skills.rest
Handy369
Handy369COMMUNITY
Explore all skills by this author →
GitHub

api-and-interface-design

Define contract shapes and boundary semantics for API and module interfaces before coding.

Updated Apr 27, 2026
Search Tags:#validation#api contract#error semantics#contract tests#type boundaries#module interface
One-click install
npx skills add https://github.com/Handy369/passto-pi-frame --skill api-and-interface-design-handy369
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: api-and-interface-design
Source: https://github.com/Handy369/passto-pi-frame/tree/main/skills/api-and-interface-design
Command: npx skills add https://github.com/Handy369/passto-pi-frame --skill api-and-interface-design-handy369

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It prevents interface drift and inconsistent error/shape semantics by forcing contract definition and boundary validation before implementation work begins.

Core Features & Use Cases

  • Contract-first alignment: Define input/output/error semantics, ownership, and trust boundaries early, then update implementation to match.
  • Boundary risk containment: Focus on typed boundaries such as API endpoints, module contracts, and component props shape to stop internal details from leaking externally.
  • Proof-driven convergence: Produce contract-aligned evidence such as type constraints, contract tests, or consumer-call alignment to ensure the boundary is actually stable.

Quick Start

Use this skill when the primary risk is API endpoint behavior, request/response shape, module contract, or typed component props boundaries that must be reconciled before writing the implementation.

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 prevent API contract drift before starting implementation?▼

To prevent API contract drift, define explicit input, output, and error semantics alongside ownership boundaries before coding. This stabilizes endpoint behavior and request/response shapes early, ensuring implementation aligns with the agreed interface.

What is the best way to define module interface boundaries and stop internal details from leaking?▼

Defining module interface boundaries involves establishing typed contracts and validation rules at the edges. This contains boundary risk by stopping internal implementation details from leaking externally through API endpoints or component props.

How do I validate API error semantics and request response shapes?▼

Validate API error semantics and request response shapes by producing contract-aligned evidence such as type constraints and contract tests. This proof-driven convergence verifies the boundary is stable and matches the defined semantics.

When do I need to define contract shapes for component props and module contracts?▼

Define contract shapes for component props and module contracts when implementation risk concentrates at typed boundaries. Reconciling these boundaries before writing implementation prevents inconsistent shape semantics and interface drift.

Does this contract-first approach work for typed boundaries and component props validation?▼

Yes, contract-first design applies directly to typed boundaries including API endpoints, module contracts, and component props validation. It forces explicit boundary decisions and trust rules before implementation work begins.

Related Skills

Explore More Software Engineering Skills→
BurburtonBurburton

interface-contract-design

Define precise input/output contracts for REST and gRPC API boundaries.

Community
Advanced
qdzshqdzsh
12

api-design

Design HTTP or GraphQL API contracts with endpoints, methods, and error models.

Community
Advanced
billydeeii136billydeeii136

health

Compute a weighted 0-10 codebase health score and track trends over time.

Community
Intermediate
nq-rdlnq-rdl

zod

Validate runtime data and infer TypeScript types with Zod schemas.

Official
Intermediate