openapi-spec-generation
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.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/wshobson/agents --skill openapi-spec-generation- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads openapi-spec-generation automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
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
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 errors - All possible error codes
- Version your API - In URL or header
- Use semantic versioning - For spec changes
Don'ts
- Don't use generic descriptions - Be specific
- Don't skip security - Define all schemes
- Don't forget nullable - Be explicit about null
- Don't mix styles - Consistent naming throughout
- Don't hardcode URLs - Use server variables
FAQ
What does the openapi-spec-generation skill do?
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.
How do I install openapi-spec-generation?
Run npx skills add https://github.com/wshobson/agents --skill openapi-spec-generation in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/openapi-spec-generation/ (personal) or .claude/skills/openapi-spec-generation/ (project).
Which AI agents can use openapi-spec-generation?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is openapi-spec-generation safe to install?
Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains openapi-spec-generation?
It is published by wshobson in wshobson/agents. It has 16,562 recorded installs.
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