skill-scanner

Skill Security Scanner

Scan skills for malicious patterns before installation. Detects credential exfiltration, suspicious network calls, obfuscated code, prompt injection, and other red flags.

Quick Start

# Scan a local skill folder
python3 scripts/scan.py /path/to/skill

# Verbose output (show matched lines)
python3 scripts/scan.py /path/to/skill --verbose

# JSON output (for automation)
python3 scripts/scan.py /path/to/skill --json

Workflow: Scan Before Install

1. Download or locate the skill folder
2. Run python3 scripts/scan.py <skill-path> --verbose
3. Review findings by severity (CRITICAL/HIGH = do not install)
4. Report results to user with recommendation

Score Interpretation

Score	Meaning	Recommendation
CLEAN	No issues found	Safe to install
INFO	Minor notes only	Safe to install
REVIEW	Medium-severity findings	Review manually before installing
SUSPICIOUS	High-severity findings	Do NOT install without thorough manual review
DANGEROUS	Critical findings detected	Do NOT install — likely malicious

Exit Codes

• 0 = CLEAN/INFO
• 1 = REVIEW
• 2 = SUSPICIOUS
• 3 = DANGEROUS

Rules Reference

See references/rules.md for full list of detection rules, severity levels, and whitelisted domains.

Limitations

• Pattern-based detection — cannot catch all obfuscation techniques
• No runtime analysis — only static scanning
• False positives possible for legitimate tools that access network/files
• Always combine with manual review for HIGH/MEDIUM findings