Polymath Megablaster MCP

Name: Polymath Megablaster MCP
Author: headlessherm-creator

by headlessherm-creatorversion 3.1.0i★ –iRuns on your computer

Registry nameio.github.headlessherm-creator/polymath-megablaster-mcp

Install

Overview

Description from the maker (original English)

Local deterministic calc MCP: exact math, dates, unit conversion, stats, subnet math.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "polymath-megablaster": {
      "command": "npx",
      "args": [
        "-y",
        "polymath-megablaster-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add polymath-megablaster -- npx -y polymath-megablaster-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "polymath-megablaster": {
      "command": "npx",
      "args": [
        "-y",
        "polymath-megablaster-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "polymath-megablaster": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "polymath-megablaster-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account headlessherm-creator, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32655 servers in this category
Published to the registry more recently than 71% of the other 32655 servers in this category
Basic checks equal to or better than 100% of the other 32655 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Polymath Megablaster MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (3.1.0) reached the registry 15 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, SuperCollider

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Polymath MegaBlaster MCP — Deterministic Math, Date, Unit Conversion & Networking Tools for AI Agents

A free, local, 16-tool MCP server that gives AI agents exact, deterministic answers for math, date arithmetic, unit conversion, subnet/networking calculations, statistics, token counting, and real random UUID generation — no network calls, no API keys, no telemetry.

If your AI agent is miscounting days between dates, rounding large numbers incorrectly, getting unit conversions slightly wrong, or messing up subnet/CIDR math, this MCP server exists specifically to fix that class of problem.

The problem this solves

Local and open-weight models (Llama, Qwen, Mistral, etc.) are consistently unreliable at exact math, date arithmetic, unit conversion, and similar deterministic tasks — they "reason" their way to an answer instead of computing it, and get it subtly wrong. (Frontier hosted models like Claude and GPT-4 already handle most of this correctly unaided — this toolkit is aimed at closing the gap for smaller/local models, not replacing what those already do well.) Every tool here uses classical deterministic methods instead of model reasoning, so the answer is always exactly right.

Everyday things it fixes:

Exact math on huge numbers, no float rounding errors
Correct date math, including leap years and "last day of the month" edge cases
Unit conversion (km/miles, °C/°F, kg/lb) without approximation
Subnet/CIDR math for networking tasks
Great-circle distance between coordinates

More technical tools:

Arbitrary-precision arithmetic, factorials, permutations, combinations (no float64 overflow)
Statistics (mean, median, stdev, variance, percentiles) on a list of numbers
Base conversion (decimal, hex, binary, octal)
Levenshtein edit distance and similarity ratio (deterministic fuzzy matching)
IANA-aware time zone conversion
GPT tokenizer-based token counting, so an agent can manage its own context budget
Real cryptographically-random UUID (v4) generation — LLMs reliably fabricate plausible-looking but non-random, potentially colliding UUID strings instead

Why local

Most AI dev tool MCP servers either charge a subscription or call out to a remote API. This one never touches the network. Every tool is pure local computation, verifiable directly in the source: open src/tools.js — there is no fetch or http import anywhere in it.

Setup

1. Install Node.js (v18+) if you don't have it: https://nodejs.org

2. Clone this repo and install dependencies:

git clone https://github.com/headlessherm-creator/polymath-megablaster-mcp.git

cd polymath-megablaster-mcp npm install

3. Point your MCP client at the local path:

"mcpServers": { "polymath": { "command": "node", "args": ["/absolute/path/to/polymath-megablaster-mcp/src/index.js"] } } }

Add that to your MCP client's config and restart it. Setup docs for common clients:

Claude Desktop: https://modelcontextprotocol.io/quickstart/user
Cursor: https://docs.cursor.com/context/model-context-protocol
Claude Code: https://docs.claude.com/en/docs/claude-code/mcp

Tools (16, all free)

Deterministic math: calculate (arbitrary-precision expression evaluator), factorial, permutations, combinations (all arbitrary-precision, avoid float64 overflow), compute_statistics (mean, median, stdev, variance, percentiles)
Date and time: date_add, date_diff (leap years, month boundaries, business days handled correctly), convert_timezone
Conversion: convert_unit (length, weight, volume, temperature), convert_base (decimal, hex, binary, octal)
Networking: calc_subnet (CIDR math), check_ip_type (private/reserved range lookup)
Text: levenshtein_distance (exact edit distance and similarity ratio)
Geo: haversine_distance (exact great-circle distance between coordinates)
Agent utility: count_tokens (GPT tokenizer, for managing context budget before a large prompt), generate_uuid (real cryptographically-random v4 UUIDs, 1-100 at a time)

Dependencies

@modelcontextprotocol/sdk: the MCP protocol implementation
zod: input schema validation
mathjs: arbitrary-precision math evaluation
gpt-tokenizer: GPT tokenizer for count_tokens

All installed automatically by npm install. None of them make network calls at runtime.

Keywords

deterministic math MCP server, MCP date calculator, MCP unit converter, subnet CIDR calculator MCP, local MCP server no API key, Claude MCP math tools, AI agent exact arithmetic, token counter MCP server.

Related tools

Same local-first philosophy, different problems:

json-mender-mcp — fix malformed JSON, validate JSON Schema, test regex
hiring-mender-mcp — BambooHR + Greenhouse ATS write tools, one vocabulary
helpdesk-mender-mcp — Zendesk + Freshdesk + Help Scout write tools, one vocabulary

License

MIT

Polymath Megablaster MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

SuperCollider

README from the maker

Polymath MegaBlaster MCP — Deterministic Math, Date, Unit Conversion & Networking Tools for AI Agents

The problem this solves

Why local

Setup

Tools (16, all free)

Dependencies

Keywords

Related tools

License