What is security-owasp-web?

A read-only security review guide for web applications, APIs, and mobile backends using the OWASP Top 10, a commonly used list of major web application security risks. It records evidence and assigns a status to each relevant risk category.

Use it to review code, configuration, dependencies, access controls, authentication flows, and monitoring, then document the affected files, exploit path, remediation owner, and verification test.

It helps identify security weaknesses in authentication, permissions, data handling, dependencies, integrations, encryption, logging, and error handling before release or after significant changes.

security-owasp-web — Skill for Codex by ashermahonin/agentic-skills

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 ashermahonin/agentic-skills --skill security-owasp-web

Clone the repo

git clone --depth 1 https://github.com/ashermahonin/agentic-skills

Made for: 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ashermahonin/agentic-skills/security-owasp-web/github.svg)](https://agentmods.dev/skills/ashermahonin/agentic-skills/security-owasp-web)

Your own site

<a href="https://agentmods.dev/skills/ashermahonin/agentic-skills/security-owasp-web"><img src="https://agentmods.dev/badge/skills/ashermahonin/agentic-skills/security-owasp-web/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/ashermahonin/agentic-skills/security-owasp-web"><img src="https://agentmods.dev/badge/skills/ashermahonin/agentic-skills/security-owasp-web.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 706 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.

Model	Per session	Once invoked
Fable 5.1	$0.00071	$0.00706
Opus 5.5	$0.00028	$0.00282
Sonnet 5.5	$0.00014	$0.00141
Haiku 4.5	$0.00007	$0.00071

Measured 2mo ago against content hash 5bac2781a2bd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

security-owasp-web 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 2mo 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.

agentic/skills/security-owasp-web/SKILL.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Security: OWASP Web Top 10

Purpose

Review a web, API, or mobile-backend surface against the current OWASP categories. Give each applicable category a status backed by code, configuration, or test evidence, then assign remediation and residual risk.

Scope and evidence

Read references/owasp-web-top10.md.
Pull the platform matrix from platform-detector and the architecture views from architecture-review.
Pull dependency manifests, CI configs, IAM/RBAC definitions, auth flows, and observability surfaces. Read-only.
Use Context7 MCP to confirm current OWASP wording and any framework's current security guidance (Spring, Django, FastAPI, Express, Rails, Next.js, Phoenix, etc.).

Assessment

For each Top 10 category, collect evidence: route to the relevant files/configs without writing.
Mark per-category status: Pass, Concern, Fail, Out-of-scope.
For Concern/Fail, name: file/config path, what is wrong, blast radius, exploit path sketch, mitigation, owner, and verification test.
Cross-check with security-secrets, cve-zero-day-scanner, and infrastructure-as-code for shared concerns (secrets, dependencies, IAM).
Produce a remediation plan ordered by exploit risk × ease of fix.
Hand off to service-implementation for fixes and qa-eval for security test cases.

Safety rules

Use Context7 MCP for the current OWASP categories, definitions, and framework-specific guidance. Treat references/owasp-web-top10.md as a local checklist, not the authority of record.
Keep a decision trace: source documents, framework version, what was checked, what was not checked, and why.
Refuse to "approve" a category without a named artifact and verification test.
Escalate before authorizing a release with any unmitigated High finding.

Security record

Per-category status table (Pass/Concern/Fail/Out-of-scope) with evidence paths
Findings register: severity, exploit sketch, mitigation, owner, verification test
Remediation plan ordered by risk × ease
Cross-links to security-secrets, cve-zero-day-scanner, infrastructure-as-code
Release gate verdict: Go / Conditional / Hold

Read the full file on GitHub · 57 lines

Files

What ships with it

2 files 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.

2mo ago First seen · 57 lines · 71 tokens per session scan A 5bac2781a2bd

Subscribe to this mod's changes

security-owasp-web is a skill published in the GitHub repository ashermahonin/agentic-skills (10 stars, last pushed 2mo ago), licensed MIT. It adds 71 tokens to every session and 706 once invoked, about $0.0003 per session on Opus 5.5. 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.