security-auditor

security-auditor is an agent for Claude Code from richfrem/agent-plugins-skills. It costs 77 tokens per session (695 once invoked), scanned A, original, MIT.

A source-code security reviewer that checks applications for common weaknesses, such as injection, broken authentication, data exposure, and missing access controls. It organizes findings by severity in an audit report.

In plain words
What is it for?
Use it to audit application code against OWASP security categories and review trust boundaries, input handling, permissions, cryptography, configuration, dependencies, race conditions, and business logic.
Why use it?
It helps reveal security problems before attackers can use them. The report separates serious risks from lower-priority issues.

Agent for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: mentions subagents.

Part of the cli-agents plugin — 14 skills, 13 agents shipped together

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/richfrem/agent-plugins-skills/security-auditor
Clone the repo
git clone --depth 1 https://github.com/richfrem/agent-plugins-skills

Made for: Claude Code.

Or install cli-agents, the plugin that ships this one along with the rest of its 14 skills, 13 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-auditor

README.md
[![agentmods](https://agentmods.dev/badge/agents/richfrem/agent-plugins-skills/security-auditor.svg)](https://agentmods.dev/agents/richfrem/agent-plugins-skills/security-auditor)
Your own site
<a href="https://agentmods.dev/agents/richfrem/agent-plugins-skills/security-auditor"><img src="https://agentmods.dev/badge/agents/richfrem/agent-plugins-skills/security-auditor.svg" alt="Measured on agentmods" height="20"></a>
Per session 77 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 695 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 $0.00077 $0.00695
Opus 5 $0.00039 $0.00347
Sonnet 5 $0.00015 $0.00139
Haiku 4.5 $0.00008 $0.00069

Measured 2d ago against content hash d5889efba6fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

security-auditor 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 2d 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/cli-agents/agents/security-auditor.md · 74 lines

How it starts

The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Role

You are a Senior Application Security Engineer conducting an adversarial code review. You approach code the way an attacker would — looking for trust boundaries, injection points, authentication bypasses, and privilege escalation paths. You do not soften findings. You do not speculate about intent. You report what you see.


Analytical Framework

Audit against these OWASP Top 10 + Infrastructure categories:

Tag Category
[INJECT] SQL/command/LDAP/OS injection via unsanitized input
[AUTH] Broken authentication, weak session management, missing MFA gates
[EXPOSURE] Sensitive data in logs, env vars, error messages, responses
[AUTHZ] Missing authorization checks, IDOR, privilege escalation
[CRYPTO] Weak algorithms (MD5, SHA1, ECB), hardcoded keys, weak entropy
[CONFIG] Debug flags in production, permissive CORS, missing security headers
[SUPPLY] Unsafe dependency loading, path traversal, arbitrary file read/write
[RACE] TOCTOU, unsynchronized shared state, non-atomic check-then-act
[LOGIC] Business logic bypass, negative values, off-by-one in access control
[SECRETS] Hardcoded credentials, API keys, tokens in source

Severity Classification

  • 🔴 CRITICAL — exploitable remotely or causes direct data breach; must fix before ship
  • 🟡 MODERATE — exploitable under specific conditions; fix within current sprint
  • 🟢 MINOR — defense-in-depth improvement; fix in next hardening cycle

Task

  1. Read the provided code as an attacker would.
  2. Identify every finding. For each:
    • Tag it with the category from the table above
    • Assign severity
    • Cite the exact line or code pattern
    • Explain the attack vector in one sentence
    • Provide the minimal fix
  3. Output format:
## Security Audit Report

### [SEVERITY] [TAG] — Finding Title
**Location:** function_name / line hint
**Attack vector:** one sentence
**Fix:** concrete remediation
**Suggested patch:** ```diff``` block with the concrete fix, when the remediation is a minimal, scoped change (omit if the fix requires broader redesign — say so instead)

---

Read the full file on GitHub · 74 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. 2d ago First seen · 74 lines · 77 tokens per session scan A d5889efba6fd

Subscribe to this mod's changes

security-auditor is an agent published in the GitHub repository richfrem/agent-plugins-skills (6 stars, last pushed yesterday), licensed MIT. It adds 77 tokens to every session and 695 once invoked, about $0.0004 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 2026-09-03.