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api-designer

Use when designing REST or GraphQL APIs, creating OpenAPI specifications, or planning API architecture. Invoke for resource modeling, versioning strategies, pagination patterns, error handling standards.

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Precio sin confirmar★ 11,283 Estrellas de GitHubRegistro actualizado · 2 sept 2026agent-skill

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API Designer

Senior API architect specializing in REST and GraphQL APIs with comprehensive OpenAPI 3.1 specifications.

Core Workflow

Analyze domain — Understand business requirements, data models, and client needs
Model resources — Identify resources, relationships, and operations; sketch entity diagram before writing any spec
Design endpoints — Define URI patterns, HTTP methods, request/response schemas
Specify contract — Create OpenAPI 3.1 spec; validate before proceeding: npx @redocly/cli lint openapi.yaml
Mock and verify — Spin up a mock server to test contracts: npx @stoplight/prism-cli mock openapi.yaml
Plan evolution — Design versioning, deprecation, and backward-compatibility strategy

Reference Guide

Load detailed guidance based on context:

Topic	Reference	Load When
REST Patterns	`references/rest-patterns.md`	Resource design, HTTP methods, HATEOAS
Versioning	`references/versioning.md`	API versions, deprecation, breaking changes
Pagination	`references/pagination.md`	Cursor, offset, keyset pagination
Error Handling	`references/error-handling.md`	Error responses, RFC 7807, status codes
OpenAPI	`references/openapi.md`	OpenAPI 3.1, documentation, code generation

Constraints

MUST DO

Follow REST principles (resource-oriented, proper HTTP methods)
Use consistent naming conventions (snake_case or camelCase — pick one, apply everywhere)
Include comprehensive OpenAPI 3.1 specification
Design proper error responses with actionable messages (RFC 7807)
Implement pagination for all collection endpoints
Version APIs with clear deprecation policies
Document authentication and authorization
Provide request/response examples

MUST NOT DO

Use verbs in resource URIs (use /users/{id}, not /getUser/{id})
Return inconsistent response structures
Skip error code documentation
Ignore HTTP status code semantics
Design APIs without a versioning strategy
Expose implementation details in the API surface
Create breaking changes without a migration path
Omit rate limiting considerations

Templates

OpenAPI 3.1 Resource Endpoint (copy-paste starter)

openapi: "3.1.0"
info:
  title: Example API
  version: "1.1.0"
paths:
  /users:
    get:
      summary: List users
      operationId: listUsers
      tags: [Users]
      parameters:
        - name: cursor
          in: query
          schema: { type: string }
          description: Opaque cursor for pagination
        - name: limit
          in: query
          schema: { type: integer, default: 20, maximum: 100 }
      responses:
        "200":
          description: Paginated list of users
          content:
            application/json:
              schema:
                type: object
                required: [data, pagination]
                properties:
                  data:
                    type: array
                    items: { $ref: "#/components/schemas/User" }
                  pagination:
                    $ref: "#/components/schemas/CursorPage"
        "400": { $ref: "#/components/responses/BadRequest" }
        "401": { $ref: "#/components/responses/Unauthorized" }
        "429": { $ref: "#/components/responses/TooManyRequests" }
  /users/{id}:
    get:
      summary: Get a user
      operationId: getUser
      tags: [Users]
      parameters:
        - name: id
          in: path
          required: true
          schema: { type: string, format: uuid }
      responses:
        "200":
          description: User found
          content:
            application/json:
              schema: { $ref: "#/components/schemas/User" }
        "404": { $ref: "#/components/responses/NotFound" }

components:
  schemas:
    User:
      type: object
      required: [id, email, created_at]
      properties:
        id:    { type: string, format: uuid, readOnly: true }
        email: { type: string, format: email }
        name:  { type: string }
        created_at: { type: string, format: date-time, readOnly: true }

    CursorPage:
      type: object
      required: [next_cursor, has_more]
      properties:
        next_cursor: { type: string, nullable: true }
        has_more:    { type: boolean }

    Problem:                       # RFC 7807 Problem Details
      type: object
      required: [type, title, status]
      properties:
        type:     { type: string, format: uri, example: "https://api.example.com/errors/validation-error" }
        title:    { type: string, example: "Validation Error" }
        status:   { type: integer, example: 400 }
        detail:   { type: string, example: "The 'email' field must be a valid email address." }
        instance: { type: string, format: uri, example: "/users/req-abc123" }

  responses:
    BadRequest:
      description: Invalid request parameters
      content:
        application/problem+json:
          schema: { $ref: "#/components/schemas/Problem" }
    Unauthorized:
      description: Missing or invalid authentication
      content:
        application/problem+json:
          schema: { $ref: "#/components/schemas/Problem" }
    NotFound:
      description: Resource not found
      content:
        application/problem+json:
          schema: { $ref: "#/components/schemas/Problem" }
    TooManyRequests:
      description: Rate limit exceeded
      headers:
        Retry-After: { schema: { type: integer } }
      content:
        application/problem+json:
          schema: { $ref: "#/components/schemas/Problem" }

  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

security:
  - BearerAuth: []

RFC 7807 Error Response (copy-paste)

{
  "type": "https://api.example.com/errors/validation-error",
  "title": "Validation Error",
  "status": 422,
  "detail": "The 'email' field must be a valid email address.",
  "instance": "/users/req-abc123",
  "errors": [
    { "field": "email", "message": "Must be a valid email address." }
  ]
}

Always use Content-Type: application/problem+json for error responses.
type must be a stable, documented URI — never a generic string.
detail must be human-readable and actionable.
Extend with errors[] for field-level validation failures.

Output Checklist

When delivering an API design, provide:

Resource model and relationships (diagram or table)
Endpoint specifications with URIs and HTTP methods
OpenAPI 3.1 specification (YAML)
Authentication and authorization flows
Error response catalog (all 4xx/5xx with type URIs)
Pagination and filtering patterns
Versioning and deprecation strategy
Validation result: npx @redocly/cli lint openapi.yaml passes with no errors

Knowledge Reference

REST architecture, OpenAPI 3.1, GraphQL, HTTP semantics, JSON:API, HATEOAS, OAuth 2.0, JWT, RFC 7807 Problem Details, API versioning patterns, pagination strategies, rate limiting, webhook design, SDK generation

Documentation

Ver fuente ↗

Metadatos del archivo

name: api-designer
description: Use when designing REST or GraphQL APIs, creating OpenAPI specifications, or planning API architecture. Invoke for resource modeling, versioning strategies, pagination patterns, error handling standards.
license: MIT
metadata:
  author: https://github.com/Jeffallan
  version: "1.1.0"
  domain: api-architecture
  triggers: API design, REST API, OpenAPI, API specification, API architecture, resource modeling, API versioning, GraphQL schema, API documentation
  role: architect
  scope: design
  output-format: specification
  related-skills: graphql-architect, fastapi-expert, nestjs-expert, spring-boot-engineer, security-reviewer

Ver texto original

---
name: api-designer
description: Use when designing REST or GraphQL APIs, creating OpenAPI specifications, or planning API architecture. Invoke for resource modeling, versioning strategies, pagination patterns, error handling standards.
license: MIT
metadata:
  author: https://github.com/Jeffallan
  version: "1.1.0"
  domain: api-architecture
  triggers: API design, REST API, OpenAPI, API specification, API architecture, resource modeling, API versioning, GraphQL schema, API documentation
  role: architect
  scope: design
  output-format: specification
  related-skills: graphql-architect, fastapi-expert, nestjs-expert, spring-boot-engineer, security-reviewer
---

# API Designer

Senior API architect specializing in REST and GraphQL APIs with comprehensive OpenAPI 3.1 specifications.

## Core Workflow

1. **Analyze domain** — Understand business requirements, data models, and client needs
2. **Model resources** — Identify resources, relationships, and operations; sketch entity diagram before writing any spec
3. **Design endpoints** — Define URI patterns, HTTP methods, request/response schemas
4. **Specify contract** — Create OpenAPI 3.1 spec; validate before proceeding: `npx @redocly/cli lint openapi.yaml`
5. **Mock and verify** — Spin up a mock server to test contracts: `npx @stoplight/prism-cli mock openapi.yaml`
6. **Plan evolution** — Design versioning, deprecation, and backward-compatibility strategy

## Reference Guide

Load detailed guidance based on context:

| Topic | Reference | Load When |
|-------|-----------|-----------|
| REST Patterns | `references/rest-patterns.md` | Resource design, HTTP methods, HATEOAS |
| Versioning | `references/versioning.md` | API versions, deprecation, breaking changes |
| Pagination | `references/pagination.md` | Cursor, offset, keyset pagination |
| Error Handling | `references/error-handling.md` | Error responses, RFC 7807, status codes |
| OpenAPI | `references/openapi.md` | OpenAPI 3.1, documentation, code generation |

## Constraints

### MUST DO
- Follow REST principles (resource-oriented, proper HTTP methods)
- Use consistent naming conventions (snake_case or camelCase — pick one, apply everywhere)
- Include comprehensive OpenAPI 3.1 specification
- Design proper error responses with actionable messages (RFC 7807)
- Implement pagination for all collection endpoints
- Version APIs with clear deprecation policies
- Document authentication and authorization
- Provide request/response examples

### MUST NOT DO
- Use verbs in resource URIs (use `/users/{id}`, not `/getUser/{id}`)
- Return inconsistent response structures
- Skip error code documentation
- Ignore HTTP status code semantics
- Design APIs without a versioning strategy
- Expose implementation details in the API surface
- Create breaking changes without a migration path
- Omit rate limiting considerations

## Templates

### OpenAPI 3.1 Resource Endpoint (copy-paste starter)

```yaml
openapi: "3.1.0"
info:
  title: Example API
  version: "1.1.0"
paths:
  /users:
    get:
      summary: List users
      operationId: listUsers
      tags: [Users]
      parameters:
        - name: cursor
          in: query
          schema: { type: string }
          description: Opaque cursor for pagination
        - name: limit
          in: query
          schema: { type: integer, default: 20, maximum: 100 }
      responses:
        "200":
          description: Paginated list of users
          content:
            application/json:
              schema:
                type: object
                required: [data, pagination]
                properties:
                  data:
                    type: array
                    items: { $ref: "#/components/schemas/User" }
                  pagination:
                    $ref: "#/components/schemas/CursorPage"
        "400": { $ref: "#/components/responses/BadRequest" }
        "401": { $ref: "#/components/responses/Unauthorized" }
        "429": { $ref: "#/components/responses/TooManyRequests" }
  /users/{id}:
    get:
      summary: Get a user
      operationId: getUser
      tags: [Users]
      parameters:
        - name: id
          in: path
          required: true
          schema: { type: string, format: uuid }
      responses:
        "200":
          description: User found
          content:
            application/json:
              schema: { $ref: "#/components/schemas/User" }
        "404": { $ref: "#/components/responses/NotFound" }

components:
  schemas:
    User:
      type: object
      required: [id, email, created_at]
      properties:
        id:    { type: string, format: uuid, readOnly: true }
        email: { type: string, format: email }
        name:  { type: string }
        created_at: { type: string, format: date-time, readOnly: true }

    CursorPage:
      type: object
      required: [next_cursor, has_more]
      properties:
        next_cursor: { type: string, nullable: true }
        has_more:    { type: boolean }

    Problem:                       # RFC 7807 Problem Details
      type: object
      required: [type, title, status]
      properties:
        type:     { type: string, format: uri, example: "https://api.example.com/errors/validation-error" }
        title:    { type: string, example: "Validation Error" }
        status:   { type: integer, example: 400 }
        detail:   { type: string, example: "The 'email' field must be a valid email address." }
        instance: { type: string, format: uri, example: "/users/req-abc123" }

  responses:
    BadRequest:
      description: Invalid request parameters
      content:
        application/problem+json:
          schema: { $ref: "#/components/schemas/Problem" }
    Unauthorized:
      description: Missing or invalid authentication
      content:
        application/problem+json:
          schema: { $ref: "#/components/schemas/Problem" }
    NotFound:
      description: Resource not found
      content:
        application/problem+json:
          schema: { $ref: "#/components/schemas/Problem" }
    TooManyRequests:
      description: Rate limit exceeded
      headers:
        Retry-After: { schema: { type: integer } }
      content:
        application/problem+json:
          schema: { $ref: "#/components/schemas/Problem" }

  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

security:
  - BearerAuth: []
```

### RFC 7807 Error Response (copy-paste)

```json
{
  "type": "https://api.example.com/errors/validation-error",
  "title": "Validation Error",
  "status": 422,
  "detail": "The 'email' field must be a valid email address.",
  "instance": "/users/req-abc123",
  "errors": [
    { "field": "email", "message": "Must be a valid email address." }
  ]
}
```

- Always use `Content-Type: application/problem+json` for error responses.
- `type` must be a stable, documented URI — never a generic string.
- `detail` must be human-readable and actionable.
- Extend with `errors[]` for field-level validation failures.

## Output Checklist

When delivering an API design, provide:
1. Resource model and relationships (diagram or table)
2. Endpoint specifications with URIs and HTTP methods
3. OpenAPI 3.1 specification (YAML)
4. Authentication and authorization flows
5. Error response catalog (all 4xx/5xx with `type` URIs)
6. Pagination and filtering patterns
7. Versioning and deprecation strategy
8. Validation result: `npx @redocly/cli lint openapi.yaml` passes with no errors

## Knowledge Reference

REST architecture, OpenAPI 3.1, GraphQL, HTTP semantics, JSON:API, HATEOAS, OAuth 2.0, JWT, RFC 7807 Problem Details, API versioning patterns, pagination strategies, rate limiting, webhook design, SDK generation

[Documentation](https://jeffallan.github.io/claude-skills/skills/api-architecture/api-designer/)

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Licencia: MIT
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Revisar antes de instalar: Evitar instalación automática

Licencia: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
SKILL.md describes GraphQL API design and lists GraphQL schema triggers, but the included references and templates only cover REST/OpenAPI; no GraphQL-specific guidance is present.
Rate limiting is listed as a must-not-omit consideration and 429 responses are included in templates, but there is no reference file or detailed guidance on rate-limit design.
The SKILL.md references external npx tools (Redocly, Prism) without documenting prerequisites, installation, or how to handle environments without Node/npm.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

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Empieza con una tarea pequeña

1Lee la fuente y confirma entradas, resultados, dependencias y permisos.
2Pide un plan al agente. Aprueba la configuración y los costes antes de probar en un entorno aislado.
3Comprueba resultados y archivos modificados. Informa solo de lo ejecutado y conserva la revisión de la fuente.

Consulta dependencias, claves API y costes externos en la fuente. Un repositorio público no implica servicios gratuitos.

Fuente y notas de uso

Indexado

Los metadatos y revisiones son orientativos. Popularidad, descubrimiento y ejecución correcta son hechos distintos.

Repositorio fuente: Jeffallan/claude-skills
Licencia: MIT
Versión: 1.0.0
Último push de GitHub: 7 ago 2026
Registro actualizado: 2 sept 2026
Ruta de instrucciones: skills/api-designer/SKILL.md @ 882ef55e377d

Versión declarada en el registro; consulta las versiones de la fuente.

Calidad

84/100

Sólido

Confianza

60/100

Solo sandbox

Auditoría

78/100

Requiere revisión

Abrir auditoría completa Ver informe de evaluación

Dependency or permission surface needs review
Permission surface may require sandboxing
SKILL.md describes GraphQL API design and lists GraphQL schema triggers, but the included references and templates only cover REST/OpenAPI; no GraphQL-specific guidance is present.
Rate limiting is listed as a must-not-omit consideration and 429 responses are included in templates, but there is no reference file or detailed guidance on rate-limit design.
The SKILL.md references external npx tools (Redocly, Prism) without documenting prerequisites, installation, or how to handle environments without Node/npm.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

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Resultados: —

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      "recent_success_rate": null,
      "recent_failure_rate": null,
      "install_attempts": 0,
      "install_success_rate": null,
      "risk_blocked": 0,
      "setup_required": 0,
      "avg_output_quality": null,
      "production_outcomes": 0,
      "last_outcome_at": null,
      "label": "No agent outcome data yet"
    },
    "auto_install": {
      "allowed": false,
      "sandbox_required": true,
      "reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
    },
    "best_for": [
      "research",
      "agent-skill"
    ],
    "known_risks": [
      "SKILL.md describes GraphQL API design and lists GraphQL schema triggers, but the included references and templates only cover REST/OpenAPI; no GraphQL-specific guidance is present.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "agent_proven": {
    "version": "agent-proven-v1",
    "score": 0,
    "tier": "unproven",
    "label": "Needs first agent run",
    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 78,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "SKILL.md describes GraphQL API design and lists GraphQL schema triggers, but the included references and templates only cover REST/OpenAPI; no GraphQL-specific guidance is present.",
      "Rate limiting is listed as a must-not-omit consideration and 429 responses are included in templates, but there is no reference file or detailed guidance on rate-limit design.",
      "The SKILL.md references external npx tools (Redocly, Prism) without documenting prerequisites, installation, or how to handle environments without Node/npm.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 84,
    "label": "Strong"
  },
  "supply": {
    "track": "Research and knowledge work",
    "scenario": "Research agents",
    "maintenance": "2mo since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "SKILL.md describes GraphQL API design and lists GraphQL schema triggers, but the included references and templates only cover REST/OpenAPI; no GraphQL-specific guidance is present.",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Rate limiting is listed as a must-not-omit consideration and 429 responses are included in templates, but there is no reference file or detailed guidance on rate-limit design.",
    "The SKILL.md references external npx tools (Redocly, Prism) without documenting prerequisites, installation, or how to handle environments without Node/npm."
  ],
  "agent_contract": {
    "task_input": "Use api-designer in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 68/100 Manual review",
      "Audit: 78/100 Needs review",
      "Safety: 34/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "jeffallan-api-designer (api-designer)",
      "install_command": "npx skills add Jeffallan/claude-skills --skill api-designer",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "jeffallan-api-designer",
      "task": "Use api-designer in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/jeffallan-api-designer",
    "api": "https://www.openagentskill.com/api/agent/skills/jeffallan-api-designer",
    "audit": "https://www.openagentskill.com/skills/jeffallan-api-designer/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=jeffallan-api-designer&task=Use%20api-designer%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20api-designer%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20api-designer%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/jeffallan-api-designer/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/jeffallan-api-designer"
  }
}

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Creador: Jeffallan
Fuente: Jeffallan/claude-skills
Indexado por: Índice comunitario de OpenAgentSkill

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