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licenseC
qualityD
maintenanceA server that provides tools for performing basic arithmetic operations (addition, subtraction, multiplication, division) via the Model Context Protocol.
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Calculator MCP Server
by souravjai
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@Calculator MCP ServerWhat's 20 divided by 4?"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
Calculator MCP Server
A small Model Context Protocol (MCP) server that exposes basic calculator operations over stdio.
Features
The server provides these tools:
Tool | Description | Arguments |
| Adds two numbers |
|
| Subtracts the second number from the first |
|
| Multiplies two numbers |
|
| Divides the first number by the second |
|
All arguments must be numbers. div returns an error when op2 is 0.
Related MCP server: Math MCP Server
Requirements
Node.js 18 or later
npm
Setup
Install the dependencies from this directory:
npm installRun the server
Start the MCP server over stdio:
npm startThe server waits for an MCP client to connect, so it does not print normal application output to the terminal.
Test with the example client
The example client starts the server, lists its tools, and calls div with 10 and 0 to demonstrate the division-by-zero error:
npm run test-clientTo test a successful operation, update the callTool arguments in mcp-client-test.ts, for example:
arguments: { op1: 10, op2: 2 },Use MCP Inspector
Run the interactive MCP Inspector with:
npm run mcp-inspectOpen the URL printed by the command, then select a calculator tool and provide values for op1 and op2.
Project files
mcp-server.ts- MCP server and calculator tool definitionsmcp-client-test.ts- example MCP clientmcp-calculator.gif- tutorial walkthroughpackage.json- scripts and dependencies
This server cannot be deployed
Maintenance
ActivityMaintained
ResponsivenessNo issues
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