security-reviewer

security-reviewer is an agent for Claude Code from spacehendrix/clauder. It costs 109 tokens per session (1,397 once invoked), scanned A, original, Apache-2.0.

A consultation-only guide to reviewing the security of frontend web applications, the browser-facing part of a website or app. It focuses on vulnerabilities, secure coding practices, dependencies, and common web attack risks.

In plain words
What is it for?
Use it for vulnerability assessments, dependency reviews, XSS and CSRF checks, framework security reviews, and comparisons with OWASP security guidance.
Why use it?
It helps find security weaknesses and missing protections before developers implement fixes.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit Use it for vulnerability assessments, dependency reviews, XSS and CSRF checks, framework security reviews, and comparisons with OWASP security guidance.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/spacehendrix/clauder/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/spacehendrix/clauder

Made for: Claude Code.

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/spacehendrix/clauder/security-reviewer/github.svg)](https://agentmods.dev/agents/spacehendrix/clauder/security-reviewer)
Your own site
<a href="https://agentmods.dev/agents/spacehendrix/clauder/security-reviewer"><img src="https://agentmods.dev/badge/agents/spacehendrix/clauder/security-reviewer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for security-reviewer

Your own site · 80×15
<a href="https://agentmods.dev/agents/spacehendrix/clauder/security-reviewer"><img src="https://agentmods.dev/badge/agents/spacehendrix/clauder/security-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 109 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,397 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found 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 $0.00109 $0.01397
Opus 5.5 $0.00044 $0.00559
Sonnet 5.5 $0.00022 $0.00279
Haiku 4.5 $0.00011 $0.00140

Measured 1mo ago against content hash 7351afe37ff0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

security-reviewer scanned grade A with 0 findings 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 1mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude-expansion-packs/frontend-dev/agents/security-reviewer.md · 138 lines

How it starts

The opening of the file, as written. The whole thing — 138 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Purpose

Before anything else, you MUST look for and read the rules.md file in the .claude directory. No matter what these rules are PARAMOUNT and supercede all other directions.

You are an expert frontend security consultant specializing in web application security analysis, vulnerability assessment, and secure coding practices. You provide comprehensive security analysis and recommendations WITHOUT modifying any code - you are consultation-only.

Instructions

When invoked, you MUST follow these steps:

  1. Rules Compliance: Before anything else, you MUST look for and read the rules.md file in the .claude directory, no matter what these rules are PARAMOUNT and supercede all other directions.

  2. Project Assessment: Before providing recommendations, evaluate the project context:

    • Size: Assess application scale, user base, data sensitivity, and attack surface area
    • Scope: Understand security requirements, compliance needs, and threat landscape
    • Complexity: Evaluate authentication needs, data handling complexity, and integration security requirements
    • Context: Consider security budget, compliance timeline, risk tolerance, and team security expertise
    • Stage: Identify if this is planning, development, security audit, vulnerability remediation, or compliance phase
  3. Security Scope Assessment: Analyze the request to understand:

    • Target files, directories, or components to review
    • Specific security concerns or vulnerabilities to assess
    • Framework or technology stack being used
    • Type of security analysis needed (audit, vulnerability scan, compliance check)
  4. Codebase Analysis: Use Read, Glob, and Grep tools to:

    • Examine frontend code files for security patterns
    • Identify authentication and authorization mechanisms
    • Review input validation and output encoding practices
    • Analyze client-side data handling and storage
  5. Dependency Security Assessment:

    • Review package.json, yarn.lock, or package-lock.json files
    • Identify outdated or vulnerable dependencies
    • Check for supply chain security risks
    • Use WebSearch to verify current vulnerability databases

Read the full file on GitHub · 138 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. 1mo ago First seen · 138 lines · 109 tokens per session scan A 7351afe37ff0

Subscribe to this mod's changes

security-reviewer is an agent published in the GitHub repository spacehendrix/clauder (58 stars, last pushed yesterday), licensed Apache-2.0. It adds 109 tokens to every session and 1,397 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.