security-scan

SKILL.md

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 ecc-agentshield --version

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

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

Usage

Basic Scan

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

# Scan current project
npx ecc-agentshield scan

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

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

Output Formats

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

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

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

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

Auto-Fix

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

npx ecc-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 ecc-agentshield scan --opus --stream

This runs:

Attacker (Red Team) — finds attack vectors

Defender (Blue Team) — recommends hardening

Auditor (Final Verdict) — synthesizes both perspectives

Initialize Secure Config

Scaffold a new secure .claude/ configuration from scratch:

npx ecc-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/ecc-agentshield