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/flutter/agent-plugins/dart-setup-ffi-assetsnpx skills add flutter/agent-plugins --skill dart-setup-ffi-assetsgit clone --depth 1 https://github.com/flutter/agent-pluginsWhat 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 | $0.00145 | $0.04340 |
| Opus 5 | $0.00072 | $0.02170 |
| Sonnet 5 | $0.00029 | $0.00868 |
| Haiku 4.5 | $0.00015 | $0.00434 |
Grade B, and why
dart-setup-ffi-assets 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 yesterday.
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.
sudo apt install build-essential Copies of this mod
1 near-identical copy found in the catalogue:
- dart-setup-ffi-assets — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 420 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Compiling C Code into Code Assets with Native Assets Hooks
Integrate and automate the compilation and packaging of native C/C++ source code into Code Assets under Dart's overarching Native Assets feature using build and link hooks.
Contents
- Introduction
- Constraints
- Native Interop Packages
- Step-by-Step Workflow
- Choosing an Integration Approach
- Method 1: Local Compilation with Linker Tree-Shaking (Recommended)
- Method 2: Downloading Precompiled Dynamic Libraries
- Verification Checklist
Introduction
Under Dart's Native Assets feature, packages can package native code (like C/C++ libraries) as Code Assets and bundle them automatically during standard development cycles (e.g., dart run, dart test, dart build, and flutter run). The packaging of Code Assets is driven by two programmatic hook scripts placed inside a package's hook/ folder:
hook/build.dart: Compiles local C sources to machine code or bundles prebuilt native binaries as code assets for a specific host/target architecture.hook/link.dart: Links built code assets, applying advanced tree-shaking optimizations to strip unused native symbols and compress the runtime binary size.
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.
- yesterday First seen · 420 lines · 145 tokens per session scan B 361b38a74d11
dart-setup-ffi-assets is a skill published in the GitHub repository flutter/agent-plugins (2,895 stars, last pushed 3d ago), licensed BSD-3-Clause. It adds 145 tokens to every session and 4,340 once invoked, about $0.0007 per session on Opus 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 2026-08-30.
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