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    Flutter Product Builder Skill

    1

    Architect, build, and optimize maintainable Flutter apps with responsive UI and robust state management.

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    Flutter Product Builder Skill

    Flutter Product Builder Skill

    Example session with this skill installed

    Plan a responsive Flutter shopping cart feature using Riverpod. Include API integration for a REST backend, error handling, and unit tests for the cart logic.

    • Read your context and instructions
    • Compiled the flutter product builder

    I have designed the shopping cart feature using a feature-first architecture. This plan covers the data layer for REST integration, Riverpod providers for state, and a responsive UI strategy.

    Shopping Cart Feature Plan

    Architecture & Data Flow

    LayerResponsibilityImplementation Detail
    DataAPI Client & ModelsCartRepository using dio or http; CartItem freezed models.
    DomainBusiness LogicCart total calculations and validation rules.
    PresentationUI & StateAsyncNotifierProvider (Riverpod) to manage loading/error/data states.

    Implementation Code

    // lib/features/cart/domain/cart_provider.dart
import 'package:riverpod_annotation/riverpod_annotation.dart';
import '../data/cart_repository.dart';
import '../models/cart_item.dart';

part 'cart_provider.g.dart';

@riverpod
class CartNotifier extends _$CartNotifier {
  @override
  FutureOr<List<CartItem>> build() => ref.watch(cartRepositoryProvider).fetchCart();

  Future<void> addItem(String productId) async {
    state = const AsyncLoading();
    state = await AsyncValue.guard(() async {
      await ref.read(cartRepositoryProvider).addToCart(productId);
      return ref.read(cartRepositoryProvider).fetchCart();
    });
  }
}

    Testing Strategy

    // test/features/cart/cart_provider_test.dart
void main() {
  test('CartNotifier initial state is loading then data', () async {
    final container = createContainer(overrides: [...]);
    expect(container.read(cartProvider), const AsyncLoading());
    await container.read(cartProvider.future);
    expect(container.read(cartProvider).value, isA<List<CartItem>>());
  });
}

    Next steps

    1. Define the CartItem model using json_serializable to match your REST API schema.
    2. Implement the CartRepository with error handling for 404 and 500 status codes.
    3. Build the CartScreen using LayoutBuilder to toggle between a list and a grid view for tablet support.

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    About this skill

    Ship production-ready Flutter applications without the architectural debt. This skill handles the heavy lifting of planning and building cross-platform apps, from initial scaffolding to release-ready code. It addresses the common pitfalls of Flutter development, including messy state management, bloated widget trees, and brittle API integrations.

    What it does

    • Architect Applications by designing feature-oriented structures using clean architecture principles.
    • Manage State through context-aware recommendations for Riverpod, Bloc, Provider, or local state.
    • Build Responsive UI that adapts to phones, tablets, and desktops using flexible constraints.
    • Integrate Backends via typed REST API models, Firebase, and secure persistence layers.
    • Audit Performance by identifying unnecessary rebuilds, expensive UI thread work, and memory leaks.
    • Plan Testing across unit, widget, and integration levels to ensure regression-free deployments.

    How it works

    1. Provide your product idea, feature requirements, and preferred tech stack (e.g., Riverpod, Firebase).
    2. Review the generated architecture plan and state-management strategy tailored to your app's complexity.
    3. Use the ordered implementation steps to build out screens, reusable widgets, and data layers.
    4. Run the provided performance and security checklists before preparing for store submission.

    Frameworks & tools

    Flutter SDK, Dart, Riverpod, Bloc/Cubit, Provider, Firebase, and RESTful APIs.

    Why this beats prompting it yourself

    Generic prompts often result in "spaghetti code" inside a single main.dart file. This skill enforces strict separation of concerns between presentation, domain, and data layers, ensuring your app remains maintainable as it scales.

    Use cases

    • Scaffolding a new feature with complex async workflows and error handling.
    • Refactoring a legacy Flutter codebase to use a more scalable state management pattern.
    • Designing a responsive dashboard that works on both mobile and web browsers.
    • Auditing an existing app for performance bottlenecks and security vulnerabilities.

    Known limitations

    Requires specific platform and version details for accurate build configurations. Cannot execute code or run actual performance profiling without environment access.

    Requires platform and version details for accurate build configurations. Cannot execute code or perform live profiling. Architecture trade-offs are advisory.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

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    3. 3

      Ask for what you need

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    What's inside

    Frequently Asked Questions

    This skill goes beyond simple code snippets by enforcing Clean Architecture principles, ensuring your app is structured with clear separation between UI, business logic, and data layers to prevent technical debt.

    While it defaults to industry leaders like Riverpod and Bloc, the skill is context-aware and can adapt its architectural recommendations based on your specific project requirements or existing codebase.

    You will receive a comprehensive development framework including architectural blueprints, responsive UI patterns, typed data models, and specialized checklists for performance and security auditing.

    The skill is optimized for the latest stable version of the Flutter SDK and Dart, but it can also assist in refactoring or upgrading legacy codebases to current best practices.

    It supports a wide range of integrations, including Firebase (Auth, Firestore, Storage), RESTful API consumption with typed models, and secure local persistence for offline-first capabilities.

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