MCP server DexAndroid

DexAndroid---Android Decompile MCP

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⚠️ For learning and teaching purposes only. Do not use this project for any illegal activity, unauthorized cracking, copyright infringement, or bypassing third-party protections. You must follow local laws and the target app’s terms. You are solely responsible for misuse.

Android unpacking + smali analysis MCP Server. Use from Cursor / Codex / Claude Code to manage devices, detect packers, unpack (static / BlackDex / Frida), convert dex→smali, and search API strings.

Repo: https://github.com/TimeCyber/DexAndroid · npm: android-decompile-mcp

---

Quick start (npm + MCP)

1. No clone — download & run from npm:

npx -y android-decompile-mcp

2. Load into Cursor / Claude / Codex — paste into .cursor/mcp.json (or global MCP config):

{
  "mcpServers": {
    "android-decompile-mcp": {
      "command": "npx",
      "args": ["-y", "android-decompile-mcp"],
      "env": {
        "ADB_PATH": "adb",
        "DEX_OUT_DIR": "./unpack-output"
      }
    }
  }
}

Save → restart the client / reload MCP. Done.

Optional global install: npm i -g android-decompile-mcp then run android-decompile-mcp.

---

Features

Capability	MCP tool	Notes
Devices	list_devices	Connected ADB devices
Packages	list_packages	Optional keyword filter
Packer detect	detect_packer	360 / Tencent / Bangcle / ijiami / Alibaba, etc.
Pull APK	pull_apk	Installed app (+ splits)
Static unpack	static_unpack	Extract classes*.dex
No-Root unpack	blackdex_prepare / blackdex_pull	BlackDex memory dump
Root unpack	frida_prepare / frida_unpack	frida-server + frida-dexdump
Decompile	dex_to_smali	baksmali → smali
Analyze	smali_list_classes / smali_read_class / smali_search	List / read / regex
Entry locate	find_app_entry	MAIN/LAUNCHER + smali onCreate (read-only)
Decode / rebuild	apk_decode / apk_repack	apktool decode + rebuild/sign

Unpacking methods

Method	Root?	Use when
Static	No	Unpacked apps or shell/resources only
BlackDex	No	Most protected apps
Frida	Yes	Strong packers / fuller dumps

---

Requirements

• Windows / macOS / Linux (docs use Windows examples)
• Node.js ≥ 18
• ADB on PATH, or set ADB_PATH
• Java 8+ (for baksmali via dex_to_smali)
• Optional: BlackDex; rooted device + frida-server; pip install frida-tools frida-dexdump

Place baksmali fat jar / frida-server / BlackDex under local tools/ (large binaries are gitignored).

---

Local development build

git clone https://github.com/TimeCyber/DexAndroid.git
cd DexAndroid
npm install
npm run build
npm start

---

Environment variables

Variable	Meaning	Default
ADB_PATH	adb executable	adb
DEX_OUT_DIR	Default output dir	<cwd>/unpack-output
BAKSMALI_JAR	baksmali jar	auto-discover under tools/

---

Typical workflows

1. Static unpack (fastest)

1. list_devices or prepare local apkPath.
2. detect_packer.
3. static_unpack → classes*.dex.
4. dex_to_smali → smali folder.
5. smali_search / smali_read_class.

Note: Protected apps often yield only the shell via static unpack—use BlackDex / Frida for business code.

2. No-Root (BlackDex)

1. list_devices.
2. blackdex_prepare with blackdexApkPath.
3. Unpack the target app in BlackDex UI.
4. blackdex_pull with targetPkg.
5. dex_to_smali then smali_*.

3. Root (Frida)

1. Rooted device (e.g. Magisk), adb ready.
2. frida_prepare to push/start tools/frida-server.
3. Matching frida / frida-dexdump locally (prefer 16.x).
4. frida_unpack with pkg, prefer spawn: true, deepSearch: true.
5. dex_to_smali on output, then analyze.

If Frida 17 attach fails, align tools to 16.x; some devices need temporary setenforce 0.

4. smali analysis examples

smali_list_classes  smaliDir=.../smali  keyword=login
smali_search        smaliDir=.../smali  pattern=https?://|/api/|publicClient/
smali_read_class    smaliDir=.../smali  className=com.example.api.ApiService

---

Layout

DexAndroid/
├── src/                 # MCP server (TypeScript)
│   ├── index.ts
│   ├── adb.ts
│   ├── detect.ts
│   ├── smali.ts
│   └── unpack/
├── dist/
├── examples/            # Damai / Huaxi sample smali.zip + docs
├── skills/              # Canonical agent skills (edit here, then sync)
├── .cursor/skills/      # Cursor copy
├── .agents/skills/      # Codex copy
├── .claude/skills/      # Claude Code copy
├── tools/               # baksmali / frida-server / BlackDex (local)
├── unpack-output/       # local dumps (gitignored)
├── package.json
└── README.md

Agent skills (Cursor / Codex / Claude Code)

After unpacking, use android-api-smali-analysis so the agent recovers headers, body, encrypt/decrypt methods, and keys (smali / .so / server-delivered), not path-only notes.

Client	Skill path
Canonical	skills/android-api-smali-analysis/SKILL.md
Cursor	.cursor/skills/android-api-smali-analysis/
Codex	.agents/skills/android-api-smali-analysis/
Claude Code	.claude/skills/android-api-smali-analysis/ (/android-api-smali-analysis)

Edit the canonical file, then sync copies:

node tools/sync-skills.mjs

See skills/README.md.

---

Decompile examples

See examples/ (smali shipped as zip):

Sample	Path	Contents
Damai	examples/damai/	Frida smali.zip + API docs
Huaxi Maternity	examples/huaxi/	Static smali.zip (info.cd120.two)

After unzip, run smali_list_classes / smali_search / smali_read_class.

---

MCP tool cheatsheet

Tool	Params
detect_packer	apkPath or pkg, optional serial
pull_apk	pkg, optional outDir / serial
static_unpack	apkPath or pkg, optional outDir
blackdex_prepare	blackdexApkPath, optional serial
blackdex_pull	targetPkg, optional outDir / serial
frida_prepare	optional serial / serverLocalPath
frida_unpack	pkg, optional spawn / deepSearch / outDir
dex_to_smali	dexInput, optional outDir
smali_list_classes	smaliDir, optional keyword
smali_read_class	smaliDir, className
smali_search	smaliDir, pattern, optional flags / maxResults
find_app_entry	projectDir / manifestPath / apkPath, optional smaliDir（只读定位入口）
apk_decode	apkPath, optional outDir（apktool 解码）
apk_repack	projectDir, optional outApk / keystore 参数（重建并签名）
smali_patch	mode + smaliPath/projectDir；调用方 content 或 insert_verify_log

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FAQ

Q: Empty list_devices?
Check USB debugging, adb devices, pass serial if multiple.

Q: No business classes after static unpack?
Likely packed—use BlackDex or Frida.

Q: dex_to_smali failed?
Install Java; put baksmali jar in tools/ or set BAKSMALI_JAR.

Q: Frida jailed / version mismatch?
Keep frida-server and host frida major versions aligned; try 16.x.

Q: Where is output?
Default unpack-output/ (or DEX_OUT_DIR). Do not commit dumps.

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Legal & disclaimer

This project is only for learning, teaching, and authorized security research. It is strictly forbidden to use it for any criminal or illegal activity, including unauthorized access, cracking, piracy, attacking systems, or IP infringement. Authors and contributors are not liable for misuse. By using this software you agree to these terms.

⚠️ For learning and teaching purposes only. Do not use this project for any illegal activity, unauthorized cracking, copyright infringement, or bypassing third-party protections. You must follow local laws and the target app’s terms. You are solely responsible for misuse.

---

License

MIT — see LICENSE.