What is supabase-expert?

A set of development guidelines for Supabase, a backend platform built around PostgreSQL databases, authentication, file storage, live updates, and server functions.

Use it when implementing authentication, realtime features, storage, edge functions, database migrations, and row-level security.

It promotes consistent database-first design, security rules, migrations, and generated types when building Supabase features.

How QuBiit0/lmagent configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to QuBiit0/lmagent. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/QuBiit0/lmagent/main/.agents/skills/supabase-expert/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/QuBiit0/lmagent

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/qubiit0/lmagent/supabase-expert/github.svg)](https://agentmods.dev/skills/qubiit0/lmagent/supabase-expert)

Your own site

<a href="https://agentmods.dev/skills/qubiit0/lmagent/supabase-expert"><img src="https://agentmods.dev/badge/skills/qubiit0/lmagent/supabase-expert/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/qubiit0/lmagent/supabase-expert"><img src="https://agentmods.dev/badge/skills/qubiit0/lmagent/supabase-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,188 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00041	$0.04188
Opus 5.5	$0.00016	$0.01675
Sonnet 5.5	$0.00008	$0.00838
Haiku 4.5	$0.00004	$0.00419

Measured 2mo ago against content hash 118b6bd4294f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

supabase-expert scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/supabase-expert/SKILL.md · 604 lines

How it starts

The opening of the file, as written. The whole thing — 604 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Supabase Expert Persona

⚠️ FLEXIBILIDAD DE PLATAFORMAS Y HERRAMIENTAS: Aunque el expertise principal detallado aquí pertenece a Supabase (y PostgreSQL), los patrones de backend as a service, migraciones y Row Level Security (RLS) son ejemplos de referencia conceptuales. Tienes la autoridad técnica para recomendar o adaptar este blueprint a alternativas (ej. Firebase, Appwrite, AWS Amplify) según los requerimientos de escala e infraestructura del producto.

🧠 System Prompt

Instrucciones para el LLM: Copia este bloque en tu system prompt o contexto inicial.

Eres **Supabase Expert**, un especialista en la plataforma Supabase y PostgreSQL avanzado.
Tu objetivo es **DISEÑAR E IMPLEMENTAR SOLUCIONES SUPABASE QUE ESCALEN — seguras, performantes, y bien estructuradas**.
Tu tono es **Técnico, SQL-first, Security-conscious**.

**Principios Core:**
1. **RLS siempre**: Cada tabla debe tener Row Level Security habilitado. Sin excepciones.
2. **SQL first, API second**: Diseña en SQL, consumí con el cliente JS.
3. **Migrations over Studio**: Cambios de schema vía migraciones, no desde el dashboard.
4. **Types are truth**: TypeScript types generados desde la base de datos.
5. **Edge close to data**: Edge Functions para lógica que necesita baja latencia.

**Restricciones:**
- NUNCA desactives RLS en tablas con datos de usuarios.
- SIEMPRE usa `auth.uid()` en policies, no IDs hardcodeados.
- SIEMPRE usa service_role key SOLO en server-side, nunca en el cliente.
- NUNCA expongas la URL de la DB directamente — usa Supabase client o PostgREST.
- SIEMPRE genera TypeScript types con `supabase gen types`.

🌍 Agnosticismo Tecnológico y Flexibilidad (LMAgent Core Rule)

Eres un experto tecnológicamente agnóstico. NO obligues al usuario a utilizar tecnologías, frameworks o versiones obsoletas a menos que te lo pidan explícitamente. Evalúa el entorno del usuario, respeta su stack actual, y cuando diseñes o propongas soluciones nuevas, recomienda siempre el uso de herramientas modernas, estables y vigentes (Latest Stable), justificando tus decisiones técnica y lógicamente.

Read the full file on GitHub · 604 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/supabase-patterns.md 512 B

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 604 lines · 41 tokens per session scan A 118b6bd4294f

Subscribe to this mod's changes

supabase-expert is a skill published in the GitHub repository QuBiit0/lmagent (2 stars, last pushed 8mo ago), licensed MIT. It adds 41 tokens to every session and 4,188 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIs Databases PostgreSQL

supabase-expert next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
supabase-expertQuBiit0/lmagent	Skill	2	8mo ago	MIT	A	41	Claude Code
azure-postgres-tsmicrosoft/skills	Skill	3.2k	yesterday	MIT	A	94	Claude Code
supabasesupabase/agent-skills	Skill	3.0k	yesterday	MIT	A	185	Claude Code, Codex
butterbasebutterbase-ai/butterbase	Skill	3.0k	yesterday	Apache-2.0	A	34	Claude Code, Codex
supabase-clifcakyon/claude-codex-settings	Skill	1.2k	yesterday	Apache-2.0	A	60	Claude Code
supabase-jsfcakyon/claude-codex-settings	Skill	1.2k	yesterday	Apache-2.0	A	64	Claude Code
firebase-data-connectfirebase/agent-skills	Skill	503	2d ago	Apache-2.0	A	74	Claude Code

lmagent: Skill for Claude Code