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.
git clone --depth 1 https://github.com/luanpdd/kit-mcpWrote 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.
[](https://agentmods.dev/agents/luanpdd/kit-mcp/supabase-rbac-implementer)<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>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 | $0.00048 | $0.04175 |
| Opus 5 | $0.00024 | $0.02087 |
| Sonnet 5 | $0.00010 | $0.00835 |
| Haiku 4.5 | $0.00005 | $0.00417 |
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.
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_adminleruser_roles→ hook não consegue ler role - Esquecer
set search_path = ''emauthorize()→ 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>
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 · 398 lines · 48 tokens per session scan A 498e398ea10c
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.
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