MCP

This is a sample of a Model Context Protocol (MCP) chatbot application built with Next.js, Python, and Anthropic Claude, deployed using Defang.

This example uses Docker's mcp/time image as a base for the MCP Server (with MCP tools included), but it can be adapted to use any of the Docker MCP images.

How It Works

Service 1 (Web Server with UI)

The web server and UI are built in Next.js (see /service-1/src/app). The web server includes a forwarding action to connect to the MCP Client.

Service 2 (MCP Client and MCP Server)

The MCP Client is written in Python and ran in a venv virtual environment. The MCP server is provided by the Docker mcp/time image. The MCP Server communicates with the MCP Client in a Quart app (i.e. Asynchronous Server Gateway Interface (ASGI) version of Flask) through the stdio transport method, as seen in /service-2/main.py. For more on MCP transport methods, see here.

Here's a breakdown of what happens when a user interacts with the UI:

1. When a user submits a query to the chatbot, the browser sends a request to the Next.js web server.
2. The Next.js web server will forward this request to the MCP Client via a REST endpoint.
3. The MCP Client processes the request by interacting with the Anthropic (Claude) API and tools available through the MCP Server.
4. Once the response is generated, it is sent back to the Next.js web server and displayed to the user in the UI.

Prerequisites

1. Download Defang CLI
2. (Optional) If you are using Defang BYOC authenticate with your cloud provider account
3. (Optional for local development) Docker CLI

Development

To run the application locally, you can use the following command:

docker compose up --build

Configuration

For this sample, you will need to provide the following configuration:

Note that if you are using the 1-click deploy option, you can set these values as secrets in your GitHub repository and the action will automatically deploy them for you.

ANTHROPIC_API_KEY

An API key for accessing the Anthropic Claude API.

defang config set ANTHROPIC_API_KEY

Deployment

[!NOTE] Download Defang CLI

Defang Playground

Deploy your application to the Defang Playground by opening up your terminal and typing:

defang compose up

BYOC

If you want to deploy to your own cloud account, you can use Defang BYOC.

Title: Model Context Protocol (MCP) Chatbot

Short Description: An MCP (Model Context Protocol) chatbot assistant built with Next.js, Python, and Anthropic Claude.

Tags: MCP, Next.js, Python, Quart, Claude, AI, Anthropic, TypeScript, React, JavaScript

Languages: nodejs, python