REST API Design Skill | Agent Skills

REST API Design

Design RESTful APIs with proper conventions and developer experience.

Resource Naming

# Good - nouns, plural, hierarchical
GET    /api/users
GET    /api/users/123
GET    /api/users/123/orders
POST   /api/users
PATCH  /api/users/123
DELETE /api/users/123

# Bad - verbs, actions in URL
GET    /api/getUsers
POST   /api/createUser
POST   /api/users/123/delete

HTTP Methods

| Method | Purpose | Idempotent | |--------|---------|------------| | GET | Read resource | Yes | | POST | Create resource | No | | PUT | Replace resource | Yes | | PATCH | Partial update | Yes | | DELETE | Remove resource | Yes |

Status Codes

| Code | Meaning | Use For | |------|---------|---------| | 200 | OK | Successful GET, PATCH | | 201 | Created | Successful POST | | 204 | No Content | Successful DELETE | | 400 | Bad Request | Validation errors | | 401 | Unauthorized | Missing auth | | 403 | Forbidden | Insufficient permissions | | 404 | Not Found | Resource doesn't exist | | 429 | Too Many Requests | Rate limited |

Response Format

{
  "data": {
    "id": "123",
    "type": "user",
    "attributes": {
      "name": "John",
      "email": "john@example.com"
    }
  },
  "meta": {
    "requestId": "req_abc123"
  }
}

Collection Response

{
  "data": [...],
  "pagination": {
    "page": 1,
    "limit": 20,
    "total": 150,
    "totalPages": 8
  },
  "links": {
    "self": "/api/users?page=1",
    "next": "/api/users?page=2"
  }
}

Query Parameters

GET /api/products?category=electronics    # Filtering
GET /api/products?sort=-price,name        # Sorting
GET /api/products?page=2&limit=20         # Pagination
GET /api/products?fields=id,name,price    # Field selection

Best Practices

Use nouns for resources, not verbs
Version API via URL path (/api/v1/)
Return appropriate status codes
Include pagination for collections
Document with OpenAPI/Swagger

Agent Skills: REST API Design

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