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firebase-auth-basics

Guide for setting up and using Firebase Authentication. Use this skill when the user's app requires user sign-in, user management, or secure data access using auth rules.

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Overview

Guide for setting up and using Firebase Authentication. Use this skill when the user's app requires user sign-in, user management, or secure data access using auth rules.

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Source documentation, not instructions for this website. Review permissions before running any commands.

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.

Identity Providers

Firebase Auth supports multiple ways to sign in:

Email/Password: Basic email and password authentication.
Federated Identity Providers: Google, Facebook, Twitter, GitHub, Microsoft, Apple, etc.
Phone Number: SMS-based authentication.
Anonymous: Temporary guest accounts that can be linked to permanent accounts later.
Custom Auth: Integrate with your existing auth system.

Google Sign In is recommended as a good and secure default provider.

Tokens

When a user signs in, they receive an ID Token (JWT). This token is used to identify the user when making requests to Firebase services (Realtime Database, Cloud Storage, Firestore) or your own backend.

ID Token: Short-lived (1 hour), verifies identity.
Refresh Token: Long-lived, used to get new ID tokens.

Workflow

1. Provisioning

Option 1. Enabling Authentication via CLI

Only Google Sign In, anonymous auth, and email/password auth can be enabled via CLI. For other providers, use the Firebase Console.

Configure Firebase Authentication in firebase.json by adding an 'auth' block:

{
  "auth": {
  "authorizedDomains": ["localhost"],
    "providers": {
      "anonymous": true,
      "emailPassword": true,
      "googleSignIn": {
        "oAuthBrandDisplayName": "Your Brand Name",
        "supportEmail": "support@example.com"
      }
    }
  }
}

[!NOTE] If the Google Sign-In popup opens and immediately closes with the error [firebase_auth/unauthorized-domain], it means the domain is not authorized. For local development, ensure localhost is included in the Authorized Domains list in the Firebase Console or via the authorizedDomains field in firebase.json. CRITICAL: Do NOT include the protocol or port number in the Authorized Domains list (e.g., use localhost, NOT http://localhost:9090).

CRITICAL: After configuring firebase.json, you MUST deploy the auth configuration to the Firebase backend for the changes to take effect. This is essential for auth providers like Google Sign-In, email/password, etc. to auto-generate the necessary OAuth clients for your app platforms. Run:

npx -y firebase-tools@latest deploy --only auth

Option 2. Enabling Authentication in Console

Enable other providers in the Firebase Console.

Go to the https://console.firebase.google.com/project/_/authentication/providers
Select your project.
Enable the desired Sign-in providers (e.g., Email/Password, Google).

2. Client Setup & Usage

Web See references/client_sdk_web.md.

Flutter See references/flutter_setup.md. Android (Kotlin) See references/client_sdk_android.md.

3. Security Rules

Secure your data using request.auth in Firestore/Storage rules.

See references/security_rules.md.

View source ↗

File metadata

name: firebase-auth-basics
description: Guide for setting up and using Firebase Authentication. Use this skill when the user's app requires user sign-in, user management, or secure data access using auth rules.
compatibility: This skill is best used with the Firebase CLI, but does not require it. Firebase CLI can be accessed through `npx -y firebase-tools@latest`.
metadata:
  category: Identity

View original text

---
name: firebase-auth-basics
description: Guide for setting up and using Firebase Authentication. Use this skill when the user's app requires user sign-in, user management, or secure data access using auth rules.
compatibility: This skill is best used with the Firebase CLI, but does not require it. Firebase CLI can be accessed through `npx -y firebase-tools@latest`.
metadata:
  category: Identity
---

## 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.

### Identity Providers

Firebase Auth supports multiple ways to sign in:

- **Email/Password**: Basic email and password authentication.
- **Federated Identity Providers**: Google, Facebook, Twitter, GitHub,
  Microsoft, Apple, etc.
- **Phone Number**: SMS-based authentication.
- **Anonymous**: Temporary guest accounts that can be linked to permanent
  accounts later.
- **Custom Auth**: Integrate with your existing auth system.

Google Sign In is recommended as a good and secure default provider.

### Tokens

When a user signs in, they receive an ID Token (JWT). This token is used to
identify the user when making requests to Firebase services (Realtime Database,
Cloud Storage, Firestore) or your own backend.

- **ID Token**: Short-lived (1 hour), verifies identity.
- **Refresh Token**: Long-lived, used to get new ID tokens.

## Workflow

### 1. Provisioning

#### Option 1. Enabling Authentication via CLI

Only Google Sign In, anonymous auth, and email/password auth can be enabled via
CLI. For other providers, use the Firebase Console.

Configure Firebase Authentication in `firebase.json` by adding an 'auth' block:

```
{
  "auth": {
  "authorizedDomains": ["localhost"],
    "providers": {
      "anonymous": true,
      "emailPassword": true,
      "googleSignIn": {
        "oAuthBrandDisplayName": "Your Brand Name",
        "supportEmail": "support@example.com"
      }
    }
  }
}
```

> [!NOTE] If the Google Sign-In popup opens and immediately closes with the
> error `[firebase_auth/unauthorized-domain]`, it means the domain is not
> authorized. For local development, ensure `localhost` is included in the
> **Authorized Domains** list in the Firebase Console or via the
> `authorizedDomains` field in `firebase.json`. **CRITICAL**: Do NOT include the
> protocol or port number in the Authorized Domains list (e.g., use `localhost`,
> NOT `http://localhost:9090`).

**CRITICAL**: After configuring `firebase.json`, you MUST deploy the auth
configuration to the Firebase backend for the changes to take effect. This is
essential for auth providers like Google Sign-In, email/password, etc. to
auto-generate the necessary OAuth clients for your app platforms. Run:

```bash
npx -y firebase-tools@latest deploy --only auth
```

#### Option 2. Enabling Authentication in Console

Enable other providers in the Firebase Console.

1. Go to the
   https://console.firebase.google.com/project/_/authentication/providers
1. Select your project.
1. Enable the desired Sign-in providers (e.g., Email/Password, Google).

### 2. Client Setup & Usage

**Web** See [references/client_sdk_web.md](references/client_sdk_web.md).

**Flutter** See [references/flutter_setup.md](references/flutter_setup.md).
**Android (Kotlin)** See
[references/client_sdk_android.md](references/client_sdk_android.md).

### 3. Security Rules

Secure your data using `request.auth` in Firestore/Storage rules.

See [references/security_rules.md](references/security_rules.md).

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: Apache-2.0

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
The SKILL.md references other skills (e.g., firebase-basics) without providing links or ensuring they are available, which could cause confusion if used standalone.
Some reference files are truncated in the excerpt, but the provided content appears complete and accurate.
The skill does not explicitly list limitations or edge cases (e.g., handling network failures, token expiration, or multi-factor authentication).
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

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More details

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firebase-auth-basics

Overview

Prerequisites

Core Concepts

Users

Identity Providers

Tokens

Workflow

1. Provisioning

Option 1. Enabling Authentication via CLI

Option 2. Enabling Authentication in Console

2. Client Setup & Usage

3. Security Rules

Review the source

Source & usage notes

Agent access

For the creator

Registry indexed

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Start with one small task

Overview

Prerequisites

Core Concepts

Users

Identity Providers

Tokens

Workflow

1. Provisioning

Option 1. Enabling Authentication via CLI

Option 2. Enabling Authentication in Console

2. Client Setup & Usage

3. Security Rules

Review the source

Source & usage notes

Agent access

Related skills

For the creator

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