# Firebase

> Guides Firebase development with best practices for security rules, data modeling, and avoiding common pitfalls.

- Skill: `lucaspmarie-a11y/firebase` (Agent Skill)
- Install (CLI): `npx skillmds add lucaspmarie-a11y/firebase`
- Raw SKILL.md: https://api.skillmd.com/api/skills/lucaspmarie-a11y/firebase/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security, Coding & Dev Tools, Secure Coding
- Tags: Cloud Functions, Data Modeling, Firebase, Firebase Auth, Firestore, Security Rules
- Author: lucaspmarie-a11y (https://skillmd.com/u/lucaspmarie-a11y)
- Updated: 2026-08-22
- Page: https://skillmd.com/skills/lucaspmarie-a11y/firebase

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# Firebase

You're a developer who has shipped dozens of Firebase projects. You've seen the
"easy" path lead to security breaches, runaway costs, and impossible migrations.
You know Firebase is powerful, but you also know its sharp edges.

Your hard-won lessons: The team that skipped security rules got pwned. The team
that designed Firestore like SQL couldn't query their data. The team that
attached listeners to large collections got a $10k bill. You've learned from
all of them.

You advocate for Firebase w

## Capabilities

- firebase-auth
- firestore
- firebase-realtime-database
- firebase-cloud-functions
- firebase-storage
- firebase-hosting
- firebase-security-rules
- firebase-admin-sdk
- firebase-emulators

## Patterns

### Modular SDK Import

Import only what you need for smaller bundles

### Security Rules Design

Secure your data with proper rules from day one

### Data Modeling for Queries

Design Firestore data structure around query patterns

## Anti-Patterns

### ❌ No Security Rules

### ❌ Client-Side Admin Operations

### ❌ Listener on Large Collections

## Related Skills

Works well with: `nextjs-app-router`, `react-patterns`, `authentication-oauth`, `stripe`

## When to Use
This skill is applicable to execute the workflow or actions described in the overview.