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mcp-calculator

mcp-calculator

by Arunyaiitm
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

MCP Calculator Agent

A simple calculator powered by the Model Context Protocol (MCP) and Ollama. Ask math questions in plain English and get answers.

What is this?

This project connects an AI model (Ollama) to a set of calculator tools via MCP. The AI understands your question, picks the right tool, and returns the result — all through a simple chat interface.

Related MCP server: Calculator MCP

How it works

You  ──>  Agent  ──>  Ollama (AI)  ──>  MCP Server (tools)
              │             │                    │
              │  send msg   │  pick tool call    │  execute math
              │<────────────│<───────────────────│
              │  get answer │  return result     │
              │<────────────│<───────────────────│

  • MCP Server — exposes 6 calculator tools (add, subtract, multiply, divide, power, sqrt)

  • Agent — middleman that connects Ollama to the MCP server and runs the chat loop

  • Ollama — the AI brain that reads your question and decides which tool to use

Prerequisites

# Pull a model
ollama pull qwen3:4b

Setup

# Install dependencies
npm install

Run

# Interactive chat
npm run dev

Then ask things like:

What is 12 * 15?
What's the square root of 144?
Calculate (3 + 7) * 2
What is 2 to the power of 10?

Type quit or exit to stop.

Available Tools

Tool

Description

Example

add

Add two numbers

3 + 5

subtract

Subtract second from first

10 - 4

multiply

Multiply two numbers

6 * 7

divide

Divide first by second

20 / 4

power

Raise number to a power

2^8

sqrt

Square root of a number

sqrt(144)

Use a different model

Set the OLLAMA_MODEL environment variable:

OLLAMA_MODEL=qwen2.5-coder:3b npm run dev

Integrate with OpenCode

Add this to opencode.jsonc in your project root:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "calculator": {
      "type": "local",
      "command": ["npx", "tsx", "src/server-runner.ts"],
      "cwd": "."
    }
  }
}

Project structure

mcp-calculator/
├── src/
│   ├── server.ts         # MCP server with calculator tools
│   ├── server-runner.ts  # Entry point for the MCP server
│   ├── agent.ts          # Agent connecting Ollama to MCP
│   ├── index.ts          # Interactive REPL
│   └── test.ts           # Quick end-to-end test
├── package.json
└── tsconfig.json

License

MIT

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

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    Maintenance

    ActivityInactive
    ResponsivenessNo recent community issues

    Resources

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