i built an MCP server that gives Claude 35 local tools for the stuff it keeps getting wrong

so i kept noticing Claude is amazing at reasoning but quietly wrong at little deterministic things. arithmetic on big numbers, timezone math, reading a PDF it cant open, generating a QR code, hashing a password. stuff where you want the exact answer, not a confident guess. so i built an MCP server that just hands those jobs to real functions. its called toolbox-mcp, 35 tools, all running locally on your machine. no network, nothing leaves your computer. some of the tools: read the text out of a PDF so Claud