Ready to supercharge your AI agents?

Install any skill in seconds. Free to start, no credit card required.

Authentication Patterns in Next.js · davepoon | DecimalAI

frontendby davepoon

Authentication Patterns in Next.js

davepoon/auth-patterns

Source davepoon/buildwithclaude ↗License MIT

This skill should be used when the user asks about "authentication in Next.js", "NextAuth", "Auth.js", "middleware auth", "protected routes", "session management", "JWT", "login flow", or needs guidance on implementing authentication and authorization in Next.js applications.

SkillScore96Maintained

Automatic

Frontend / UI pack

Last verified 8/10/2026

What it changes

Passed 22 of 23 test cases with the skill, and 21 of 23 without it.

Without skill91%

With skill96%

Checks it passed that the model alone missed

The component checks if session?.user?.role is not equal to 'admin' before invoking redirect.

1 fixed21 passed either way1 still failing0 broke

Pass-rate lift: +4 pp
Tokens: +110%
Agent turns: 0%
Response time: -29%

Model gemini-3.6-flashMeasured 8/10/2026v122 of 23 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/davepoon-auth-patterns/SKILL.md https://app.decimal.ai/s/davepoon-auth-patterns/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add davepoon-auth-patterns, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/davepoon-auth-patterns/ and pins it in .decimal/skills.lock

decimalai skills add davepoon-auth-patterns

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/davepoon-auth-patterns/SKILL.md https://app.decimal.ai/s/davepoon-auth-patterns/SKILL.md

Raw file: /s/davepoon-auth-patterns/SKILL.md ↗ · machine-readable summary at /s/davepoon-auth-patterns.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

A test case the skill fixed. Same model, same prompt, with and without the skill.

Prompt

I need an async React Server Component `AdminOnly` in Next.js that checks if the logged-in session has an 'admin' role, and redirects unauthorized users to `/unauthorized`. How should the authorization check be phrased?

What was checked, without and with the skill
Checked	Without skill	With skill
The component checks if session?.user?.role is not equal to 'admin' before invoking redirect.	Missed	Passed

case-13 · gemini-3.6-flash · 8/10/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md396 lines3 files

Authentication Patterns in Next.js

Overview

Next.js supports multiple authentication strategies. This skill covers common patterns including NextAuth.js (Auth.js), middleware-based protection, and session management.

Authentication Libraries

Library	Best For
NextAuth.js (Auth.js)	Full-featured auth with providers
Clerk	Managed auth service
Lucia	Lightweight, flexible auth
Supabase Auth	Supabase ecosystem
Custom JWT	Full control

NextAuth.js v5 Setup

Installation

npm install next-auth@beta

Configuration

// auth.ts
import NextAuth from 'next-auth'
import GitHub from 'next-auth/providers/github'
import Credentials from 'next-auth/providers/credentials'

export const { handlers, auth, signIn, signOut } = NextAuth({
  providers: [
    GitHub({
      clientId: process.env.GITHUB_ID,
      clientSecret: process.env.GITHUB_SECRET,
    }),
    Credentials({
      credentials: {

Track record

Benchmark

22 / 23

test cases passed, vs 21 / 23 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

davepoon / buildwithclaude

plugins/nextjs-expert/skills/auth-patterns/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1Bundled 2 files

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Authentication Patterns in Next.js

Overview

Authentication Libraries

NextAuth.js v5 Setup

Installation

Configuration

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills