openclaw/skulk-skill-scanner

Skill Scanner

Security scanner for OpenClaw agent skills. Static analysis for red flags.

Usage

node scripts/scanner.js <path-to-skill> [--verbose] [--json] [--summary] [--ignore <path>] [--include-self]

Examples

# Scan a downloaded skill folder before enabling it
clawhub inspect some-skill
node scripts/scanner.js ./skills/some-skill --verbose

# Scan your own skill before publishing
node scripts/scanner.js ./skills/my-skill

# JSON output for automation
node scripts/scanner.js ./skills/my-skill --json

# One-line summary output for heartbeat checks
node scripts/scanner.js ./skills/my-skill --summary

# Include scanner internals (off by default to reduce self-scan noise)
node scripts/scanner.js ./skills/skulk-skill-scanner --include-self

What It Catches

| Severity | Flags | |----------|-------| | 🔴 Critical | Data exfiltration, credential access, safety overrides, destructive commands | | 🟠 High | Obfuscation (base64/eval), unknown network access, env scanning, privilege escalation, hidden instructions | | 🟡 Medium | Writes outside workspace, package installs (supply chain), messaging on user's behalf, persistent timers/automation | | 🔵 Info | API key references, broad tool access requests |

Scoring

• Each unique rule deducts points: critical=30, high=15, medium=5, info=0
• Score 75-100: ✅ PASS
• Score 50-74: ⚠️ WARN
• Score 0-49 or any critical: ❌ FAIL
• Exit code 1 on FAIL (CI-friendly)

Safe Domain Allowlist

Known legitimate API domains are allowlisted to reduce false positives on network-related rules. Edit the SAFE_DOMAINS array in scripts/scanner.js to customize.

Limitations

This is static pattern matching — it catches obvious and moderately obfuscated attacks but cannot detect:

• Sophisticated multi-step social engineering
• Runtime-generated URLs or dynamic exfiltration
• Attacks that look identical to legitimate skill behavior

It's a first line of defense, not a guarantee. Always review skills manually before granting sensitive access.