security-scan

name	security-scan
description	Scan your Claude Code configuration (.claude/ directory) for security vulnerabilities, misconfigurations, and injection risks using AgentShield. Checks CLAUDE.md, settings.json, MCP servers, hooks, and agent definitions.
origin	Multiversal

Security Scan Skill

Audit your Claude Code configuration for security issues using AgentShield.

When to Activate

• Setting up a new Claude Code project
• After modifying .claude/settings.json, CLAUDE.md, or MCP configs
• Before committing configuration changes
• When onboarding to a new repository with existing Claude Code configs
• Periodic security hygiene checks

What It Scans

File	Checks
CLAUDE.md	Hardcoded secrets, auto-run instructions, prompt injection patterns
settings.json	Overly permissive allow lists, missing deny lists, dangerous bypass flags
mcp.json	Risky MCP servers, hardcoded env secrets, npx supply chain risks
hooks/	Command injection via interpolation, data exfiltration, silent error suppression
agents/*.md	Unrestricted tool access, prompt injection surface, missing model specs

Prerequisites

AgentShield must be installed. Check and install if needed:

# Check if installed
npx multiversal-agentshield --version

# Install globally (recommended)
npm install -g multiversal-agentshield

# Or run directly via npx (no install needed)
npx multiversal-agentshield scan .

Usage

Basic Scan

Run against the current project's .claude/ directory:

# Scan current project
npx multiversal-agentshield scan

# Scan a specific path
npx multiversal-agentshield scan --path /path/to/.claude

# Scan with minimum severity filter
npx multiversal-agentshield scan --min-severity medium

Output Formats

# Terminal output (default) — colored report with grade
npx multiversal-agentshield scan

# JSON — for CI/CD integration
npx multiversal-agentshield scan --format json

# Markdown — for documentation
npx multiversal-agentshield scan --format markdown

# HTML — self-contained dark-theme report
npx multiversal-agentshield scan --format html > security-report.html

Auto-Fix

Apply safe fixes automatically (only fixes marked as auto-fixable):

npx multiversal-agentshield scan --fix

This will:

• Replace hardcoded secrets with environment variable references
• Tighten wildcard permissions to scoped alternatives
• Never modify manual-only suggestions

Opus 4.6 Deep Analysis

Run the adversarial three-agent pipeline for deeper analysis:

# Requires ANTHROPIC_API_KEY
export ANTHROPIC_API_KEY=your-key
npx multiversal-agentshield scan --opus --stream

This runs:

1. Attacker (Red Team) — finds attack vectors
2. Defender (Blue Team) — recommends hardening
3. Auditor (Final Verdict) — synthesizes both perspectives

Initialize Secure Config

Scaffold a new secure .claude/ configuration from scratch:

npx multiversal-agentshield init

Creates:

• settings.json with scoped permissions and deny list
• CLAUDE.md with security best practices
• mcp.json placeholder

GitHub Action

Add to your CI pipeline:

- uses: affaan-m/agentshield@v1
  with:
    path: '.'
    min-severity: 'medium'
    fail-on-findings: true

Severity Levels

Grade	Score	Meaning
A	90-100	Secure configuration
B	75-89	Minor issues
C	60-74	Needs attention
D	40-59	Significant risks
F	0-39	Critical vulnerabilities

Interpreting Results

Critical Findings (fix immediately)

• Hardcoded API keys or tokens in config files
• Bash(*) in the allow list (unrestricted shell access)
• Command injection in hooks via ${file} interpolation
• Shell-running MCP servers

High Findings (fix before production)

• Auto-run instructions in CLAUDE.md (prompt injection vector)
• Missing deny lists in permissions
• Agents with unnecessary Bash access

Medium Findings (recommended)

• Silent error suppression in hooks (2>/dev/null, || true)
• Missing PreToolUse security hooks
• npx -y auto-install in MCP server configs

Info Findings (awareness)

• Missing descriptions on MCP servers
• Prohibitive instructions correctly flagged as good practice

Links

• GitHub: github.com/affaan-m/agentshield
• npm: npmjs.com/package/multiversal-agentshield