A set of Supabase database rules for row-level security, authentication, service keys, and connection pooling. Supabase is a hosted database and application platform built around PostgreSQL.

Use it when a project uses Supabase to guide security policies, authenticated queries, views, service-role usage, and pooler-aware connections.

It helps prevent users from seeing other tenants' rows, keeps privileged service keys out of browser code, and avoids unsafe database connection patterns in serverless applications.

supabase — Cursor rule for Cursor by kleosr/kleosrules

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/kleosr/kleosrules

Made for: Cursor.

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/rules/kleosr/kleosrules/supabase/github.svg)](https://agentmods.dev/rules/kleosr/kleosrules/supabase)

Your own site

<a href="https://agentmods.dev/rules/kleosr/kleosrules/supabase"><img src="https://agentmods.dev/badge/rules/kleosr/kleosrules/supabase/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/rules/kleosr/kleosrules/supabase"><img src="https://agentmods.dev/badge/rules/kleosr/kleosrules/supabase.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 243 This file is loaded in full into every session.

When invoked 243 The same file — it is already loaded in full.

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	$0.00243	$0.00243
Opus 5.5	$0.00097	$0.00097
Sonnet 5.5	$0.00049	$0.00049
Haiku 4.5	$0.00024	$0.00024

Measured 1mo ago against content hash 34e6f7a9d911, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

supabase 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 1mo 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.

shared/rules/supabase.mdc · 16 lines

What it actually says

Supabase

Apply when this repo uses Supabase (client, CLI, or supabase/ paths); otherwise this file is inert. Composable with postgres.mdc (generic SQL there, RLS/auth/pooler here).

Hard

Tenant isolation follows the repo's model (often RLS + auth.uid()). Verify with negative tests: unauthenticated access, cross-user/tenant read, cross-user/tenant write, privileged backend paths, and views/functions that change privilege. No app-only WHERE user_id = guard without a matching policy.
Views: security_invoker = true on PG15+ when the intended model is invoker rights. Avoid SECURITY DEFINER to bypass RLS; allow it only with a safe search_path, least privilege, and review.
Service role never ships in client bundles. User JWT for user data.
Pooler-aware connections. No connection-per-request in serverless without the pooler.

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.

1mo ago Changed · -1 lines · -25 tokens per session 34e6f7a9d911
1mo ago Changed · -2 lines · +8 tokens per session 8c7ce677d2a4
1mo ago Changed · +47 tokens per session d507e3b2fb3e
1mo ago First seen · 19 lines · 213 tokens per session scan A ee49efe0cd48

Subscribe to this mod's changes

supabase is a cursor rule published in the GitHub repository kleosr/kleosrules (0 stars, last pushed 1mo ago), licensed MIT. It adds 243 tokens to every session, about $0.0010 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 2026-09-09.

Databases PostgreSQL Security bash cursor cursor-rules hooks

supabase

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

Supabase

Hard

What this file has done since we first saw it

Other cursor rules, from other repositories

30-database-postgres

postgresql

sql-rls-policies

sql-format

sql-functions

sql-migrations