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.
git clone --depth 1 https://github.com/sampaio-tech/flutter-core-modulesWrote 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/rules/sampaio-tech/flutter-core-modules/feature-storage)<a href="https://agentmods.dev/rules/sampaio-tech/flutter-core-modules/feature-storage"><img src="https://agentmods.dev/badge/rules/sampaio-tech/flutter-core-modules/feature-storage/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/rules/sampaio-tech/flutter-core-modules/feature-storage"><img src="https://agentmods.dev/badge/rules/sampaio-tech/flutter-core-modules/feature-storage.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 | $0.00000 | $0.01404 |
| Opus 5.5 | $0.00000 | $0.00562 |
| Sonnet 5.5 | $0.00000 | $0.00281 |
| Haiku 4.5 | $0.00000 | $0.00140 |
Grade A, and why
feature-storage 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 2mo 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 — 159 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature: Storage — Rules
What Is Already Implemented — Check Before Building
| Capability | Status |
|---|---|
| Firebase Storage download URL fetch | ✅ GetDownloadUrlUsecase |
| Firebase Storage JSON fetch | ✅ GetJsonUsecase |
| Transparent SharedPreferences caching | ✅ SharedPreferencesCacheLocalDataSource |
| Cache invalidation by date cutoff | ✅ invalidateCacheBefore: DateTime parameter |
| Cache invalidation by TTL duration | ✅ invalidateCacheDuration: Duration parameter |
| Display raster image from Storage | ✅ ImageNetworkFromStorageWidget |
| Display SVG from Storage | ✅ SvgFromStorageWidget |
| Debug/prod cache key separation | ✅ CacheKey.key appends _debug in debug mode |
| Firebase Storage file upload | ❌ Not in package — implement directly via firebase_storage |
| Firebase Storage file deletion | ❌ Not in package — implement directly |
| Alternative storage backends (S3, etc.) | ❌ Add a new StorageRemoteDataSource implementation |
Before fetching or displaying Firebase Storage content, check whether the above widgets and notifiers already cover the requirement.
Layer Structure
lib/src/features/storage/
├── domain/
│ ├── repositories/storage_repository.dart # abstract class with built-in cache logic
│ ├── data_sources/storage_remote_data_source.dart
│ └── usecases/ (GetDownloadUrlUsecase, GetJsonUsecase)
├── data/
│ ├── repositories/firebase_storage_repository.dart
│ └── data_sources/firebase_storage_remote_data_source.dart
└── presentation/
├── notifiers/
│ ├── get_download_url_state_notifier.dart # family provider
│ └── get_json_state_notifier.dart # family provider
└── widgets/
├── image_network_from_storage_widget.dart
└── svg_from_storage_widget.dart
Displaying Images and SVGs
Raster image (PNG/JPEG)
ImageNetworkFromStorageWidget(
path: 'images/user_avatar.png', // Firebase Storage path
width: 48,
height: 48,
fit: BoxFit.cover,
invalidateCacheDuration: const Duration(days: 7),
progressIndicatorWidget: const CupertinoActivityIndicator(),
errorWidget: const Icon(CupertinoIcons.person_circle),
)
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.
- 2mo ago First seen · 159 lines · 0 tokens per session scan A 0f99350bb044
feature-storage is a cursor rule published in the GitHub repository sampaio-tech/flutter-core-modules (2 stars, last pushed 16d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,404 tokens. 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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