A
licenseC
qualityD
maintenanceA Model Context Protocol server that enables LLMs to perform precise numerical calculations by evaluating mathematical expressions.
1
157
MIT
mcp-calculator
by Arunyaiitm
Provides tools for arithmetic operations (add, subtract, multiply, divide, power, sqrt) powered by an Ollama AI model that understands natural language math queries.
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., "@mcp-calculatorWhat is 12 * 15?"
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.
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 qwen3:4bSetup
# Install dependencies
npm installRun
# Interactive chat
npm run devThen 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 two numbers | 3 + 5 |
| Subtract second from first | 10 - 4 |
| Multiply two numbers | 6 * 7 |
| Divide first by second | 20 / 4 |
| Raise number to a power | 2^8 |
| 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 devIntegrate 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.jsonLicense
MIT
This server cannot be deployed
Maintenance
ActivitySlowing
ResponsivenessNo issues
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