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PESEL/NIP/REGON Validator

by com.apished
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Server Details

Validates Polish PESEL, NIP, and REGON checksums; PESEL also decodes birth date and sex.

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Status
Healthy
Uptime
100.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
URL
ChatGPT
–
Claude
–

TDQS

A4.4/5.0

Scored across 3 tools

Disambiguation5/5

Each tool targets a distinct Polish identification number type (NIP, PESEL, REGON) with no functional overlap. The descriptions clearly differentiate their validation logic and outputs.

Naming Consistency5/5

All tool names follow a consistent pattern: the identifier type in lowercase plus '_validate'. This uniform verb_noun structure makes the tool purpose immediately clear.

Tool Count5/5

Three tools perfectly scope the server's purpose as a focused Polish ID validator. Each tool serves a distinct, well-defined function without redundancy.

Completeness5/5

The server covers all three primary Polish identification numbers (NIP, PESEL, REGON) that commonly require validation. There are no obvious missing identifiers for this specific domain.

Available Tools

3 tools
nip_validateAInspect

Validates the checksum of a 10-digit Polish tax identification number (NIP). Checksum uses weights 6 5 7 2 3 4 5 6 7 over the first 9 digits; sum mod 11 must equal the 10th digit. A sum mod 11 of 10 is itself invalid.

Inputs: value (required). Returns: valid, reason

pesel_validateAInspect

Validates the checksum of an 11-digit Polish national identification number (PESEL). Checksum uses weights 1 3 7 9 1 3 7 9 1 3 over the first 10 digits; control digit is (10 - sum mod 10) mod 10. On success also decodes the date of birth and sex embedded in the number; a checksum-valid number with an impossible calendar date (e.g. Feb 30) is still reported invalid.

Inputs: value (required). Returns: sex, valid, reason, birthDate

regon_validateAInspect

Validates the checksum of a 9- or 14-digit Polish business registry number (REGON). 9-digit: weights 8 9 2 3 4 5 6 7 over the first 8 digits, sum mod 11 (10 mapped to 0) must equal the 9th digit. 14-digit: the first 9 digits must themselves be a valid 9-digit REGON, and weights 2 4 8 5 0 9 7 3 6 1 2 4 8 over the first 13 digits (sum mod 11, 10 mapped to 0) must equal the 14th digit.

Inputs: value (required). Returns: valid, reason

Tool Schema Changelog

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