How to Scaffold Flutter & Dart Applications Using AI Prompt Architect

Flutter apps can target iOS, Android, web, and desktop from a single codebase. But this flexibility makes consistency even harder — AI assistants often generate StatefulWidgets when you use Riverpod, mix Material and Cupertino widgets, and ignore your folder structure. A Master Prompt prevents all of this.

The Flutter Consistency Problem

// ❌ Without Master Prompt
// Session 1: setState pattern
class MyWidget extends StatefulWidget { ... }

// Session 2: Provider pattern
class MyWidget extends ConsumerWidget { ... }

// Session 3: BLoC pattern
class MyBloc extends Bloc { ... }

Step 1: Define Your Flutter Architecture

framework: Flutter 3.x
language: Dart 3.x (null-safe, strict analysis)
state_management: Riverpod 2.x (preferred) or BLoC

project_structure:
  lib/
    app/          # App-level config, theme, routing
    features/     # Feature-first organisation
      auth/
        data/     # Repositories, data sources
        domain/   # Models, entities
        presentation/ # Screens, widgets, providers
      home/
        ...
    core/         # Shared utilities, constants, extensions
    l10n/         # Localisation

conventions:
  - Feature-first folder structure
  - Riverpod for all state (no setState except animations)
  - GoRouter for declarative navigation
  - Freezed for immutable models
  - Dio for HTTP with interceptors
  - Material 3 design system
  - flutter_test + mocktail for testing

Step 2: Generated Provider Pattern

// features/projects/presentation/providers/projects_provider.dart
import 'package:riverpod_annotation/riverpod_annotation.dart';
import '../../data/repositories/project_repository.dart';
import '../../domain/models/project.dart';

part 'projects_provider.g.dart';

@riverpod
class ProjectsNotifier extends _$ProjectsNotifier {
  @override
  FutureOr> build() async {
    final repo = ref.watch(projectRepositoryProvider);
    return repo.getProjects();
  }

  Future createProject(CreateProjectDto dto) async {
    state = const AsyncLoading();
    state = await AsyncValue.guard(() async {
      final repo = ref.read(projectRepositoryProvider);
      await repo.createProject(dto);
      return repo.getProjects();
    });
  }
}

Step 3: Theming Convention

// app/theme/app_theme.dart
class AppTheme {
  static ThemeData get light => ThemeData(
    useMaterial3: true,
    colorSchemeSeed: const Color(0xFF5C7CFA),
    brightness: Brightness.light,
    textTheme: GoogleFonts.interTextTheme(),
  );

  static ThemeData get dark => ThemeData(
    useMaterial3: true,
    colorSchemeSeed: const Color(0xFF5C7CFA),
    brightness: Brightness.dark,
    textTheme: GoogleFonts.interTextTheme(),
  );
}

Key Takeaways

1. Feature-first folders — group by feature, not by layer
2. One state management solution — pick Riverpod or BLoC and use it everywhere
3. Freezed for models — immutable, copyWith, JSON serialisation out of the box
4. GoRouter for navigation — declarative, type-safe routes with deep linking
5. Strict Dart analysis — catch issues at compile time, not runtime

You can use Flutter to build apps that leverage multi-modal prompting. Learn how in our guide: Multi-Modal Prompting: Working with Images, Code, and Text in GPT-4 and Claude.