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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/jeffallan/claude-skills --skill flutter-expert- 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-expert automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
Flutter Expert
Senior mobile engineer building high-performance cross-platform applications with Flutter 3 and Dart.
When to Use This Skill
- Building cross-platform Flutter applications
- Implementing state management (Riverpod, Bloc)
- Setting up navigation with GoRouter
- Creating custom widgets and animations
- Optimizing Flutter performance
- Platform-specific implementations
Core Workflow
- Setup — Scaffold project, add dependencies (
flutter pub get), configure routing - State — Define Riverpod providers or Bloc/Cubit classes; verify with
flutter analyze- If
flutter analyzereports issues: fix all lints and warnings before proceeding; re-run until clean
- If
- Widgets — Build reusable, const-optimized components; run
flutter testafter each feature- If tests fail: inspect widget tree with Flutter DevTools, fix failing assertions, re-run
flutter test
- If tests fail: inspect widget tree with Flutter DevTools, fix failing assertions, re-run
- Test — Write widget and integration tests; confirm with
flutter test --coverage- If coverage drops or tests fail: identify untested branches, add targeted tests, re-run before merging
- Optimize — Profile with Flutter DevTools (
flutter run --profile), eliminate jank, reduce rebuilds- If jank persists: check rebuild counts in the Performance overlay, isolate expensive
build()calls, applyconstor move state closer to consumers
- If jank persists: check rebuild counts in the Performance overlay, isolate expensive
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Riverpod | references/riverpod-state.md | State management, providers, notifiers |
| Bloc | references/bloc-state.md | Bloc, Cubit, event-driven state, complex business logic |
| GoRouter | references/gorouter-navigation.md | Navigation, routing, deep linking |
| Widgets | references/widget-patterns.md | Building UI components, const optimization |
| Structure | references/project-structure.md | Setting up project, architecture |
| Performance | references/performance.md | Optimization, profiling, jank fixes |
Code Examples
Riverpod Provider + ConsumerWidget (correct pattern)
// provider definition — Notifier, not the legacy StateNotifier
final counterProvider = NotifierProvider<CounterNotifier, int>(CounterNotifier.new);
class CounterNotifier extends Notifier<int> {
@override
int build() => 0;
void increment() => state = state + 1; // new instance, never mutate
}
// consuming widget — use ConsumerWidget, not StatefulWidget
class CounterView extends ConsumerWidget {
const CounterView({super.key});
@override
Widget build(BuildContext context, WidgetRef ref) {
final count = ref.watch(counterProvider);
return Text('$count');
}
}
Before / After — State Management
// ❌ WRONG: app-wide state in setState
class _BadCounterState extends State<BadCounter> {
int _count = 0;
void _inc() => setState(() => _count++); // causes full subtree rebuild
}
// ✅ CORRECT: scoped Riverpod consumer
class GoodCounter extends ConsumerWidget {
const GoodCounter({super.key});
@override
Widget build(BuildContext context, WidgetRef ref) {
final count = ref.watch(counterProvider);
return IconButton(
onPressed: () => ref.read(counterProvider.notifier).increment(),
icon: const Icon(Icons.add), // const on static widgets
);
}
}
Constraints
MUST DO
- Use
constconstructors wherever possible - Implement proper keys for lists
- Use
Consumer/ConsumerWidgetfor state (notStatefulWidget) - Follow Material/Cupertino design guidelines
- Profile with DevTools, fix jank
- Test widgets with
flutter_test
MUST NOT DO
- Build widgets inside
build()method - Mutate state directly (always create new instances)
- Use
setStatefor app-wide state - Skip
conston static widgets - Ignore platform-specific behavior
- Block UI thread with heavy computation (use
compute())
Troubleshooting Common Failures
| Symptom | Likely Cause | Recovery |
|---|---|---|
flutter analyze errors | Unresolved imports, missing const, type mismatches | Fix flagged lines; run flutter pub get if imports are missing |
| Widget test assertion failures | Widget tree mismatch or async state not settled | Use tester.pumpAndSettle() after state changes; verify finder selectors |
| Build fails after adding package | Incompatible dependency version | Run flutter pub upgrade --major-versions; check pub.dev compatibility |
| Jank / dropped frames | Expensive build() calls, uncached widgets, heavy main-thread work | Use RepaintBoundary, move heavy work to compute(), add const |
| Hot reload not reflecting changes | State held in Notifier not reset | Use hot restart (R in terminal) to reset full app state |
Output Templates
When implementing Flutter features, provide:
- Widget code with proper
constusage - Provider/Bloc definitions
- Route configuration if needed
- Test file structure
Maintained by @jeffallan, Principal Consultant at Synergetic Solutions
FAQ
What does the flutter-expert skill do?
Use when building cross-platform applications with Flutter 3+ and Dart. Invoke for widget development, Riverpod/Bloc state management, GoRouter navigation, platform-specific implementations, performance optimization.
How do I install flutter-expert?
Run npx skills add https://github.com/jeffallan/claude-skills --skill flutter-expert 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-expert/ (personal) or .claude/skills/flutter-expert/ (project).
Which AI agents can use flutter-expert?
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-expert safe to install?
Security partners have reviewed it: Gen Agent Trust Hub flagged risks; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains flutter-expert?
It is published by jeffallan in jeffallan/claude-skills. It has 14,452 recorded installs.
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