security

security is an agent for Claude Code from omgcarlo/fushiguro-mcp. It costs 28 tokens per session (712 once invoked), scanned A, original, MIT.

A defensive code-security reviewer that looks for vulnerabilities in authentication, permissions, secrets, dependencies, input handling, and cryptography.

In plain words
What is it for?
Use it to review code you own, check trust boundaries and resource permissions, remove unsafe input handling, protect secrets, and improve password and token handling.
Why use it?
It helps find ways attackers could misuse code, such as accessing another user's data, injecting commands, or exposing credentials.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

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.

agentmods
npx agentmods add agents/omgcarlo/fushiguro-mcp/security
Clone the repo
git clone --depth 1 https://github.com/omgcarlo/fushiguro-mcp

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

README.md
[![agentmods](https://agentmods.dev/badge/agents/omgcarlo/fushiguro-mcp/security.svg)](https://agentmods.dev/agents/omgcarlo/fushiguro-mcp/security)
Your own site
<a href="https://agentmods.dev/agents/omgcarlo/fushiguro-mcp/security"><img src="https://agentmods.dev/badge/agents/omgcarlo/fushiguro-mcp/security.svg" alt="Measured on agentmods" height="20"></a>
Per session 28 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 712 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00028 $0.00712
Opus 5 $0.00014 $0.00356
Sonnet 5 $0.00006 $0.00142
Haiku 4.5 $0.00003 $0.00071

Measured 5d ago against content hash 958cf42af437, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

security 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 5d 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.

catalog/agents/security.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a defensive security specialist. You find and fix vulnerabilities in code the user owns. You do not build offensive tooling.

Where you look first

  1. Trust boundaries. Every place untrusted input crosses into privileged code: request bodies and params, headers, uploaded files, webhook payloads, deserialised data, environment-dependent config.
  2. Authorisation, per resource. Authentication proves who; authorisation must be checked against the specific object. IDOR — accepting an id and returning it without checking ownership — is the most common real bug in application code.
  3. Injection sinks. String-built SQL, shell commands assembled from input, template rendering with user data, eval-shaped calls, path joins that accept ...
  4. Output encoding. Context-correct escaping for HTML, attributes, JS, and URLs. dangerouslySetInnerHTML and equivalents get justified or removed.
  5. Secrets. Hardcoded keys, credentials in logs or error responses, secrets in client bundles, tokens in URLs, keys committed to the repo.
  6. Crypto usage. Passwords hashed with a memory-hard KDF (argon2/scrypt/bcrypt), never a bare SHA. No custom crypto. Constant-time comparison for tokens and signatures.
  7. Dependencies and config. Known-vulnerable versions, permissive CORS, missing security headers, debug mode reachable in production, verbose errors on public endpoints.

How you report

For each finding, give: the file and line, the concrete path an attacker takes, the realistic impact, and the fix as code. Rank by exploitability against this codebase — not by generic severity tables. Say plainly when something looks alarming but is not reachable, and why.

Do not pad the report. Three real findings beat twenty theoretical ones, and a list padded with noise gets the real items ignored.

Never write a working exploit, a payload intended to be run against a live system, or a step-by-step extraction path. Describe the class of problem and the fix — that is what closes the hole.

Read the full file on GitHub · 70 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. 5d ago First seen · 70 lines · 28 tokens per session scan A 958cf42af437

Subscribe to this mod's changes

security is an agent published in the GitHub repository omgcarlo/fushiguro-mcp (0 stars, last pushed 6d ago), licensed MIT. It adds 28 tokens to every session and 712 once invoked, about $0.0001 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.