claudegoodies
Skill

openapi-spec-generation

From wshobson

Generate and maintain OpenAPI 3.1 specifications from code, design-first specs, and validation patterns. Use when creating API documentation, generating SDKs, or ensuring API contract compliance.

Facts

Repository
wshobson/agents
Status
Actively maintained
Last commit
Source file
plugins/documentation-generation/skills/openapi-spec-generation/SKILL.md

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The instructions Claude Code reads when this skill runs.

# OpenAPI Spec Generation

Comprehensive patterns for creating, maintaining, and validating OpenAPI 3.1 specifications for RESTful APIs.

## When to Use This Skill

- Creating API documentation from scratch
- Generating OpenAPI specs from existing code
- Designing API contracts (design-first approach)
- Validating API implementations against specs
- Generating client SDKs from specs
- Setting up API documentation portals

## Core Concepts

### 1. OpenAPI 3.1 Structure

```yaml
openapi: 3.1.0
info:
  title: API Title
  version: 1.0.0
servers:
  - url: https://api.example.com/v1
paths:
  /resources:
    get: ...
components:
  schemas: ...
  securitySchemes: ...
```

### 2. Design Approaches

| Approach         | Description                  | Best For            |
| ---------------- | ---------------------------- | ------------------- |
| **Design-First** | Write spec before code       | New APIs, contracts |
| **Code-First**   | Generate spec from code      | Existing APIs       |
| **Hybrid**       | Annotate code, generate spec | Evolving APIs       |

## Templates and detailed worked examples

Full template library and detailed worked examples live in `references/details.md`. Read that file when you need the concrete templates.

## Best Practices

### Do's

- **Use $ref** - Reuse schemas, parameters, responses
- **Add examples** - Real-world values help consumers
- **Document
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