What platforms does this skill support?

This skill orchestrates feature development across web, iOS, Android, and optionally desktop platforms using a coordinated, API-first workflow.

How does the workflow organize development across multiple platforms?

It runs a three-phase workflow: Phase 1 defines shared API contracts and design systems sequentially, Phase 2 dispatches specialized agents to build each platform in parallel, and Phase 3 validates cross-platform parity and optimizes performance.

What technologies does each platform implementation use?

Web uses React 18+/Next.js 14+ with TypeScript and TanStack Query; iOS uses SwiftUI with async/await and Core Data; Android uses Jetpack Compose with Kotlin coroutines; desktop uses Tauri 2.0 or Electron.

What are the success criteria for this workflow?

Feature parity within 5% variance across platforms, WCAG 2.2 AA accessibility compliance, and over 40% code reuse where applicable.

When should I not use this skill?

This skill is not suitable for single-platform features or tasks unrelated to multi-platform feature development.

Skill

Develop Cross-Platform Features Consistently

Name: Multi-Platform Feature Development Workflow
Availability: OnlineOnly
Author: Antigravity

Orchestrates multi-platform feature development: API-first design, parallel web/iOS/Android/desktop implementation.

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Updated last month

Source checked Aug 4, 2026

Version 15.8.0

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Why it matters

Build and deploy identical features across web, mobile, and desktop platforms. This asset ensures feature parity and platform-specific optimizations through an API-first architecture and parallel implementation strategies.

Outcomes

What it gets done

Define API contracts and shared data models.

Design cross-platform UI/UX consistency.

Implement feature logic for web, iOS, and Android in parallel.

Validate feature parity and optimize platform performance.

Install

Add it to your toolbox

Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/ag-multi-platform-apps-multi-platform | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

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Overview

Multi-Platform Feature Development Workflow

Orchestrates multi-platform feature development through API-first architecture and parallel web, iOS, Android, and desktop implementation with cross-platform validation. Use when building a feature that must ship consistently across web, mobile, and desktop with shared API contracts.

What it does

Orchestrates a multi-agent workflow for building and deploying the same feature consistently across web, mobile, and desktop platforms, using API-first architecture with parallel implementation and defined synchronization points.

When to use - and when NOT to

Use this skill when building a new feature that must ship consistently across web, iOS, Android, and optionally desktop, and when establishing shared API contracts and data models upfront would let platform teams work independently. Not a fit for single-platform features or for tasks unrelated to multi-platform feature development.

Inputs and outputs

Runs a three-phase workflow. Phase 1 (sequential architecture and API design) has a backend-architect agent define an OpenAPI 3.1 spec (REST endpoints, GraphQL schema where applicable, WebSocket events, auth, rate limiting, error formats) and shared data models; a ui-ux-designer agent builds a cross-platform design system (Material Design, iOS HIG, Fluent component specs, WCAG 2.2 AA accessibility, dark/light themes); and an architect-review agent designs shared business logic (platform-agnostic domain models, state management patterns like MVI/Redux/BLoC, caching/offline strategies, evaluating Kotlin Multiplatform or TypeScript sharing).

Phase 2 (parallel platform implementation) dispatches specialized agents per platform: a frontend-developer builds the web version (React 18+/Next.js 14+ App Router, TypeScript, TanStack Query, Zustand/Redux Toolkit, PWA, SSR/SSG, Core Web Vitals targets); an ios-developer builds SwiftUI/iOS 17+ with async/await, Core Data/SwiftData, and MVVM; a mobile-developer builds Jetpack Compose/Material 3 with Kotlin coroutines/Flow, Retrofit/Ktor, Room, Hilt, and MVI; and an optional desktop implementation uses Tauri 2.0 or Electron reusing web components with native OS integration and auto-updates.

Phase 3 (integration and validation) generates comprehensive API documentation (interactive OpenAPI/Swagger docs, SDK examples, Postman collections), validates cross-platform feature parity (functional matrix, UI consistency, accessibility, offline/network resilience testing), and applies platform-specific performance optimization (bundle size and SEO for web, app size/launch time/battery for iOS and Android, binary size/startup for desktop).

Configuration options include --platforms, --api-first (default true), --shared-code, --design-system, and --testing-strategy. Success criteria include feature parity within 5% variance across platforms, WCAG 2.2 AA accessibility, and over 40% code reuse where applicable.

Integrations

Coordinates specialized subagents for backend architecture, UI/UX design, and platform-specific development (React/Next.js, SwiftUI, Jetpack Compose, Tauri/Electron), plus documentation, testing, and performance-engineering agents.

Who it's for

Product engineering teams shipping a feature simultaneously across multiple platforms who need a coordinated, API-first workflow with parallel platform implementation rather than sequential, ad hoc per-platform builds.

Design the API contract for feature: $ARGUMENTS. Create OpenAPI 3.1 specification with RESTful endpoints, request/response schemas, and shared data models all platforms will consume.

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