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better-auth SKILL.md skillA

better-auth from giuseppe-trisciuoglio/developer-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add giuseppe-trisciuoglio/developer-kit/better-auth@git:20260324.a02e282

Pins git:20260324.a02e282 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: giuseppe-trisciuoglio/developer-kit
Path: plugins/developer-kit-typescript/skills/better-auth/SKILL.md
Versions recorded: 5
Latest version: git:20260324.a02e282, committed Mar 24, 2026
First version recorded: Feb 20, 2026
Size: 9,519 bytes
Repository stars: 367
License: MIT

Provides Better Auth integration patterns for NestJS backend and Next.js frontend with Drizzle ORM and PostgreSQL. Use when setting up Better Auth with NestJS backend, integrating Next.js App Router frontend, configuring Drizzle ORM schema, implementing social login (GitHub, Google), adding plugins (2FA, Organization, SSO, Magic Link, Passkey), implementing email/password authentication with session management, or creating protected routes and middleware.

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 Integration Guide

## Overview

Better Auth is a type-safe authentication framework for TypeScript supporting multiple providers, 2FA, SSO, organizations, and passkeys. This skill covers integration patterns for NestJS backend with Drizzle ORM + PostgreSQL and Next.js App Router frontend.

## When to Use

- Setting up Better Auth with NestJS backend
- Integrating Next.js App Router frontend
- Configuring Drizzle ORM schema with PostgreSQL
- Implementing social login (GitHub, Google, Facebook, Microsoft)
- Adding MFA/2FA with TOTP, passkey passwordless auth, or magic links
- Managing trusted devices and backup codes for account recovery
- Building multi-tenant apps with organizations or SSO
- Creating protected routes with session management

## Quick Start

### Installation

```bash
# Backend (NestJS)
npm install better-auth @auth/drizzle-adapter drizzle-orm pg
npm install -D drizzle-kit

# Frontend (Next.js)
npm install better-auth
```

### 4-Phase Setup

1. **Database**: Install Drizzle, configure schema, run migrations
2. **Backend**: Create Better Auth instance with NestJS module
3. **Frontend**: Configure auth client, create pages, add middleware
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add giuseppe-trisciuoglio/developer-kit/better-auth@sha256:42f5ab0057ddc55d

The line at the top of this page pins the label git:20260324.a02e282, 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_j2aqy4nmsjhux7o4.svg)](https://markdownregistry.com/a/art_j2aqy4nmsjhux7o4)

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

Versions

The registry has recorded 5 versions of this file, between Feb 20, 2026 and Mar 24, 2026, about one every 8 days.

version	committed	commit	size	audit
git:20260324.a02e282 latest	2026-03-24	a02e282	9,519 B	A	view · diff
git:20260223.c6d4db1	2026-02-23	c6d4db1	18,176 B	A	view · diff
git:20260220.6aaf3ba	2026-02-20	6aaf3ba	18,284 B	A	view · diff
git:20260220.c15ead0	2026-02-20	c15ead0	18,284 B	A	view · diff
git:20260220.65c7bf2	2026-02-20	65c7bf2	13,773 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 (9519 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

giuseppe-trisciuoglio/developer-kit · 367 stars · license MIT · pushed 2026-09-10 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_j2aqy4nmsjhux7o4
GET https://markdownregistry.com/api/v1/resolve?ref=giuseppe-trisciuoglio/developer-kit/better-auth
GET https://markdownregistry.com/api/v1/blob/42f5ab0057ddc55dd13876ad7c30879536e98d3c0d1c4a58bd18b198f93537a9

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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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