Agent Shield

Give your AI a health check.

One scan. Thirteen engines. One report.

中文文档

You found an MCP Server / Skill / Plugin online and want to install it. But you're wondering:

Is this thing safe? Will it steal my API keys? Hijack my AI? Mine crypto?

AgentShield answers that in seconds. One command, 13 independent scanning engines, one clear report.

npx @elliotllliu/agent-shield scan ./that-thing-you-want-to-install

That's it. First run auto-installs all engines. After that, results come in seconds.

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See It In Action

🛡️  安全检测报告
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

📁 检测对象:  ./mcp-puppeteer
🔧 检测引擎:  13 个独立扫描器
⏱  总耗时:    50.2s

──────────────────────────────────────────────────────
🔍 各方检测结论
──────────────────────────────────────────────────────

📋 AgentShield — 内置参考（AI Agent 基础检查）
   结论: ⚠️ 发现 1 处需关注
   • 代码混淆  📍 src/index.ts:1

🔍 Aguara — 通用代码安全
   结论: ✅ 未发现风险

🔎 Semgrep — 代码质量与注入检测
   结论: ✅ 未发现风险

🧪 Invariant — MCP Tool Poisoning 检测
   结论: ✅ 未发现风险

🔬 Trivy — 漏洞扫描 + 密钥检测
   结论: ✅ 未发现风险

🔑 Gitleaks — 密钥和 Token 泄露
   结论: ✅ 未发现风险

🐍 Bandit — Python 代码安全
   结论: ✅ 未发现风险

📡 Bearer — 数据流 + 隐私分析
   结论: ✅ 未发现风险

──────────────────────────────────────────────────────
📊 综合结论
──────────────────────────────────────────────────────

✅ 所有引擎均未检出风险
   （7/7 个外部引擎未检出风险）

  ✅ 后门/远程控制  — 7 个引擎均未检出
  ✅ 数据窃取       — 7 个引擎均未检出
  ✅ Prompt 注入    — 7 个引擎均未检出
  ✅ 挖矿行为       — 7 个引擎均未检出

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

One glance: 7 out of 7 external engines say it's clean. All major threats cleared. Safe to install.

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Why Trust It?

Because it's not one engine making the call. It's 13 independent scanning engines, each a specialist in their own domain. We bring them together:

Engine	What it's best at
📋 AgentShield (reference)	AI Agent basics — skill hijack, prompt injection, MCP runtime
🔍 Aguara	General security — 177 rules, data exfil, taint tracking
🔎 Semgrep	Code quality — 2000+ rules, injection, XSS, hardcoded secrets
🧪 Invariant	MCP-specific — tool poisoning, cross-origin escalation, rug pull
🔬 Trivy	Vulnerability scan + secret detection + SBOM
🔑 Gitleaks	Secret and token leak detection
🐍 Bandit	Python code security
📡 Bearer	Data flow + privacy analysis
🐕 TruffleHog	Secret detection + verification if active
🌐 OSV-Scanner	Dependency vulnerabilities (Google OSV database)
🦑 Grype	Dependency vulnerability scanning
🟢 njsscan	Node.js / JavaScript security
🔐 detect-secrets	Secret detection (Yelp)

Each engine has its own strengths. We combine all of them into one report.

The built-in engine is reference-only — the overall conclusion is decided by the 7 external engines' consensus. The stronger they get, the stronger we get.

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First Run

First time you run it, engines are auto-installed (to ~/.agentshield/, no sudo needed):

🔧 检查引擎...
  ✅ AgentShield — 已就绪
  📦 Aguara — 正在安装... 完成
  📦 Semgrep — 正在安装... 完成
  📦 Invariant — 正在安装... 完成
  📦 Trivy — 正在安装... 完成
  📦 Gitleaks — 正在安装... 完成
  📦 Bandit — 正在安装... 完成
  📦 Bearer — 正在安装... 完成

One-time setup. After that, it's instant.

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What Can It Detect?

Risk	What it means
🔴 Skill Hijack	It's secretly modifying your AI's config
🔴 Backdoor	It can silently execute arbitrary code
🔴 Remote Control	It's connecting to external servers + opening a shell
⚠️ Data Theft	It reads your keys/files and sends them out
⚠️ Prompt Injection	It's secretly adding instructions to your AI
⚠️ Tool Poisoning	Hidden malicious instructions in tool descriptions
⚠️ Obfuscated Code	Code is intentionally unreadable — might be hiding something
⚠️ Vulnerabilities	Known CVEs in dependencies
⚠️ Secret Leaks	API keys, tokens, passwords in source code
ℹ️ Excessive Permissions	It asks for more than it needs

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More Options

# HTML report (shareable)
agent-shield scan ./dir --html -o report.html

# JSON (for CI/CD)
agent-shield scan ./dir --json

# Chinese report (default)
agent-shield scan ./dir --lang zh

# SARIF (GitHub Code Scanning)
agent-shield scan ./dir --sarif -o results.sarif

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Install

# Recommended: use npx, nothing to install
npx @elliotllliu/agent-shield scan ./my-skill/

# Or install globally
npm install -g @elliotllliu/agent-shield

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Our Philosophy

"We don't compete — we aggregate."

We bring every engine's strengths together, cross-validate their findings, and produce one unified report. The stronger each engine gets, the stronger AgentShield gets.

We're the X-ray machine, not the doctor. We show you what's inside — you decide whether to install it.

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License

MIT