new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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explore / Web & frontend / mozg / Better Auth

Better Auth · Plugins

Answer questions about Better Auth plugins exactly as documented: every built-in plugin — organization, admin, two-factor, passkey, magic-link and the rest — with its configuration, schema additions and client methods.

1,067 notes · updated 2026-08-13 · trained 93%

since last sitting: +39 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-plugins — …
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Ask it things like

answers 39/42 on its latest exam · anti-bluff 0/1
How does the magic link send authentication to users?Magic Link Plugin✓
How do I enable passkey-first registration so users must register with a passkey?Passkey Plugin✓
What are the main methods available in the two-factor plugin?Two-Factor Plugin✓
How do I check if a user has a specific role or permission?Admin Plugin✓
What default roles does the admin plugin provide?Admin Plugin✓
How do I create custom roles with specific access control rules?Admin Plugin✓
What is Agent Auth and what are its main features?Agent Auth Plugin✓
What is the configId and referenceId in an API key object?API Key Plugin✓

What it can answer

42 coverage checks
93%
Answers 39 of the exam's 43 questionsIt answers 39 questions, 39 more than last time, out of an exam that grew by 43.Nothing it used to answer has stopped working.
✓Two-Factor Plugin4 / 4
✓Admin Plugin3 / 3
✓API Key Plugin3 / 3
✓Organization Plugin3 / 3
✓Passkey Plugin3 / 3
✓Payment & Billing Plugins3 / 3
✓SIWE Plugin3 / 3
✓Username Plugin3 / 3
✓Agent Auth Plugin2 / 2
✓Device Authorization Plugin2 / 2
✓Email OTP Plugin2 / 2
✓JWT Plugin2 / 2
✓OAuth & Social Login2 / 2
✓Plugin Architecture & Configuration2 / 2
▲Magic Link Plugin1 / 3
▲Multi-Session Plugin1 / 2
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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

  • OIDC discovery error codes · oauth & social login
  • IdP-initiated SAML callback URL configuration · oauth & social login
  • OIDC provider registration via registerSSOProvider · oauth & social login
  • Fields automatically discovered from OIDC discovery document · oauth & social login
  • SAML provider registration via registerSSOProvider · oauth & social login
  • IdP-initiated SAML SSO flow · oauth & social login
  • SSO plugin installation and setup · oauth & social login
  • SSO supports OIDC, OAuth2, and SAML 2.0 · oauth & social login
  • OIDC Discovery document fetching · oauth & social login
  • registerSSOProvider POST endpoint for OIDC (minimal config) · oauth & social login
  • Supported OIDC token authentication methods · oauth & social login
  • Better Auth does not support implicit-only OIDC flows · oauth & social login
  • SAML configuration parameters · oauth & social login
  • Get Service Provider metadata endpoint · oauth & social login

Licence

CC BY-NC-SA 4.0

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