backend-api-contract

Designs implementable API contracts for REST, GraphQL, or RPC services.

6|Updated Apr 24, 2026

Search Tags:#design #api #openapi #specification #backend #graphql #contracts

Ready to run

npx skills add https://github.com/lookatitude/guild --skill backend-api-contract-lookatitude

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: backend-api-contract
Source: https://github.com/lookatitude/guild/tree/main/skills/specialists/backend-api-contract
Command: npx skills add https://github.com/lookatitude/guild --skill backend-api-contract-lookatitude

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Backend API contracts that are precise and implementable, ensuring alignment between clients and services and reducing integration ambiguity.

Core Features & Use Cases

Precise endpoint contracts for REST, GraphQL, or RPC boundaries.
Standardized request/response schemas, error envelopes, and auth expectations.
Clear versioning and pagination rules to enable safe evolution.

Quick Start

Provide a concrete contract for a single service boundary, including endpoints, schemas, and versioning.

Frequently Asked Questions about backend-api-contract

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

FAQPage Schema

How do I define an API contract for a backend service boundary?▼

To define an API contract, you specify precise endpoints, request/response schemas, error envelopes, auth, versioning, and pagination rules. This ensures alignment between clients and services, reducing integration ambiguity across REST, GraphQL, or RPC boundaries.

What is the best way to standardize error envelopes and auth expectations in API specifications?▼

Standardizing error envelopes and auth expectations involves defining precise contract schemas for your API specifications. This process specifies auth expectations and error formats uniformly, ensuring implementable backend service boundaries and safe API evolution.

Can I use a single API contract for both REST and GraphQL service boundaries?▼

Yes, you can define precise API contracts for a single resource or service boundary across REST, GraphQL, or RPC. The contract specifies endpoints, request/response shapes, and pagination rules regardless of the chosen protocol.

How do I handle versioning and pagination rules when designing backend APIs?▼

Handling versioning and pagination rules requires defining clear API contract strategies for your backend. Specifying these rules within the contract enables safe API evolution and standardized data retrieval across service boundaries.

Why do I need idempotency guidance in my API specification?▼

Idempotency guidance in an API specification ensures that repeated requests produce the same result without unintended side effects. Including this guidance within your precise backend contract reduces integration ambiguity and improves client-service alignment.