Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add hoangatg/ai-agent-toolkit --skill flutter-expertgit clone --depth 1 https://github.com/hoangatg/ai-agent-toolkitWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/hoangatg/ai-agent-toolkit/flutter-expert)<a href="https://agentmods.dev/skills/hoangatg/ai-agent-toolkit/flutter-expert"><img src="https://agentmods.dev/badge/skills/hoangatg/ai-agent-toolkit/flutter-expert/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/hoangatg/ai-agent-toolkit/flutter-expert"><img src="https://agentmods.dev/badge/skills/hoangatg/ai-agent-toolkit/flutter-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00032 | $0.00862 |
| Opus 5 | $0.00016 | $0.00431 |
| Sonnet 5 | $0.00006 | $0.00172 |
| Haiku 4.5 | $0.00003 | $0.00086 |
Grade A, and why
flutter-expert scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Flutter Expert
Beautiful apps, natively compiled, from a single codebase.
1. Architecture Patterns
App Architecture
| Pattern | Best For |
|---|---|
| Clean Architecture | Large apps, testability |
| BLoC | Event-driven, reactive |
| MVVM | Simple separation of concerns |
| Riverpod | Modern, compile-safe DI |
Project Structure
lib/
├── main.dart
├── app/ # App config, themes, routes
├── core/ # Shared utilities, constants
├── features/ # Feature-first organization
│ ├── auth/
│ │ ├── data/ # Repositories, data sources
│ │ ├── domain/ # Entities, use cases
│ │ └── presentation/ # Screens, widgets, state
│ └── home/
└── shared/ # Shared widgets, services
2. State Management
| Solution | Complexity | Best For |
|---|---|---|
| setState | Low | Simple local state |
| Provider | Low-Med | Basic DI + state |
| Riverpod | Medium | Type-safe, testable, modern |
| BLoC/Cubit | Medium | Event-driven, enterprise |
| GetX | Low | Rapid prototyping (not for prod) |
3. Widget Design
Principles
| Principle | Application |
|---|---|
| Composition | Small widgets composed together |
| Const constructors | Mark widgets const when possible |
| Keys | Use keys for list items, AnimatedSwitcher |
| Builder pattern | Lazy building for performance |
| Separation | UI widgets vs logic widgets |
Custom Widget Checklist
- Does it have a const constructor?
- Is it stateless (if possible)?
- Does it expose enough customization?
- Is it reusable across features?
4. Navigation
| Solution | Features |
|---|---|
| GoRouter | Declarative, deep linking, type-safe |
| Navigator 2.0 | Full control, complex flows |
| Auto Route | Code generation, type-safe |
5. Performance
| Technique | Impact |
|---|---|
| const widgets | Skip rebuild entirely |
| RepaintBoundary | Isolate repaint regions |
| ListView.builder | Lazy rendering for lists |
| Image caching | cached_network_image |
| Compute isolates | Heavy computation off main thread |
| DevTools profiler | Find jank and memory leaks |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 133 lines · 32 tokens per session scan A 0fe3912276e9
flutter-expert is a skill published in the GitHub repository hoangatg/ai-agent-toolkit (1 stars, last pushed 5mo ago), licensed MIT. It adds 32 tokens to every session and 862 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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