Luhn checksum validation, computation, and completion via @mukundakatta/luhn-mcp — credit cards, identifiers

{
  "package": "@mukundakatta/luhn-mcp",
  "version": "0.1.0",
  "transport": "stdio",
  "install": "npm install @mukundakatta/luhn-mcp @modelcontextprotocol/sdk",
  "entry": "node_modules/@mukundakatta/luhn-mcp/dist/server.js",
  "tools": {
    "verify": {
      "description": "Run the Luhn check on a number. Spaces and dashes in input are ignored.",
      "input": {
        "input": "string"
      },
      "traces": [
        {
          "call": {
            "input": "4532015112830366"
          },
          "result": {
            "valid": true
          },
          "ms": 2,
          "note": "valid Visa"
        },
        {
          "call": {
            "input": "4111111111111111"
          },
          "result": {
            "valid": true
          },
          "ms": 0,
          "note": "test Visa"
        },
        {
          "call": {
            "input": "5500000000000004"
          },
          "result": {
            "valid": true
          },
          "ms": 1,
          "note": "Mastercard"
        },
        {
          "call": {
            "input": "378282246310005"
          },
          "result": {
            "valid": true
          },
          "ms": 1,
          "note": "Amex"
        },
        {
          "call": {
            "input": "6011111111111117"
          },
          "result": {
            "valid": true
          },
          "ms": 0,
          "note": "Discover"
        },
        {
          "call": {
            "input": "79927398713"
          },
          "result": {
            "valid": true
          },
          "ms": 1,
          "note": "Wikipedia Luhn example"
        },
        {
          "call": {
            "input": "4532015112830367"
          },
          "result": {
            "valid": false
          },
          "ms": 1,
          "note": "bad check digit"
        },
        {
          "call": {
            "input": "0000000000000000"
          },
          "result": {
            "valid": true
          },
          "ms": 2,
          "note": "all zeros valid"
        },
        {
          "call": {
            "input": "4532 0151 1283 0366"
          },
          "result": {
            "valid": true
          },
          "ms": 0,
          "note": "spaces stripped"
        },
        {
          "call": {
            "input": "4532-0151-1283-0366"
          },
          "result": {
            "valid": true
          },
          "ms": 1,
          "note": "dashes stripped"
        },
        {
          "call": {
            "input": ""
          },
          "result": "luhn failed: input must be digits (spaces and dashes allowed)",
          "ms": 0
        },
        {
          "call": {
            "input": "abc"
          },
          "result": "luhn failed: input must be digits (spaces and dashes allowed)",
          "ms": 0
        },
        {
          "call": {
            "input": "1"
          },
          "result": {
            "valid": false
          },
          "ms": 0,
          "note": "single digit"
        }
      ]
    },
    "checksum": {
      "description": "Compute the Luhn check digit (the digit that would make the input check-valid).",
      "input": {
        "input": "string"
      },
      "traces": [
        {
          "call": {
            "input": "453201511283036"
          },
          "result": {
            "check_digit": 6
          },
          "ms": 1,
          "note": "Visa 15→check=6"
        },
        {
          "call": {
            "input": "411111111111111"
          },
          "result": {
            "check_digit": 1
          },
          "ms": 0
        },
        {
          "call": {
            "input": "7992739871"
          },
          "result": {
            "check_digit": 3
          },
          "ms": 0,
          "note": "Wikipedia example"
        },
        {
          "call": {
            "input": "0"
          },
          "result": {
            "check_digit": 0
          },
          "ms": 1
        }
      ]
    },
    "complete": {
      "description": "Append the Luhn check digit to an input that lacks one.",
      "input": {
        "input": "string"
      },
      "traces": [
        {
          "call": {
            "input": "453201511283036"
          },
          "result": {
            "complete": "4532015112830366"
          },
          "ms": 0
        },
        {
          "call": {
            "input": "411111111111111"
          },
          "result": {
            "complete": "4111111111111111"
          },
          "ms": 0
        },
        {
          "call": {
            "input": "7992739871"
          },
          "result": {
            "complete": "79927398713"
          },
          "ms": 1
        },
        {
          "call": {
            "input": "550000000000000"
          },
          "result": {
            "complete": "5500000000000004"
          },
          "ms": 0
        }
      ]
    }
  },
  "test_summary": "24/24 calls succeeded, p50 latency 0ms"
}