cymbal-air-toolbox-demo

[!NOTE] This project is for demonstration only and is not an officially supported Google product.

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Introduction

This project provides a production-quality reference implementation for building Agentic applications that use Agents and Retrieval Augmented Generation (RAG) to query and interact with data stored in Google Cloud Databases.

This demonstration features Cymbal Air, a fictional airline. The application showcases a customer service assistant that helps travelers manage flights and find information about San Francisco International Airport (SFO), Cymbal Air’s hub. The agent can answer questions like:

• Are there any luxury shops in the terminal?
• Where can I get coffee near gate A6?
• I need to find a gift for my colleague.
• What flights are headed to NYC tomorrow?

Table of Contents

• Understanding the demo
  • Retrieval Augmented Generation RAG
  • Agent-based Orchestration
  • Architecture
• Deployment
  • Before you begin
  • One-Time Database & Tool Configuration
  • Launch the Toolbox Server Choose One
  • Running the Agentic Application
  • Clean Up
• Customizing Your Tools

Understanding the demo

Retrieval Augmented Generation (RAG)

One of the best tools for reducing hallucinations is to use Retrieval Augmented Generation (RAG). RAG is the concept of retrieving some data or information, augmenting your prompt to the agent, and allowing it to generate more accurate responses based on the data included in the prompt. This grounds the model’s response, making it less likely to hallucinate. This technique is also useful for allowing the agent to access data it didn’t have when it was trained. And unlike fine-tuning, the information retrieved for RAG does not alter the model or otherwise leave the context of the request - making it more suitable for use cases where information privacy and security are important.

Cloud databases provide a managed solution for storing and accessing data in a scalable and a reliable way. By connecting an agent to a cloud database, developers can give their applications access to a wider range of information and reduce the risk of hallucinations.

Agent-based Orchestration

This application uses an Agent-based orchestration model. Instead of a static chain of calls, the LLM acts as an intelligent Agent that decides which tools to use and in what order. It is given a set of available tools, each with a specific function (e.g., find_flights, list_amenities). Based on the user’s query, the agent reasons about the best tool to use to find the answer. This “thought process” allows the agent to handle a wider variety of queries and to break down complex questions into smaller, manageable steps.

Architecture

The architecture consists of three main components:

1. Application – The user-facing agentic app that orchestrates the interaction between the user and the agent.
2. MCP Toolbox – MCP Toolbox is a middleware server that exposes the database operations as a set of tools. The LLM agent connects to the Toolbox to execute these tools. This provides a secure, scalable, and modular way to manage database interactions.
3. Database – The database containing the data the agent can use to answer questions. For this application, the database used was intentionally designed to be interchangeable in order to make it easier to run this on your preferred database.

Using the Toolbox as an intermediary offers several advantages:

1. Better Security - The Toolbox handles authentication and authorization, preventing the agent from directly accessing the database and reducing the risk of security vulnerabilities.
2. Better scalability - Toolbox allows multiple different Agents to leverage it, as well as allowing it to scale independently. It allows for production best practices such as connection pooling or caching.
3. Better recall - Agents perform better when given smaller, discrete tasks they can use to accomplish larger goals. By mapping a specific action to a specific, pre-determined query, via tools, it significantly improves the agent’s ability to leverage it successfully.

Head over to the official MCP Toolbox docs for more details.

Deployment

Deploying Cymbal Air app is a three-step process. You will first download the necessary tools, then perform a one-time setup for your database and Toolbox configuration, and finally launch the Toolbox server and the app.

Before you begin

First, clone this repository and download the MCP Toolbox binary.

1. Clone the repository:

   git clone https://github.com/GoogleCloudPlatform/cymbal-air-toolbox-demo.git
   cd cymbal-air-toolbox-demo
   

2. Download MCP Toolbox binary:

   Follow these steps to download the binary. This involves running the following commands:

   # See the releases page for the latest version
   export VERSION=0.8.0
   curl -O https://storage.googleapis.com/genai-toolbox/v$VERSION/linux/amd64/toolbox
   chmod +x toolbox
   

One-Time Database & Tool Configuration

Next, you must perform a one-time setup to create your database instance, populate it with data, and create the tools.yaml configuration file. This process uses the Toolbox binary you just downloaded.

[!IMPORTANT] For detailed, step-by-step instructions, follow the Database Setup Guide.

Launch the Toolbox Server (Choose One)

After your database is initialized and your tools.yaml file is created, you must run the Toolbox server so the agentic app can connect to it. You can either run it locally for development or deploy it to Cloud Run for a more robust setup.

Option A: Run Toolbox Locally

For local development and testing, you can run the Toolbox server directly from your terminal. This is the quickest way to get started.

For instructions, follow the guide to running the Toolbox locally.

The basic command will be:

./toolbox --tools-file "tools.yaml"

Option B: Deploy Toolbox to Cloud Run

For a scalable and production-ready setup, you can deploy the Toolbox as a service on Google Cloud Run. This provides a stable, shareable endpoint for your application.

For instructions, follow the guide to deploying the Toolbox on Cloud Run.

Running the Agentic Application

Instructions for running app locally

Clean Up

Instructions for cleaning up resources

Customizing Your Tools

This demo can serve as a starting point for building your own Agentic applications. You can customize the tools available to the agent by modifying the MCP Toolbox configuration file.

Please refer to the MCP Toolbox documentation for more information on creating and configuring tools.