Arithmuse

Arithmuse

A minimal Python-based MCP server that provides standard arithmetic tools including addition, subtraction, multiplication, and division. It allows language models to perform basic mathematical calculations through a standardized interface.

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Arithmuse

Arithmuse is a minimal Python MCP server that provides basic calculator tools:

  • add
  • subtract
  • multiply
  • divide

Requirements

  • Python 3.10+

Install

python -m venv .venv
source .venv/bin/activate
pip install -e ".[dev]"

Run locally

python -m arithmuse.server

By default, this starts Streamable HTTP transport on 0.0.0.0:$PORT (or port 8000) with MCP endpoint at /mcp.

To run with stdio transport instead:

MCP_TRANSPORT=stdio python -m arithmuse.server

Dedalus deployment notes

  • Dedalus entrypoint:
    • python main.py
  • This server uses dedalus_mcp and serves /mcp via server.serve().
  • Optional env var:
    • DEDALUS_SERVER_NAME (default: calculator-mcp; should match your Dedalus slug)
  • Keep the service stateless; no persistent filesystem assumptions are required.
  • Ensure your Dedalus runtime installs project dependencies from pyproject.toml.
  • Health check expectation: process starts successfully, remains running, and responds on /mcp.
  • This repo keeps the arithmuse package at project root so imports work even if the platform does not pip install . first.

Available tools

  • add(a, b) -> a + b
  • subtract(a, b) -> a - b
  • multiply(a, b) -> a * b
  • divide(a, b) -> a / b (returns an error for divide-by-zero)

Test

pytest -q

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