openapi-generator

OpenAPI Generator Skill

Generates OpenAPI specifications from code annotations, legacy APIs, or runtime analysis, with schema inference and documentation generation.

Purpose

Enable API documentation for:

• Spec generation from code
• Schema inference
• Example generation
• Validation rule extraction
• Documentation generation

Capabilities

1. Spec Generation from Code Annotations

• Parse JSDoc/Swagger annotations
• Extract from decorators
• Process code comments
• Support multiple languages

2. Schema Inference

• Infer from TypeScript types
• Extract from runtime samples
• Build from database models
• Derive from existing payloads

3. Example Generation

• Generate realistic examples
• Create edge case samples
• Produce validation examples
• Build test fixtures

4. Validation Rule Extraction

• Extract validation constraints
• Document required fields
• Map format rules
• Export enum values

5. Versioning Support

• Track API versions
• Generate diff between versions
• Document breaking changes
• Support multiple versions

6. Documentation Generation

• Generate Swagger UI
• Create ReDoc pages
• Export to Postman
• Build developer portals

Tool Integrations

| Tool | Language | Integration Method |

|------|----------|-------------------|

| Swagger Codegen | Multi | CLI |

| OpenAPI Generator | Multi | CLI |

| springdoc | Java/Spring | Library |

| NSwag | .NET | CLI |

| tsoa | TypeScript | CLI |

| FastAPI | Python | Auto |

Output Schema

{
  "generationId": "string",
  "timestamp": "ISO8601",
  "specification": {
    "openapi": "string",
    "info": {},
    "paths": {},
    "components": {}
  },
  "artifacts": {
    "specFile": "string",
    "docsUrl": "string",
    "postmanCollection": "string"
  },
  "coverage": {
    "endpoints": "number",
    "documented": "number",
    "schemasGenerated": "number"
  }
}

Integration with Migration Processes

• api-modernization: Spec generation
• documentation-migration: API docs

Related Skills

• api-inventory-scanner: Endpoint discovery
• api-compatibility-analyzer: Version comparison

Related Agents

• api-modernization-architect: API design
• documentation-migration-agent: Doc generation