What is supabase-storage-implementer?

A Supabase Storage implementation agent for uploading and downloading files. It configures the storage bucket, access rules, and client code for uploads or temporary signed links.

Use it to add public or private uploads with user- or organisation-based file paths and secure download links.

It helps keep file access separated between users or organisations instead of treating storage as an unprotected shared folder.

supabase-storage-implementer — Agent for Claude Code by luanpdd

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/luanpdd/kit-mcp

agentmods

npx agentmods add agents/luanpdd/kit-mcp/supabase-storage-implementer

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/agents/luanpdd/kit-mcp/supabase-storage-implementer.svg)](https://agentmods.dev/agents/luanpdd/kit-mcp/supabase-storage-implementer)

Your own site

<a href="https://agentmods.dev/agents/luanpdd/kit-mcp/supabase-storage-implementer"><img src="https://agentmods.dev/badge/agents/luanpdd/kit-mcp/supabase-storage-implementer.svg" alt="Measured on agentmods" height="20"></a>

Per session 49 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 4,320 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	$0.00049	$0.04320
Opus 5	$0.00024	$0.02160
Sonnet 5	$0.00010	$0.00864
Haiku 4.5	$0.00005	$0.00432

Measured 3d ago against content hash 715ae4c56a49, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

supabase-storage-implementer 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 3d 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.

kit/agents/supabase-storage-implementer.md · 418 lines

How it starts

The opening of the file, as written. The whole thing — 418 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Você é o storage-implementer Supabase. Recebe descrição de feature de upload/download e configura 3 layers: (1) bucket (público vs privado), (2) RLS sobre storage.objects com path multi-tenant, (3) código client-side de upload/signed URL.

Compat: Full em Claude Code + Cursor (com Supabase MCP); Partial em Codex + Gemini CLI; Offline-only em Windsurf/Antigravity/Copilot/Trae. Veja COMPATIBILITY.md.

Por que existe

Storage parece simples mas tem armadilhas: bucket privado sem RLS = qualquer authenticated lê tudo; path sem tenant prefix = users sobrescrevem arquivos uns dos outros; egress sem cache = custo explode em produção. Este agent escreve as 3 layers em conjunto, com multi-tenant path como default.

Inputs esperados (do caller)

feature_name: descrição (ex: "avatar de usuário", "documentos privados", "imagens de perfil públicas")
bucket_name: nome do bucket (kebab-case, ex: private-uploads, public-avatars)
privacy: private (default) | public
tenant_pattern: per_user (default — <auth.uid()>/<file>) | per_org (<org_id>/<file>) | none (apenas public buckets)
(Opcional) image_transforms: true para habilitar transformations (Pro+ plan)
(Opcional) max_file_size_mb: 6 (default — limite normal); se > 6, configura TUS

Passos

Step 0 — Preflight

Detectar MCP. Se indisponível, modo offline.

Step 1 — Decidir privacy + alert

Default: private. Se caller pede public, alerte sobre egress:

⚠ Bucket público — atenção a egress billing.

Cada download é cobrado. Para reduzir custo:
- cacheControl alto no upload (1 ano para assets imutáveis)
- versionar arquivos (hero-v2.jpg) em vez de overwrite (CDN cache stale)
- considerar Smart CDN configurado

Step 2 — Criar bucket (live mode)

Live mode (com MCP):

-- via execute_sql
insert into storage.buckets (id, name, public, file_size_limit, allowed_mime_types)
values (
  '<bucket_name>',
  '<bucket_name>',
  <true|false>,                         -- public flag
  <max_file_size_mb> * 1024 * 1024,     -- bytes
  null                                   -- ou array de mime types: '{image/jpeg,image/png}'::text[]
);

Read the full file on GitHub · 418 lines

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.

3d ago First seen · 418 lines · 49 tokens per session scan A 715ae4c56a49

Subscribe to this mod's changes

supabase-storage-implementer is an agent published in the GitHub repository luanpdd/kit-mcp (1 stars, last pushed 7d ago), licensed MIT. It adds 49 tokens to every session and 4,320 once invoked, about $0.0002 per session on Opus 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 2026-09-03.

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