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 FortiumPartners/ensemble --skill developing-with-fluttergit clone --depth 1 https://github.com/FortiumPartners/ensembleWrote 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/fortiumpartners/ensemble/developing-with-flutter)<a href="https://agentmods.dev/skills/fortiumpartners/ensemble/developing-with-flutter"><img src="https://agentmods.dev/badge/skills/fortiumpartners/ensemble/developing-with-flutter/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/fortiumpartners/ensemble/developing-with-flutter"><img src="https://agentmods.dev/badge/skills/fortiumpartners/ensemble/developing-with-flutter.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 | $0.00037 | $0.02990 |
| Opus 5.5 | $0.00015 | $0.01196 |
| Sonnet 5.5 | $0.00007 | $0.00598 |
| Haiku 4.5 | $0.00004 | $0.00299 |
Grade B, and why
developing-with-flutter scanned grade B with 1 finding 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 1mo 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
| `CocoaPods not installed` | `sudo gem install cocoapods` | How it starts
The opening of the file, as written. The whole thing — 473 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Flutter SDK Skill
Quick Reference
Flutter is Google's UI toolkit for building natively compiled applications for mobile (iOS, Android), web, and desktop from a single Dart codebase.
Table of Contents
- Critical: Avoiding Interactive Mode
- Prerequisites
- CLI Decision Tree
- Project Structure
- State Management
- Widget Patterns
- Navigation (GoRouter)
- Platform-Specific Code
- Web-Specific Considerations
- Testing
- Error Handling
- CI/CD Integration
- Auto-Detection Triggers
- Agent Integration
- Sources
Critical: Avoiding Interactive Mode
Flutter CLI can enter interactive mode which will hang Claude Code. Always use flags to bypass prompts:
| Command | WRONG (Interactive) | CORRECT (Non-Interactive) |
|---|---|---|
| Create project | flutter create (prompts) |
flutter create my_app --org com.example |
| Run app | flutter run (prompts for device) |
flutter run -d <device_id> |
| Build | flutter build (may prompt) |
flutter build apk --release |
| Emulators | flutter emulators --launch |
flutter emulators --launch <emulator_id> |
Always include:
-d <device_id>for device selection (useflutter devicesto list)- Explicit build targets (
apk,appbundle,ios,web) --no-pubwhen pub get is not needed--suppress-analyticsin CI/CD environments
Never use in Claude Code:
- Commands that open GUI (Android Studio, Xcode)
- Interactive device selection prompts
- Commands without explicit targets
Prerequisites
flutter --version # Expected: Flutter 3.x.x
flutter doctor # Check all requirements
flutter devices # List available devices
flutter emulators # List available emulators
What ships with it
3 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.
- 1mo ago First seen · 473 lines · 37 tokens per session scan B 2a2d303100c8
developing-with-flutter is a skill published in the GitHub repository FortiumPartners/ensemble (12 stars, last pushed 2d ago), licensed MIT. It adds 37 tokens to every session and 2,990 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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