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tools++

tools++

by Kessler833
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tools++

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An MCP server with 55 small tools that add to the ones Claude already has, so everyday tasks get simpler and take fewer steps: a calculator that doesn't round, a calendar that knows German holidays, CSV and SQLite queries, PDF text, archives, ports, ffmpeg helpers and so on.

I built this because Claude kept doing arithmetic in its head, guessing today's date and writing a new throwaway script every time it had to look at a CSV. Now it just calls a tool.

Nothing here replaces Claude's own tools. Files, shell commands and web search stay with them. tools++ covers what's left: the things Claude would otherwise guess, estimate or script by hand.

No dependencies, only Node.js. Runs on Windows, macOS and Linux. Tool schemas are loaded when a tool is first needed, so having the plugin installed costs almost nothing.

Setup

1. Install Node.js

You need Node.js 20.3 or newer (22.5+ if you want the sqlite tool). Get it from nodejs.org and check that it works:

node --version

2. Optional: install ffmpeg

Only the media tools need it. Everything else works without it.

winget install Gyan.FFmpeg     # Windows
brew install ffmpeg            # macOS
sudo apt install ffmpeg        # Debian/Ubuntu

3. Add the plugin to Claude Code

Run these two commands inside Claude Code:

/plugin marketplace add Kessler833/tools-plus-plus
/plugin install tools-plus-plus@tools-plus-plus

4. Check that it works

Start a new session (or run /reload-plugins) and ask something like "what's 2^100 exactly?" or "how many working days are left this year in Bavaria?". Claude should call calc or holidays instead of answering from memory.

Other MCP clients

It's a normal stdio MCP server, so it also works in Claude Desktop, Cursor, VS Code, Windsurf, Cline, Zed, Codex CLI, Gemini CLI etc. Clone the repo:

git clone https://github.com/Kessler833/tools-plus-plus.git

and add this to the client's MCP config, with the path to where you cloned it:

{
  "mcpServers": {
    "tools-plus-plus": {
      "command": "node",
      "args": ["/path/to/tools-plus-plus/server/index.mjs"]
    }
  }
}

ChatGPT can't use it directly, since it only connects to remote (HTTP) MCP servers.

Or just ask your AI agent

Paste this into Claude Code, Cursor or whatever agent you use:

Install the tools++ MCP server from https://github.com/Kessler833/tools-plus-plus for me and check that it works.

Related MCP server: SysControl MCP

Tools

Math

Tool

calc

Exact math with fractions and big integers (0.1 + 0.2 is 0.3, 1000! works), percent, variables. Says when a result is only approximate.

solve

Linear equations and systems exactly, real roots of nonlinear equations

matrix

Determinant, inverse, rank, rref etc. with exact fractions

number_theory

Prime test, factorization, divisors, base conversion

finance

Compound interest, loans with amortization, NPV, IRR, CAGR

stats

Mean, median, sd, quartiles, outliers, histogram, correlation, regression. Works on lists and CSV columns.

convert_units

Units (also things like km/h or L/100km to mpg), temperatures, currencies (ECB rates)

random

Random numbers, picks, shuffles, UUIDs, passwords, dice

Dates

Tool

time_now

Current date and time, ISO week, other time zones

time_convert

Time zone conversion, handles DST gaps

date_diff, date_add

Differences and date math, business days

holidays

Public holidays (DE with all states, AT, CH, US, GB, FR, others online), business days without holidays

calendar

Month view, "last friday of november", ISO weeks

cron

Explains a cron expression and lists the next runs

Text and data

Tool

text_stats

Words, characters, tokens, reading time, hidden characters, mixed line endings

text_transform

camelCase/snake_case/slugs, sort, dedupe, wrap, Unicode cleanup

token_count

Rough token count of a file or folder

diff

Line diff or word/char diff

regex

Test a regex, see groups and replacements. Hanging patterns get killed after a timeout.

extract

Pull URLs, emails, dates, amounts etc. out of text

markdown

Lint, table of contents, link check, table formatting

encode, hash

base64, URL, HTML, JWT and so on, checksums

json, schema

Validation with line/column, queries, JSON Schema

table, table_convert

Filter, group and join CSV/JSON/Markdown tables, convert between formats

sqlite

Look into SQLite files (read-only)

pdf_text

Text of a PDF per page, or search in it

color

Color conversions, contrast check, palettes

Files and system

Tool

disk_usage

What takes up the space in a folder

find_duplicates

Identical files (doesn't delete anything)

batch_rename

Rename many files with a preview and undo

archive

zip, tar, tar.gz, gz. Refuses paths that would escape the target folder.

snapshot

Save a folder's state before risky changes and restore it

secret_scan

Finds API keys and passwords before you commit them

env_compare

.env against .env.example

log_summary

Errors first, then the most common lines of a log

processes

Which process uses port 3000, process list, kill

sysinfo

OS, CPU, RAM, disk space, installed dev tools

run_parallel

Run several commands at once

benchmark

Time commands and compare them

wait_for

Wait for a file, port, URL or process

deps_check

Outdated and deprecated packages in package.json, requirements.txt, pyproject.toml, Cargo.toml

Web

Tool

http

Send a request, see status, timing and response

net

DNS, port reachability, TLS certificate expiry

package_info

Latest version of an npm/PyPI/crates package or GitHub repo

weather

Weather via Open-Meteo

wikipedia

Wikipedia summaries

Media (needs ffmpeg)

Tool

media_info

Codec, resolution, duration etc.

video_frames

Pulls frames out of a video so Claude can actually look at it

audio_analyze

Loudness, clipping, silence, waveform image

image_compare

Pixel diff between two images

image_edit

Resize, crop, rotate, convert

What goes online

Everything runs locally. These tools make network requests, and only when they're called: convert_units for currencies (frankfurter.dev), holidays for countries that aren't built in (date.nager.at), package_info and deps_check (npm, PyPI, crates.io, GitHub), weather (open-meteo.com), wikipedia, and http, net and wait_for for whatever address you give them.

Development

node test/run.mjs            # tests, offline
node test/run.mjs --online   # including the web tools

Each tool is one entry in server/tools.mjs, the code lives in server/lib/.

License

MIT

This server cannot be deployed

Shareable, User-Owned Context BackendPeople, applications, and agents read, write, and coordinate together in one context lake. Reach it over MCP, a CLI, a Python SDK, or REST.fulcradynamics.comAd

Maintenance

ActivityMaintained
ResponsivenessNo recent community issues

Resources

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