MCP Calculator Server
A simple Model Context Protocol (MCP) server that provides calculator functions.
Overview
This MCP server implements basic arithmetic operations as tools that can be called by Large Language Models (LLMs) through the Model Context Protocol.
Features
- Addition: Add two numbers together
- Subtraction: Subtract one number from another
- Multiplication: Multiply two numbers together
- Division: Divide one number by another (with validation to prevent division by zero)
Installation
npm installUsage
Running the server
npm run devThis starts the MCP server in development mode with auto-restart on file changes.
For production:
npm startTesting with MCP Inspector
You can test the server using the MCP Inspector:
npx @modelcontextprotocol/inspector node src/index.jsThis will open a web interface where you can:
- View available tools
- Test each calculator function with custom inputs
- See the responses from the server
Available Tools
| Tool | Parameters | Description |
|---|---|---|
| add | a: number, b: number | Adds two numbers |
| subtract | a: number, b: number | Subtracts b from a |
| multiply | a: number, b: number | Multiplies two numbers |
| divide | a: number, b: number (non-zero) | Divides a by b |
Example Usage
When connected to an LLM through MCP, the model can call these tools to perform calculations. For example:
- To add 5 and 3, the LLM would call the
addtool with parametersa: 5, b: 3 - To divide 10 by 2, the LLM would call the
dividetool with parametersa: 10, b: 2
License
MIT
