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api-design

Design contract-first APIs with OpenAPI, GraphQL SDL, and Protobuf contracts.

2|Updated Jan 16, 2026
Search Tags:#design#versioning#api#openapi#rest#graphql#protobuf
One-click install
npx skills add https://github.com/MysMon/Spec-Workflow-Toolkit --skill api-design-mysmon
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: api-design
Source: https://github.com/MysMon/Spec-Workflow-Toolkit/tree/main/skills/workflows/api-design
Command: npx skills add https://github.com/MysMon/Spec-Workflow-Toolkit --skill api-design-mysmon

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Inconsistent API contracts lead to integration delays and runtime errors. This Skill provides contract-first design guidance to align REST, GraphQL, and gRPC teams on a single, maintainable API blueprint.

Core Features & Use Cases

  • Contract-first design: define OpenAPI for REST, GraphQL SDL, and Protobuf contracts before implementation to ensure a single source of truth.
  • Consistency and versioning: establish uniform naming conventions, error formats, pagination, and deprecation strategies across all API styles.
  • Use cases: design new services, review and refactor existing specs, and migrate toward contract-driven API governance.

Quick Start

Define your API contract first and sketch initial endpoints for REST, GraphQL, or gRPC.

Frequently Asked Questions about api-design

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

FAQPage Schema
What is contract-first API design and why use it for REST, GraphQL, and gRPC?▼

Contract-first API design defines OpenAPI, GraphQL SDL, or Protobuf contracts before implementation, creating a single source of truth that aligns REST, GraphQL, and gRPC teams and prevents integration delays.

How do I standardize error handling and pagination across multiple API styles?▼

Standardize error handling and pagination by establishing uniform naming conventions and standardized error formats across REST, GraphQL, and gRPC, ensuring consistent interfaces and maintainable API blueprints.

What's the best way to version and deprecate API endpoints consistently?▼

Version and deprecate APIs consistently by applying uniform versioning guidelines and deprecation strategies across all API styles, ensuring maintainable contracts and clear communication of breaking changes.

Can I use this to review and refactor existing OpenAPI and Protobuf specs?▼

Yes, you can review and refactor existing OpenAPI and Protobuf specs by validating them against contract-first design guidelines, consistency standards, and established error handling and pagination rules.

Does contract-driven API governance work for both new services and migrations?▼

Contract-driven API governance works for designing new services and migrating existing specs, aligning REST, GraphQL, and gRPC teams on a scalable, consistent API blueprint to reduce runtime errors.

How do I start designing a scalable API contract?▼

Start designing a scalable API contract by sketching initial endpoints and defining the OpenAPI, GraphQL SDL, or Protobuf contract first, ensuring a single source of truth before implementation.

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