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rest-api-designer

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更新日2025年12月16日 00:15

Design RESTful APIs with OpenAPI 3.1/3.2, resource modeling, HTTP semantics, versioning, pagination, HATEOAS, and OWASP API Security.

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Purpose & When-To-Use

Purpose: Design production-ready RESTful APIs following industry best practices with OpenAPI 3.1/3.2 specifications, resource-oriented architecture, HTTP semantics compliance, flexible pagination/filtering strategies, HATEOAS hypermedia support (Richardson Level 3), and OWASP API Security Top 10 2023 mitigations.

When to Use:

You need to design a new REST API from scratch with clear resource models, URI conventions, and HTTP method semantics.
You want to generate OpenAPI 3.1/3.2 specifications with JSON Schema validation, webhooks, and security schemes.
You're migrating from Level 0/1 APIs (SOAP, RPC-style) to Level 2+ REST with proper HTTP verb usage.
You need to implement API versioning (URI, header, or media type) without breaking existing clients.
You require pagination, filtering, and sorting for large datasets (offset, cursor, or keyset pagination).
You're implementing HATEOAS (Level 3 REST) with hypermedia links for discoverable APIs.
You need OWASP API Security compliance (authentication, authorization, rate limiting, input validation).
You're integrating with API gateways (AWS API Gateway, Kong, Apigee) for rate limiting and transformation.

Complements:

api-graphql-designer: Use GraphQL for flexible client-driven queries; use REST for simple CRUD and public APIs.
api-contract-testing: Validate OpenAPI specs with Pact or Spring Cloud Contract.
security-api-gateway-configurator: Deploy REST APIs with gateway-level auth, throttling, and monitoring.

Delegates to:

api-design-validator: Validates generated OpenAPI specs for schema compliance and security hardening.

Pre-Checks

Mandatory Inputs:

domain_model: At least one entity with attributes (e.g., User: {id, email, name}).
use_cases: Minimum one use case (e.g., "List all users", "Create a new order").

Validation Steps:

Compute NOW_ET using NIST time.gov semantics (America/New_York, ISO-8601) for timestamp anchoring.
Check domain_model completeness: Verify entities have primary keys and relationships (one-to-many, many-to-many).
Validate use_cases: Ensure use cases map to HTTP methods (GET for retrieval, POST for creation, etc.).
Assess maturity_target: If maturity_target = 3, verify client can handle HATEOAS links (many clients only support Level 2).
Abort if:
- Zero entities in domain_model.
- Use cases conflict with HTTP semantics (e.g., "Delete user" mapped to GET).
- Versioning strategy is "header" but API gateway doesn't support custom headers.

Procedure

T1: Quick REST API Design (≤2k tokens, 80% use case)

Goal: Generate a basic RESTful API with OpenAPI 3.1 spec for a single resource using standard CRUD operations.

Steps:

Identify primary resource: Select the main entity from domain_model (e.g., "User").
Design resource URIs:
- Collection: GET /users, POST /users
- Singleton: GET /users/{id}, PUT /users/{id}, PATCH /users/{id}, DELETE /users/{id}
Map HTTP methods to operations:
- GET /users: List all users (paginate with ?limit=20&offset=0 by default).
- POST /users: Create a new user (return 201 Created with Location header).
- GET /users/{id}: Retrieve a single user (return 200 OK or 404 Not Found).
- PUT /users/{id}: Replace entire user (idempotent, return 200 OK).
- PATCH /users/{id}: Partial update (return 200 OK or 204 No Content).
- DELETE /users/{id}: Delete user (idempotent, return 204 No Content).

Generate OpenAPI 3.1 spec (minimal):

openapi: 3.1.0
info:
  title: User API
  version: 1.0.0
paths:
  /users:
    get:
      summary: List users
      parameters:
        - name: limit
          in: query
          schema: {type: integer, default: 20}
        - name: offset
          in: query
          schema: {type: integer, default: 0}
      responses:
        200:
          description: List of users
          content:
            application/json:
              schema:
                type: array
                items: {$ref: '#/components/schemas/User'}
    post:
      summary: Create user
      requestBody:
        required: true
        content:
          application/json:
            schema: {$ref: '#/components/schemas/User'}
      responses:
        201:
          description: User created
          headers:
            Location: {schema: {type: string}}
components:
  schemas:
    User:
      type: object
      required: [email, name]
      properties:
        id: {type: string, format: uuid}
        email: {type: string, format: email}
        name: {type: string}

Output: OpenAPI spec (YAML), Richardson Level 2 compliance confirmed.

Token Budget: ≤2k tokens (single resource, basic CRUD).

T2: Multi-Resource API with Versioning and Pagination (≤6k tokens)

Goal: Design a multi-resource API with versioning, pagination (cursor or offset), filtering, and OWASP API Security mitigations.

Steps:

Model all resources and relationships:
- Identify entities: User, Order, Product.
- Map relationships: User has many Orders, Order has many Products (via OrderItems).
Design nested and flat URIs:
- Flat (preferred): GET /orders?userId=123 (query filtering).
- Nested: GET /users/{userId}/orders (if relationship is always accessed via parent).
- Decision rule: Use flat URIs unless relationship is always accessed through parent (e.g., /users/{id}/settings where settings don't exist independently).
Apply versioning strategy (default: URI versioning):
- URI versioning: /v1/users, /v2/users (most common, clear, cacheable).
- Header versioning: X-API-Version: 2 (clean URIs, harder to test in browser).
- Media type: Accept: application/vnd.api.v2+json (REST purist, complex for clients).
- Selection criteria: Use URI versioning unless gateway mandates header-based routing.
Implement pagination (choose based on pagination_preference):
- Offset-based (default):
  - Request: GET /orders?limit=20&offset=40
  - Response: {data: [...], pagination: {total: 150, limit: 20, offset: 40}}
  - Pros: Simple, stateless, supports random access (jump to page 5).
  - Cons: Slow for large offsets (DB scans first N rows), page drift (new items shift results).
- Cursor-based (recommended for real-time data):
  - Request: GET /orders?limit=20&after=cursorXYZ
  - Response: {data: [...], pagination: {nextCursor: "abc123", hasMore: true}}
  - Pros: Efficient (no offset scan), consistent (no page drift), ideal for infinite scroll.
  - Cons: No random access, cursor is opaque (can't jump to page 5).
- Keyset-based (best performance):
  - Request: GET /orders?limit=20&afterId=1000&afterCreatedAt=2025-10-26T12:00:00Z
  - Response: Uses indexed columns (id, createdAt) for WHERE clause.
  - Pros: Fast (index seek), deterministic, no drift.
  - Cons: Requires stable sort key, complex for clients.
Add filtering and sorting:
- Filtering: GET /orders?status=completed&minAmount=100
- Sorting: GET /orders?sort=createdAt:desc,amount:asc (multi-column).
- Rule: Apply filters/sort BEFORE pagination; sort must be deterministic (add id as tiebreaker).
Implement OWASP API Security Top 10 2023 mitigations:
- API1: Broken Object Level Authorization (BOLA): Validate userId matches authenticated user before returning /users/{userId}.
- API2: Broken Authentication: Use OAuth2/JWT, validate tokens on every request.
- API3: Broken Object Property Level Authorization: Don't expose internal fields (passwordHash, internalId) in responses.
- API4: Unrestricted Resource Consumption: Rate limit (e.g., 100 req/min per user) via API gateway or middleware.
- API5: Broken Function Level Authorization: Check permissions for admin-only endpoints (DELETE /users/{id} requires admin role).
- API6: Unrestricted Access to Sensitive Business Flows: Throttle sensitive actions (password reset: 3 attempts/hour).
- API7: Server-Side Request Forgery (SSRF): Validate all external URLs in requests (e.g., webhook callbacks).
- API8: Security Misconfiguration: Disable verbose error messages in production (no stack traces in 500 responses).
- API9: Improper Inventory Management: Document all endpoints in OpenAPI spec; deprecate old versions explicitly.
- API10: Unsafe Consumption of APIs: Validate all data from upstream APIs (don't trust external sources).

Generate OpenAPI 3.1 spec with security schemes:

openapi: 3.1.0
info:
  title: E-commerce API
  version: 2.0.0
servers:
  - url: https://api.example.com/v2
paths:
  /orders:
    get:
      summary: List orders
      parameters:
        - name: limit
          in: query
          schema: {type: integer, default: 20, maximum: 100}
        - name: after
          in: query
          schema: {type: string}
        - name: status
          in: query
          schema: {type: string, enum: [pending, completed, cancelled]}
      security:
        - bearerAuth: []
      responses:
        200:
          description: List of orders
          content:
            application/json:
              schema:
                type: object
                properties:
                  data: {type: array, items: {$ref: '#/components/schemas/Order'}}
                  pagination:
                    type: object
                    properties:
                      nextCursor: {type: string}
                      hasMore: {type: boolean}
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
  schemas:
    Order:
      type: object
      required: [id, userId, status, total]
      properties:
        id: {type: string, format: uuid}
        userId: {type: string, format: uuid}
        status: {type: string, enum: [pending, completed, cancelled]}
        total: {type: number, format: decimal}

Output:
- OpenAPI 3.1 spec with 3+ resources, versioning, pagination, security.
- Resource design doc with URI patterns and relationship mappings.
- Pagination config (chosen strategy + migration path from offset to cursor if needed).
- OWASP API Security checklist (10 mitigations applied).

Token Budget: ≤6k tokens (multi-resource, versioning, pagination, security).

T3: HATEOAS API with Advanced Patterns (≤12k tokens)

Goal: Design a Richardson Level 3 REST API with HATEOAS hypermedia links, webhooks, bulk operations, and advanced security.

Steps:

Implement HATEOAS links (Richardson Level 3):

Every resource includes _links section with self, related, and action links.

Example:

{
  "id": "order-123",
  "status": "pending",
  "total": 99.99,
  "_links": {
    "self": {"href": "/v2/orders/order-123"},
    "user": {"href": "/v2/users/user-456"},
    "items": {"href": "/v2/orders/order-123/items"},
    "cancel": {"href": "/v2/orders/order-123/cancel", "method": "POST"},
    "pay": {"href": "/v2/orders/order-123/pay", "method": "POST"}
  }
}

Benefit: Clients discover actions dynamically (if status=pending, show "cancel" and "pay" links; if status=completed, hide those links).

Add webhooks (OpenAPI 3.1 feature):

Define outbound events (e.g., "order.created", "order.completed") that the API will POST to client-registered URLs.

OpenAPI 3.1 webhooks section:

webhooks:
  orderCreated:
    post:
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                event: {type: string, example: "order.created"}
                data: {$ref: '#/components/schemas/Order'}
      responses:
        200:
          description: Webhook received

Design bulk operations:
- Batch GET: GET /users?ids=1,2,3 (return array of users).
- Batch POST: POST /users/batch with array of users in body (return array of created users).
- Batch PATCH: PATCH /users/batch with array of {id, changes} objects.
- Idempotency: Use Idempotency-Key header for POST/PATCH to prevent duplicate operations.
Implement advanced filtering:
- Range queries: ?createdAt[gte]=2025-01-01&createdAt[lt]=2025-02-01
- Full-text search: ?q=laptop (searches across multiple fields).
- Logical operators: ?status[in]=pending,completed (OR), ?status[ne]=cancelled (NOT EQUAL).
Add caching and ETag support:
- GET /users/{id} returns ETag: "abc123" header.
- Client sends If-None-Match: "abc123" on next request.
- Server returns 304 Not Modified if resource unchanged (saves bandwidth).

Error handling with RFC 7807 Problem Details:

{
  "type": "https://api.example.com/errors/validation-error",
  "title": "Validation Error",
  "status": 400,
  "detail": "Email field is required",
  "instance": "/v2/users",
  "errors": [
    {"field": "email", "message": "Email is required"}
  ]
}

Rate limiting with standardized headers:
- Response headers:
  - X-RateLimit-Limit: 100
  - X-RateLimit-Remaining: 95
  - X-RateLimit-Reset: 1698345600 (Unix timestamp)
- Return 429 Too Many Requests with Retry-After header.
Versioning migration strategy:
- Maintain 2 versions simultaneously (v1, v2) for 6 months.
- Add Deprecation: true and Sunset: 2026-04-26 headers to v1 responses.
- Provide migration guide in API docs showing v1 → v2 breaking changes.
Generate comprehensive OpenAPI 3.2 spec:
- Full schemas with JSON Schema 2020-12 validation (pattern, format, min/max).
- Security schemes (OAuth2 with flows, API key, mTLS).
- Examples for all request/response bodies.
- Webhooks definitions.
- Links for HATEOAS navigation.
Output:
- OpenAPI 3.2 spec (500-1000 lines) with HATEOAS, webhooks, bulk operations.
- Resource design with all URI patterns, relationship graphs.
- Versioning migration guide (v1 → v2 breaking changes, timeline).
- Pagination comparison table (offset vs cursor vs keyset).
- OWASP API Security Top 10 compliance report (all 10 mitigations documented).
- Rate limiting config (limits per endpoint, throttling strategy).
- Caching strategy (ETag, Cache-Control headers).

Token Budget: ≤12k tokens (HATEOAS, webhooks, bulk ops, advanced security, caching).

Decision Rules

Ambiguity Resolution:

If versioning_strategy not specified:
- Default to URI versioning (/v1/, /v2/) as it's most widely adopted and easiest to test.
- Emit note: "Using URI versioning by default. Consider header versioning if clean URIs are required."
If pagination_preference not specified:
- Default to offset-based for simplicity unless use case mentions "real-time", "feed", or "infinite scroll" (then use cursor).
- Emit note: "Using offset pagination. Migrate to cursor pagination for real-time feeds to avoid page drift."
If maturity_target not specified:
- Target Richardson Level 2 (proper HTTP verbs, multiple resources) as Level 3 (HATEOAS) adds complexity most clients don't need.
- Emit note: "Targeting Richardson Level 2. Add HATEOAS (Level 3) if API discoverability is required."
If multiple resources share similar names:
- Use plural nouns for collections (/users, not /user).
- Avoid verbs in URIs (/createUser is wrong; use POST /users instead).
If relationship can be represented flat or nested:
- Prefer flat URIs with filtering (GET /orders?userId=123) for flexibility.
- Use nested URIs only if relationship is exclusive (GET /users/{id}/profile where profile can't exist without user).

Stop Conditions:

Conflicting HTTP semantics: User requests "GET /users/{id}/delete" → abort and suggest DELETE /users/{id}.
Security requirements impossible: User requires OAuth2 but API gateway doesn't support it → emit error with alternatives (API key, mTLS).
Pagination strategy conflicts with data model: User wants cursor pagination but entities lack stable sort key → abort and suggest keyset with id + createdAt.

Thresholds:

Pagination limits: Max limit=100 to prevent resource exhaustion. Return 400 Bad Request if limit > 100.
Nested URI depth: Max 2 levels (/users/{id}/orders/{orderId} is OK; /users/{id}/orders/{orderId}/items/{itemId} is too deep → flatten to /order-items/{id}).
Versioning concurrency: Support max 2 versions simultaneously (e.g., v1 + v2). Deprecate v1 after 6 months.

Output Contract

Required Fields:

{
  openapi_spec: {
    openapi: "3.1.0" | "3.2.0";
    info: {
      title: string;
      version: string;         // Semantic version (1.0.0, 2.1.0)
      description?: string;
    };
    servers: Array<{
      url: string;             // https://api.example.com/v2
      description?: string;
    }>;
    paths: {
      [path: string]: {        // /users, /users/{id}, etc.
        [method: string]: {    // get, post, put, patch, delete
          summary: string;
          parameters?: Array<{
            name: string;
            in: "query" | "path" | "header";
            schema: object;    // JSON Schema
            required?: boolean;
          }>;
          requestBody?: {
            required: boolean;
            content: {
              "application/json": {
                schema: object;
              };
            };
          };
          responses: {
            [statusCode: string]: {
              description: string;
              content?: {
                "application/json": {
                  schema: object;
                };
              };
            };
          };
          security?: Array<object>;
        };
      };
    };
    components: {
      schemas: {
        [name: string]: object; // JSON Schema definitions
      };
      securitySchemes?: {
        [name: string]: {
          type: "http" | "apiKey" | "oauth2" | "openIdConnect" | "mutualTLS";
          scheme?: "bearer" | "basic";
          bearerFormat?: "JWT";
        };
      };
    };
    webhooks?: {               // OpenAPI 3.1+ only
      [name: string]: {
        post: object;          // Outbound webhook definition
      };
    };
  };
  resource_design: {
    resources: Array<{
      name: string;            // User, Order, Product
      uri_template: string;    // /users, /users/{id}
      http_methods: {
        GET?: string;          // Description (e.g., "List all users")
        POST?: string;
        PUT?: string;
        PATCH?: string;
        DELETE?: string;
      };
      relationships: Array<{
        related_resource: string;
        relationship_type: "one-to-many" | "many-to-many" | "one-to-one";
        uri_pattern: string;  // /users/{userId}/orders or /orders?userId={userId}
      }>;
    }>;
    richardson_level: 0 | 1 | 2 | 3;
  };
  versioning_config: {
    strategy: "uri" | "header" | "media-type";
    current_version: string;  // v2, 2.0.0
    supported_versions: string[]; // [v1, v2]
    deprecation_timeline?: {
      deprecated_version: string;
      sunset_date: string;    // ISO 8601
    };
    migration_guide: string;  // Breaking changes, timeline
  };
  pagination_config: {
    method: "offset" | "cursor" | "keyset";
    parameters: {
      limit: {
        default: number;      // 20
        max: number;          // 100
      };
      offset?: number;        // For offset-based
      cursor?: string;        // For cursor-based
      sortKey?: string;       // For keyset-based
    };
    response_format: {
      data_field: string;     // "data" or "items"
      metadata_field: string; // "pagination" or "meta"
      metadata_shape: object; // {total, limit, offset} or {nextCursor, hasMore}
    };
  };
  security_recommendations: Array<{
    owasp_category: string;   // API1: BOLA, API2: Broken Auth, etc.
    risk: "high" | "medium" | "low";
    mitigation: string;       // Specific action (e.g., "Validate userId matches JWT")
    implementation: string;   // Code snippet or config example
  }>;
  hateoas_links?: {           // Only if maturity_target >= 3
    link_relations: Array<{
      rel: string;            // self, related, action
      href_template: string;  // /users/{id}, /users/{id}/orders
      method?: string;        // POST, DELETE (for action links)
    }>;
    example_response: object; // JSON with _links section
  };
}

Optional Fields:

webhooks: Array of webhook definitions (event name, payload schema, delivery guarantees).
caching_strategy: Object with ETag usage, Cache-Control headers, max-age values.
rate_limiting: Object with limits per endpoint, throttling algorithm (token bucket, leaky bucket).
bulk_operations: Array of batch endpoints (/users/batch, etc.) with idempotency requirements.

Format: OpenAPI spec in YAML or JSON. Resource design and recommendations in Markdown.

Examples

Example 1: E-commerce API (T2 - Multi-Resource with Pagination)

Input:

domain_model:
  User: {id: uuid, email: string, name: string}
  Order: {id: uuid, userId: uuid, status: enum, total: decimal}
  Product: {id: uuid, name: string, price: decimal}
use_cases:
  - "List all orders for a user"
  - "Create a new order"
  - "Search products by name"
versioning_strategy: "uri"
pagination_preference: "cursor"
security_requirements:
  auth: "OAuth2 (Bearer JWT)"
  rate_limit: "100 requests/minute per user"

Output (T2 Summary):

Richardson Level: 2 (HTTP verbs + multiple resources)
Versioning: URI-based (/v1/, /v2/)
Pagination: Cursor-based (after parameter, nextCursor in response)
Resources:
  - /v1/users (GET, POST)
  - /v1/users/{id} (GET, PUT, PATCH, DELETE)
  - /v1/orders (GET, POST) + ?userId filter + ?after cursor
  - /v1/orders/{id} (GET, PUT, PATCH, DELETE)
  - /v1/products (GET, POST) + ?q=search query
Security: OAuth2 Bearer JWT, rate limit 100/min via X-RateLimit headers
OWASP Mitigations:
  - API1 BOLA: Validate userId in JWT matches /users/{id} access
  - API4 Rate Limit: 100 req/min via API gateway (429 response if exceeded)
  - API8 Misconfiguration: No stack traces in production (generic 500 message)

Link to Full Example: See skills/api-rest-designer/examples/ecommerce-api-design.txt

Example 2: HATEOAS API with Webhooks (T3 Snippet)

HATEOAS Response Example:

{
  "id": "order-456",
  "status": "pending",
  "total": 149.99,
  "_links": {
    "self": {"href": "/v2/orders/order-456"},
    "user": {"href": "/v2/users/user-789"},
    "items": {"href": "/v2/orders/order-456/items"},
    "cancel": {"href": "/v2/orders/order-456/cancel", "method": "POST"},
    "pay": {"href": "/v2/payments", "method": "POST", "body": {"orderId": "order-456"}}
  }
}

Webhook Definition (OpenAPI 3.1):

webhooks:
  orderCompleted:
    post:
      summary: Notifies when an order is completed
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                event: {type: string, example: "order.completed"}
                timestamp: {type: string, format: date-time}
                data: {$ref: '#/components/schemas/Order'}
      responses:
        200:
          description: Webhook acknowledged

Quality Gates

Token Budget Compliance:

T1 output ≤2k tokens (single resource, basic CRUD).
T2 output ≤6k tokens (multi-resource, versioning, pagination, security).
T3 output ≤12k tokens (HATEOAS, webhooks, bulk ops, advanced security).

Validation Checklist:

Safety & Auditability:

No secrets in spec: Redact all API keys, tokens, passwords in OpenAPI examples.
Deprecation notices: If deprecating endpoints, add deprecated: true in OpenAPI and Sunset header in responses.
CORS configuration: Document Access-Control-Allow-Origin settings if API is public-facing.

Determinism:

Stable sorting: All paginated endpoints must have deterministic sort order (add id as tiebreaker if primary sort isn't unique).
Idempotency: POST endpoints support Idempotency-Key header to prevent duplicate resource creation.

Resources

Official Specifications:

OpenAPI Specification v3.2.0 (accessed 2025-10-26)
- Latest spec with JSON Schema 2020-12, webhooks, streaming media types.
RFC 9110: HTTP Semantics (accessed 2025-10-26)
- Definitive guide for HTTP method semantics (GET, POST, PUT, PATCH, DELETE).
RFC 7807: Problem Details for HTTP APIs (accessed 2025-10-26)
- Standard error response format.

Security:

OWASP API Security Top 10 2023 (accessed 2025-10-26)
- API1: BOLA, API2: Broken Auth, API3: Broken Object Property, API4: Resource Consumption, API5: Function Auth, API6: Sensitive Flows, API7: SSRF, API8: Misconfiguration, API9: Inventory, API10: Unsafe Consumption.

REST Design Patterns:

Richardson Maturity Model (accessed 2025-10-26)
- Level 0: POX (Plain Old XML), Level 1: Resources, Level 2: HTTP Verbs, Level 3: HATEOAS.
REST API Design Best Practices (accessed 2025-10-26)
- Filtering, sorting, pagination patterns.

Pagination:

API Pagination Best Practices (accessed 2025-10-26)
- Offset vs cursor vs keyset comparison.

Versioning:

API Versioning Strategies 2025 (accessed 2025-10-26)
- URI, header, media type versioning pros/cons.

Complementary Skills:

api-graphql-designer: Alternative to REST for flexible client queries.
api-contract-testing: Validate OpenAPI specs with Pact, Spring Cloud Contract.
security-api-gateway-configurator: Deploy REST APIs with gateway-level auth, rate limiting, monitoring.
api-design-validator: Automated OpenAPI spec validation and security hardening.

name	REST API Designer
slug	api-rest-designer
description	Design RESTful APIs with OpenAPI 3.1/3.2, resource modeling, HTTP semantics, versioning, pagination, HATEOAS, and OWASP API Security.
capabilities	["OpenAPI 3.1/3.2 specification generation (JSON Schema 2020-12, webhooks)","Resource modeling and URI design (collection, singleton, controller patterns)","HTTP method semantics (GET, POST, PUT, PATCH, DELETE, OPTIONS, HEAD)","Richardson Maturity Model assessment (Level 0-3)","API versioning (URI, header, media type/content negotiation)","Pagination (offset-based, cursor-based, keyset)","Filtering, sorting, and search patterns","HATEOAS link generation (Level 3 REST)","Rate limiting and throttling strategies","OWASP API Security Top 10 2023 compliance","Error response design (RFC 7807 Problem Details)","Idempotency and safe method guarantees"]
inputs	{"domain_model":{"type":"object","description":"Domain entities and relationships (e.g., User, Order, Product)","required":true},"use_cases":{"type":"array","description":"Key API use cases (CRUD, search, bulk operations, webhooks)","required":true},"versioning_strategy":{"type":"string","description":"Versioning approach (uri, header, media-type)","required":false},"pagination_preference":{"type":"string","description":"Preferred pagination method (offset, cursor, keyset)","required":false},"security_requirements":{"type":"object","description":"Auth (OAuth2, API key), rate limits, CORS, allowed origins","required":false},"maturity_target":{"type":"integer","description":"Richardson Maturity Model target level (0-3)","required":false}}
outputs	{"openapi_spec":{"type":"object","description":"OpenAPI 3.1/3.2 specification (YAML or JSON)"},"resource_design":{"type":"object","description":"Resource URIs, relationships, and HTTP method mappings"},"versioning_config":{"type":"object","description":"Versioning strategy with examples and migration guide"},"pagination_config":{"type":"object","description":"Pagination parameters, response format, and metadata"},"security_recommendations":{"type":"array","description":"OWASP API Security Top 10 mitigations and best practices"},"hateoas_links":{"type":"object","description":"Hypermedia links for resource navigation (Level 3 REST)"}}
keywords	["rest-api","openapi","api-design","resource-modeling","http-methods","richardson-maturity-model","hateoas","api-versioning","pagination","api-security","owasp","swagger","api-gateway"]
version	1.0.0
owner	cognitive-toolworks
license	Apache-2.0
security	{"secrets":"Never hardcode API keys or tokens in OpenAPI examples; use placeholder values","compliance":"OWASP API Security Top 10 2023, RFC 9110 (HTTP Semantics), RFC 7807 (Problem Details)"}
links	[{"title":"OpenAPI Specification v3.2.0","url":"https://spec.openapis.org/oas/v3.2.0.html","accessed":"2025-10-26"},{"title":"OWASP API Security Top 10 2023","url":"https://owasp.org/API-Security/editions/2023/en/0x11-t10/","accessed":"2025-10-26"},{"title":"Richardson Maturity Model","url":"https://martinfowler.com/articles/richardsonMaturityModel.html","accessed":"2025-10-26"},{"title":"RFC 9110: HTTP Semantics","url":"https://www.rfc-editor.org/rfc/rfc9110.html","accessed":"2025-10-26"},{"title":"RFC 7807: Problem Details for HTTP APIs","url":"https://www.rfc-editor.org/rfc/rfc7807.html","accessed":"2025-10-26"}]

name	REST API Designer
slug	api-rest-designer
description	Design RESTful APIs with OpenAPI 3.1/3.2, resource modeling, HTTP semantics, versioning, pagination, HATEOAS, and OWASP API Security.
capabilities	["OpenAPI 3.1/3.2 specification generation (JSON Schema 2020-12, webhooks)","Resource modeling and URI design (collection, singleton, controller patterns)","HTTP method semantics (GET, POST, PUT, PATCH, DELETE, OPTIONS, HEAD)","Richardson Maturity Model assessment (Level 0-3)","API versioning (URI, header, media type/content negotiation)","Pagination (offset-based, cursor-based, keyset)","Filtering, sorting, and search patterns","HATEOAS link generation (Level 3 REST)","Rate limiting and throttling strategies","OWASP API Security Top 10 2023 compliance","Error response design (RFC 7807 Problem Details)","Idempotency and safe method guarantees"]
inputs	{"domain_model":{"type":"object","description":"Domain entities and relationships (e.g., User, Order, Product)","required":true},"use_cases":{"type":"array","description":"Key API use cases (CRUD, search, bulk operations, webhooks)","required":true},"versioning_strategy":{"type":"string","description":"Versioning approach (uri, header, media-type)","required":false},"pagination_preference":{"type":"string","description":"Preferred pagination method (offset, cursor, keyset)","required":false},"security_requirements":{"type":"object","description":"Auth (OAuth2, API key), rate limits, CORS, allowed origins","required":false},"maturity_target":{"type":"integer","description":"Richardson Maturity Model target level (0-3)","required":false}}
outputs	{"openapi_spec":{"type":"object","description":"OpenAPI 3.1/3.2 specification (YAML or JSON)"},"resource_design":{"type":"object","description":"Resource URIs, relationships, and HTTP method mappings"},"versioning_config":{"type":"object","description":"Versioning strategy with examples and migration guide"},"pagination_config":{"type":"object","description":"Pagination parameters, response format, and metadata"},"security_recommendations":{"type":"array","description":"OWASP API Security Top 10 mitigations and best practices"},"hateoas_links":{"type":"object","description":"Hypermedia links for resource navigation (Level 3 REST)"}}
keywords	["rest-api","openapi","api-design","resource-modeling","http-methods","richardson-maturity-model","hateoas","api-versioning","pagination","api-security","owasp","swagger","api-gateway"]
version	1.0.0
owner	cognitive-toolworks
license	Apache-2.0
security	{"secrets":"Never hardcode API keys or tokens in OpenAPI examples; use placeholder values","compliance":"OWASP API Security Top 10 2023, RFC 9110 (HTTP Semantics), RFC 7807 (Problem Details)"}
links	[{"title":"OpenAPI Specification v3.2.0","url":"https://spec.openapis.org/oas/v3.2.0.html","accessed":"2025-10-26"},{"title":"OWASP API Security Top 10 2023","url":"https://owasp.org/API-Security/editions/2023/en/0x11-t10/","accessed":"2025-10-26"},{"title":"Richardson Maturity Model","url":"https://martinfowler.com/articles/richardsonMaturityModel.html","accessed":"2025-10-26"},{"title":"RFC 9110: HTTP Semantics","url":"https://www.rfc-editor.org/rfc/rfc9110.html","accessed":"2025-10-26"},{"title":"RFC 7807: Problem Details for HTTP APIs","url":"https://www.rfc-editor.org/rfc/rfc7807.html","accessed":"2025-10-26"}]

rest-api-designer

このリポジトリの他の Skills

このリポジトリの他の Skills

Purpose & When-To-Use

Pre-Checks

Procedure

T1: Quick REST API Design (≤2k tokens, 80% use case)

T2: Multi-Resource API with Versioning and Pagination (≤6k tokens)

T3: HATEOAS API with Advanced Patterns (≤12k tokens)

Decision Rules

Output Contract

Examples

Example 1: E-commerce API (T2 - Multi-Resource with Pagination)

Example 2: HATEOAS API with Webhooks (T3 Snippet)

Quality Gates

Resources

Purpose & When-To-Use

Pre-Checks

Procedure

T1: Quick REST API Design (≤2k tokens, 80% use case)

T2: Multi-Resource API with Versioning and Pagination (≤6k tokens)

T3: HATEOAS API with Advanced Patterns (≤12k tokens)

Decision Rules

Output Contract

Examples

Example 1: E-commerce API (T2 - Multi-Resource with Pagination)

Example 2: HATEOAS API with Webhooks (T3 Snippet)

Quality Gates

Resources