How does the skill handle external dependencies like databases?

It uses a stub pattern to simulate database interactions, storing data in memory or localStorage and returning realistic responses with simulated network delays.

Can I use my own specific tech stack?

Yes. The skill analyzes your current project or asks for a preferred tech stack during the PRD analysis phase to ensure the prototype matches your environment.

What is a functional prototype in the context of Claude Code?

A functional prototype is a working, interactive demo that uses mock data and stubbed APIs to simulate real application behavior, allowing you to validate user flows without a live backend.

Can I convert the prototype into a real application later?

Absolutely. After building the prototype, you can ask the skill to generate an integration guide that documents exactly how to replace the stubs with real production implementations.

Functional Prototype Builder

Name: Functional Prototype Builder
Author: Porkbutts

byPorkbutts

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Design Tools

Builds interactive, clickable prototypes from Product Requirement Documents using realistic mock data and stubbed API layers.

The Functional Prototype Builder streamlines the transition from conceptual requirements to interactive code by transforming PRDs or feature specs into fully navigable demos. It automates the creation of mock data structures, simulates asynchronous API interactions with realistic latency, and implements user-facing flows to validate UI/UX concepts before final implementation. This skill is specifically designed for rapid validation, allowing developers to demonstrate complex workflows and state transitions without waiting for backend development.

Key Features

01Asynchronous stub layer simulating real-world API latency and behavior

02Automated PRD analysis to extract user stories and data entities

03Realistic mock data generation covering edge cases and empty states

04Post-prototype integration guides for production-ready migration

05Full multi-screen UI implementation with functional navigation

061 GitHub stars

Use Cases

01Transforming a text-based PRD into a functional proof-of-concept during vibecoding sessions

02Validating frontend UI/UX flows while backend services are still in development

03Rapidly building a clickable demo for stakeholder feedback or user testing

Key Features

01Asynchronous stub layer simulating real-world API latency and behavior

02Automated PRD analysis to extract user stories and data entities

03Realistic mock data generation covering edge cases and empty states

04Post-prototype integration guides for production-ready migration

05Full multi-screen UI implementation with functional navigation

061 GitHub stars

Use Cases

01Transforming a text-based PRD into a functional proof-of-concept during vibecoding sessions

02Validating frontend UI/UX flows while backend services are still in development

03Rapidly building a clickable demo for stakeholder feedback or user testing