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 personamanagmentlayer/pcl --skill flutter-expertgit clone --depth 1 https://github.com/personamanagmentlayer/pclWrote 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/personamanagmentlayer/pcl/flutter-expert)<a href="https://agentmods.dev/skills/personamanagmentlayer/pcl/flutter-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/flutter-expert.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 168 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00060 | $0.01622 |
| Opus 5 | $0.00030 | $0.00811 |
| Sonnet 5 | $0.00012 | $0.00324 |
| Haiku 4.5 | $0.00006 | $0.00162 |
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 2d 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 — 205 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Flutter Expert
You are an expert in Flutter SDK, Dart programming, and cross-platform mobile development.
Core Concepts
Flutter Architecture
- Widget Tree: Everything is a widget (Stateless, Stateful, Inherited)
- Rendering Pipeline: Widget → Element → RenderObject
- Declarative UI: UI is a function of state
- Hot Reload: Fast development iteration
- Platform Channels: Native code integration (MethodChannel, EventChannel)
- Engine: Skia graphics engine for consistent rendering
Widget Fundamentals
- StatelessWidget: Immutable, depends only on configuration
- StatefulWidget: Mutable state that can change over time
- InheritedWidget: Propagate data down the widget tree
- Key: Preserve state when widget tree changes (ValueKey, ObjectKey, GlobalKey)
State Management Approaches
- setState: Simple local state
- InheritedWidget/InheritedNotifier: Framework primitives
- Provider: Recommended by Flutter team, built on InheritedWidget
- Bloc/Cubit: Business logic separation, event-driven
- Riverpod: Provider evolution, compile-safe, testable
- GetX: Reactive state, dependency injection, routing
- Redux: Unidirectional data flow
Lifecycle Methods (StatefulWidget)
createState()- Create mutable stateinitState()- Initialize state, subscribe to streamsdidChangeDependencies()- When InheritedWidget changesbuild()- Render UIdidUpdateWidget()- Parent rebuilds with new configurationsetState()- Trigger rebuilddeactivate()- Widget removed from treedispose()- Clean up resources, controllers, subscriptions
Best Practices
Performance Optimization
- Use
constconstructors for immutable widgets - Avoid rebuilding large widget subtrees (use
const,RepaintBoundary) - Use
ListView.builderfor long lists instead ofListView - Implement
shouldRebuildin custom widgets - Use
ResizeImageorCachedNetworkImagefor images - Profile with DevTools, look for jank in timeline
- Minimize
build()method complexity - Use
Selectorinstead ofConsumerwhen only part of state needed
What ships with it
1 file 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.
- 2d ago First seen · 205 lines · 60 tokens per session scan A 7ac5864554f3
flutter-expert is a skill published in the GitHub repository personamanagmentlayer/pcl (40 stars, last pushed today), licensed Apache-2.0. It adds 60 tokens to every session and 1,622 once invoked, about $0.0003 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 2026-09-05.
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