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Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.","inputSchema":{"type":"object","properties":{"value":{"type":"string","minLength":1,"maxLength":512,"description":"String to check, e.g. PL61109010140000071219812874"}},"required":["value"],"$schema":"https://json-schema.org/draft/2020-12/schema"},"annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false},"definitionHash":"8c7e8269f384843f0d1b9a52486cf916155541b4682fed705718475a42e8d550","schemaStatus":"valid","origin":"official-registry","observedAt":"2026-11-03T10:46:39.334Z","metadataTrust":"untrusted"},{"serverName":"com.crewofthecaptain/format-checker","endpointFingerprint":"eb6116b6ec0ccb506dce1c51d703a4d295e16355e37d13cb58cfd113c63f7340","name":"validate_pl_nip","title":null,"description":"Polish NIP tax id: 10 digits + weighted mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. 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