Firebase Auth Basics

Firebase-auth-basics provides developers with guidance on setting up and implementing Firebase Authentication for applications that require user sign-in, account management, or secure data access. The skill covers core concepts including user properties, multiple identity provider options (email/password, Google, phone, anonymous, and custom auth), and token-based authentication workflows. It solves the problem of securely authenticating users and managing access control through Firebase's backend services and SDKs.

skills.sh installs: 182.2K
GitHub stars: 508
last updated: Aug 21, 2026

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Install

$ npx -y skills add firebase/agent-skills --skill firebase-auth-basics --agent claude-code

Installs into .claude/skills of the current project.

Files

Prerequisites

Firebase Project: Created via npx -y firebase-tools@latest projects:create (see firebase-basics).
Firebase CLI: Installed and logged in (see firebase-basics).

Core Concepts

Firebase Authentication provides backend services, easy-to-use SDKs, and ready-made UI libraries to authenticate users to your app.

Users

A user is an entity that can sign in to your app. Each user is identified by a unique ID (uid) which is guaranteed to be unique across all providers. User properties include:

uid: Unique identifier.
email: User's email address (if available).
displayName: User's display name (if available).
photoURL: URL to user's photo (if available).
emailVerified: Boolean indicating if the email is verified.