re-flutter

re-flutter is a skill for Claude Code from dslsdzc/rev-skills. It costs 60 tokens per session (6,119 once invoked), scanned A, original, Apache-2.0.

A guide to examining Flutter and Dart mobile apps by analyzing their compiled machine-code snapshots and, when needed, observing them in a controlled device or emulator.

In plain words
What is it for?
Use it to study a Flutter app’s network requests, signatures, encryption, protocols, or communication between Dart and native code.
Why use it?
Flutter apps store much of their business logic in compiled files, which can be difficult to inspect with ordinary source-code tools.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Good fit Use it to study a Flutter app’s network requests, signatures, encryption, protocols, or communication between Dart and native code.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/dslsdzc/rev-skills/re-flutter
Install

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.

Any agent
npx skills add dslsdzc/rev-skills --skill re-flutter
Clone the repo
git clone --depth 1 https://github.com/dslsdzc/rev-skills

Made for: Claude Code.

Wrote 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.

agentmods badge for re-flutter

README.md
[![agentmods](https://agentmods.dev/badge/skills/dslsdzc/rev-skills/re-flutter.svg)](https://agentmods.dev/skills/dslsdzc/rev-skills/re-flutter)
Your own site
<a href="https://agentmods.dev/skills/dslsdzc/rev-skills/re-flutter"><img src="https://agentmods.dev/badge/skills/dslsdzc/rev-skills/re-flutter.svg" alt="Measured on agentmods" height="20"></a>
Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,119 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00060 $0.06119
Opus 5 $0.00030 $0.03060
Sonnet 5 $0.00012 $0.01224
Haiku 4.5 $0.00006 $0.00612

Measured 8d ago against content hash e05f25e72612, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

re-flutter scanned grade A 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 8d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl http://127.0.0.1:8181/getVM
.claude/skills/re-flutter/SKILL.md · 157 lines

How it starts

The opening of the file, as written. The whole thing — 157 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Flutter / Dart AOT 逆向(快照解析 / 符号还原 / VM 动态分析)

何时使用 / 何时不用

  • 用:Android 包内发现 lib/<abi>/libapp.so(Dart AOT 快照)与 libflutter.so(引擎)——业务逻辑在 libapp.so
  • 用:iOS 的 App.framework/App(AOT 快照嵌入 Mach-O,Flutter.framework 为引擎)
  • 用:debug 构建的 assets/flutter_assets/kernel_blob.bin(Dart kernel 二进制,含类/函数名与 AST)
  • 用:需要还原 Flutter App 的 Dart 业务逻辑(网络接口、签名/加密算法、协议、MethodChannel 通道)
  • 不用:纯原生 Android App(无 libapp.so / kernel_blob,走 [[re-apk]])
  • 不用:纯原生 iOS App(无 App.framework,走 [[re-ios]])
  • 不用:Flutter Web(产物是 JS/WASM 而非快照,走 [[re-wasm]])
  • 不用:引擎层本身(libflutter.so / Flutter.framework 内部逻辑,见步骤 4)
  • 注意:动态步骤在受控设备 / 模拟器快照内执行([[platform-tips]] 最高原则);静态优先(大型样本原则)

工具准备

参考 [[platform-tips]]——Flutter 产物大(libapp.so 数十 MB 起),遵循「静态优先(大型样本)」:先静态定位、动态按需补充;动态(运行 / 重打包 App)默认在受控设备 / 模拟器快照内。

python3(快照头部 / 分区解析主力)

  • Linux: apt install python3 / dnf install python3 / pacman -S python
  • macOS: 自带;Windows: 官方安装器或 choco install python
  • 验证: python3 --version

binutils(readelf / strings / objcopy,快照定位与段提取)

  • Debian/Ubuntu: apt install binutils;Fedora: dnf install binutils;Arch: pacman -S binutils
  • macOS: Xcode 命令行工具自带(xcode-select --install
  • Windows: 无自带 binutils——用 WSL,或 Ghidra 内置解析替代
  • 验证: readelf --version && strings --version

Ghidra(指令段反汇编 / 反编译与交叉引用)

  • 装法与验证见 [[re-ghidra]];无 Ghidra 时 IDA / radare2 等价([[re-ida]] / [[re-radare2]])
  • 验证: 导入 libapp.so 后能定位 _kDart* 符号

frida(动态侧,Dart VM 入口 hook)

  • 安装、frida-server 部署与版本匹配见 [[re-frida]] 工具准备(主机与设备版本必须一致)
  • 验证: frida --versionfrida-ps -U 列出设备进程

blutter(AOT 快照自动还原,可选)

  • release libapp.so 的类/函数/对象池自动还原,安装与用法见 [[re-hybrid-app]] 工具准备;本技能步骤 2 以手动解析为核心方法,blutter 作自动化替代与核对
  • 验证: 输出目录出现 pp.txt 且含目标 App 类名

操作步骤

按顺序执行;每步产物(段提取 / 解析脚本 / hook 脚本 + sha256)存档。

  1. 识别构建模式(debug / release)
    unzip -l app.apk | grep -E 'kernel_blob|libapp|libflutter'    # Android 容器内定位
    file lib/arm64-v8a/libapp.so
    readelf -sW lib/arm64-v8a/libapp.so | grep _kDart             # release: AOT 快照符号
    xxd -l 32 assets/flutter_assets/kernel_blob.bin               # debug: "KERNEL" magic
    strings -n 6 libapp.so | grep -c SNAPSHOT                     # AOT 数据段 magic 命中
    
    • debug: assets/flutter_assets/kernel_blob.bin 存在(头部 "KERNEL" magic,Dart kernel 二进制,类/函数名与 AST 保留,还原成本低)→ 直接步骤 3
    • release: 无 kernel_blob,业务代码在 libapp.so 的 _kDartIsolateSnapshotData(数据)/ _kDartIsolateSnapshotInstructions(指令)→ 步骤 2
    • iOS: Payload/<App>.app/Frameworks/App.framework/App(业务)与 Flutter.framework/Flutter(引擎),Mach-O 内同段名,otool -l / strings 定位

Read the full file on GitHub · 157 lines

Changes

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.

  1. 8d ago First seen · 157 lines · 60 tokens per session scan A e05f25e72612

Subscribe to this mod's changes

re-flutter is a skill published in the GitHub repository dslsdzc/rev-skills (46 stars, last pushed 9d ago), licensed Apache-2.0. It adds 60 tokens to every session and 6,119 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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