MCP Calculator Server

This project is a simple Model Context Protocol (MCP) server that evaluates mathematical expressions sent by MCP clients. It can be used with the official MCP Python client or the VSCode MCP extension.

Features

Evaluate math expressions using Python's math module (e.g., sqrt(25) + 2**3).
Secure evaluation: only math functions/constants are available.
Exposes a calculate tool via the MCP protocol.
Compatible with the Model Context Protocol VSCode extension.

Related MCP server: Calculator MCP

Setup

Clone the repository and enter the directory:
git clone <your-repo-url> cd calculator-mcp
Create and activate a virtual environment (recommended):
python3 -m venv venv source venv/bin/activate
Install dependencies:
pip install -r requirements.txt

Running the MCP Server

Start the server (by default, it listens on all interfaces at port 8500, root path):

python app.py

You should see:

MCP server running on 0.0.0.0:8500 (root path)

Using the Python Client

The provided client.py can be used to test the server:

python client.py

This will send the expression sqrt(25) + 2**3 to the server and print the result.

You can modify client.py to send other expressions.

Using the MCP Server in VSCode

Install the MCP Extension:
- Open VSCode.
- Go to Extensions (Ctrl+Shift+X or Cmd+Shift+X).
- Search for Model Context Protocol or MCP and install the official extension.
Start the MCP server:
- Make sure python app.py is running.
Connect VSCode to the MCP Server:
- Open the Command Palette (Ctrl+Shift+P or Cmd+Shift+P).
- Type MCP: Add Server or MCP: Connect to Server.
- Enter the server URL:
  http://127.0.0.1:8500/
- Give it a name (e.g., "Calculator MCP").
Use the MCP Tools in VSCode:
- Open the MCP sidebar (look for the MCP icon).
- Select your server.
- You should see the calculate tool.
- Run the tool, enter a math expression, and see the result in VSCode.