audit-log-multi-tenant

audit-log-multi-tenant is a skill for Claude Code, Codex from luanpdd/kit-mcp. It costs 59 tokens per session (3,282 once invoked), scanned A, original, MIT.

A design for append-only audit logs in a multi-tenant application, where records from different customer organizations share a system but must remain separated. It covers permissions, retention, legal holds, personal-data handling, and event types.

In plain words
What is it for?
Use it when implementing Supabase audit logs for B2B software, including tenant filtering, retention schedules, LGPD legal holds, personal-data hashing, and canonical event tracking.
Why use it?
It preserves evidence by preventing ordinary users from editing or deleting log records. It also supports retention rules and privacy requests without losing important compliance information.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: positional $N argument.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is A tabela `audit_log` append-only mapeia diretamente para padrão **event sourcing** (DDIA Ch 11) — eventos são source-of-truth, projeções (denormalizações via tr.

Good fit Use it when implementing Supabase audit logs for B2B software, including tenant filtering, retention schedules, LGPD legal holds, personal-data hashing, and canonical event tracking.

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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 skills/luanpdd/kit-mcp/audit-log-multi-tenant

Made for: Claude Code, Codex.

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 audit-log-multi-tenant

README.md
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agentmods 80×15 button for audit-log-multi-tenant

Your own site · 80×15
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Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,282 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 $0.00059 $0.03282
Opus 5 $0.00030 $0.01641
Sonnet 5 $0.00012 $0.00656
Haiku 4.5 $0.00006 $0.00328

Measured 6d ago against content hash bd27ddc0ddac, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

audit-log-multi-tenant 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 6d 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/skills/audit-log-multi-tenant/SKILL.md · 342 lines

How it starts

The opening of the file, as written. The whole thing — 342 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Audit Log Multi-Tenant — Compliance + Forensics

Quando usar

LLM carrega esta skill ao implementar audit log em B2B SaaS multi-tenant. Trigger phrases:

  • "audit log multi-tenant", "audit trail compliance"
  • "append-only table Postgres", "REVOKE DELETE UPDATE"
  • "retention pg_cron tiers"
  • "legal hold LGPD erasure"
  • "PII sanitization audit"
  • "event taxonomy canônica"

Esta skill é consumida pelo agent audit-log-implementer (Phase 109) que materializa migration + retention scheduler.

Regras absolutas

REGRA #1 (append-only): Tabela audit_logs é append-only via REVOKE DELETE, UPDATE ON public.audit_logs FROM authenticated. Apenas service_role pode mutar (via partition swap, raramente). Comprometimento de admin não consegue apagar evidências.

REGRA #2 (tenant_id obrigatório indexed first): Toda row em audit_logs tem tenant_id (= org_id) NOT NULL + index composite (tenant_id, created_at desc) como primeira coluna. Sem isso, queries "todos eventos da org X" viram table scan.

REGRA #3 (legal_hold flag): Coluna legal_hold boolean default false. Quando user da org X faz DSR LGPD de erasure, marcar legal_hold = true em todas suas rows pendentes — bloqueia delete pelo retention scheduler até DSR processada.

REGRA #4 (PII sanitization): actor_email e target_email armazenados como SHA-256 hash (não raw). Para investigação, forensic mode rehasha email candidato e busca match. PII em log = LGPD violation.

REGRA #5 (retention 3 tiers): Default retention via pg_cron:

  • Free tier: 30 dias
  • Pro tier: 90 dias
  • Enterprise tier: 365 dias
  • Sempre respeitando legal_hold = true (skip rows com legal hold)

REGRA #6 (event taxonomy mínima — 7 events): login, member_invited, role_changed, data_exported, member_removed, settings_changed, super_admin_action. Custom events permitidos via campo event_type text mas estes 7 são obrigatórios em qualquer app B2B.

Patterns canônicos

Tabela audit_logs — DDL completo

Read the full file on GitHub · 342 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. 6d ago First seen · 342 lines · 59 tokens per session scan A bd27ddc0ddac

Subscribe to this mod's changes

audit-log-multi-tenant is a skill published in the GitHub repository luanpdd/kit-mcp (1 stars, last pushed 2d ago), licensed MIT. It adds 59 tokens to every session and 3,282 once invoked, about $0.0003 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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