Android Reverse Engineering Agent Skill

Guides the end-to-end workflow for decompiling, analyzing, modifying, and reconstructing Android APK packages.

Context cost
5.4k tokensestimated from the bundle, loaded when it triggers
Bundle
6 files · 33.1 kB4 scripts among them — read before you run
Licence
not declarednone named by its author
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

安卓 APK 逆向还原代码的完整工作流。当用户需要对 APK 进行逆向分析、还原 Java/Kotlin 源码、 解码资源文件、反编译原生 so 库、重打包签名或动态调试时使用。覆盖从静态分析到动态调试的 全流程,支持资源还原、DEX 反编译、Smali 改造、重打包签名、so 库分析、Frida Hook。 触发词:逆向、反编译、还原代码、apk 分析、jadx、apktool、smali、so 库、frida、hook。

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

androidmobile

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md18.5 kB · preview
--- name: android-reverse-jinn metadata: allowed-tools: - Bash - Read - Glob - Grep - Edit - Write ---
18# 安卓 APK 逆向还原代码
19
20安卓应用逆向工程的系统化工作流。用于分析一个 .apk 包,还原其 Java/Kotlin 逻辑、
21解码资源、分析原生层,并在必要时修改、重打包和重签名。
22
23## 环境前置
24
25在开始前,确认以下工具已在电脑上可用(版本建议):
26
27| 工具 | 用途 | 安装/检查命令 |
28|------|------|--------------|
29| JDK 17+ | 运行环境(jadx/apktool 需要) | java -version |
30| jadx | Java/Kotlin 源码反编译(首选命令行 CLI,适配 OpenCode;亦支持导出 Gradle 工程骨架) | jadx --version |
31| apktool | 解码资源 / Smali / 重打包(PC 运行时需 java -jar 或 PATH 安装;scripts/ 下的 extract.sh/repack_sign.sh 已自动适配:优先 PATH 命令,否则自动探测脚本上级/当前目录的 apktool*.jar 用 java -jar 调用,可用 APKTOOL_JAR 环境变量显式指定 jar 路径) | apktool --version |
32| unzip | 查看 APK 原始包结构 | which unzip |
33| zipalign | 重打包后 zip 对齐(签名前) | zipalign(位于 SDK build-tools) |
34| radare2(r2 框架) | 反汇编/解析 lib/*.so 原生库(开源) | r2 --version、rabin2 -v |
35| Frida + objection | 动态 Hook / 运行时分析 | frida --version |
36| apksigner | 重打包后签名(Android SDK build-tools) | apksigner --version |
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md1,308 words
Files6
Licencenot declared
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈90
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
5,310
on trigger
The instruction body and 5 supporting files, read only when the skill fires.
2.7%
of a 200k window
Ten skills this size would take about 27% of the window before you open a file.
050k100k150k200k context window

5.4k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

6 files, 33.1 kB on disk. Mostly text — the instructions the model reads — with 4 scripts in it that your client would run only if the instructions tell it to.

  • SKILL.md18.5 kB
  • README.md3.1 kB
  • scripts/analyze_so.sh5.4 kB
  • scripts/decompile.sh1.1 kB
  • scripts/extract.sh2.2 kB
  • scripts/repack_sign.sh2.8 kB
What is not in it

A skill installs nothing and depends on nothing: it is a folder your client reads. This one carries 4 scripts beside the text, so the bundle is 6 files you can review in full before installing.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Android Reverse Engineering · 5.4k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/android-reverse-engineering/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/android-reverse-engineering" ] && { [ ! -e .claude/skills/android-reverse-engineering ] || { mv .claude/skills/android-reverse-engineering "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/android-reverse-engineering" .claude/skills/ && echo "Installed .claude/skills/android-reverse-engineering"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add yezijinn/android-reverse-engineering

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/android-reverse-engineering/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/android-reverse-engineering/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/android-reverse-engineering" ] && { [ ! -e ~/.claude/skills/android-reverse-engineering ] || { mv ~/.claude/skills/android-reverse-engineering "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/android-reverse-engineering" ~/.claude/skills/ && echo "Installed ~/.claude/skills/android-reverse-engineering" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/android-reverse-engineering/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as android-reverse-jinn in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, android-reverse-engineering.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referenceyezijinn/android-reverse-engineering

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

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