owasp-check

owasp-check is a skill for Claude Code, Codex from woohyun212/security-skill. It costs 20 tokens per session (1,039 once invoked), scanned A, original, MIT.

A checklist for checking an application against the OWASP Top 10 2021, a widely used list of ten common web-application security risk areas. It produces a pass, fail, or not-applicable result for each area.

In plain words
What is it for?
Use it for a web, API, or mobile application before release, during an internal security review, or while preparing for an audit or penetration test.
Why use it?
It turns a broad security review into a consistent set of checks. It also highlights which failed areas should be fixed first and links them to OWASP guidance.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it for a web, API, or mobile application before release, during an internal security review, or while preparing for an audit or penetration test.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/woohyun212/security-skill/owasp-check
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.

Any agent
npx skills add woohyun212/security-skill --skill owasp-check
Clone the repo
git clone --depth 1 https://github.com/woohyun212/security-skill

Made for: Claude Code, Codex.

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 owasp-check

README.md
[![agentmods](https://agentmods.dev/badge/skills/woohyun212/security-skill/owasp-check/github.svg)](https://agentmods.dev/skills/woohyun212/security-skill/owasp-check)
Your own site
<a href="https://agentmods.dev/skills/woohyun212/security-skill/owasp-check"><img src="https://agentmods.dev/badge/skills/woohyun212/security-skill/owasp-check/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 owasp-check

Your own site · 80×15
<a href="https://agentmods.dev/skills/woohyun212/security-skill/owasp-check"><img src="https://agentmods.dev/badge/skills/woohyun212/security-skill/owasp-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,039 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 $0.00020 $0.01039
Opus 5 $0.00010 $0.00519
Sonnet 5 $0.00004 $0.00208
Haiku 4.5 $0.00002 $0.00104

Measured 9d ago against content hash ffd759c11c4c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

owasp-check 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.

owasp-check/SKILL.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

What this skill does

Inspects security controls of a target application against the OWASP Top 10 2021 standard. Queries the defense status for each of the 10 categories (A01–A10) and generates a Pass/Fail/N-A compliance matrix. Provides prioritized remediation recommendations with official OWASP reference links for each failed item.

When to use

  • When conducting an application security review or pre-release inspection
  • When performing an OWASP-based self-assessment in preparation for a security audit
  • When systematically communicating security requirements to a development team
  • When identifying risk priorities before a penetration test

Prerequisites

  • No external tools required (checklist-based)
  • Inspector's knowledge of the target application's technology stack

Inputs

Item Description Example
APP_NAME Name of the application under review MyWebApp v2.3
APP_TYPE Application type web / api / mobile
TECH_STACK Technology stack in use (optional) Node.js, PostgreSQL, React

Workflow

Step 1: Collect target application information

APP_NAME="${SECSKILL_APP_NAME:-}"
if [ -z "$APP_NAME" ]; then
  read -rp "Application name: " APP_NAME
fi
APP_TYPE="${SECSKILL_APP_TYPE:-}"
if [ -z "$APP_TYPE" ]; then
  read -rp "Type (web/api/mobile): " APP_TYPE
fi
TECH_STACK="${SECSKILL_TECH_STACK:-}"
if [ -z "$TECH_STACK" ]; then
  read -rp "Tech stack (e.g. Node.js, PostgreSQL): " TECH_STACK
fi

REPORT_FILE="/tmp/owasp_check_$(date +%Y%m%d_%H%M%S).md"
echo "# OWASP Top 10 2021 Inspection Results" > "$REPORT_FILE"
echo "" >> "$REPORT_FILE"
echo "- **Target**: $APP_NAME" >> "$REPORT_FILE"
echo "- **Type**: $APP_TYPE" >> "$REPORT_FILE"
echo "- **Stack**: $TECH_STACK" >> "$REPORT_FILE"
echo "- **Date**: $(date '+%Y-%m-%d')" >> "$REPORT_FILE"
echo "" >> "$REPORT_FILE"
echo "[+] Report file initialized: $REPORT_FILE"

Step 2: Query each OWASP Top 10 2021 category

Reference: See REFERENCE.md for the full OWASP Top 10 2021 checklist (10 categories, 35 questions, reference URLs, and remediation priority guide).

Read the full file on GitHub · 112 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 112 lines · 20 tokens per session scan A ffd759c11c4c

Subscribe to this mod's changes

owasp-check is a skill published in the GitHub repository woohyun212/security-skill (21 stars, last pushed 4mo ago), licensed MIT. It adds 20 tokens to every session and 1,039 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 2026-08-30.

Related

Other skills, from other repositories

systematic-debugging

Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.

obra/superpowers · 21 tokens

local-ai-agents

Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…

microsoft/ai-agents-for-beginners · 200 tokens

next-cache-components-adoption

Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…

vercel/next.js · 95 tokens

insight-error-page

Write or audit an insight-kind error page for the Next.js dev overlay. Use when creating a new errors/ .mdx page, auditing an existing one, or checking that a page matches the framework fix cards. Covers page structure, title alignment, FixCard cards with Copy prompt button, code snippets, terminology verification…

vercel/next.js · 83 tokens

next-cache-components-optimizer

Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then…

vercel/next.js · 170 tokens

next-partial-prefetching-adoption

Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the partialPrefetching flag, opt routes in with export const prefetch = 'partial', audit Link prefetch={true} behavior, preserve existing prefetched UI with…

vercel/next.js · 103 tokens