supabase-rbac-implementer

supabase-rbac-implementer is an agent for Claude Code from luanpdd/kit-mcp. It costs 48 tokens per session (4,175 once invoked), scanned A, original, MIT.

A Supabase assistant for role-based access control, or RBAC, where permissions are assigned through roles such as admin or editor. It stores those permissions in token claims and applies them to database policies and client code.

In plain words
What is it for?
It creates role and permission tables, the access-token hook, authorization functions, row-level security templates, required grants, and client claim-decoding code.
Why use it?
It reduces the chance that one missing database grant, hook permission, or policy will silently remove or weaken application authorization.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: mentions subagents.

Good fit It creates role and permission tables, the access-token hook, authorization functions, row-level…

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/luanpdd/kit-mcp/supabase-rbac-implementer
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

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

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.

agentmods badge for supabase-rbac-implementer

README.md
[![agentmods](https://agentmods.dev/badge/agents/luanpdd/kit-mcp/supabase-rbac-implementer.svg)](https://agentmods.dev/agents/luanpdd/kit-mcp/supabase-rbac-implementer)
Your own site
<a href="https://agentmods.dev/agents/luanpdd/kit-mcp/supabase-rbac-implementer"><img src="https://agentmods.dev/badge/agents/luanpdd/kit-mcp/supabase-rbac-implementer.svg" alt="Measured on agentmods" height="20"></a>
Per session 48 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 4,175 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00048 $0.04175
Opus 5 $0.00024 $0.02087
Sonnet 5 $0.00010 $0.00835
Haiku 4.5 $0.00005 $0.00417

Measured 3d ago against content hash 498e398ea10c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

supabase-rbac-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-rbac-implementer.md · 398 lines

How it starts

The opening of the file, as written. The whole thing — 398 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Você é o canonical materializer Custom Claims & RBAC via Custom Access Token Auth Hook em Supabase. Recebe spec (roles + permissions matrix) via Task() upstream context + intent original, e produz setup completo: enum types + 2 tables + auth hook function + supabase_auth_admin grants + authorize() function + RLS policies template + client decoder snippet. Verdicts construtivos GO/STRENGTHEN/REWRITE-com-confirmação alinhados com supabase-rls-hardener (v1.23) e supabase-column-privileges-writer (v1.24).

Princípio canônico v1.23 (herdado v1.25): Agents não-Supabase pensam/planejam; você materializa/hardena. Nenhum lado descarta o outro — quando há conflito de patterns, você explica via diff e propõe alternativa, nunca reescreve silenciosamente.

Por que existe

RBAC via Custom Access Token Auth Hook é setup de 7 passos canônicos. Esquecer qualquer um quebra silenciosamente:

  • Esquecer GRANT EXECUTE ON FUNCTION ... TO supabase_auth_admin → hook falha silenciosamente; JWT issued sem claim
  • Esquecer REVOKE EXECUTE FROM public → qualquer cliente pode chamar hook diretamente (abuse)
  • Esquecer RLS policy permitindo supabase_auth_admin ler user_roles → hook não consegue ler role
  • Esquecer set search_path = '' em authorize() → schema injection vulnerability
  • Hardcode role em policy ao invés de usar authorize() → policies acopladas (não composable)

Este agent serve como canonical handoff target para agents externos (multi-tenant-rls-writer, super-admin-implementer, audit-log-implementer) que precisam materializar RBAC com segurança.

Inputs esperados (do caller via Task())

prompt: |
  <upstream_intent>
  Source agent: {caller_name}
  Original goal: {1-2 sentence}
  Constraints / business rules: {regras de domínio}
  </upstream_intent>

  <roles>
  - admin: full access
  - moderator: limited access
  - user: standard
  </roles>

  <permissions_matrix>
  admin:
    - channels.delete
    - channels.create
    - messages.delete
    - users.ban
  moderator:
    - messages.delete
  user: []
  </permissions_matrix>

  <multi_tenant>{true | false}</multi_tenant>
  <user_facing_caller>{true | false}</user_facing_caller>

Read the full file on GitHub · 398 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.

  1. 3d ago First seen · 398 lines · 48 tokens per session scan A 498e398ea10c

Subscribe to this mod's changes

supabase-rbac-implementer is an agent published in the GitHub repository luanpdd/kit-mcp (1 stars, last pushed 6d ago), licensed MIT. It adds 48 tokens to every session and 4,175 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.

Related

Other agents, from other repositories

Power Platform MCP Integration Expert

Expert in Power Platform custom connector development with MCP integration for Copilot Studio - comprehensive knowledge of schemas, protocols, and integration patterns.

github/awesome-copilot · 31 tokens

php-developer

Write idiomatic PHP code with design patterns, SOLID principles, and modern best practices. Implements PSR standards, dependency injection, and comprehensive testing. Use PROACTIVELY for PHP architecture, refactoring, or implementing design patterns.

davepoon/buildwithclaude · 51 tokens

backend-reviewer

Use when reviewing service-layer logic, module boundaries, business rules, or cross-service contracts — verifies architecture integrity and service correctness against the api and architect persona standards.

jeremylongshore/tons-of-skills-marketplace · 36 tokens

integrations-engineer

Third-party integration specialist for SMB Product-Builder archetypes. Owns the integration contract — OAuth2/API-key flows, webhook signature verification, idempotency keys, retry/backoff with jitter, rate-limit handling, secret storage, and sandbox→prod promotion — for Stripe, Twilio, QuickBooks, Google/Microsoft…

avelikiy/great_cto · 106 tokens

gate

API quality gates — linting, style enforcement, breaking change CI, and API governance.

tonone-ai/tonone · 19 tokens

dotnet-architecture-reviewer

Reviews a .NET codebase or repository and produces a structured architecture report — layering and dependency-rule violations, coupling, CQRS/handler hygiene, EF Core boundary leaks, testability, and concrete prioritized fixes. Use when the user wants an architecture review, a "second opinion" on structure, a PR-level…

StefanTheCode/dotnet-ai-toolkit · 102 tokens