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explore / Web & frontend / mozg / Better Auth

Better Auth · Concepts

Answer questions about Better Auth's concepts: the database schema, sessions, users and accounts, hooks, rate limiting, email delivery and how the pieces fit together.

340 notes · updated 2026-08-14 · trained 83%

since last sitting: +24 newly passed — this brain is learning · the verified changelog →

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$ claude mcp add --transport http mozg \
https://mozg.sh/mcp --header "Authorization: Bearer …"
> use mozg/better-auth-concepts — …
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Ask it things like

answers 24/29 on its latest exam · anti-bluff 0/1
What are the core fields that must be present in the user table in Better Auth?Database Schema & Core Tables✓
What does the account table store and what is its relationship to the user table?Database Schema & Core Tables✓
What is the difference between before hooks and after hooks?Hooks & Lifecycle✓
What OAuth provider options are required for a social provider configuration?API & Providers✓
How do you infer the Session type from the auth client?Client & TypeScript✓
How should you add custom fields like role or language to the user object?Database Schema & Core Tables✓
What fields does the session table contain?Database Schema & Core Tables✓
What function sends a verification email and what are its required parameters?Email & Verification✓

What it can answer

29 coverage checks
83%
Answers 24 of the exam's 30 questionsIt answers 24 questions, 24 more than last time, out of an exam that grew by 30.Nothing it used to answer has stopped working.
✓Database Schema & Core Tables4 / 4
✓Sessions & Cookies4 / 4
✓Client & TypeScript3 / 3
▲Hooks & Lifecycle3 / 4
✓API & Providers2 / 2
▲Email & Verification2 / 3
✓Plugins & Architecture2 / 2
▲Rate Limiting2 / 3
▲Users & Accounts2 / 4
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Attacks survived

re-run weekly · 2026-08-11
✓gate-battery12/12 known hostile payloads caught by the ingest gate
✓injection-corpusevery active note scanned — no steering language
✓secret-corpusevery active note scanned — no keys or credentials

heuristic scans against known attack classes — measured and dated, not a promise of unpoisonability

Inside

  • Migrating Supabase Auth identities to Better Auth accounts · users & accounts
  • Better Auth database configuration with PlanetScale PostgreSQL · database schema & core tables
  • Basic Better Auth client sign-in method · client & typescript
  • Supabase to Better Auth user migration preserves user data · users & accounts
  • Migration from Supabase Auth invalidates active sessions · users & accounts
  • Better Auth session retrieval with useSession · sessions & cookies
  • Better Auth schema generation and migration · database schema & core tables
  • Two-factor authentication and RLS not covered in basic Supabase migration · users & accounts
  • OAuth Popup sign-in method · api & providers
  • OAuth Popup server setup with bearer plugin · plugins & architecture
  • OAuth Popup requirements · plugins & architecture
  • OAuth Popup client setup · plugins & architecture
  • OAuth Popup plugin purpose and use case · plugins & architecture
  • OAuth Popup security considerations · plugins & architecture

Licence

CC BY-NC-SA 4.0

Use it, copy it, build on it, with credit. Selling it is not allowed.