firestore-rules

Automate Firestore security rule design and validation with the A3 helper library.

Updated Mar 24, 2026

Search Tags:#validation #patterns #firebase #firestore #access-control #security-rules #rules-unit-testing

Ready to run

npx skills add https://github.com/trusted-american/marketplace --skill firestore-rules

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: firestore-rules
Source: https://github.com/trusted-american/marketplace/tree/main/plugins/a3-plugin/skills/firestore-rules
Command: npx skills add https://github.com/trusted-american/marketplace --skill firestore-rules

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Firestore rule references and patterns to enforce authentication, ownership, and collection-level access across a multi-collection app using a robust helper library.

Core Features & Use Cases

Centralized rule syntax reference with match statements, reads/writes, and collection-group patterns.
Reusable helper functions for authentication, ownership, and role-based checks, plus cross-document validation patterns.
Real-world examples for clients, enrollments, notes, and files with guidance on testing via emulator.

Quick Start

Integrate A3 Firestore rules reference into your project and start enforcing authentication, ownership, and collection-level permissions today.

Frequently Asked Questions about firestore-rules

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I write Firestore security rules for nested collections?▼

Firestore security rules for nested collections use structured match statements to enforce authentication and ownership across parent-child structures like clients and enrollments. Reusable helper functions manage access controls and cross-document validations.

What is the best way to validate Firestore rules using an emulator?▼

Validating Firestore rules with an emulator involves running rules unit testing against your defined match statements. This approach tests request and resource semantics, plus data validation patterns, to ensure access controls function correctly before deployment.

How do I use get() and exists() for cross-document validation in Firebase?▼

Cross-document validation in Firebase uses get() and exists() functions within Firestore rules to check permissions in other collections. This ensures role-based access and ownership checks pass before allowing reads or writes on the target document.

Can I enforce role-based access control in Firestore security rules?▼

You can enforce role-based access control in Firestore security rules by applying reusable helper functions. These functions evaluate authentication state, ownership, and user roles to determine permissions for collection-level reads and writes.

What are request and resource semantics in Firestore rules?▼

Request and resource semantics in Firestore rules represent the incoming data and the existing document state during evaluation. They are used within match statements to apply data validation patterns and ownership checks before authorizing writes.