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name: security-scan description: Scan your OpenAI Codex configuration (.codex/ directory) for security vulnerabilities, misconfigurations, and injection risks using AgentShield. Checks CODEX.md, settings.json, MCP servers, hooks, and agent definitions. origin: ecc

Security Scan Skill

Audit your OpenAI Codex configuration for security issues using AgentShield.

When to Activate

• Setting up a new OpenAI Codex project
• After modifying .codex/settings.json, CODEX.md, or MCP configs
• Before committing configuration changes
• When onboarding to a new repository with existing OpenAI Codex configs
• Periodic security hygiene checks

What It Scans

File	Checks
CODEX.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 .codex/ directory:

# Scan current project
npx ecc-agentshield scan

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

# 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

Deep 4.6 Deep Analysis

Run the adversarial three-agent pipeline for deeper analysis:

# Requires OPENAI_API_KEY
export OPENAI_API_KEY=your-key
npx ecc-agentshield scan --deep --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 .codex/ configuration from scratch:

npx ecc-agentshield init

Creates:

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

GitHub Action

Add to your CI pipeline:

- uses: mehmet-turac/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 CODEX.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/mehmet-turac/agentshield
• npm: npmjs.com/package/ecc-agentshield