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 trilwu/secskills --skill reversing-flutter-appsgit clone --depth 1 https://github.com/trilwu/secskillsWrote 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/trilwu/secskills/reversing-flutter-apps)<a href="https://agentmods.dev/skills/trilwu/secskills/reversing-flutter-apps"><img src="https://agentmods.dev/badge/skills/trilwu/secskills/reversing-flutter-apps/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/trilwu/secskills/reversing-flutter-apps"><img src="https://agentmods.dev/badge/skills/trilwu/secskills/reversing-flutter-apps.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00092 | $0.02004 |
| Opus 5 | $0.00046 | $0.01002 |
| Sonnet 5 | $0.00018 | $0.00401 |
| Haiku 4.5 | $0.00009 | $0.00200 |
Grade A, and why
reversing-flutter-apps 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 9d 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 — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Reversing Flutter Apps
Flutter breaks both halves of the standard mobile workflow at once. Dart is AOT-compiled to a native snapshot, so there is no dex for jadx to decompile — and the Flutter engine ships its own BoringSSL with its own trust store, so it ignores the system proxy and the user CA store, and your interception proxy sees nothing. Neither failure is obvious from the symptoms, which is why people burn hours on this before recognizing what they are looking at.
When to Use
jadxon the APK shows a near-emptyMainActivityand little else- The APK contains
lib/arm64-v8a/libflutter.soandlibapp.so, orassets/flutter_assets/ - An IPA contains
Frameworks/App.frameworkandFrameworks/Flutter.framework - Burp, mitmproxy, or Charles shows zero traffic from an app that is plainly making network calls
- You need to recover Dart class and method names, or find the API layer, in a release build
When NOT to Use
- Ordinary Java/Kotlin Android apps — use
testing-mobile-applications - React Native (
index.android.bundle, Hermes) — usereversing-react-native-apps - Unity (
global-metadata.dat,libil2cpp.so) — usereversing-unity-il2cpp - The backend the app talks to — use
testing-apisonce you can see traffic - Generic native
.soreversing — useanalyzing-binaries
Identify the Build First
The build mode decides everything that follows. Check before installing tools.
unzip -l target.apk | rg 'libflutter|libapp|flutter_assets|kernel_blob'
| What you see | Build | What it means |
|---|---|---|
libapp.so + libflutter.so |
AOT release | The normal case. Dart compiled to a native snapshot — this skill's main path |
assets/flutter_assets/kernel_blob.bin |
Debug / JIT | Far easier: Dart kernel bytecode, and the VM service may be reachable |
App.framework/App (iOS) |
AOT release | Same as libapp.so; extract from the decrypted IPA |
Only arm64-v8a present |
— | Expected; blutter targets arm64. armeabi-v7a support is weaker |
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.
- 9d ago First seen · 170 lines · 92 tokens per session scan A 66ce03bd3c35
reversing-flutter-apps is a skill published in the GitHub repository trilwu/secskills (137 stars, last pushed 5d ago), licensed MIT. It adds 92 tokens to every session and 2,004 once invoked, about $0.0005 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 2026-08-30.
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