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sdewanshu-lab

Calculator MCP Server

by sdewanshu-lab
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JavaScript
Remote

Calculator MCP Server

A simple Model Context Protocol (MCP) server built in Node.js that provides some basic arithmetic calculation tools.The srver uses official MCP JavaScript SDK, Zod for input validation and Standard Input/Output (stdio to communicate with MCP clients.

Features:

  • Addition of two numbers

  • Subtraction of one number from another

  • Multiplication of two numbers

  • Division of a number by another number with handling of divide by zero error

  • Percentage calculation

Technologies used:

  • JavaScript ES Module

  • Node.js

  • Model Context Protocol (MCP)

  • MCP JavaScript SDK

  • Zod

Tools Available:

Name

Description

Example

Add

Adds two numbers and returns their sum

a = 2, b = 3, result = 5

Subtract

Subtracts the second number from the first and returns the difference

a = 10, b = 5, result = 5 a = 5, b = 8, result = -3

Multiply

Multiplies two numbers and returns their product

a = 4, b = 3, result = 12

Divide

Divides the first number by the second and returns the quotient

a = 4, b = 2 result = 2 a = 5, b = 2, result = 2.5 a = 6, b = 0, result = Division by zero is not allowed

Percentage

Calculates a specified percent of a given number

value is 500 percent is 20 result is 100

Note Add, Subtract, Multiply and Divide take a and b as input, while Percentage takes Value and Percent as inputs.

Project Folder Structure:

calculator-mcp-server
├── src
│   ├── server
│   │   └── calculatorServer.js
│   ├── tools
│   │   ├── addition.js
│   │   ├── division.js
│   │   ├── multiplication.js
│   │   ├── percentage.js
│   │   └── subtraction.js
│   └── index.js
├── .gitignore
├── LICENSE
├── README.md
├── package-lock.json
└── package.json

Prerequisites:

  1. Node.js Version: v24.11.1

  2. npm Version: v11.6.2

Install dependencies:

Clone repository using https://github.com/sdewanshu-lab/calculator-mcp-server.git

  1. npm install

Run Server:

  1. npm run start

Testing:

Launch MCP Inspector via npx @modelcontextprotocol/inspector This will open MCP Inspector in browser or give an URL. Copy that URL and paste it in browser.

Server Settings:

Setting

Value

Transport

stdio

Command

node

Arguments

src/index.js

Directory

Project Root Diroctory

Note After configuring the server, connect it and open Tools. Select the desired tool from the list and perform the calculations. Examples are provided in Tools Available section.

Version

1.0.0

More functionalities are yet to be added and new versions are to be released.

Author

Dewanshu Sharma

This server cannot be deployed

Shareable, User-Owned Context BackendPeople, applications, and agents read, write, and coordinate together in one context lake. Reach it over MCP, a CLI, a Python SDK, or REST.fulcradynamics.comAd

Maintenance

ActivityMaintained
ResponsivenessNo issues

Resources

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