adk-mcp-demo

c0dyhi11/adk-mcp-demo

3.2

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This repository demonstrates the integration between Google's Agent Development Kit (ADK) and a FastMCP server.

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ADK and FastMCP Integration Demo

This repository contains a demonstration project showcasing the integration between the Google's Agent Development Kit (ADK) and a FastMCP (Fast Multi-Capability Proxy) server.

The project consists of two main components:

  1. A FastMCP server that exposes several tools via an HTTP endpoint.
  2. An ADK agent that connects to the MCP server to use its tools to perform a series of tasks based on user interaction.

Overview

The goal of this demo is to illustrate how an ADK agent can leverage external tools hosted on a FastMCP server.

The MCP Server

Located in the mcp_server/ directory, the server is built using the fastmcp library. It automatically discovers and registers any tools placed within the mcp_server/tools/ directory.

The following tools are included:

  • generate_random_number(max_number: int) -> int: Returns a random integer between 1 and max_number.
  • is_prime(n: int) -> bool: Checks if a given integer n is a prime number.
  • calculate_pi_to_digits(digits: int) -> str: Calculates the value of Pi to a specified number of decimal digits.

The ADK Agent

Located in agents/mcp_demo/, the Random_Prime_Number_Pi_Calculating_Agent is an LlmAgent configured to use a Gemini model. It has a quirky personality, speaking in 1990's hip-hop slang.

The agent follows this logic:

  1. It asks the user for a positive integer.
  2. It uses the generate_random_number tool with the user's number as the maximum value.
  3. If the random number is 10 or less, it tells the user the number and playfully suggests they aren't "nerdy enough" if they need a tool to calculate Pi to so few digits. The interaction then waits for a new number from the user.
  4. If the random number is greater than 10, it uses the is_prime tool to check for primality.
  5. If the number is not prime, it informs the user and loops back to generate a new random number.
  6. If the number is prime, it uses the calculate_pi_to_digits tool to calculate Pi to that many digits. It then presents the prime number and the calculated value of Pi to the user, completing the loop.

Getting Started

Follow these instructions to set up and run the demo.

Prerequisites

  • Python 3.8 or higher
  • pip (Python package installer)

Installation

  1. Clone the repository:

    git clone https://github.com/c0dyhi11/adk-mcp-demo.git
cd adk-mcp-demo

  2. Set up a virtual environment (recommended):

    python3 -m venv venv
source venv/bin/activate
# On Windows, use: venv\Scripts\activate

  3. Install the required dependencies: This project depends on google-adk and fastmcp which are in the included requirements.txt.

    pip install -r requirements.txt

How to Run the Demo

The demo requires two separate processes running in two different terminals: the MCP server and the ADK agent.

Step 1: Start the MCP Server

In your first terminal, run the MCP server from the root of the project directory.

python mcp_server/main.py

You should see output indicating the server has started and has discovered the tools:

Discovered and loaded tool package: tools.calc_pi
Discovered and loaded tool package: tools.is_prime
Discovered and loaded tool package: tools.random_num
INFO:     Started server process [XXXXX]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://0.0.0.0:9000 (Press CTRL+C to quit)

You can optionally verify the server is working by running the test script in a separate terminal:

python mcp_server/test_fastmcp_server.py

It should output something like this:

[Tool(name='calculate_pi_to_digits', title=None, description='Calculates Pi to a given number of digits.', inputSchema={'properties': {'digits': {'type': 'integer'}}, 'required': ['digits'], 'type': 'object'}, outputSchema={'properties': {'result': {'type': 'string'}}, 'required': ['result'], 'type': 'object', 'x-fastmcp-wrap-result': True}, icons=None, annotations=None, meta={'_fastmcp': {'tags': []}}), Tool(name='is_prime', title=None, description='Checks if a number is prime.', inputSchema={'properties': {'n': {'type': 'integer'}}, 'required': ['n'], 'type': 'object'}, outputSchema={'properties': {'result': {'type': 'boolean'}}, 'required': ['result'], 'type': 'object', 'x-fastmcp-wrap-result': True}, icons=None, annotations=None, meta={'_fastmcp': {'tags': []}}), Tool(name='generate_random_number', title=None, description='Returns a random number between 1 and max_number.', inputSchema={'properties': {'max_number': {'default': 100, 'type': 'integer'}}, 'type': 'object'}, outputSchema={'properties': {'result': {'type': 'integer'}}, 'required': ['result'], 'type': 'object', 'x-fastmcp-wrap-result': True}, icons=None, annotations=None, meta={'_fastmcp': {'tags': []}})]

Step 2: Run the ADK Agent

You'll need to create a .env file in the agents/mcp_demo/ directory with your environment configuration, you can use this with either Google Cloud's Vertex AI or Google AI Studio:

For Google Cloud Vertex AI

Your .env will need to look like this:

GOOGLE_GENAI_USE_VERTEXAI=1
GOOGLE_CLOUD_PROJECT=<your-project-id>
GOOGLE_CLOUD_LOCATION=us-central1

For Google Cloud Vertex AI, you will also need to authenticate your environment. This requires the gcloud CLI. Install the gcloud CLI by following the instructions here

Configure your GCP project:
gcloud config set project <your_project_id>
gcloud auth application-default login
For Google AI Studio

Your .env file should look like this:

GOOGLE_GENAI_USE_VERTEXAI=0
GOOGLE_API_KEY=<your_api_key>

In a second terminal (ensure your virtual environment is active), use the adk command-line tool to run the agent.

cd agents
adk web

You should see output indicating the server has started something like this:

INFO:     Started server process [XXXXX]
INFO:     Waiting for application startup.

+-----------------------------------------------------------------------------+
| ADK Web Server started                                                      |
|                                                                             |
| For local testing, access at http://127.0.0.1:8000.                         |
+-----------------------------------------------------------------------------+

INFO:     Application startup complete.
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)

Step 3: Interact with the Agent in the web ui

In your web browser navigate to http://127.0.0.1:8000 and start chatting with the agent using the ADK web ui.