Is io.github.coo-quack/calc-mcp safe to use?

io.github.coo-quack/calc-mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.

How do I install io.github.coo-quack/calc-mcp?

io.github.coo-quack/calc-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can io.github.coo-quack/calc-mcp do?

io.github.coo-quack/calc-mcp provides 21 tools: math, count, datetime, random, hash and 16 more. See the full tools list on the server page for descriptions and parameters.

What AI clients work with io.github.coo-quack/calc-mcp?

io.github.coo-quack/calc-mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is io.github.coo-quack/calc-mcp actively maintained?

io.github.coo-quack/calc-mcp is actively maintained — last commit was 1 day ago. It has 9 GitHub stars.

io.github.coo-quack/calc-mcp

21 MCP tools for math, randomness, dates, encoding, hashing, and more — deterministic and accurate.

9 21 tools GitHub

No known CVEs

No license

Actively maintained

Last commit 1d ago

Works with most clients

Transport: stdio, sse, http

21 tools · ~814 tok

Grade B · 0.4% of 200K ctx

Edit this pageView history

Productivity Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "calc-mcp": {
      "args": [
        "--prefix",
        "/tmp",
        "-y",
        "@coo-quack/calc-mcp@latest"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-coo-quack-calc-mcp)](https://mcppedia.org/s/io-github-coo-quack-calc-mcp)

Read me

What io.github.coo-quack/calc-mcp does

📖 Documentation — Full tool reference, examples, and install guides.

Test This Server

No automated test available for this server. Check the GitHub README for setup instructions.

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

67/100across 5 weighted dimensions

How we score →

0255075100

−33

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

No package registry to scan.

Inventory

Tools (21)

Click any tool to inspect its schema.

~814 tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.coo-quack/calc-mcp safe to use?: io.github.coo-quack/calc-mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.coo-quack/calc-mcp?: io.github.coo-quack/calc-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can io.github.coo-quack/calc-mcp do?: io.github.coo-quack/calc-mcp provides 21 tools: math, count, datetime, random, hash and 16 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with io.github.coo-quack/calc-mcp?: io.github.coo-quack/calc-mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is io.github.coo-quack/calc-mcp actively maintained?: io.github.coo-quack/calc-mcp is actively maintained — last commit was 1 day ago. It has 9 GitHub stars.

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Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Productivity Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "calc-mcp": {
      "args": [
        "--prefix",
        "/tmp",
        "-y",
        "@coo-quack/calc-mcp@latest"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-coo-quack-calc-mcp)](https://mcppedia.org/s/io-github-coo-quack-calc-mcp)

Read me

What io.github.coo-quack/calc-mcp does

📖 Documentation — Full tool reference, examples, and install guides.

Test This Server

No automated test available for this server. Check the GitHub README for setup instructions.

README

Calc MCP

📖 Documentation — Full tool reference, examples, and install guides.

21 tools for things AI is not good at — deterministic math, cryptographic randomness, accurate date arithmetic, encoding, hashing, and more.

LLMs hallucinate calculations, can't generate true random numbers, and struggle with timezones. This MCP server fixes that.

Quick Start

# Claude Code
claude mcp add -s user calc-mcp -- npx --prefix /tmp -y @coo-quack/calc-mcp@latest

# Or just run it
npx --prefix /tmp -y @coo-quack/calc-mcp@latest

Works with Claude Desktop, VS Code Copilot, Cursor, Windsurf, and any MCP client — setup guides below.

Why?

AI alone	With calc-mcp
"10 + 34 × 341 ÷ 23 = 507.8" ❌	`514.087` ✅ (math)
"Here's a UUID: 550e8400-..." 🤷 fake	Cryptographically random UUID v4/v7 ✅ (random)
"100 days from now is..." 🤔 guess	`2026-05-22` ✅ (date)
"SHA-256 of password123 is..." 💀 hallucinated	`{"hash": "ef92b778bafe..."}` ✅ (hash)

Deterministic — Same input, same correct output, every time
Secure — Sandboxed math, ReDoS protection, weak hash warnings
Private — All computation runs locally, no data sent to external services
No server config — Install once via npx; MCP client setup required
No API key — No account or API key required for calc-mcp itself; requires Node.js

Examples

Ask in natural language — your AI assistant selects the appropriate tool.

Math & Numbers

You ask	You get	Tool
What's 10 + 34 × 341 ÷ 23?	`514.087`	math
Convert 255 to binary	`11111111`	base
Is 4539578763621486 a valid card number?	`true`	luhn

Text & Encoding

You ask	You get	Tool
How many characters in "Hello, World! 🌍"?	`15 chars, 18 bytes`	count
Base64 encode "Hello World"	`SGVsbG8gV29ybGQ=`	base64
Base64 decode "eyJhbGciOiJIUzI1NiJ9"	`{"alg":"HS256"}`	base64
URL-encode "hello world"	`hello%20world`	encode
URL-decode "hello%20world"	`hello world`	encode
HTML-decode `<script>`	`<script>`	encode
SHA-256 hash of "password123"	`{"hash": "ef92b778bafe..."}`	hash
HMAC-SHA256 of "message" with key "secret"	`{"hash": "8b5f48702995..."}`	hash

Date & Time

You ask	You get	Tool
What time is it in New York?	`2026-02-10T19:00:00-05:00`	datetime
What's 100 days after 2026-02-11?	`2026-05-22`	date
When does "30 9 * * 1-5" run?	`Mon–Fri at 9:30`	cron_parse

Generation

| You ask | You get | Tool | | -------------------

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

67/100across 5 weighted dimensions

How we score →

0255075100

−33

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

No package registry to scan.

Inventory

Tools (21)

Click any tool to inspect its schema.

~814 tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.coo-quack/calc-mcp safe to use?: io.github.coo-quack/calc-mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.coo-quack/calc-mcp?: io.github.coo-quack/calc-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can io.github.coo-quack/calc-mcp do?: io.github.coo-quack/calc-mcp provides 21 tools: math, count, datetime, random, hash and 16 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with io.github.coo-quack/calc-mcp?: io.github.coo-quack/calc-mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is io.github.coo-quack/calc-mcp actively maintained?: io.github.coo-quack/calc-mcp is actively maintained — last commit was 1 day ago. It has 9 GitHub stars.