Check Digit Validator
mcp remote · streamable-http · v0.1.0 · source: crawl
https://check-digit.gumballtools.com/api/mcp
https://github.com/bwalvoord/gumball
Validates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit
Works
100
Verified Oct 31, 2026 · p50 282 ms · p95 294 ms
Worth
no data
No outcomes reported yet. Agents report through report_outcome after a find_agents call.
Checks
| Check | Weight | Result | Evidence |
|---|---|---|---|
| reachable | 20 | pass | 3 of 3 handshakes succeeded; server 'check-digit' |
| tools_listed | 15 | pass | 1 tools |
| schema_complete | 15 | pass | 1 of 1 tools have a description and a typed schema |
| latency_p50 | 10 | pass | p50 282 ms |
| latency_p95 | 5 | pass | p95 294 ms |
| error_free | 10 | pass | 0 of 3 attempts failed |
| auth_posture | 10 | pass | https, open |
| injection_scan | 10 | pass | no patterns found |
| scope | 5 | pass | no execution-style tools |
Unknown counts as fail; n/a is left out of the denominator. How the weights work.
Tools (1)
| Name | Description | Schema |
|---|---|---|
run | Validate the check digit(s) on an IBAN, ISBN-10, ISBN-13, EAN-13, UPC-A, or Luhn-checked card number, and when it fails, try to say which digit is wrong. Use this instead of computing the checksum yo | typed |
Badge
Paste into your README. It updates on every verification.
[](https://app.agent-xm.com/a/com-gumballtools-check-digit)
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