components accepting `ref`
- Colocate styles in `.module.css` files
- Server Components: no `useState`, `useEffect`, or event handlers

```tsx
// Correct pattern
export interface ButtonProps {
  variant: 'primary' | 'secondary';
  children: React.ReactNode;
  onClick?: () => void;
}

export function Button({ variant, children, onClick }: ButtonProps) {
  return (
    <button className={styles[variant]} onClick={onClick}>
      {children}
    </button>
  );
}
```

```

**`.cursor/rules/api-routes.mdc`** (glob-scoped):
```yaml
---
description: "API route handler patterns"
globs: "app/api/**/*.ts"
alwaysApply: false
---
# API Route Standards

- Always validate request body with Zod
- Return typed `NextResponse.json()` responses
- Use consistent error response shape: `{ error: string, code: string }`
- Wrap handlers in try/catch with struc