csrf-protection SKILL.md skillA
csrf-protection 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/csrf-protection@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/csrf-protection/skills/csrf-protection/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260719.059fc9f, committed Jul 19, 2026
- First version recorded
- Dec 24, 2025
- Size
- 2,621 bytes
- Repository stars
- 247
- License
- MIT
Implements CSRF protection using synchronizer tokens, double-submit cookies, and SameSite attributes. Use when securing web forms, protecting state-changing endpoints, or implementing defense-in-depth authentication.
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
# CSRF Protection
Defend against Cross-Site Request Forgery attacks using multiple protection layers.
## Protection Methods
| Method | How It Works | Browser Support |
|--------|--------------|-----------------|
| Synchronizer Token | Hidden form field validated server-side | All |
| Double Submit | Cookie + header must match | All |
| SameSite Cookie | Browser blocks cross-origin requests | Modern |
## Token-Based Protection (Express)
```javascript
const crypto = require('crypto');
function generateToken() {
return crypto.randomBytes(32).toString('hex');
}
// Middleware
app.use((req, res, next) => {
if (!req.session.csrfToken) {
req.session.csrfToken = generateToken();
}
res.locals.csrfToken = req.session.csrfToken;
next();
});
// Validation
app.post('*', (req, res, next) => {
const token = req.body._csrf || req.headers['x-csrf-token'];
// crypto.timingSafeEqual throws RangeError when buffers differ in length,
// so check length explicitly first (still constant-time on the equal-length path).
const csrf = req.session.csrfToken || '';
if (!token || token.length !== csrf.length) {
return res.status(403).json({ error: 'Invalid CSRF token' });
}
…Read the whole file at its exact version.
How to install
mdr add secondsky/claude-skills/csrf-protection@sha256:24c0c47f86be9781The 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_ffd4ug6bzxi64mov)
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 | 2,621 B | A | view · diff |
| git:20260402.75421fa | 2026-04-02 | 75421fa | 2,335 B | A | view · diff |
| git:20251224.ba827ce | 2025-12-24 | ba827ce | 2,322 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 (2621 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_ffd4ug6bzxi64mov GET https://markdownregistry.com/api/v1/resolve?ref=secondsky/claude-skills/csrf-protection GET https://markdownregistry.com/api/v1/blob/24c0c47f86be9781314dee5374d02892ed4877cb8e7f4c5839314b6ae56a5bbd
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.