api-security SKILL.md skillA
api-security from leahycc/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add leahycc/claude-skills/api-security@git:20261102.e28ea25Pins git:20261102.e28ea25 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- leahycc/claude-skills
- Path
skills/api-security/SKILL.md- Versions recorded
- 7
- Latest version
- git:20261102.e28ea25, committed Nov 2, 2026
- First version recorded
- Mar 29, 2026
- Size
- 14,317 bytes
- Repository stars
- 3
- License
- MIT
OWASP API Security Top 10 (2023) with production Next.js App Router code. Access control, authentication with MFA and password reset, input validation (SQL, NoSQL and command injection), rate limiting and per-account login throttling, security headers and CSRF, data exposure, supply chain and startup env checks, SSRF with DNS pinning, file uploads, and AI tools on those APIs. Use when writing or reviewing Route Handlers, Server Actions, proxy.ts, auth flows, uploads, outbound fetches, or…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# API Security — OWASP API Security Top 10 (2023) for Next.js Production-grade API security patterns for Next.js App Router. Covers every category in the OWASP API Security Top 10 (2023) with cross-references to the OWASP Web Top 10 (2025). AI tools attached to those APIs are in [AI Tools](resources/ai-tools.md). Verified against the official OWASP specifications. Scope: for CSRF and XSS this skill covers the server half. That is request origin checks, cookie flags, headers, and the sinks where user data reaches HTML. Client-side DOM code and browser state are out of scope. ## Contents - [Architecture](#architecture) - [Quick Reference](#quick-reference) - [Decision Matrix: "Where Do I Add Security?"](#decision-matrix-where-do-i-add-security) - [The #1 Mistake: Server Actions Are Public Endpoints](#the-1-mistake-server-actions-are-public-endpoints) - [Decision Matrix: "Is This Secure?"](#decision-matrix-is-this-secure) - [OWASP API Security Top 10 (2023): Full Mapping](#owasp-api-security-top-10-2023-full-mapping) - [OWASP Web Top 10 (2025): Cross-Reference](#owasp-web-top-10-2025-cross-reference) - [AI tools: where they map](#ai-tools-where-they-map) …
Read the whole file at its exact version.
How to install
mdr add leahycc/claude-skills/api-security@sha256:3364a35ace37db42The line at the top of this page pins the label git:20261102.e28ea25, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_x7qepnlwncxv7bau)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 7 versions of this file, between Mar 29, 2026 and Nov 2, 2026, about one every 36 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261102.e28ea25 latest | 2026-11-02 | e28ea25 | 14,317 B | A | view · diff |
| git:20261024.77a47ac | 2026-10-24 | 77a47ac | 10,770 B | A | view · diff |
| git:20261023.9210c32 | 2026-10-23 | 9210c32 | 10,632 B | A | view · diff |
| git:20261023.9ecc8c1 | 2026-10-23 | 9ecc8c1 | 8,599 B | A | view · diff |
| git:20261022.7cb2297 | 2026-10-22 | 7cb2297 | 9,253 B | A | view · diff |
| git:20261021.1093157 | 2026-10-21 | 1093157 | 9,069 B | A | view · diff |
| git:20260329.27c73f3 | 2026-03-29 | 27c73f3 | 8,986 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14317 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
leahycc/claude-skills · 3 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_x7qepnlwncxv7bau GET https://markdownregistry.com/api/v1/resolve?ref=leahycc/claude-skills/api-security GET https://markdownregistry.com/api/v1/blob/3364a35ace37db42347d18812f2f8c9684e45cb0721ebb227028aa04573d47a6
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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