21 MCP tools for math, randomness, dates, encoding, hashing, and more — deterministic and accurate.
{
"mcpServers": {
"io-github-coo-quack-calc-mcp": {
"command": "<see-readme>",
"args": []
}
}
}No install config available. Check the server's README for setup instructions.
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21 MCP tools for math, randomness, dates, encoding, hashing, and more — deterministic and accurate.
Is it safe?
No package registry to scan.
No authentication — any process on your machine can connect.
License not specified.
Is it maintained?
Last commit 3 days ago. 8 stars.
Will it work with my client?
Transport: stdio. Works with Claude Desktop, Cursor, Claude Code, and most MCP clients.
No automated test available for this server. Check the GitHub README for setup instructions.
No known vulnerabilities.
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Privacy-first. MCP is the protocol for tool access. We're the virtualization layer for context.
Pre-build reality check. Scans GitHub, HN, npm, PyPI, Product Hunt — returns 0-100 signal.
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📖 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.
# 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.
| 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) |
Ask in natural language — your AI assistant selects the appropriate tool.
| 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 |
| 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 |
| 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 |
| You ask | You get | Tool | | -------------------