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/yendangn/flutter-app-builder/flutter-feature-flagsnpx skills add yendangn/flutter-app-builder --skill flutter-feature-flagsgit clone --depth 1 https://github.com/yendangn/flutter-app-builderWrote 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/yendangn/flutter-app-builder/flutter-feature-flags)<a href="https://agentmods.dev/skills/yendangn/flutter-app-builder/flutter-feature-flags"><img src="https://agentmods.dev/badge/skills/yendangn/flutter-app-builder/flutter-feature-flags.svg" alt="Measured on agentmods" 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 | $0.00061 | $0.00437 |
| Opus 5 | $0.00030 | $0.00218 |
| Sonnet 5 | $0.00012 | $0.00087 |
| Haiku 4.5 | $0.00006 | $0.00044 |
Grade A, and why
flutter-feature-flags 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 4d 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.
What it actually says
Flutter Feature Flags
Full reference: template.md
Key rules
FeatureFlagServiceis the app-owned interface. Never importfirebase_remote_configoutsideremote_config_feature_flag_service_impl.dart.- Default values: defined at build time in the impl — Remote Config just overrides them. App works correctly without network.
FeatureGatewidget:FeatureGate(flag: FeatureFlags.newCheckout, child: NewWidget(), fallback: OldWidget()). Noif (flag)scattered in build methods.LocalFeatureFlagService: in-memory impl for dev/test — allows toggling flags without Remote Config.- Dev menu: only visible when
AppConfig.env.isDev. Shows all flags with toggles. UsesLocalFeatureFlagServiceoverride. - Fetch + activate Remote Config on app start in
appBootstrap(). Set min fetch interval to 1 hour prod / 0 dev. - Kill switches: a
falseflag disables a broken feature without a release. Design every feature to have a kill switch from day 1.
Files
lib/src/core/feature_flags/
feature_flag_service.dart ← interface (isEnabled(flag))
feature_flags.dart ← constants (static const String newCheckout = 'new_checkout')
local_feature_flag_service.dart ← in-memory impl (dev/test)
remote_config_feature_flag_service_impl.dart ← only import of firebase_remote_config
feature_gate.dart ← widget (shows child or fallback based on flag)
Co-load with
flutter-di— registerFeatureFlagServicebased on envflutter-flavors—LocalFeatureFlagServicein devflutter-analytics— log which flag variant the user sees
What ships with it
7 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.
- 4d ago First seen · 36 lines · 61 tokens per session scan A 8b2004522434
flutter-feature-flags is a skill published in the GitHub repository yendangn/flutter-app-builder (5 stars, last pushed 2mo ago), licensed MIT. It adds 61 tokens to every session and 437 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 2026-08-31.
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