api-authentication SKILL.md skillA
api-authentication 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-authentication@git:20260402.75421faPins git:20260402.75421fa 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-authentication/skills/api-authentication/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260402.75421fa, committed Apr 2, 2026
- First version recorded
- Dec 24, 2025
- Size
- 2,664 bytes
- Repository stars
- 243
- License
- MIT
Secure API authentication with JWT, OAuth 2.0, API keys. Use for authentication systems, third-party integrations, service-to-service communication, or encountering token management, security headers, auth flow errors.
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 Authentication
Implement secure authentication mechanisms for APIs using modern standards and best practices.
## Authentication Methods
| Method | Use Case | Security Level |
|--------|----------|----------------|
| JWT | Stateless auth, SPAs | High |
| OAuth 2.0 | Third-party integration | High |
| API Keys | Service-to-service | Medium |
| Session | Traditional web apps | High |
## JWT Implementation (Node.js)
```javascript
const jwt = require('jsonwebtoken');
const generateTokens = (user) => ({
accessToken: jwt.sign(
{ userId: user.id, role: user.role },
process.env.JWT_SECRET,
{ expiresIn: '15m' }
),
refreshToken: jwt.sign(
{ userId: user.id, type: 'refresh' },
process.env.REFRESH_SECRET,
{ expiresIn: '7d' }
)
});
const authMiddleware = (req, res, next) => {
const authHeader = req.headers.authorization;
// Validate authorization header format
if (!authHeader || !authHeader.startsWith('Bearer ')) {
return res.status(401).json({ error: 'Malformed authorization header' });
}
const parts = authHeader.split(' ');
if (parts.length !== 2) {
return res.status(401).json({ error: 'Malformed authorization header' });
}
…Read the whole file at its exact version.
How to install
mdr add secondsky/claude-skills/api-authentication@sha256:449ecd60931a6a1eThe line at the top of this page pins the label git:20260402.75421fa, 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_lf2aaoakfrhzxg3h)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Dec 24, 2025 and Apr 2, 2026, about one every 100 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260402.75421fa latest | 2026-04-02 | 75421fa | 2,664 B | A | view · diff |
| git:20251224.ba827ce | 2025-12-24 | ba827ce | 2,651 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 (2664 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 · 243 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lf2aaoakfrhzxg3h GET https://markdownregistry.com/api/v1/resolve?ref=secondsky/claude-skills/api-authentication GET https://markdownregistry.com/api/v1/blob/449ecd60931a6a1e6d96815f6865b7e33a6d5acf955c82b8978bb0e38845caec
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.