Better Auth Core

This walks you through the Better Auth setup in TypeScript apps: wiring up the server instance with your database driver or adapter, mounting handlers, creating the client, and working with sessions. You'll configure environment variables, set up social or email/password auth, and call server-side APIs with the right headers. The skill pushes you toward a clean separation between client and server, keeps the data layer pluggable, and includes TypeScript inference helpers. It's practical if you're adding authentication to a full-stack TypeScript project and want the plumbing done correctly without hunting through docs.

skills.sh installs: 368
GitHub stars: 79
last updated: Aug 21, 2026

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Install

$ npx -y skills add bobmatnyc/claude-mpm-skills --skill better-auth-core --agent claude-code

Installs into .claude/skills of the current project.

Files

Better Auth Core (TypeScript)

Goals

Set up a Better Auth instance with environment variables and data layer wiring.
Wire server handlers and a client instance.
Use sessions and server-side API methods safely.
Keep data-layer choices pluggable (drivers or adapters).

Quick start

Install better-auth.
Set BETTER_AUTH_SECRET (32+ chars) and BETTER_AUTH_URL.
Create auth.ts and export auth.
Provide database (driver or adapter) or omit for stateless sessions.
Mount a handler (auth.handler or a framework helper).
Create a client with createAuthClient.

import { betterAuth } from "better-auth";

export const auth = betterAuth({
  database: myDatabaseOrAdapter, // driver or adapter; omit for stateless mode
  emailAndPassword: { enabled: true },
  socialProviders: {
    github: {
      clientId: process.env.GITHUB_CLIENT_ID as string,
      clientSecret: process.env.GITHUB_CLIENT_SECRET as string,
    },
  },
});

SKILL.md on GitHub