Auth Security Patterns SKILL.md skillA
Auth Security Patterns from smicolon/ai-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add smicolon/ai-kit/Auth Security Patterns@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- smicolon/ai-kit
- Path
packs/better-auth/skills/auth-security/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Feb 15, 2026
- Size
- 9,898 bytes
- Repository stars
- 7
- License
- MIT
Auto-enforce authentication security best practices. Activates when implementing password policies, rate limiting, session security, CSRF protection, or security headers in auth flows.
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
# Auth Security Patterns
This skill enforces authentication security best practices for Better Auth implementations.
## Password Security
### Strong Password Policy
```typescript
import { betterAuth } from 'better-auth'
export const auth = betterAuth({
emailAndPassword: {
enabled: true,
password: {
minLength: 12,
maxLength: 128,
requireLowercase: true,
requireUppercase: true,
requireNumber: true,
requireSpecialChar: true,
// Custom validation
validate: (password) => {
// Check against common passwords
if (commonPasswords.includes(password.toLowerCase())) {
return 'Password is too common'
}
// Check for repeated characters
if (/(.)\1{2,}/.test(password)) {
return 'Password cannot have 3+ repeated characters'
}
return true
},
},
},
})
```
### Password Hashing
```typescript
// Better Auth uses bcrypt by default with cost factor 10
// For higher security requirements:
export const auth = betterAuth({
advanced: {
password: {
hash: async (password) => {
const salt = await bcrypt.genSalt(12) // Higher cost
…Read the whole file at its exact version.
How to install
mdr add smicolon/ai-kit/Auth Security Patterns@sha256:01a8de40468ca2abThe line at the top of this page pins the label v1.0.0, 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_y2axjkjknv3ef64u)
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Versions
The registry has recorded 1 version of this file, committed on Feb 15, 2026.
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 (9898 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
smicolon/ai-kit · 7 stars · license MIT · pushed 2026-09-15 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_y2axjkjknv3ef64u GET https://markdownregistry.com/api/v1/resolve?ref=smicolon/ai-kit/Auth Security Patterns GET https://markdownregistry.com/api/v1/blob/01a8de40468ca2ab823bcf5ed9ce3df04fd89109b6193228254b8ef57044d79b
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.
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