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 ariaramin/flutter-skills --skill dart-flutter-equatable-engineeringgit clone --depth 1 https://github.com/ariaramin/flutter-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/ariaramin/flutter-skills/dart-flutter-equatable-engineering)<a href="https://agentmods.dev/skills/ariaramin/flutter-skills/dart-flutter-equatable-engineering"><img src="https://agentmods.dev/badge/skills/ariaramin/flutter-skills/dart-flutter-equatable-engineering/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/ariaramin/flutter-skills/dart-flutter-equatable-engineering"><img src="https://agentmods.dev/badge/skills/ariaramin/flutter-skills/dart-flutter-equatable-engineering.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 | $0.00116 | $0.03928 |
| Opus 5.5 | $0.00046 | $0.01571 |
| Sonnet 5.5 | $0.00023 | $0.00786 |
| Haiku 4.5 | $0.00012 | $0.00393 |
Grade A, and why
dart-flutter-equatable-engineering 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 5d 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 — 400 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dart & Flutter Equatable Engineering
Goal
Treat Equatable as an implementation mechanism for an already-defined equality model.
Do not begin with extends Equatable. First determine:
- what the type represents;
- whether separately constructed instances should be interchangeable;
- which fields define that logical value;
- whether equality must remain stable for the object's lifetime;
- whether Bloc, selectors, caches, sets, maps, or tests rely on that equality;
- which single equality mechanism best represents the semantics. Optimize for correctness first. Equality mistakes can silently alter state emission, rebuild behavior, cache keys, map/set lookup, deduplication, and tests.
Research baseline and freshness guard
The bundled source is based on Equatable 2.1.0 behavior, Dart equality documentation, and current Bloc/flutter_bloc behavior from that research baseline.
Before changing repository code:
- inspect
pubspec.yamlandpubspec.lock; - identify the Equatable version;
- identify Dart/Flutter constraints;
- identify Bloc/flutter_bloc versions when state equality is involved;
- verify version-sensitive APIs before migrating legacy code. Important baseline facts from the supplied research:
- Equatable 2.1.0 requires Dart
>=3.0.0 <4.0.0; Equatableis anabstract mixin classin that version;- legacy
EquatableMixinis deprecated in favor ofwith Equatable; - Equatable equality includes
runtimeTypeandprops; - current Equatable structurally compares supported lists/iterables, sets, maps, and nested values;
- current Bloc/Cubit suppresses later emissions when the next state equals the current state, with the documented first-emission exception. Do not silently project these details onto a repository using materially different versions.
Reference routing
Load only the reference relevant to the task.
| Task | Read |
|---|---|
Choosing equality semantics; Equatable API; props; nested objects; collections; inheritance; entities; records; generators; manual equality |
references/01-equality-modeling.md |
Bloc/Cubit states/events; copyWith; selectors; hash collections; stringify; sensitive output |
references/02-bloc-state-and-stringify.md |
| Equality performance; large collections; profiling; tests; debugging wrong equality | references/03-performance-testing-debugging.md |
| Anti-pattern review; new-model workflow; existing-code review; migrations; production checklists | references/04-antipatterns-workflows-checklists.md |
| Read the full relevant reference before making a high-risk semantic change. |
What ships with it
4 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.
- 5d ago First seen · 400 lines · 116 tokens per session scan A 724d9450477a
dart-flutter-equatable-engineering is a skill published in the GitHub repository ariaramin/flutter-skills (6 stars, last pushed 5d ago), licensed MIT. It adds 116 tokens to every session and 3,928 once invoked, about $0.0005 per session on Opus 5.5. 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 2026-10-11.
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