better-auth SKILL.md skillA
better-auth from fusengine/agents is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add fusengine/agents/better-auth@git:20260927.43a351cPins git:20260927.43a351c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- fusengine/agents
- Path
plugins/nextjs-expert/skills/better-auth/SKILL.md- Versions recorded
- 6
- Latest version
- git:20260927.43a351c, committed Sep 27, 2026
- First version recorded
- Jan 31, 2026
- Size
- 9,073 bytes
- Repository stars
- 36
- License
- MIT
Use when implementing Next.js authentication with Better Auth — OAuth, 2FA, magic links, SSO, Stripe billing, or session management.
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
<objective> Implements Better Auth, a TypeScript-first authentication library, in a Next.js 16 App Router project: server config, client (`createAuthClient`), session management, and the `app/api/auth/[...all]/route.ts` handler, plus `proxy.ts` for route protection (replacing middleware). Covers the full surface — 40+ OAuth providers (Google, GitHub, Discord, Apple, Microsoft, and more), 20+ plugins (2FA, magic links, passkeys, organizations/multi-tenant, enterprise SSO/SAML, SCIM provisioning, Stripe/Polar billing, JWT/Bearer, API keys), and database adapters (Prisma, Drizzle, MongoDB, raw SQL). Also covers migration paths from Auth.js, Clerk, Auth0, Supabase, and WorkOS. While Better Auth itself is framework-agnostic, this skill's architecture guidance (proxy.ts, App Router API route) is Next.js-specific — for Prisma schema/query details see prisma-7. </objective> # Better Auth - Complete Authentication TypeScript-first authentication library with 40+ OAuth providers and 20+ plugins. ## Agent Workflow (MANDATORY) Before ANY implementation, spawn 3 agents in parallel, one `Agent` call each with a `name`: …
Read the whole file at its exact version.
How to install
mdr add fusengine/agents/better-auth@sha256:ea0dc3620948f56dThe line at the top of this page pins the label git:20260927.43a351c, 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.
[](https://markdownregistry.com/a/art_kitwjyoedpy4lgki)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Jan 31, 2026 and Sep 27, 2026, about one every 48 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260927.43a351c latest | 2026-09-27 | 43a351c | 9,073 B | A | view · diff |
| git:20260904.5f1d30f | 2026-09-04 | 5f1d30f | 8,304 B | A | view · diff |
| git:20260729.3b91eed | 2026-07-29 | 3b91eed | 8,275 B | A | view · diff |
| git:20260207.0a3cd21 | 2026-02-07 | 0a3cd21 | 7,454 B | A | view · diff |
| git:20260131.ff5ceca | 2026-01-31 | ff5ceca | 7,438 B | A | view · diff |
| git:20260131.6253d4e | 2026-01-31 | 6253d4e | 3,999 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9073 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
fusengine/agents · 36 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kitwjyoedpy4lgki GET https://markdownregistry.com/api/v1/resolve?ref=fusengine/agents/better-auth GET https://markdownregistry.com/api/v1/blob/ea0dc3620948f56d13f44d0f85f266f0c6cb84a64ed53e41ddcb3b4d81099a47
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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