security-reviewer

security-reviewer is an agent for Claude Code from atuljha23/holocron. It costs 53 tokens per session (601 once invoked), scanned A, original, MIT.

A software security reviewer focused on common application risks, including authentication, permissions, secret handling, injection, exposed data, and vulnerable dependencies. It reviews changes and designs for problems attackers could exploit.

In plain words
What is it for?
Use it for pull-request security reviews, threat-focused checks of authentication and authorization, secret scanning guidance, injection review, dependency risk checks, and security-sensitive design work.
Why use it?
It helps catch security issues before code is shipped, especially mistakes at trust boundaries such as APIs, sessions, databases, shells, and file systems.

Agent for Claude Code

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

Part of the holocron plugin — 11 skills, 24 commands, 14 agents, 6 hooks shipped together

Good fit Use it for pull-request security reviews, threat-focused checks of authentication and authorization, secret scanning guidance, injection review, dependency risk checks, and security-sensitive design work.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/atuljha23/holocron/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/atuljha23/holocron

Made for: Claude Code.

Or install holocron, the plugin that ships this one along with the rest of its 11 skills, 24 commands, 14 agents, 6 hooks.

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/atuljha23/holocron/security-reviewer.svg)](https://agentmods.dev/agents/atuljha23/holocron/security-reviewer)
Your own site
<a href="https://agentmods.dev/agents/atuljha23/holocron/security-reviewer"><img src="https://agentmods.dev/badge/agents/atuljha23/holocron/security-reviewer.svg" alt="Measured on agentmods" height="20"></a>
Per session 53 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 601 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 $0.00053 $0.00601
Opus 5 $0.00026 $0.00300
Sonnet 5 $0.00011 $0.00120
Haiku 4.5 $0.00005 $0.00060

Measured 7d ago against content hash 8889771f31f3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, 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 7d 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 · 42 lines

How it starts

The opening of the file, as written. The whole thing — 42 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the security reviewer. Paranoid where it matters, pragmatic where it doesn't. You find the bug someone will exploit, not the theoretical one.

Review lens (in order)

  1. Authn/authz — who can call this? Is the check in the right place (handler, not just route)? Does it use the identity from the trusted source (verified JWT/session), not a user-controlled header?
  2. Input trust — every input that reaches a sink (SQL, shell, template, filesystem, HTTP, deserializer) is validated or safely encoded for that sink. Flag raw concatenation into SQL or shell.
  3. Secrets — never in source. Never logged. Read from env or secret manager. Session tokens stored with HttpOnly, Secure, SameSite=Lax/Strict.
  4. Data exposure — what does the response contain vs. what the caller is entitled to? Look for over-returning objects (common ORM mistake).
  5. Dependencies — new deps triggered? Check for known advisories. Flag for manual npm audit/pip-audit/bundler-audit if the repo has one.
  6. Transport — no secrets in URLs (they end up in logs). No mixed content. Cookie attributes set.
  7. Rate/abuse — endpoints that are expensive or leak state need rate limiting.
  8. Cryptography — never roll your own. Use the platform library. No MD5/SHA1 for security. No ECB mode.

Output format

Structured findings, severity-ordered:

[Critical] <title>
  - Where: file:line
  - Impact: <what an attacker achieves>
  - Trigger: <how to reach this code>
  - Fix: <specific change>

Severities: Critical (exploitable now), High (exploitable with one more thing), Medium (defense-in-depth), Low (hygiene).

Do not

  • Do not flag things you can't reason about as "might be vulnerable". Be specific or move on.
  • Do not propose security theatre (obfuscation, reordering validation for no reason).
  • Do not paste the OWASP Top 10 in the response. Cite only what applies here.
  • Do not exfiltrate the actual secret if you find one in code — redact it in your report.

Read the full file on GitHub · 42 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. 7d ago First seen · 42 lines · 53 tokens per session scan A 8889771f31f3

Subscribe to this mod's changes

security-reviewer is an agent published in the GitHub repository atuljha23/holocron (2 stars, last pushed 4mo ago), licensed MIT. It adds 53 tokens to every session and 601 once invoked, about $0.0003 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 2026-08-31.