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 agentmods add skills/tienenwu/fables/flutternpx skills add tienenwu/fables --skill fluttergit clone --depth 1 https://github.com/tienenwu/fablesWhat 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 | $0.00096 | $0.01330 |
| Opus 5 | $0.00048 | $0.00665 |
| Sonnet 5 | $0.00019 | $0.00266 |
| Haiku 4.5 | $0.00010 | $0.00133 |
Grade A, and why
flutter-dev-playbook 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 — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
🌐 繁體中文（canonical） · English mirror
Flutter Development Judgment Handbook
Core Principles
- A green light in Debug (JIT) does not count: release/profile are AOT-compiled and behave differently from debug —
assertis stripped, tree shaking removes symbols only referenced via reflection/strings, and faster timing shakes out races. Every release-related change and all performance measurement must be verified in profile/release; see references/platform-build.md. build()is a pure function and may be called every frame: never do IO, network,setState, controller construction, or file writes inside build — side effects rerun every frame.- Classify state first: ephemeral vs app state: only this widget uses it and losing it is fine →
setState; shared across widgets or must survive → provider/Bloc. Wrong layer = rebuild storm or lost state. - Actively narrow rebuild scope: read state as low as possible; use
select/Consumerto sink down to the leaf that actually uses the value, so the whole subtree doesn't rebuild along with it. - Two platforms are two engineering efforts: permission declarations, signing, build mode, and plugin native implementations exist once each for Android and iOS; a release only counts as verified when each has been run once.
Kickoff Routing
| Situation | Path | Read first |
|---|---|---|
| New screen/feature | Decide the state owner and layering first, then write widgets | references/state-architecture.md |
| Choose setState / Riverpod / Bloc | Walk the selection decision tree, not personal taste | references/state-architecture.md §1 |
| UI jank / dropped frames / too many rebuilds | Profile first, don't change code first | references/widgets-performance.md §jank |
| Extract widget, const, ListView | Criteria are here; don't extract helper methods blindly | references/widgets-performance.md |
| Touching native (camera/Bluetooth/system API) | First ask whether an existing plugin works | references/platform-build.md §channel |
| Fine in debug, crashes only in release | Assume tree shaking / AOT / environment difference first | references/platform-build.md §build-mode-differences |
| Shipping release / store submission | Run the checklist item by item, once per platform | references/release-checklist.md |
| Adding a dependency | Check pub.dev score and maintenance status first | references/release-checklist.md §packages |
What ships with it
5 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.
- 2d ago First seen · 59 lines · 96 tokens per session scan A 3e6ae00011c9
flutter-dev-playbook is a skill published in the GitHub repository tienenwu/fables (4 stars, last pushed 1mo ago), licensed MIT. It adds 96 tokens to every session and 1,330 once invoked, about $0.0005 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 2026-08-31.
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