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Supabase Expert · velcrafting | DecimalAI

codingby velcrafting

Supabase Expert

velcrafting/supabase-expert

Source velcrafting/codex-skills ↗License Not recorded

This skill should be used when the user asks to "create a Supabase table", "write RLS policies", "set up Supabase Auth", "create Edge Functions", "configure Storage buckets", "use Supabase with Next.js", "migrate API keys", "implement row-level security", "create database functions", "set up SSR auth", or mentions 'Supabase', 'RLS', 'Edge Function', 'Storage bucket', 'anon key', 'service role', 'publishable key', 'secret key'. Automatically triggers when user mentions 'database', 'table', 'SQL',

SkillScore100Maintained

Automatic

Coding pack

Last verified 8/3/2026

What it changes

Passed 22 of 22 test cases with the skill, and 12 of 22 without it.

Without skill55%

With skill100%

Checks it passed that the model alone missed

The function body includes SET search_path = ''.
The function definition specifies SECURITY INVOKER.
SQL keywords in the script are written in lowercase.

and 9 more in the full report

10 fixed12 passed either way0 still failing0 broke

Pass-rate lift: +45 pp
Tokens: +160%
Agent turns: 0%
Response time: -12%

Model gemini-3.6-flashMeasured 8/3/2026v122 of 22 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/velcrafting-supabase-expert/SKILL.md https://app.decimal.ai/s/velcrafting-supabase-expert/SKILL.md

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

decimalai skills add velcrafting-supabase-expert

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

curl -fsSL --create-dirs -o .claude/skills/velcrafting-supabase-expert/SKILL.md https://app.decimal.ai/s/velcrafting-supabase-expert/SKILL.md

Raw file: /s/velcrafting-supabase-expert/SKILL.md ↗ · machine-readable summary at /s/velcrafting-supabase-expert.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 10

Prompt

Provide the client-side initialization function for Supabase in a Next.js browser component. Which API key variable should be passed to createBrowserClient?

What was checked, without and with the skill
Checked	Without skill	With skill
The client initialization references NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY.	Missed	Passed

case-16 · gemini-3.6-flash · 8/3/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md359 lines11 filesincludes scripts

Supabase Expert

Overview

Comprehensive guidance for working with Supabase including database operations, authentication, storage, edge functions, and Next.js integration. Enforces security patterns, performance optimizations, and modern best practices.

Critical Rules

API Keys (New System)

Supabase now offers two key types with improved security:

Key Type	Prefix	Safety	Use Case
Publishable	`sb_publishable_...`	Safe for client	Browser, mobile, CLI
Secret	`sb_secret_...`	Backend only	Servers, Edge Functions
Legacy anon	JWT-based	Safe for client	Being deprecated
Legacy service_role	JWT-based	Backend only	Being deprecated

Key Rules:

Secret keys return HTTP 401 if used in browser
New keys support independent rotation without downtime
Migrate from legacy keys when possible

See references/api-keys.md for migration guide and security practices.

Authentication SSR Rules

NEVER USE (DEPRECATED):

Individual cookie methods: get(), set(), remove()
Package: @supabase/auth-helpers-nextjs

ALWAYS USE:

Package: @supabase/ssr
Cookie methods: getAll() and setAll() ONLY
Proxy (formerly Middleware) MUST call getUser() to refresh session
Proxy MUST return supabaseResponse object

Important: As of Next.js 16+, use proxy.ts instead of middleware.ts. See https://nextjs.org/docs/app/api-reference/file-conventions/proxy

Track record

Benchmark

22 / 22

test cases passed, vs 12 / 22 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 — 8/1/2026

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

velcrafting / codex-skills

skills/supabase/SKILL.md

View on GitHub ↗

Imported 8/1/2026Version v1Bundled 10 files · scripts

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

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

Supabase Expert

Overview

Critical Rules

API Keys (New System)

Authentication SSR Rules

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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