set-up-nextjs-supabase-auth SKILL.md skillB
This file is byte-identical to the first copy the registry indexed, one of 3 indexed copies. Same content hash, so the same checks give both the same grade.
set-up-nextjs-supabase-auth from velimirmueller/claude-development-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add velimirmueller/claude-development-skills/set-up-nextjs-supabase-auth@git:20261009.24f5e39Pins git:20261009.24f5e39 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- velimirmueller/claude-development-skills
- Path
skills/backend/set-up-nextjs-supabase-auth/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261009.24f5e39, committed Oct 9, 2026
- First version recorded
- Oct 9, 2026
- Size
- 10,432 bytes
- Repository stars
- 6
- License
- MIT
Use when adding or fixing Supabase Auth in a Next.js 16 App Router app — @supabase/ssr cookie clients, session refresh in proxy.ts, verified getClaims() on the server, protected routes, PKCE callback and email-link routes, and sign-in by password, magic link or OAuth.
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
# Set Up Next.js + Supabase Auth
The session lives in httpOnly cookies, is refreshed in `proxy.ts`, and is **verified** on the server with `getClaims()`. Auth is server-side only: Server Actions and route handlers sign in, sign out and exchange the PKCE code, so JavaScript never reads a token. Redirects are UX; Postgres RLS is the authorization ([secure-supabase-rls](../secure-supabase-rls/SKILL.md)).
## 1. Audit current state
Read `.claude/stack-profile.md` (`frontend.meta: next`, `backend.track`). Then:
```bash
grep -n '"next"\|@supabase' package.json; ls middleware.ts src/middleware.ts proxy.ts src/proxy.ts 2>/dev/null
grep -rn "auth-helpers\|createClientComponentClient\|createServerComponentClient" src 2>/dev/null # deprecated package
grep -rn "getSession()" src --include=*.ts --include=*.tsx | grep -v "libs/supabase" # server use = trusting the cookie
grep -rn "createClient(" src | grep -v "src/libs/supabase" # clients outside the seam
ls src/app/auth src/libs/supabase src/server/auth.ts 2>/dev/null
grep -n "site_url\|additional_redirect_urls\|\[auth.email.template" supabase/config.toml
```
…Read the whole file at its exact version.
How to install
mdr add velimirmueller/claude-development-skills/set-up-nextjs-supabase-auth@sha256:5c815ddf64cb9804The line at the top of this page pins the label git:20261009.24f5e39, 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_g7oct6reycol6ica)
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Versions
The registry has recorded 3 versions of this file, all committed on Oct 9, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261009.24f5e39 latest | 2026-10-09 | 24f5e39 | 10,432 B | B | view · diff |
| git:20261009.d042141 | 2026-10-09 | d042141 | 9,438 B | B | view · diff |
| git:20261009.e2b6168 | 2026-10-09 | e2b6168 | 9,309 B | B | view |
Audit of the latest version
- fail: No link to a raw IP address (matched: http://127.0.0.1:54321)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10432 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 script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
velimirmueller/claude-development-skills · 6 stars · license MIT · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_g7oct6reycol6ica GET https://markdownregistry.com/api/v1/resolve?ref=velimirmueller/claude-development-skills/set-up-nextjs-supabase-auth GET https://markdownregistry.com/api/v1/blob/5c815ddf64cb9804b2524d0066e4e6e20982f6e59c7f2220219e7a0f8443037b
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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