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mcp/harbor
Verified official

Check Digit Validator MCP

v0.1.0

com.gumballtools/check-digit

Validates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit

transport:streamable-http
View source Website

Target client

run in your project directory 

claude mcp add --transport http check-digit https://check-digit.gumballtools.com/api/mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

This listing does not declare its tools. Connect the server and your client will discover them on the handshake.