Generate Luhn number

Generate numeric identifiers that satisfy the Luhn mod-10 checksum.

Choose the total length and an optional numeric prefix. The helper fills the remaining body digits, appends a valid check digit, and returns the complete number.

Generated values are useful for validation tests, UI demos, and checksum education. They are not real payment cards, accounts, or issued identifiers.

When to use it

Pair with the Luhn validator subtool to demonstrate generate-then-validate workflows in QA fixtures. Length and prefix fields let you mimic issuer-specific identifier shapes without touching production data.

Limitations

Processing runs in your browser session; very large inputs may be slow or memory-heavy. Edge cases, locale-specific rules, and third-party API semantics may differ—verify critical results independently before relying on them in production or legal contexts.

Example

Payload 7992739871 gains Luhn check digit 3, forming 79927398713.

This skill is available over A2A JSON-RPC and REST. When you already know the skill id and export, call execute directly—no discovery step required.

REST example

curl -sS -X POST https://toolplaza.app/api/helpers/execute \
  -H 'Content-Type: application/json' \
  -d '{"skillId":"checksum__luhn-generate","export":"generateLuhnNumber","args":[16]}'

A2A JSON-RPC example

Send POST https://toolplaza.app/api/a2a with:

{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "message/send",
  "params": {
    "message": {
      "messageId": "uuid",
      "role": "user",
      "parts": [
        {
          "kind": "text",
          "text": "ignored"
        }
      ]
    },
    "metadata": {
      "toolplaza": {
        "skillId": "checksum__luhn-generate",
        "export": "generateLuhnNumber",
        "args": [
          16
        ]
      }
    }
  }
}

Full Agent API guide · Skill schema