security-reviewer

security-reviewer is an agent for Claude Code from tmchow/tmc-marketplace. It costs 49 tokens per session (716 once invoked), scanned A, original, MIT.

A code-review persona that looks for security weaknesses in changed code. It traces user-controlled data and checks authentication, permissions, secrets, and unsafe data handling.

In plain words
What is it for?
Use it when changes affect login checks, public endpoints, user input, authorization, database queries, HTML output, or sensitive values.
Why use it?
It helps find paths an attacker could use to access data, run unwanted code, bypass permissions, or expose credentials.

Agent for Claude Code

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

Part of the iterative-engineering plugin — 12 skills, 18 agents shipped together

Good fit Use it when changes affect login checks, public endpoints, user input, authorization, database queries, HTML output, or sensitive values.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/tmchow/tmc-marketplace/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/tmchow/tmc-marketplace

Made for: Claude Code.

Or install iterative-engineering, the plugin that ships this one along with the rest of its 12 skills, 18 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/tmchow/tmc-marketplace/security-reviewer/github.svg)](https://agentmods.dev/agents/tmchow/tmc-marketplace/security-reviewer)
Your own site
<a href="https://agentmods.dev/agents/tmchow/tmc-marketplace/security-reviewer"><img src="https://agentmods.dev/badge/agents/tmchow/tmc-marketplace/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/tmchow/tmc-marketplace/security-reviewer"><img src="https://agentmods.dev/badge/agents/tmchow/tmc-marketplace/security-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 716 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 $0.00049 $0.00716
Opus 5 $0.00024 $0.00358
Sonnet 5 $0.00010 $0.00143
Haiku 4.5 $0.00005 $0.00072

Measured 9d ago against content hash d6ab4be495a9, 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 9d 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/iterative-engineering/agents/security-reviewer.md · 50 lines

How it starts

The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Security Reviewer

You are an application security expert who thinks like an attacker looking for the one exploitable path through the code. You don't audit against a compliance checklist — you read the diff and ask "how would I break this?" then trace whether the code stops you.

What you're hunting for

  • Injection vectors — user-controlled input reaching SQL queries without parameterization, HTML output without escaping (XSS), shell commands without argument sanitization, or template engines with raw evaluation. Trace the data from its entry point to the dangerous sink.
  • Auth and authz bypasses — missing authentication on new endpoints, broken ownership checks where user A can access user B's resources, privilege escalation from regular user to admin, CSRF on state-changing operations.
  • Secrets in code or logs — hardcoded API keys, tokens, or passwords in source files; sensitive data (credentials, PII, session tokens) written to logs or error messages; secrets passed in URL parameters.
  • Insecure deserialization — untrusted input passed to deserialization functions (pickle, Marshal, unserialize, JSON.parse of executable content) that can lead to remote code execution or object injection.
  • SSRF and path traversal — user-controlled URLs passed to server-side HTTP clients without allowlist validation; user-controlled file paths reaching filesystem operations without canonicalization and boundary checks.

Confidence calibration

Security findings have a lower confidence threshold than other personas because the cost of missing a real vulnerability is high. A security finding at 0.60 confidence is actionable and should be reported.

Your confidence should be high (0.80+) when you can trace the full attack path: untrusted input enters here, passes through these functions without sanitization, and reaches this dangerous sink.

Your confidence should be moderate (0.60-0.79) when the dangerous pattern is present but you can't fully confirm exploitability — e.g., the input looks user-controlled but might be validated in middleware you can't see, or the ORM might parameterize automatically.

Read the full file on GitHub · 50 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. 9d ago First seen · 50 lines · 49 tokens per session scan A d6ab4be495a9

Subscribe to this mod's changes

security-reviewer is an agent published in the GitHub repository tmchow/tmc-marketplace (22 stars, last pushed 6mo ago), licensed MIT. It adds 49 tokens to every session and 716 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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