API Contract Generator

Generate OpenAPI 3.0+ specifications from FSDs and ERDs.

Updated Mar 4, 2026

Search Tags:#API design #OpenAPI #Swagger #contract-first #specification generator

Ready to run

npx skills add https://github.com/hfadhlullah/gitarpro --skill api-contract-generator

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: API Contract Generator
Source: https://github.com/hfadhlullah/gitarpro/tree/main/.agents/skills/api-contract-generator
Command: npx skills add https://github.com/hfadhlullah/gitarpro --skill api-contract-generator

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the need for precise API contracts that facilitate clear communication between frontend and backend teams and ensure robust API design.

Core Features & Use Cases

API Contract Creation: Automatically generate OpenAPI 3.0+ specifications from FSDs and ERDs.
Design & Documentation: Facilitate contract-first API design and Swagger documentation.
Use Case: A Senior API Architect uses this Skill to create a production-ready OpenAPI 3.0+ specification based on business logic (FSD) and data models (ERD).

Quick Start

Run the skill with the command "generate API contract from 'business_logic.docx' and 'data_model.erdb'".

Frequently Asked Questions about API Contract Generator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I generate OpenAPI specifications from functional and data model documents?▼

To generate OpenAPI specifications, provide your Functional Specifications Documents and Entity Relationship Diagrams. The skill translates these business logic and data models into accurate API contracts for seamless design.

What is contract-first API design and when do I need it?▼

Contract-first API design defines your OpenAPI specification before writing code, aligning frontend and backend interfaces. You need it to establish precise API contracts that facilitate clear communication across teams.

Can I create Swagger documentation from an ERD and FSD?▼

Yes, you can create Swagger documentation from an ERD and FSD. The skill automatically translates your Entity Relationship Diagrams and Functional Specifications Documents into comprehensive Swagger-compatible API specifications.

What do I need to start generating API contracts from business logic?▼

To start generating API contracts, you need ready-to-use Functional Specifications Documents and Entity Relationship Diagrams. These documents provide the necessary business logic and data models for accurate contract generation.

Does this approach support OpenAPI 3.0 for production-ready API design?▼

Yes, this approach supports OpenAPI 3.0 and above for production-ready API design. It automatically generates comprehensive specifications from your provided business logic and data models to ensure robust interfaces.

Why generate an OpenAPI contract before building backend endpoints?▼

Generating an OpenAPI contract before building endpoints ensures robust API design and documentation. It aligns frontend and backend teams by establishing a precise, shared specification derived from business requirements.