SSE Calculator MCP Server

A stateful calculator server that uses Server-Sent Events (SSE) for real-time communication. This server implements the Model Context Protocol (MCP) for integration with AI assistants.

Features

• Real-time calculator operations using SSE

• Stateful sessions for ongoing calculations

• History tracking for all calculations

• Web-based calculator interface

• MCP integration for AI assistants

Architecture

The server is built using NestJS and implements the following components:

• Session Service: Manages calculator sessions and state

• Calculator Service: Performs calculation operations

• SSE Controller: Handles client connections and event streaming

Getting Started

Prerequisites

• Node.js (v14 or higher)

• npm (v6 or higher)

Installation

1. Clone the repository

2. Install dependencies:

npm install

3. Start the server:

npm run start:dev

4. Open the calculator interface in your browser:

http://localhost:3000

API Endpoints

SSE Stream

GET /calculator/stream

Establishes an SSE connection and creates a new calculator session.

Calculate

POST /calculator/calculate/:sessionId

Performs a calculation operation on the specified session.

Request body:

{
  "operation": "add", // add, subtract, multiply, divide, clear
  "a": 5,
  "b": 3
}

History

GET /calculator/history/:sessionId

Retrieves the calculation history for the specified session.

Sessions

GET /calculator/sessions

Retrieves all active calculator sessions.

MCP Integration

To use this server as an MCP server, add the following configuration to your MCP settings file:

{
  "mcpServers": {
    "remote-calculator": {
      "url": "http://localhost:3000/calculator/stream",
      "disabled": false,
      "alwaysAllow": [],
      "timeout": 60
    }
  }
}

Deployment Options

For production deployment, you can use the following options:

1. Docker: A Dockerfile is provided for containerized deployment

   • See Dockerfile and docker-compose.yml for configuration

2. Smithery.ai: Deploy directly from GitHub

   • See SMITHERY_DEPLOYMENT.md for detailed instructions

   • Configuration provided in smithery.json

3. Heroku/DigitalOcean: Cloud platform deployment

   • See DEPLOYMENT.md for step-by-step instructions

4. Self-hosted: Use NGINX or similar for SSL termination and load balancing

Hosting Your Own MCP Server

After deploying your server, update your MCP client configuration to point to your hosted URL:

{
  "mcpServers": {
    "remote-calculator": {
      "url": "https://your-deployed-url.com/calculator/stream",
      "disabled": false,
      "alwaysAllow": [],
      "timeout": 60
    }
  }
}

License

MIT