cal-mcp

A lightweight MCP server for mathematical expression calculation, enabling AI models to perform calculations via MCP.

• Source: GitHub Repository
• Category: Data Analysis & Exploration MCP Servers
• Tags: calculation, mathematics, mcp, open-source, ai-integration
• License: MIT

Features

• Mathematical Expression Calculation: Parses and computes mathematical expressions input by the user.
• Built-in Constants:
  • E: Mathematical constant Math.E from the Bun environment
  • PI: Mathematical constant Math.PI from the Bun environment
  • true: Boolean true
  • false: Boolean false
• Expression Examples:
  • Basic operations: 2 + 2 → 4
  • Using constants: PI * 2 → 6.283185307179586
  • Complex expressions: E ^ 2 + 1 → 8.38905609893065
• Interaction via stdio: The service communicates through standard input/output.
• Lightweight and Efficient: Designed as a simple tool for calculation, using the Bun runtime for efficiency.
• Parameter Handling: Accepts a string mathematical expression as input parameter (exp).
• Dependency on FastMCP and expr-eval: Utilizes these libraries for MCP service construction and math expression evaluation.
• Parameter Validation: Uses zod for validating input parameters.
• Installation Options:
  • Installable via Smithery CLI for Claude Desktop
  • Manual installation with Bun
• Open Source: Source code is available under the MIT license.

Requirements

• Bun Runtime: Requires Bun (latest version recommended).

Usage

• Start the service with bun run index.ts, then send mathematical expressions via stdio to receive results.

Pricing

• Open Source: cal-mcp is free to use under the MIT license. No paid plans are mentioned.