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api-and-interface-design

Design and audit observable public API contracts with compatibility strategies.

Updated Jun 4, 2026
Search Tags:#design#api#validation#backward-compatibility#contract#interface
One-click install
npx skills add https://github.com/zxyycom/docnav --skill api-and-interface-design-zxyycom
Or copy as Structured Prompt for Agentโ–ผ
Please help me install this Agent Skill.
Skill: api-and-interface-design
Source: https://github.com/zxyycom/docnav/tree/main/.codex/skills/api-and-interface-design
Command: npx skills add https://github.com/zxyycom/docnav --skill api-and-interface-design-zxyycom

SYSTEM DOCUMENTATION & REQUIREMENTS

๐Ÿ’ก This Skill includes references (resource) components.

What problem does it solve?

Enables teams to design and audit observable public contracts for APIs and interfaces, ensuring stable, well-defined boundaries between systems and tools.

Core Features & Use Cases

  • Surface contract surfaces: machine-readable protocol, readable output, opaque ref/identifier, pagination, schema/example, error mapping, and CLI/API surface.
  • Ownership and compatibility guidance: map owning layer (core, adapter/service, bridge/tool, docs) and promote additive, non-breaking evolution with migration notes.
  • Validation and governance: ensure that schema, examples, fixtures, tests, and docs reflect observable behavior and support cross-layer mapping.
  • Use Case: craft a contract-first spec for a new service, so downstream adapters and clients can evolve without breaking existing integrations.

Quick Start

Draft a contract-first specification for a new API surface including the observable fields, ref/identifier, and a plan for backward-compatible changes.

Frequently Asked Questions about api-and-interface-design

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

FAQPage Schema
How do I design an API contract that prevents breaking existing integrations?โ–ผ

To design a backward-compatible API contract, map owning layers across core, adapter, and tooling boundaries, enforce contract-first governance, and promote additive, non-breaking evolution with clear migration notes.

What should be included in an observable API contract specification?โ–ผ

An observable API contract specification must include machine-readable protocol surfaces, opaque ref/identifiers, pagination, schema/examples, error mapping, and clear CLI/API boundaries to ensure stable system integration.

When do I need a contract-first API design approach?โ–ผ

You need a contract-first API design approach when crafting a new service surface, ensuring downstream adapters and clients can evolve without breaking existing integrations through stable identifiers and enforced compatibility.

How do I validate API schemas and examples against observable behavior?โ–ผ

To validate API schemas and examples against observable behavior, ensure that fixtures, tests, and docs reflect the contract surfaces and support cross-layer mapping between core, adapter, and tooling boundaries.

Can I use contract-first governance for existing API interfaces?โ–ผ

Yes, you can audit existing API interfaces by mapping ownership layers, enforcing backward compatibility strategies, and validating that current schemas, error mappings, and pagination semantics align with observable behavior.

What is the best way to manage API evolution without breaking downstream adapters?โ–ผ

The best way to manage API evolution without breaking downstream adapters is to promote additive, non-breaking changes with migration notes, maintaining stable identifiers and clear error semantics across all contract surfaces.

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