better-auth SKILL.md skillA

better-auth from tamnguyendinh/anvien is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add tamnguyendinh/anvien/better-auth@v2.0.0

Pins v2.0.0 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: tamnguyendinh/anvien
Path: internal/aicontext/skills/better-auth/SKILL.md
Versions recorded: 2
Latest version: v2.0.0, committed Jun 4, 2026
First version recorded: Jun 3, 2026
Size: 6,826 bytes
Repository stars: 12
License: MIT

Use when the user asks to implement Better Auth.

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

# Better Auth Skill

Better Auth is comprehensive, framework-agnostic authentication/authorization framework for TypeScript with built-in email/password, social OAuth, and powerful plugin ecosystem for advanced features.

## When to Use

- Implementing auth in TypeScript/JavaScript applications
- Adding email/password or social OAuth authentication
- Setting up 2FA, passkeys, magic links, advanced auth features
- Building multi-tenant apps with organization support
- Managing sessions and user lifecycle
- Working with any framework (Next.js, Nuxt, SvelteKit, Remix, Astro, Hono, Express, etc.)

## Quick Start

### Installation

```bash
npm install better-auth
# or pnpm/yarn/bun add better-auth
```

### Environment Setup

Create `.env`:
```env
BETTER_AUTH_SECRET=<generated-secret-32-chars-min>
BETTER_AUTH_URL=http://localhost:3000
```

### Basic Server Setup

Create `auth.ts` (root, lib/, utils/, or under src/app/server/):

```ts
import { betterAuth } from "better-auth";

export const auth = betterAuth({
  database: {
    // See references/database-integration.md
  },
  emailAndPassword: {
    enabled: true,
    autoSignIn: true
  },
  socialProviders: {
    github: {
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add tamnguyendinh/anvien/better-auth@sha256:55d40b98293e6d60

The line at the top of this page pins the label v2.0.0, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_vdhrjttnsgefcfmi.svg)](https://markdownregistry.com/a/art_vdhrjttnsgefcfmi)

6 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Jun 3, 2026 and Jun 4, 2026, about one every day.

version	committed	commit	size	audit
v2.0.0 latest	2026-06-04	bd0c625	6,826 B	A	view · diff
v2.0.0	2026-06-03	57935e2	7,385 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (6826 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

GitHub

tamnguyendinh/anvien · 12 stars · license MIT · pushed 2026-11-02 · branch master

API

GET https://markdownregistry.com/api/v1/artifacts/art_vdhrjttnsgefcfmi
GET https://markdownregistry.com/api/v1/resolve?ref=tamnguyendinh/anvien/better-auth
GET https://markdownregistry.com/api/v1/blob/55d40b98293e6d60d0acdd86235840349ab8b2b5af8110564a1fb8acdaa7eadd

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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