Nextjs Supabase Auth

Organization

Asymmetric-al

nextjs-supabase-auth

Integrate Supabase Auth with Next.js App Router using middleware, callback handling, protected routes, and server/client client boundaries.

Overview

Publisher	Asymmetric-al
Repository	`core`
Skill name	`nextjs-supabase-auth`
Stars	383
Forks	7
Bundled files	Instructions only
License	MIT
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by Asymmetric-al on GitHub. Read the source before you install it.

Installation

Install the Nextjs Supabase Auth AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/Asymmetric-al/core.git /tmp/core
mkdir -p .claude/skills
cp -r /tmp/core/docs/ai/skills/nextjs-supabase-auth .claude/skills/nextjs-supabase-auth

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Nextjs Supabase Auth in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Nextjs Supabase Auth on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Nextjs Supabase Auth is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Next.js + Supabase Auth

Use this skill for authentication work in Next.js App Router with Supabase Auth.

When to Apply

Use this skill when:

Implementing login/signup/logout and session flows
Protecting routes with middleware
Handling auth callback exchanges
Wiring auth checks in Server Components, Server Actions, and route handlers
Debugging cookie/session desync between server and client

Do not use this skill when:

The task is primarily query/index/schema optimization (use supabase-postgres-best-practices)
The task spans broader Supabase surface area beyond Next.js auth wiring (use docs/ai/skills/supabase/SKILL.md)
The task is UI-only and does not change auth behavior

Core Rules

Use @supabase/ssr patterns for App Router integration.
Use @/lib/supabase/server for server-side code and @/lib/supabase/client for client-side code.
Use middleware to refresh and enforce session state on protected routes.
Do not manually store or forward auth tokens in client code.
Use Server Actions (or secure route handlers) for privileged auth operations.
Maintain RLS assumptions; do not bypass policy boundaries.

Workflow

Identify execution boundary first (server component, client component, middleware, action, or route handler).
Ensure the correct Supabase client is used for that boundary.
Verify middleware coverage for protected routes.
Verify callback handling exchanges auth code/session correctly.
Validate auth checks before sensitive reads/writes.
Verify end-to-end login/logout/session refresh behavior.

Checklist

Server code imports @/lib/supabase/server
Client code imports @/lib/supabase/client
Protected paths are covered by auth middleware
Callback route/session exchange is correctly handled
No service role keys in client-side code
No manual token persistence logic added

Common Anti-Patterns

Using browser clients in server actions
Using server clients in client components
Calling getSession blindly in server render paths without user validation
Storing JWTs manually in localStorage/cookies

Frequently asked questions

What does the Nextjs Supabase Auth AI skill do?

Integrate Supabase Auth with Next.js App Router using middleware, callback handling, protected routes, and server/client client boundaries.

Why use Nextjs Supabase Auth on TypingMind?

Because you install it once and use it with any model. Nextjs Supabase Auth is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Nextjs Supabase Auth in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/Asymmetric-al/core/tree/develop/docs/ai/skills/nextjs-supabase-auth. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Nextjs Supabase Auth?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Nextjs Supabase Auth?

As many as you like. As long as a model supports skills, you can use Nextjs Supabase Auth with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Nextjs Supabase Auth AI skill free?

Yes. It is published on GitHub by Asymmetric-al under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Next.js + Supabase Auth

When to Apply

Core Rules

Workflow

Checklist

Common Anti-Patterns

Frequently asked questions

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