supabase-security

supabase-security is a plugin for Claude Code from yorrick/agent-skills. Its manifest loads nothing; the 1 skill it bundles cost 205 tokens per session together, scanned A, original, MIT.

Security rules for Supabase projects that let browsers access database data through PostgREST. It explains database permissions, row-level security, triggers, anonymous keys, JWTs, and service-role keys.

In plain words
What is it for?
Use it when checking Supabase grants, row-level security policies, triggers, authentication tokens, and service-role access.
Why use it?
It helps developers avoid access-control mistakes that could let users read or change data they should not reach.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit Use it when checking Supabase grants, row-level security policies, triggers, authentication tokens, and service-role access.

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Install in Claude Code
/plugin marketplace add yorrick/agent-skills
/plugin install supabase-security
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/yorrick/agent-skills

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-security

README.md
[![agentmods](https://agentmods.dev/badge/plugins/yorrick/agent-skills/supabase-security/github.svg)](https://agentmods.dev/plugins/yorrick/agent-skills/supabase-security)
Your own site
<a href="https://agentmods.dev/plugins/yorrick/agent-skills/supabase-security"><img src="https://agentmods.dev/badge/plugins/yorrick/agent-skills/supabase-security/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.

agentmods 80×15 button for supabase-security

Your own site · 80×15
<a href="https://agentmods.dev/plugins/yorrick/agent-skills/supabase-security"><img src="https://agentmods.dev/badge/plugins/yorrick/agent-skills/supabase-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 1 skill cost 205 tokens a session between them.
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.
Security

Grade A, and why

supabase-security 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 21d 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.

supabase-security/.claude-plugin/plugin.json · 11 lines

What it actually says

{
  "name": "supabase-security",
  "description": "Access-control rules for Supabase projects exposed directly to a browser via PostgREST. Covers the three enforcement layers (GRANT, RLS, triggers), the traps that cause privilege escalation, and how anon keys, JWTs and service_role actually differ.",
  "version": "0.1.3",
  "author": {
    "name": "Yorrick Jansen"
  },
  "repository": "https://github.com/yorrick/agent-skills",
  "license": "MIT"
}
Contents

What it installs

The manifest is a name and a version. 1 skill travel with it, and installing the plugin installs all of them — 205 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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. 21d ago Changed 3ea666c070b7
  2. 1mo ago First seen · 11 lines scan A ef937826bce3

Subscribe to this mod's changes

supabase-security is a plugin published in the GitHub repository yorrick/agent-skills (11 stars, last pushed 11d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-31.