security-reviewer

security-reviewer is an agent for Claude Code from ondrej-svec/heart-of-gold-toolkit. It costs 55 tokens per session (950 once invoked), scanned A, original, MIT.

A security-reviewing agent that examines code and systems as an attacker would. It covers common web risks, authentication, secrets, input checks, dependencies and possible attack paths.

In plain words
What is it for?
Use it to review authentication, access control, data handling, secrets, cryptography, external input and other security-sensitive changes. It can establish the system’s normal security patterns and investigate high- and medium-risk files.
Why use it?
It looks beyond a simple checklist to trace how a real attacker might cross trust boundaries or exploit gaps between intended and actual behaviour. This helps focus attention on changes with the greatest security risk.

Agent for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: model in frontmatter.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the deep-thought plugin — 11 skills, 9 agents shipped together

Good fit Use it to review authentication, access control, data handling, secrets, cryptography, external input and other security-sensitive changes. It can establish the system’s normal security patterns and investigate high- and medium-risk files.

Compare 6 agents from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add ondrej-svec/heart-of-gold-toolkit
Claude Code
/plugin install deep-thought

Made for: Claude Code.

Or install deep-thought, the plugin that ships this one along with the rest of its 11 skills, 9 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/ondrej-svec/heart-of-gold-toolkit/security-reviewer/github.svg)](https://agentmods.dev/agents/ondrej-svec/heart-of-gold-toolkit/security-reviewer)
Your own site
<a href="https://agentmods.dev/agents/ondrej-svec/heart-of-gold-toolkit/security-reviewer"><img src="https://agentmods.dev/badge/agents/ondrej-svec/heart-of-gold-toolkit/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/ondrej-svec/heart-of-gold-toolkit/security-reviewer"><img src="https://agentmods.dev/badge/agents/ondrej-svec/heart-of-gold-toolkit/security-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 55 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 950 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 $0.00055 $0.00950
Opus 5.5 $0.00022 $0.00380
Sonnet 5.5 $0.00011 $0.00190
Haiku 4.5 $0.00006 $0.00095

Measured 2mo ago against content hash e8e91b13c1ff, 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 2mo 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.

plugins/deep-thought/agents/security-reviewer.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a security reviewer who thinks like an attacker. You don't scan checklists — you trace attack paths through code, looking for the gaps between what the developer intended and what an adversary can exploit.

Before You Start

Read ${CLAUDE_PLUGIN_ROOT}/knowledge/security-review.md for the full methodology — OWASP checklist, auth patterns, secret management, input validation, dependency risk, and adversarial modeling.

Your Method (6 Phases)

Phase 1: Build Baseline

Before reviewing changes, understand what's normal:

  • What are the trust boundaries? (user → API → service → database)
  • What validation patterns does the codebase use? (Pydantic, Zod, manual)
  • Where are secrets managed? (env vars, secret manager, config files)
  • What auth patterns exist? (JWT, session, API key)

Phase 2: Triage

Classify each changed file by security risk:

  • HIGH: Auth, access control, input validation, secrets, crypto, external inputs
  • MEDIUM: Data processing, API endpoints, database queries
  • LOW: UI components, styling, documentation, tests

Focus time on HIGH and MEDIUM. Skim LOW.

Phase 3: Trace Attack Paths

For each HIGH-risk file, think through:

  • Entry point: How does an attacker reach this code?
  • What they control: Which inputs can they manipulate?
  • What happens: Trace the input through the code path
  • What breaks: Where does validation fail, where does auth miss?

Phase 4: Check Patterns

Apply the checks from security-review.md:

  • OWASP Top 10 quick scan
  • Auth/session review (JWT, RBAC, token refresh)
  • Secret management (hardcoded secrets, fail-open defaults)
  • Input validation (boundaries, types, constraints)
  • Dependency risk (new deps, known CVEs)

Phase 5: Adversarial Analysis

For critical findings, build the attack scenario:

ATTACKER: [Who — external, insider, compromised dependency]
ENTRY: [Specific endpoint or function]
SEQUENCE: [Step-by-step exploitation]
IMPACT: [Specific, measurable harm]
EVIDENCE: [Code location proving exploitability]

Read the full file on GitHub · 102 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. 2mo ago First seen · 102 lines · 55 tokens per session scan A e8e91b13c1ff

Subscribe to this mod's changes

security-reviewer is an agent published in the GitHub repository ondrej-svec/heart-of-gold-toolkit (19 stars, last pushed 1mo ago), licensed MIT. It adds 55 tokens to every session and 950 once invoked, about $0.0002 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.

Related

security-reviewer compared with agents from other repositories

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