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MCP MCP 2025-06-18 streamable-http

Check Digits

dev.toolstop/check-digits

Catch a mistyped barcode, ISBN, VIN, NPI or LEI before a bad identifier corrupts a record.

Uptime
66.7%
3 direct probes · 30d
Response
100ms
last probe
Tools
3
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://check-digits.toolstop.dev

Tools · 3

validate_identifier

Verify a number when you already know what it is supposed to be. Use this whenever someone gives you a product barcode (GTIN, UPC or EAN), a book number (ISBN-10 or ISBN-13), a vehicle VIN, a US healt…

identify_format

Identify a bare number whose type was never recorded. Tests it against every supported format and reports which ones its check digit satisfies. Use it for an unlabeled spreadsheet column, a value pull…

compute_luhn_digit

Given digits with the final check digit omitted, return the one that completes them. US healthcare NPIs and securities ISINs use the Luhn formula. Use it to build valid test fixtures, to recover a la…

How to use

Add to your Claude Desktop / Cursor / Cline MCP config:

{
  "mcpServers": {
    "check_digits": {
      "url": "https://check-digits.toolstop.dev",
      "transport": "streamable-http"
    }
  }
}