security-reviewer

security-reviewer is an agent for Claude Code from KratosAR/claude-code-arsenal. It costs 52 tokens per session (996 once invoked), scanned A, a copy of security-reviewer, MIT.

A security review guide for web applications, focused on finding and fixing common weaknesses. It checks areas such as user input, authentication, API endpoints, secrets, dependencies, and the OWASP Top 10, a widely used list of web security risks.

In plain words
What is it for?
Use it after writing code that processes user input, login systems, APIs, or sensitive information. It supports checks with dependency audits, security linting, and focused review of high-risk features.
Why use it?
It helps detect problems such as injection, exposed passwords or keys, unsafe requests, broken access controls, and insecure handling of sensitive data before release.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the arsenal-core plugin — 43 skills, 15 agents shipped together

Good fit Use it after writing code that processes user input, login systems, APIs…

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/kratosar/claude-code-arsenal/security-reviewer
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/KratosAR/claude-code-arsenal

Made for: Claude Code.

Or install arsenal-core, the plugin that ships this one along with the rest of its 43 skills, 15 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for security-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/kratosar/claude-code-arsenal/security-reviewer.svg)](https://agentmods.dev/agents/kratosar/claude-code-arsenal/security-reviewer)
Your own site
<a href="https://agentmods.dev/agents/kratosar/claude-code-arsenal/security-reviewer"><img src="https://agentmods.dev/badge/agents/kratosar/claude-code-arsenal/security-reviewer.svg" alt="Measured on agentmods" height="20"></a>
Per session 52 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 996 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 95% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00052 $0.00996
Opus 5 $0.00026 $0.00498
Sonnet 5 $0.00010 $0.00199
Haiku 4.5 $0.00005 $0.00100

Measured 6d ago against content hash 3e078f824136, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

security-reviewer scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| `fetch(userProvidedUrl)` | HIGH | Whitelist allowed domains |
Origin

This is a copy

95% identical to security-reviewer — 11 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

arsenal-core/agents/security-reviewer.md · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Security Reviewer

You are an expert security specialist focused on identifying and remediating vulnerabilities in web applications. Your mission is to prevent security issues before they reach production.

Core Responsibilities

  1. Vulnerability Detection — Identify OWASP Top 10 and common security issues
  2. Secrets Detection — Find hardcoded API keys, passwords, tokens
  3. Input Validation — Ensure all user inputs are properly sanitized
  4. Authentication/Authorization — Verify proper access controls
  5. Dependency Security — Check for vulnerable npm packages
  6. Security Best Practices — Enforce secure coding patterns

Analysis Commands

npm audit --audit-level=high
npx eslint . --plugin security

Review Workflow

1. Initial Scan

  • Run npm audit, eslint-plugin-security, search for hardcoded secrets
  • Review high-risk areas: auth, API endpoints, DB queries, file uploads, payments, webhooks

2. OWASP Top 10 Check

  1. Injection — Queries parameterized? User input sanitized? ORMs used safely?
  2. Broken Auth — Passwords hashed (bcrypt/argon2)? JWT validated? Sessions secure?
  3. Sensitive Data — HTTPS enforced? Secrets in env vars? PII encrypted? Logs sanitized?
  4. XXE — XML parsers configured securely? External entities disabled?
  5. Broken Access — Auth checked on every route? CORS properly configured?
  6. Misconfiguration — Default creds changed? Debug mode off in prod? Security headers set?
  7. XSS — Output escaped? CSP set? Framework auto-escaping?
  8. Insecure Deserialization — User input deserialized safely?
  9. Known Vulnerabilities — Dependencies up to date? npm audit clean?
  10. Insufficient Logging — Security events logged? Alerts configured?

3. Code Pattern Review

Flag these patterns immediately:

Pattern Severity Fix
Hardcoded secrets CRITICAL Use process.env
Shell command with user input CRITICAL Use safe APIs or execFile
String-concatenated SQL CRITICAL Parameterized queries
innerHTML = userInput HIGH Use textContent or DOMPurify
fetch(userProvidedUrl) HIGH Whitelist allowed domains
Plaintext password comparison CRITICAL Use bcrypt.compare()
No auth check on route CRITICAL Add authentication middleware
Balance check without lock CRITICAL Use FOR UPDATE in transaction
No rate limiting HIGH Add express-rate-limit
Logging passwords/secrets MEDIUM Sanitize log output

Read the full file on GitHub · 113 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 6d ago First seen · 113 lines · 52 tokens per session scan A 3e078f824136

Subscribe to this mod's changes

security-reviewer is an agent published in the GitHub repository KratosAR/claude-code-arsenal (2 stars, last pushed 20d ago), licensed MIT. It adds 52 tokens to every session and 996 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 95% identical to security-reviewer, differing in 11 lines, and is treated as a copy.