firebase-ai-logic-basics

SKILL.md

Firebase AI Logic Basics

Overview

Firebase AI Logic is a product of Firebase that allows developers to add gen AI
to their mobile and web apps using client-side SDKs. You can call Gemini models
directly from your app without managing a dedicated backend. Firebase AI Logic,
which was previously known as "Vertex AI for Firebase", represents the evolution
of Google's AI integration platform for mobile and web developers.

It supports the two Gemini API providers:

Gemini Developer API: It has a free tier ideal for prototyping, and
pay-as-you-go for production

Vertex AI Gemini API: Ideal for scale with enterprise-grade production
readiness, requires Blaze plan

Use the Gemini Developer API as a default, and only Vertex AI Gemini API if the
application requires it.
Setup & Initialization

Prerequisites

Before starting, ensure you have Node.js 16+ and npm installed. Install
them if they aren’t already available.

Identify the platform the user is interested in building on prior to starting:
Android, iOS, Flutter or Web.

If their platform is unsupported, Direct the user to Firebase Docs to learn
how to set up AI Logic for their application (share this link with the user
https://firebase.google.com/docs/ai-logic/get-started)

Installation

The library is part of the standard Firebase Web SDK.

npm install -g firebase@latest

If you're in a firebase directory (with a firebase.json) the currently selected
project will be marked with "current" using this command:

npx -y firebase-tools@latest projects:list

Ensure there's at least one app associated with the current project

npx -y firebase-tools@latest apps:list

Initialize AI logic SDK with the init command

npx -y firebase-tools@latest init ailogic

This will automatically enable the Gemini Developer API in the Firebase console.

More info in
Firebase AI Logic Getting Started

Core Capabilities

[!WARNING] CRITICAL: Use current model names: Always check the
Firebase AI Logic Models documentation
for the currently supported model names. Do NOT use gemini-2.0-pro or
gemini-2.0-flash or other older models that are shutdown.

Text-Only Generation

Multimodal (Text + Images/Audio/Video/PDF input)

Firebase AI Logic allows Gemini models to analyze image files directly from your
app. This enables features like creating captions, answering questions about
images, detecting objects, and categorizing images. Beyond images, Gemini can
analyze other media types like audio, video, and PDFs by passing them as inline
data with their MIME type. For files larger than 20 megabytes (which can cause
HTTP 413 errors as inline data), store them in Cloud Storage for Firebase and
pass their URLs to the Gemini Developer API.

Chat Session (Multi-turn)

Maintain history automatically using startChat.

Streaming Responses

To improve the user experience by showing partial results as they arrive (like a
typing effect), use generateContentStream instead of generateContent for
faster display of results.

Generate Images with Nano Banana

[!WARNING] Use current Image model names: Always check the
Firebase AI Logic Models documentation
for the currently supported image generation (Nano Banana) model names.

Requires an upgraded Blaze pay-as-you-go billing plan.

Search Grounding with the built in googleSearch tool

Supported Platforms and Frameworks

Supported Platforms and Frameworks include Kotlin and Java for Android, Swift
for iOS, JavaScript for web apps, Dart for Flutter, and C Sharp for Unity.

Advanced Features

Structured Output (JSON)

Enforce a specific JSON schema for the response.

On-Device AI (Hybrid)

Hybrid on-device inference for web apps, where the Firebase Javascript SDK
automatically checks for Gemini Nano's availability (after installation) and
switches between on-device or cloud-hosted prompt execution. This requires
specific steps to enable model usage in the Chrome browser, more info in the
hybrid-on-device-inference documentation.

Security & Production

App Check

[!WARNING] Critical Safety Requirement: In order to use AI Logic safely,
you MUST set up App Check on your app. This prevents unauthorized clients from
using your API quota and accessing your backend resources.

See
App Check with reCAPTCHA Enterprise
for setup instructions.

Remote Config

Consider that you do not need to hardcode model names (e.g., a specific model
version string). Use Firebase Remote Config to update model versions dynamically
without deploying new client code. See
Changing model names remotely

[!WARNING] CRITICAL: Backend Provisioning Required For all platforms
(Flutter, Android, iOS, Web), you MUST run npx firebase-tools init ailogic
to provision the service. flutterfire configure ONLY handles client
configuration and does NOT enable the AI service, leading to
PERMISSION_DENIED errors.

Initialization Code References

Language, Framework, Platform
Gemini API provider
Context URL

Web Modular API
Gemini Developer API (Developer API)
firebase://docs/ai-logic/get-started

iOS (Swift)
Gemini Developer API
ios_setup.md

Flutter (Dart)
Gemini Developer API
flutter_setup.md

[!WARNING] CRITICAL: Use current model names: Always check the
Firebase AI Logic Models documentation
for the currently supported model names. Do NOT use gemini-2.0-pro or
gemini-2.0-flash or other older models that are shutdown.

References

Web SDK code examples and usage patterns
iOS SDK code examples and usage patterns
Flutter SDK code examples and usage patterns

Android (Kotlin) SDK usage patterns
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