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firebase-security-rules-auditor

firebase-security-rules-auditor is a skill for Claude Code, Codex from seaworld008/Commonly-used-high-value-skills. It costs 34 tokens per session (1,465 once invoked), scanned A, original, MIT.

A security review process for Firebase Firestore and Cloud Storage rules. Firebase rules control who can read, create, and change stored data.

In plain words
What is it for?
Use it to audit new or changed Firebase rules, check data-model changes, and review tests run with the Firebase emulator.
Why use it?
It helps find authorization bypasses, cross-customer data access, privilege increases, unsafe updates, and gaps in rule testing before deployment.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 74repo +1 changed 11d ago A scan SkillSpector: warn 34 tokens original MIT

Good fit Use it to audit new or changed Firebase rules, check data-model changes, and review tests run with the Firebase emulator.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/seaworld008/commonly-used-high-value-skills/firebase-security-rules-auditor
View source ↗ seaworld008/Commonly-used-high-value-skills
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.

Any agent
npx skills add seaworld008/Commonly-used-high-value-skills --skill firebase-security-rules-auditor
Clone the repo
git clone --depth 1 https://github.com/seaworld008/Commonly-used-high-value-skills

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 firebase-security-rules-auditor

README.md
[![agentmods](https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/firebase-security-rules-auditor/github.svg)](https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/firebase-security-rules-auditor)
Your own site
<a href="https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/firebase-security-rules-auditor"><img src="https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/firebase-security-rules-auditor/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 firebase-security-rules-auditor

Your own site · 80×15
<a href="https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/firebase-security-rules-auditor"><img src="https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/firebase-security-rules-auditor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,465 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Prompt Injection · line 82
    Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.
    Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
How audits are shown
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 $0.00034 $0.01465
Opus 5.5 $0.00014 $0.00586
Sonnet 5.5 $0.00007 $0.00293
Haiku 4.5 $0.00003 $0.00146

Measured 11d ago against content hash d42d317c70cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

firebase-security-rules-auditor 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 11d 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.

openclaw-skills/firebase-security-rules-auditor/SKILL.md · 152 lines

How it starts

The opening of the file, as written. The whole thing — 152 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Overview

This skill acts as an auditor for Firebase Security Rules, evaluating them against a rigorous set of criteria to ensure they are secure, robust, and correctly implemented.

Scoring Criteria

Assessment: Security Validator (Red Team Edition)

You are a Senior Security Auditor and Penetration Tester specializing in Firestore. Your goal is to find "the hole in the wall." Do not assume a rule is secure because it looks complex; instead, actively try to find a sequence of operations to bypass it.

Mandatory Audit Checklist:

  1. The Update Bypass: Compare 'create' and 'update' rules. Can a user create a valid document and then 'update' it into an invalid or malicious state (e.g., changing their role, bypassing size limits, or corrupting data types)?
  2. Authority Source: Does the security rely on user-provided data (request.resource.data) for sensitive fields like 'role', 'isAdmin', or 'ownerId'? Carefully consider the source for that authority.
  3. Business Logic vs. Rules: Does the rule set actually support the app's purpose? (e.g., In a collaboration app, can collaborators actually read the data? If not, the rules are "broken" or will force insecure workarounds).
  4. Storage Abuse: Are there string length or array size limits? If not, label it as a "Resource Exhaustion/DoS" risk.
  5. Type Safety: Are fields checked with 'is string', 'is int', or 'is timestamp'?
  6. Field-Level vs. Identity-Level Security: Be careful with rules that use hasOnly() or diff(). While these restrict which fields can be updated, they do NOT restrict who can update them unless an ownership check (e.g., resource.data.uid == request.auth.uid) is also present. If a rule allows any authenticated user to update fields on another user's document without a corresponding ownership check, it is a data integrity vulnerability.

Admin Bootstrapping & Privileges:

The admin bootstrapping process is limited in this app. If the rules use a single hardcoded admin email (e.g., checking request.auth.token.email == '[email protected]'), this should NOT count against the score as long as:

Read the full file on GitHub · 152 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 11d ago Changed d42d317c70cf
  2. 1mo ago Changed · +11 lines e389e5c312b2
  3. 2mo ago Changed · -34 tokens per session de6dfa3b8dbe
  4. 2mo ago First seen · 141 lines · 68 tokens per session scan A 91b3a59f6e98

Subscribe to this mod's changes

firebase-security-rules-auditor is a skill published in the GitHub repository seaworld008/Commonly-used-high-value-skills (74 stars, last pushed 2d ago), licensed MIT. It adds 34 tokens to every session and 1,465 once invoked, about $0.0001 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 2026-09-03.

Claude CodeDatabasesSecurityagentaiai-toolsautomationcodex
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