Calculator for Claude Code

io.github.slettmayer/calc-mcp-server

Exact arithmetic: one calculator tool over an AST allowlist, with integers exact at any size.

client:Claude Code transport:stdio runtime:pypi

Install Calculator in Claude Code

run in your project directory

claude mcp add calc-mcp-server -- uvx calc-mcp-server

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs