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Addition MCP Server

My MCP Server

A simple Model Context Protocol (MCP) server that provides an addition tool for adding two numbers together.

Overview

This MCP server implements a basic arithmetic tool that can add two numbers. It's built using the official MCP SDK and demonstrates how to create a custom MCP server.

Features

  • Addition Tool: Adds two numbers together

  • MCP Protocol: Follows the Model Context Protocol specification

  • Type Safety: Uses Zod for input validation

Installation

  1. Clone or download this repository

  2. Install dependencies:

    npm install

Usage

Running the Server

To run the MCP server:

node mcp.js

The server will start and listen for MCP protocol messages via stdio.

Available Tools

Addition Tool

  • Name: add

  • Description: Add two numbers together

  • Parameters:

    • a (number): First number

    • b (number): Second number

  • Returns: The sum of the two numbers as text

Example Usage

When connected to an MCP client, you can use the addition tool like this:

{ "tool": "add", "parameters": { "a": 5, "b": 3 } }

This would return: 8

Adding to Cursor

To use this MCP server in Cursor, you need to configure it in your Cursor settings:

Method 1: Using Cursor Settings UI

  1. Open Cursor Settings:

    • Press Cmd+, (Mac) or Ctrl+, (Windows/Linux)

    • Or go to Cursor > Preferences > Settings

  2. Navigate to MCP Settings:

    • Search for "MCP" in the settings search bar

    • Click on "Model Context Protocol" settings

  3. Add the Server:

    • Click "Add Server" or the "+" button

    • Configure the server with these settings:

      Name: Addition Server Command: node Args: [path/to/your/mcp.js] Cwd: [path/to/your/project/directory]

Method 2: Using Settings JSON

  1. Open Cursor Settings JSON:

    • Press Cmd+Shift+P (Mac) or Ctrl+Shift+P (Windows/Linux)

    • Type "Preferences: Open Settings (JSON)"

    • Select it

  2. Add MCP Configuration: Add this configuration to your settings JSON:

    { "mcp.servers": { "addition-server": { "command": "node", "args": ["/Users/slav/Documents/dev/first-mcp/mcp.js"], "cwd": "/Users/slav/Documents/dev/first-mcp" } } }

    Important: Replace the paths with your actual project directory path.

  3. Restart Cursor:

    • Close and reopen Cursor for the changes to take effect

Using the Addition Tool in Cursor

Once configured, you can use the addition tool in Cursor by:

  1. Opening a chat with the AI assistant

  2. Asking it to add numbers: "Can you add 15 and 27 for me?"

  3. The AI will use your MCP server to perform the calculation

Troubleshooting

  • Server not found: Make sure the path to mcp.js is correct and the file exists

  • Permission errors: Ensure you have execute permissions on the Node.js binary

  • Dependencies missing: Run npm install in the project directory first

  • Port conflicts: This server uses stdio, so no port conflicts should occur

Development

Project Structure

  • mcp.js - Main server implementation

  • package.json - Node.js project configuration

  • README.md - This file

Dependencies

  • @modelcontextprotocol/sdk - Official MCP SDK

  • zod - Type validation library

License

ISC

-
security - not tested
F
license - not found
-
quality - not tested

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

A simple demonstration MCP server that provides a basic arithmetic tool for adding two numbers together, showcasing how to build custom MCP servers with input validation.

  1. Overview
    1. Features
      1. Installation
        1. Usage
          1. Running the Server
          2. Available Tools
          3. Example Usage
        2. Adding to Cursor
          1. Method 1: Using Cursor Settings UI
          2. Method 2: Using Settings JSON
          3. Using the Addition Tool in Cursor
          4. Troubleshooting
        3. Development
          1. Project Structure
          2. Dependencies
        4. License

          MCP directory API

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