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Next.js + Supabase Auth · dokhacgiakhoa | DecimalAI

codingby dokhacgiakhoa

Next.js + Supabase Auth

dokhacgiakhoa/nextjs-supabase-auth

Source dokhacgiakhoa/agent-skills-4-vibe-coding-cli ↗License NOASSERTION

Expert integration of Supabase Auth with Next.js App Router

SkillScore100Maintained

Automatic

Frontend / UI pack

Last verified 8/29/2026

What it changes

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

Without skill96%

With skill100%

Checks it passed that the model alone missed

Recommends calling `getUser()` to validate authentication.
Recommends initializing `@supabase/ssr` server client inside the route handler.

1 fixed22 passed either way0 still failing0 broke

Pass-rate lift: +4 pp
Tokens: -2%
Agent turns: 0%
Response time: -13%

Model gemini-3.6-flashMeasured 8/29/2026v123 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/dokhacgiakhoa-nextjs-supabase-auth/SKILL.md https://app.decimal.ai/s/dokhacgiakhoa-nextjs-supabase-auth/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add dokhacgiakhoa-nextjs-supabase-auth, 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/dokhacgiakhoa-nextjs-supabase-auth/ and pins it in .decimal/skills.lock

decimalai skills add dokhacgiakhoa-nextjs-supabase-auth

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

curl -fsSL --create-dirs -o .claude/skills/dokhacgiakhoa-nextjs-supabase-auth/SKILL.md https://app.decimal.ai/s/dokhacgiakhoa-nextjs-supabase-auth/SKILL.md

Raw file: /s/dokhacgiakhoa-nextjs-supabase-auth/SKILL.md ↗ · machine-readable summary at /s/dokhacgiakhoa-nextjs-supabase-auth.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

How should an API Route Handler in Next.js App Router verify if a request is authenticated before returning sensitive user data?

What was checked, without and with the skill
Checked	Without skill	With skill
Recommends initializing `@supabase/ssr` server client inside the route handler.	Missed	Passed
Recommends calling `getUser()` to validate authentication.	Missed	Passed

case-19 · gemini-3.6-flash · 8/29/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md35 linessingle file

Next.js + Supabase Auth

You are an expert in integrating Supabase Auth with Next.js App Router. You understand the server/client boundary, how to handle auth in middleware, Server Components, Client Components, and Server Actions.

Your core principles:

Use @supabase/ssr for App Router integration
Handle tokens in middleware for protected routes
Never expose auth tokens to client unnecessarily
Use Server Actions for auth operations when possible
Understand the cookie-based session flow

Capabilities

nextjs-auth
supabase-auth-nextjs
auth-middleware
auth-callback

Requirements

nextjs-app-router
supabase-backend

Patterns

🧠 Knowledge Modules (Fractal Skills)

1. Supabase Client Setup

2. Auth Middleware

3. Auth Callback Route

4. ❌ getSession in Server Components

5. ❌ Auth State in Client Without Listener

6. ❌ Storing Tokens Manually

Track record

Benchmark

23 / 23

test cases passed, vs 22 / 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 — 8/10/2026

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

dokhacgiakhoa / agent-skills-4-vibe-coding-cli

.agent/skills/nextjs-supabase-auth/SKILL.md

View on GitHub ↗

License NOASSERTIONImported 8/10/2026Version v1

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See it in action

What's inside

Next.js + Supabase Auth

Capabilities

Requirements

Patterns

🧠 Knowledge Modules (Fractal Skills)

1. Supabase Client Setup

2. Auth Middleware

3. Auth Callback Route

4. ❌ getSession in Server Components

5. ❌ Auth State in Client Without Listener

6. ❌ Storing Tokens Manually

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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