flutter

Q: How do I install flutter?

Run npx skills add https://github.com/alinaqi/maggy --skill flutter in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/flutter/ (personal) or .claude/skills/flutter/ (project).

by alinaqiMobile

Flutter development with Riverpod state management, Freezed, gorouter, and mocktail testing

Installs: 737
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/alinaqi/maggy --skill flutter

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads flutter automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Flutter Skill

Project Structure

project/
├── lib/
│   ├── core/                           # Core utilities
│   │   ├── constants/                  # App constants
│   │   ├── extensions/                 # Dart extensions
│   │   ├── router/                     # go_router configuration
│   │   │   └── app_router.dart
│   │   └── theme/                      # App theme
│   │       └── app_theme.dart
│   ├── data/                           # Data layer
│   │   ├── models/                     # Freezed data models
│   │   ├── repositories/               # Repository implementations
│   │   └── services/                   # API services
│   ├── domain/                         # Domain layer
│   │   ├── entities/                   # Business entities
│   │   └── repositories/               # Repository interfaces
│   ├── presentation/                   # UI layer
│   │   ├── common/                     # Shared widgets
│   │   ├── features/                   # Feature modules
│   │   │   └── feature_name/
│   │   │       ├── providers/          # Riverpod providers
│   │   │       ├── widgets/            # Feature-specific widgets
│   │   │       └── feature_screen.dart
│   │   └── providers/                  # Global providers
│   ├── main.dart
│   └── app.dart
├── test/
│   ├── unit/                           # Unit tests
│   ├── widget/                         # Widget tests
│   └── integration/                    # Integration tests
├── pubspec.yaml
├── analysis_options.yaml
└── CLAUDE.md

Riverpod State Management

Provider Types

// Simple value provider
final appNameProvider = Provider<String>((ref) => 'My App');

// StateProvider for simple mutable state
final counterProvider = StateProvider<int>((ref) => 0);

// NotifierProvider for complex state logic
final userProvider = NotifierProvider<UserNotifier, User?>(() => UserNotifier());

// AsyncNotifierProvider for async operations
final usersProvider = AsyncNotifierProvider<UsersNotifier, List<User>>(
  () => UsersNotifier(),
);

// FutureProvider for simple async data
final configProvider = FutureProvider<Config>((ref) async {
  return await ref.watch(configServiceProvider).loadConfig();
});

// StreamProvider for real-time data
final messagesProvider = StreamProvider<List<Message>>((ref) {
  return ref.watch(messageServiceProvider).watchMessages();
});

// Family providers for parameterized data
final userByIdProvider = FutureProvider.family<User, String>((ref, userId) async {
  return await ref.watch(userRepositoryProvider).getUser(userId);
});

Notifier Pattern

@riverpod
class Users extends _$Users {
  @override
  Future<List<User>> build() async {
    return await _fetchUsers();
  }

  Future<List<User>> _fetchUsers() async {
    final repository = ref.read(userRepositoryProvider);
    return await repository.getUsers();
  }

  Future<void> refresh() async {
    state = const AsyncLoading();
    state = await AsyncValue.guard(() => _fetchUsers());
  }

  Future<void> addUser(User user) async {
    final repository = ref.read(userRepositoryProvider);
    await repository.addUser(user);
    ref.invalidateSelf();
  }
}

AsyncValue Handling

class UsersScreen extends ConsumerWidget {
  const UsersScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final usersAsync = ref.watch(usersProvider);

    return usersAsync.when(
      data: (users) => UsersList(users: users),
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (error, stack) => ErrorDisplay(
        error: error,
        onRetry: () => ref.invalidate(usersProvider),
      ),
    );
  }
}

// Pattern matching alternative
Widget build(BuildContext context, WidgetRef ref) {
  final usersAsync = ref.watch(usersProvider);

  return switch (usersAsync) {
    AsyncData(:final value) => UsersList(users: value),
    AsyncLoading() => const LoadingIndicator(),
    AsyncError(:final error) => ErrorDisplay(error: error),
  };
}

ref Methods

// watch - rebuilds when provider changes
final users = ref.watch(usersProvider);

// read - one-time read, no rebuild
void onButtonPressed() {
  ref.read(counterProvider.notifier).state++;
}

// listen - react to changes without rebuild
ref.listen(authProvider, (previous, next) {
  if (next == null) {
    context.go('/login');
  }
});

// invalidate - force refresh
ref.invalidate(usersProvider);

// keepAlive - prevent auto-dispose
final link = ref.keepAlive();
// Later: link.close() to allow disposal

Freezed Data Models

Model Definition

import 'package:freezed_annotation/freezed_annotation.dart';

part 'user.freezed.dart';
part 'user.g.dart';

@freezed
class User with _$User {
  const factory User({
    required String id,
    required String name,
    required String email,
    @Default(false) bool isActive,
    DateTime? createdAt,
  }) = _User;

  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
}

// Union types for states
@freezed
sealed class AuthState with _$AuthState {
  const factory AuthState.initial() = _Initial;
  const factory AuthState.loading() = _Loading;
  const factory AuthState.authenticated(User user) = _Authenticated;
  const factory AuthState.unauthenticated() = _Unauthenticated;
  const factory AuthState.error(String message) = _Error;
}

Using Freezed Unions

Widget build(BuildContext context, WidgetRef ref) {
  final authState = ref.watch(authProvider);

  return authState.when(
    initial: () => const SplashScreen(),
    loading: () => const LoadingScreen(),
    authenticated: (user) => HomeScreen(user: user),
    unauthenticated: () => const LoginScreen(),
    error: (message) => ErrorScreen(message: message),
  );
}

go_router Navigation

Router Configuration

final routerProvider = Provider<GoRouter>((ref) {
  final authState = ref.watch(authProvider);

  return GoRouter(
    initialLocation: '/',
    refreshListenable: authState,
    redirect: (context, state) {
      final isLoggedIn = authState.valueOrNull != null;
      final isLoggingIn = state.matchedLocation == '/login';

      if (!isLoggedIn && !isLoggingIn) return '/login';
      if (isLoggedIn && isLoggingIn) return '/';
      return null;
    },
    routes: [
      GoRoute(
        path: '/',
        builder: (context, state) => const HomeScreen(),
        routes: [
          GoRoute(
            path: 'user/:id',
            builder: (context, state) => UserScreen(
              userId: state.pathParameters['id']!,
            ),
          ),
        ],
      ),
      GoRoute(
        path: '/login',
        builder: (context, state) => const LoginScreen(),
      ),
    ],
    errorBuilder: (context, state) => ErrorScreen(error: state.error),
  );
});

Navigation

// Navigate to route
context.go('/user/123');

// Push onto stack
context.push('/user/123');

// Pop current route
context.pop();

// Replace current route
context.pushReplacement('/home');

// Named routes
context.goNamed('user', pathParameters: {'id': '123'});

Widget Patterns

ConsumerWidget vs ConsumerStatefulWidget

// Stateless with Riverpod
class UserCard extends ConsumerWidget {
  const UserCard({super.key, required this.userId});

  final String userId;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final user = ref.watch(userByIdProvider(userId));
    return user.when(
      data: (user) => Card(child: Text(user.name)),
      loading: () => const CardSkeleton(),
      error: (e, _) => ErrorCard(error: e),
    );
  }
}

// Stateful with Riverpod
class SearchScreen extends ConsumerStatefulWidget {
  const SearchScreen({super.key});

  @override
  ConsumerState<SearchScreen> createState() => _SearchScreenState();
}

class _SearchScreenState extends ConsumerState<SearchScreen> {
  final _controller = TextEditingController();

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final results = ref.watch(searchProvider(_controller.text));
    return Column(
      children: [
        TextField(
          controller: _controller,
          onChanged: (_) => setState(() {}),
        ),
        Expanded(child: SearchResults(results: results)),
      ],
    );
  }
}

HookConsumerWidget (with flutter_hooks)

class AnimatedCounter extends HookConsumerWidget {
  const AnimatedCounter({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final controller = useAnimationController(duration: const Duration(milliseconds: 300));
    final count = ref.watch(counterProvider);

    useEffect(() {
      controller.forward(from: 0);
      return null;
    }, [count]);

    return ScaleTransition(
      scale: controller,
      child: Text('$count'),
    );
  }
}

Testing with Mocktail

Unit Tests

import 'package:flutter_test/flutter_test.dart';
import 'package:mocktail/mocktail.dart';
import 'package:riverpod/riverpod.dart';

class MockUserRepository extends Mock implements UserRepository {}

void main() {
  late MockUserRepository mockRepository;
  late ProviderContainer container;

  setUp(() {
    mockRepository = MockUserRepository();
    container = ProviderContainer(
      overrides: [
        userRepositoryProvider.overrideWithValue(mockRepository),
      ],
    );
  });

  tearDown(() {
    container.dispose();
  });

  test('usersProvider returns list of users', () async {
    final users = [User(id: '1', name: 'John', email: 'john@example.com')];
    when(() => mockRepository.getUsers()).thenAnswer((_) async => users);

    final result = await container.read(usersProvider.future);

    expect(result, equals(users));
    verify(() => mockRepository.getUsers()).called(1);
  });
}

Widget Tests

void main() {
  testWidgets('UserCard displays user name', (tester) async {
    final user = User(id: '1', name: 'John', email: 'john@example.com');

    await tester.pumpWidget(
      ProviderScope(
        overrides: [
          userByIdProvider('1').overrideWith((_) => AsyncData(user)),
        ],
        child: const MaterialApp(home: UserCard(userId: '1')),
      ),
    );

    expect(find.text('John'), findsOneWidget);
  });

  testWidgets('UserCard shows loading indicator', (tester) async {
    await tester.pumpWidget(
      ProviderScope(
        overrides: [
          userByIdProvider('1').overrideWith((_) => const AsyncLoading()),
        ],
        child: const MaterialApp(home: UserCard(userId: '1')),
      ),
    );

    expect(find.byType(CircularProgressIndicator), findsOneWidget);
  });
}

pubspec.yaml

name: my_app
description: A Flutter application
publish_to: 'none'
version: 1.0.0+1

environment:
  sdk: '>=3.2.0 <4.0.0'

dependencies:
  flutter:
    sdk: flutter

  # State management
  flutter_riverpod: ^2.4.9
  riverpod_annotation: ^2.3.3

  # Data models
  freezed_annotation: ^2.4.1
  json_annotation: ^4.8.1

  # Navigation
  go_router: ^13.0.0

  # Networking
  dio: ^5.4.0

  # Storage
  shared_preferences: ^2.2.2

  # Utils
  intl: ^0.19.0

dev_dependencies:
  flutter_test:
    sdk: flutter

  # Code generation
  build_runner: ^2.4.8
  freezed: ^2.4.6
  json_serializable: ^6.7.1
  riverpod_generator: ^2.3.9

  # Testing
  mocktail: ^1.0.2

  # Linting
  flutter_lints: ^3.0.1

GitHub Actions

name: Flutter CI

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - uses: subosito/flutter-action@v2
        with:
          flutter-version: '3.16.0'
          channel: 'stable'
          cache: true

      - name: Install dependencies
        run: flutter pub get

      - name: Generate code
        run: dart run build_runner build --delete-conflicting-outputs

      - name: Analyze
        run: flutter analyze --fatal-infos

      - name: Run tests
        run: flutter test --coverage

      - name: Build APK
        run: flutter build apk --release

analysis_options.yaml

include: package:flutter_lints/flutter.yaml

analyzer:
  exclude:
    - "**/*.g.dart"
    - "**/*.freezed.dart"
  errors:
    invalid_annotation_target: ignore
  language:
    strict-casts: true
    strict-inference: true
    strict-raw-types: true

linter:
  rules:
    - always_declare_return_types
    - avoid_dynamic_calls
    - avoid_print
    - avoid_type_to_string
    - cancel_subscriptions
    - close_sinks
    - prefer_const_constructors
    - prefer_const_declarations
    - prefer_final_locals
    - require_trailing_commas
    - unawaited_futures
    - use_super_parameters

Flutter Anti-Patterns

❌ Provider without autoDispose - Use .autoDispose to prevent memory leaks
❌ watch in callbacks - Use ref.read() in onPressed/callbacks, not ref.watch()
❌ Business logic in widgets - Move to Notifiers/providers
❌ Mutable state in providers - Use Freezed for immutable models
❌ Not using AsyncValue - Handle loading/error states with when()
❌ setState with Riverpod - Use providers for shared state
❌ Passing ref to functions - Keep ref usage within widgets/providers
❌ Deeply nested Consumer - Use ConsumerWidget instead
❌ Not using family for params - Use .family for parameterized providers
❌ Global GoRouter instance - Use Provider for router with redirect logic
❌ BuildContext across async - Store values before await, not context
❌ Ignoring dispose - Clean up controllers in ConsumerStatefulWidget

FAQ

What does the flutter skill do?

Flutter development with Riverpod state management, Freezed, gorouter, and mocktail testing

How do I install flutter?

Run npx skills add https://github.com/alinaqi/maggy --skill flutter in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/flutter/ (personal) or .claude/skills/flutter/ (project).

Which AI agents can use flutter?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is flutter safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains flutter?

It is published by alinaqi in alinaqi/maggy. It has 737 recorded installs.

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flutter

Install

Install

Describe the task

Review the result

SKILL.md

Flutter Skill

Project Structure

Riverpod State Management

Provider Types

Notifier Pattern

AsyncValue Handling

ref Methods

Freezed Data Models

Model Definition

Using Freezed Unions

go_router Navigation

Router Configuration

Navigation

Widget Patterns

ConsumerWidget vs ConsumerStatefulWidget

HookConsumerWidget (with flutter_hooks)

Testing with Mocktail

Unit Tests

Widget Tests

pubspec.yaml

GitHub Actions

analysis_options.yaml

Flutter Anti-Patterns

FAQ

More from alinaqi/maggy

Popular mobile skills