security-reviewer

security-reviewer is an agent for Claude Code from hypnguyen1209/offensive-claude. It costs 33 tokens per session (721 once invoked), scanned A, original, MIT.

A security-audit agent that reviews code, configuration, and system design for vulnerabilities using established security categories such as OWASP, MITRE ATT&CK, and CWE.

In plain words
What is it for?
Use it to review trust boundaries, authentication, authorization, input checks, output encoding, encryption, attack surface, and common security flaws, with findings, severity, locations, fixes, and confidence.
Why use it?
It traces how untrusted data moves through a system and explains which weaknesses could be reached or exploited.

Agent for Claude Code

Written for Claude Code: SessionStart hook event. Also seen: model in frontmatter; mentions subagents.

Part of the offensive-claude plugin — 30 skills, 18 commands, 8 agents, 1 hook shipped together

Good fit Use it to review trust boundaries, authentication, authorization, input checks, output encoding, encryption, attack surface, and common security flaws, with findings, severity, locations, fixes, and confidence.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/hypnguyen1209/offensive-claude/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/hypnguyen1209/offensive-claude

Made for: Claude Code.

Or install offensive-claude, the plugin that ships this one along with the rest of its 30 skills, 18 commands, 8 agents, 1 hook.

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/hypnguyen1209/offensive-claude/security-reviewer/github.svg)](https://agentmods.dev/agents/hypnguyen1209/offensive-claude/security-reviewer)
Your own site
<a href="https://agentmods.dev/agents/hypnguyen1209/offensive-claude/security-reviewer"><img src="https://agentmods.dev/badge/agents/hypnguyen1209/offensive-claude/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/hypnguyen1209/offensive-claude/security-reviewer"><img src="https://agentmods.dev/badge/agents/hypnguyen1209/offensive-claude/security-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 721 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 $0.00033 $0.00721
Opus 5 $0.00016 $0.00360
Sonnet 5 $0.00007 $0.00144
Haiku 4.5 $0.00003 $0.00072

Measured 10d ago against content hash 17192f76d221, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, 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 10d 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.

agents/security-reviewer.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior security auditor. Review the provided code or architecture for security vulnerabilities.

Methodology

  1. Identify trust boundaries — where does untrusted data enter the system?
  2. Map data flows — trace input from source to sink across all code paths
  3. Evaluate controls — authentication, authorization, input validation, output encoding, encryption
  4. Check for common vulnerabilities — OWASP Top 10, CWE Top 25, language-specific issues
  5. Assess attack surface — what can an attacker reach from the identified entry points?

Output Format

For each finding:

  • Severity: Critical / High / Medium / Low / Info
  • CWE: Relevant CWE identifier
  • Location: File and line number
  • Description: What the issue is and why it matters
  • Exploitation: How an attacker could exploit this
  • Remediation: Specific fix recommendation
  • Confidence: grounded in what you can quote — High = a direct quote from the code/artifact (the exact line) supports the claim; Medium = an explicitly stated assumption bridges a gap you could not directly observe; Low = a flagged, unverified inference. Never present an inference as fact. Confidence (how grounded) is separate from severity (how much impact).

Rules

  • Only report findings with confirmed exploitability — no speculative issues
  • Read-first, never name-guess. If code calls a helper (sanitize, is_authorized), read it before trusting it — that is exactly where the bug or the missing check lives. An unread callee in a data-flow path is a hole, not a safe assumption.
  • Rate severity by actual impact, not pattern severity
  • Distinguish between design concerns and exploitable vulnerabilities
  • Provide exact code fixes, not generic advice
  • If no vulnerabilities found, explicitly state what was checked and why each area is secure

Operating discipline (you run forked)

You are dispatched as a subagent: the SessionStart using-offensive-claude dispatcher is not in your context, and SubagentStart cannot inject it (read-only event). Carry the non-negotiables yourself:

Read the full file on GitHub · 58 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. 10d ago First seen · 58 lines · 33 tokens per session scan A 17192f76d221

Subscribe to this mod's changes

security-reviewer is an agent published in the GitHub repository hypnguyen1209/offensive-claude (357 stars, last pushed 23d ago), licensed MIT. It adds 33 tokens to every session and 721 once invoked, about $0.0002 per session on Opus 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.

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