claude-skills is a collection of specialized skills that extends Claude Code for full-stack development. Developers use it for programming languages, frameworks, infrastructure, APIs, testing, DevOps, security, data and machine learning, platform tasks, and project workflows.
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 Jeffallan/claude-skills --skill flutter-expertgit clone --depth 1 https://github.com/Jeffallan/claude-skillsWrote 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/jeffallan/claude-skills/flutter-expert)<a href="https://agentmods.dev/skills/jeffallan/claude-skills/flutter-expert"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/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/jeffallan/claude-skills/flutter-expert"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/flutter-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00041 | $0.01253 |
| Opus 5 | $0.00020 | $0.00626 |
| Sonnet 5 | $0.00008 | $0.00251 |
| Haiku 4.5 | $0.00004 | $0.00125 |
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 10d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- flutter-expert — 92% identical, 2 lines differ
How it starts
The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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 |
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 141 lines · 41 tokens per session scan A 0fe131375465
flutter-expert is a skill published in the GitHub repository Jeffallan/claude-skills (11,380 stars, last pushed 1mo ago), licensed MIT. It adds 41 tokens to every session and 1,253 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 2026-08-30.
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