api-security-hardening SKILL.md skillA
api-security-hardening from secondsky/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add secondsky/claude-skills/api-security-hardening@git:20260719.059fc9fPins git:20260719.059fc9f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- secondsky/claude-skills
- Path
plugins/api-security-hardening/skills/api-security-hardening/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260719.059fc9f, committed Jul 19, 2026
- First version recorded
- Dec 24, 2025
- Size
- 2,871 bytes
- Repository stars
- 247
- License
- MIT
REST API security hardening with authentication, rate limiting, input validation, security headers. Use for production APIs, security audits, defense-in-depth, or encountering vulnerabilities, injection attacks, CORS issues.
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 Hardening
Protect REST APIs against common vulnerabilities with multiple security layers.
## Security Middleware Stack (Express)
```javascript
const helmet = require('helmet');
const rateLimit = require('express-rate-limit');
const mongoSanitize = require('express-mongo-sanitize');
app.use(helmet());
app.use(mongoSanitize());
// For input sanitization, see the `xss-prevention` skill — do NOT use the
// deprecated `xss-clean` package (unmaintained since 2018; its own README
// recommends migrating off it).
app.use('/api/', rateLimit({
windowMs: 15 * 60 * 1000,
max: 100
}));
app.use('/api/auth/', rateLimit({
windowMs: 15 * 60 * 1000,
max: 5
}));
```
## Input Validation
```javascript
const { body, validationResult } = require('express-validator');
const escapeHtml = require('escape-html');
app.post('/users',
body('email').isEmail().normalizeEmail(),
body('password').isLength({ min: 8 }).matches(/[A-Z]/).matches(/[0-9]/),
// express-validator v7+ removed the built-in .escape() sanitizer; use a
// customSanitizer backed by `escape-html` to HTML-escape the value.
body('name').trim().isLength({ max: 100 }).customSanitizer(v => escapeHtml(v)),
…Read the whole file at its exact version.
How to install
mdr add secondsky/claude-skills/api-security-hardening@sha256:40f6f063e321ffc4The line at the top of this page pins the label git:20260719.059fc9f, 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_g5vfblwtdyg6ncpn)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Dec 24, 2025 and Jul 19, 2026, about one every 104 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260719.059fc9f latest | 2026-07-19 | 059fc9f | 2,871 B | A | view · diff |
| git:20260402.75421fa | 2026-04-02 | 75421fa | 2,520 B | A | view · diff |
| git:20251224.ba827ce | 2025-12-24 | ba827ce | 2,507 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 (2871 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
secondsky/claude-skills · 247 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_g5vfblwtdyg6ncpn GET https://markdownregistry.com/api/v1/resolve?ref=secondsky/claude-skills/api-security-hardening GET https://markdownregistry.com/api/v1/blob/40f6f063e321ffc453b41bc9c7f8b159425b063943b25396e2fd297ba14845a4
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.