owasp-api-top10

owasp-api-top10 is a skill for Claude Code from jassics/awesome-claude-security. It costs 50 tokens per session (378 once invoked), scanned A, original, GPL-3.0.

A security review for REST and GraphQL APIs, which are interfaces that let software exchange data. It checks them against the 2023 OWASP API Security Top 10, a list of common API security risks.

In plain words
What is it for?
Use it for authorized API reviews or penetration tests and to produce findings with severity levels and remediation guidance.
Why use it?
It helps find and rank security problems in an API before attackers do, while also describing how to fix them.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the api-security plugin — 2 skills shipped together

Good fit Use it for authorized API reviews or penetration tests and to produce findings with severity levels and remediation guidance.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jassics/awesome-claude-security/owasp-api-top10
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 jassics/awesome-claude-security --skill owasp-api-top10
Clone the repo
git clone --depth 1 https://github.com/jassics/awesome-claude-security

Made for: Claude Code.

Or install api-security, the plugin that ships this one along with the rest of its 2 skills.

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-api-top10

README.md
[![agentmods](https://agentmods.dev/badge/skills/jassics/awesome-claude-security/owasp-api-top10/github.svg)](https://agentmods.dev/skills/jassics/awesome-claude-security/owasp-api-top10)
Your own site
<a href="https://agentmods.dev/skills/jassics/awesome-claude-security/owasp-api-top10"><img src="https://agentmods.dev/badge/skills/jassics/awesome-claude-security/owasp-api-top10/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-api-top10

Your own site · 80×15
<a href="https://agentmods.dev/skills/jassics/awesome-claude-security/owasp-api-top10"><img src="https://agentmods.dev/badge/skills/jassics/awesome-claude-security/owasp-api-top10.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 378 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 unknown 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 $0.00050 $0.00378
Opus 5 $0.00025 $0.00189
Sonnet 5 $0.00010 $0.00076
Haiku 4.5 $0.00005 $0.00038

Measured 10d ago against content hash 46f5a2477ef1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

owasp-api-top10 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 10d 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/api-security/skills/owasp-api-top10/SKILL.md · 38 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 10d ago First seen · 38 lines · 50 tokens per session scan A 46f5a2477ef1

Subscribe to this mod's changes

owasp-api-top10 is a skill published in the GitHub repository jassics/awesome-claude-security (6 stars, last pushed 1mo ago), licensed GPL-3.0. It adds 50 tokens to every session and 378 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.

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