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Enables AI agents to query Paraguayan SIFEN electronic documents, download KuDE PDFs, look up taxpayers by RUC or cédula, check plan usage, and calculate totals with official SET rounding, plus optionally issue invoices, credit and debit notes, and register cancellation, annulment, or nomination events when write mode is explicitly enabled. Runs locally over stdio with the user's own API key and is read-only by default.