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api-and-interface-design - API and Interface Design

Guides stable API and interface design for endpoints, module boundaries, and public contracts.

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Updated: 2026-09-23

Capabilities

Typical Inputs

Typical Outputs

What this skill does

Define interface contracts first
Validate data at system boundaries
Design REST API endpoints
Use discriminated unions for variants
Separate input and output types

Inputs

API requirements
Database schema definitions
External service responses

Outputs

TypeScript interface definitions
REST endpoint specifications
Structured error response shapes

Requirements

Source

Spec: SKILL.md

interface-design

Define interface contracts first

Validate data at system boundaries

Design REST API endpoints

Use discriminated unions for variants

API requirements

Database schema definitions

External service responses

TypeScript interface definitions

REST endpoint specifications

Structured error response shapes