number-tools-mcp

Number Tools MCP

Convert numbers between bases, make roman numerals, and spell out numbers locally. No network, no key.

This file is self contained. It reads public data only and never writes to the machine. All output is bounded and honest about what could not be fetched.

Tools

• convert_base Convert between bases.
• roman Convert to and from roman numerals.
• spell_number Spell a number in words.

Usage

npm install
npm run build
node dist/index.js

All processing happens locally.

Premium tools

These tools need a license key:

• divisors

Buy a key at https://mcp-marketplace.io/server/io-github-mrfentmen-number-tools-mcp and set it in your MCP client config:

"env": { "MCP_LICENSE_KEY": "mcp_live_..." }

The key is checked against MCP Marketplace, cached for 24 hours, and keeps working offline once one check has succeeded. Every other tool on this server stays free.