openapi-spec-generation
Makes your agent generate and update technical documents for APIs. It helps ensure documentation is always correct and complete.
What it does
This tool helps create and manage technical documents called OpenAPI specifications. These specifications describe how APIs (Application Programming Interfaces) work, making it easier for different software to communicate.
When to use it
- ✓When creating API documentation from scratch.
- ✓When generating API documentation from existing code.
- ✓When defining how an API should behave before writing it (design-first approach).
Example of what to ask your AI
“Generate the OpenAPI specification for an API that manages user tasks, allowing for creating, reading, updating, and deleting tasks.”
Want more? Open the sections below.
How to use
The easiest way: copy the message below and paste it into Claude, ChatGPT, Cursor or any AI. It reads the skill and follows the instructions.
Skill link
Ready-to-paste message
How it works
The tool analyzes your code or design ideas to create an OpenAPI specification file. This file acts as a detailed map of your API, explaining its commands and responses.
Installation
Easiest way: copy the skill link and paste it into Claude, ChatGPT or Cursor asking it to follow the instructions.
In the terminal (Claude Code, Codex, Cursor), in your project folder:
npx skills add sickn33/agentic-awesome-skills --skill openapi-spec-generationOr download just the file:
curl -L https://raw.githubusercontent.com/sickn33/agentic-awesome-skills/main/plugins/agentic-awesome-skills-claude/skills/openapi-spec-generation/SKILL.md -o SKILL.mdTechnical content (original SKILL.md)
Original text by the author, straight from GitHub.
OpenAPI Spec Generation
Comprehensive patterns for creating, maintaining, and validating OpenAPI 3.1 specifications for RESTful APIs.
Use this skill when
- 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
Do not use this skill when
- The task is unrelated to openapi spec generation
- You need a different domain or tool outside this scope
Instructions
- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
- If detailed examples are required, open
resources/implementation-playbook.md.
Resources
resources/implementation-playbook.mdfor detailed patterns and examples.
Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
FAQ
What is an OpenAPI specification?
It's a standardized document that describes a RESTful API, detailing its endpoints, methods (GET, POST, etc.), parameters, responses, and data models.
What is the purpose of an OpenAPI specification?
It serves as a contract between the API client and server, aids in automatic documentation generation, client code (SDKs) creation, and API implementation validation.
What's the difference between 'design-first' and 'code-first'?
In 'design-first', you create the OpenAPI specification first and then develop the API based on it. In 'code-first', you write the API code first and then generate the specification from it.
Details
Original description by the author
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.
Popularity
- GitHub stars
- 48k
- Ranking position
- #3762
- License
- MIT
- Updated
- 10/15/2026
Comments
- …
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