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 Claude can actually read the document

- exact math and unit conversions (90 km/h to m/s, that kind of thing)

- timezone conversion with real IANA zones

- image convert / resize / compress / crop / watermark

- pdf merge / split / rotate

- QR codes, hmac, bcrypt, regex extract, text diff, json/csv

setup is one line in your config: { "command": "npx", "args": ["-y", "toolbox-mcp"] }

works in Claude Desktop and Claude Code (also Cursor, VS Code, Antigravity). i have it connected in Claude Code right now and it just calls the tools directly.

repo: https://github.com/medoxisto/toolbox-mcp its open source (MIT), free, would love feedback or tool ideas. what deterministic stuff do you wish Claude would stop guessing at?

Update: yo u/ClaudeOfficial heard u guys give out 6 months of free max for open source stuff. bro i basically just spent days fixing ur AIs blind spots and skill issues (mans cant read a pdf, do crypto, or process data without lying to me). does babysitting claude count? hook a brother up pls lmaoo