NAV Online Számla

Through the NAV Online Szamla API, your AI assistant can directly query your outgoing and incoming invoices, check VAT numbers, and summarize your financial data.

Credentials

All data is protected on the server with AES-256-GCM encryption.

Write operations

Decide whether your assistant can only read, or also make changes through this connector.

Enable write tools

Read tools (lists, queries) are always available. When enabled, write tools (create, update, delete) become available too. Transactional calls are logged for 90 days.

Affected write tools (2)

manage_invoice: Submit invoice data to NAV (create, modify, or storno). Accepts BASE64-encoded invoice XML.
manage_annulment: Submit technical annulment for invoices.

Available tools (9)

These are the tools your assistant can invoke on this connector, in plain language.

read-only

Query (7)

These tools only read: they fetch data and never change anything.

query_taxpayer
Query taxpayer information from NAV by tax number. Returns company name, address, VAT status.
claude >Check VAT number 12345678
query_invoice_data
Get full invoice data by invoice number. Returns complete invoice details.
claude >Show me invoice INV-2024-001
query_invoice_digest
Search invoices with filters. Returns paginated invoice summaries by date range or original invoice number.
claude >List last month's incoming invoices
query_invoice_check
Check if an invoice exists in NAV system.
claude >Does invoice INV-2024-050 exist in NAV?
query_invoice_chain_digest
Query the modification chain of an invoice (original + all modifications/stornos).
claude >Show modification history of invoice INV-2024-001
query_transaction_status
Check the processing status of a previously submitted invoice transaction.
claude >What is the status of transaction TX-123?
query_transaction_list
List transactions within a date range.
claude >List all NAV transactions from this week

write

Actions (2)

These tools create or modify data. Query tools are always available; write tools can be toggled in the connector settings.

manage_invoice
Submit invoice data to NAV (create, modify, or storno). Accepts BASE64-encoded invoice XML.
claude >Submit this invoice XML to NAV
manage_annulment
Submit technical annulment for invoices.
claude >Annul invoice INV-2024-099 for technical error

What is it for?

The NAV connector connects to the Hungarian Tax Authority's Online Invoice system. With a technical user login it can read invoice data, export XML, and verify VAT numbers, all through your AI agent in plain language.

onlineszamla.nav.gov.hu

Usage

This is how to call this connector through the MCP endpoint.

MCP call example

{
  "connector": "nav",
  "action": "...",
  "params": { ... }
}

You can find the MCP endpoint URL on the API keys page.

Documentation

NAV Online Számla official docs

Having trouble? Email us at support@connectors.hu.