All tools

Every tool of the EenFactuurMaken.nl MCP server with what it does, an example request and example arguments, plus the resources and the built-in prompts.

Your assistant picks the right tool itself. You don't need to know the names, but it helps to know what's possible. Each tool shows whether it only reads, changes something or sends something; AI apps usually ask for your confirmation before changing or sending.

Give amounts in euros with unitPrice (for example 85 or "85.50"), or in cents with unitPriceCents. Prices are always excluding VAT.

Account and business

Tool	Type	What it does
`get_account`	Read	Your plan, its limits and how many invoices you have left this month.
`get_business_profile`	Read	Your business details, numbering and defaults, plus what's still missing for a valid invoice.
`update_business_profile`	Change	Update business details, numbering, defaults and house style. Not: IBAN, BIC, account holder name, reply-to address and payment link (those only work in the web app).

Example: "Set my KvK number to 12345678 and my VAT ID to NL001234567B01."

json

{ "kvkNumber": "12345678", "vatNumber": "NL001234567B01" }

Customers and products

Tool	Type	What it does
`list_customers`	Read	Search customers by name, email, KvK or VAT number.
`get_customer`	Read	One customer with all details.
`create_customer`	Change	Add a customer. For Dutch businesses with a KvK number, for reverse charge and EU customers with a VAT number.
`update_customer`	Change	Update a customer. `archived: true` archives, `false` restores.
`list_products`	Read	Search products and services.
`create_product`	Change	A product or service with a price (excl. VAT), unit and VAT rate.

Example: "Add Muster GmbH from Berlin, VAT number DE123456789."

json

{ "type": "business", "name": "Muster GmbH", "city": "Berlin", "country": "DE", "vatNumber": "DE123456789" }

Invoices

Tool	Type	What it does
`list_invoices`	Read	Search invoices by status (including `open` and `overdue`), kind, customer, text or period.
`get_invoice`	Read	An invoice with lines, totals, VAT per rate and (for a draft) the checks.
`create_invoice`	Change	Create a draft, for an existing customer (`customerId`) or a new one (`customer`). Nothing is numbered or sent.
`update_invoice`	Change	Update a draft. `lines` replaces all lines.
`duplicate_invoice`	Change	Copy an invoice into a new draft dated today. Counts towards your monthly limit.
`issue_invoice`	Finalise	Check, number and lock it. Can't be undone.
`create_credit_note`	Finalise (optional)	A credit note for a finalised invoice: in full, or partially with `lines`. With `issue: true` it's finalised straight away.
`mark_invoice_paid`	Change	Mark an invoice as paid (today by default).
`check_invoice_compliance`	Read	Check whether an invoice meets the Dutch requirements.
`get_next_invoice_number`	Read	The number the next invoice and credit note will get. Nothing is reserved.

Example: "Create an invoice for Bakkerij De Gouden Korst: 12 hours of web design at €85 and hosting for €120."

json

{
  "customerId": "…",
  "lines": [
    { "description": "Web design", "quantity": 12, "unit": "HUR", "unitPrice": 85 },
    { "description": "Hosting (year)", "unitPrice": 120 }
  ]
}

Example: "Credit €200 of invoice 2026-0012." (create_credit_note)

json

{
  "id": "…",
  "lines": [ { "description": "Discount on invoice 2026-0012", "unitPrice": 200, "vatRate": 21 } ]
}

All invoice fields of the REST API work here too, like vatTreatment, supplyType, supplyDate, currency, locale, reference, buyerReference, notes, paymentLink and (Pro) layoutId.

Sending

Tool	Type	What it does
`send_invoice`	Send	Email a finalised invoice or credit note with the PDF (and UBL). To the customer's address by default.
`send_payment_reminder`	Send	Send a payment reminder now for an outstanding invoice.

On Free the same rules apply as in the app: only to your customer or yourself. See Sending by email.

Documents and figures

Tool	Type	What it does
`get_invoice_download_links`	Read	Temporary links (15 minutes by default, `ttlMinutes` 1 to 60) for the PDF and UBL. They work without signing in. For finalised invoices it also returns the `publicUrl` of the online invoice.
`get_stats`	Read	Outstanding, overdue, paid, turnover this year, your monthly limit and VAT per quarter per box. With `quarter` (and `year`) for another quarter.
`list_recurring_invoices`	Read	Your recurring invoices (Pro).

Example: "How much VAT do I owe for the third quarter?" (get_stats)

json

{ "year": 2026, "quarter": 3 }

Resources

Every invoice is also available as the resource invoice://{id} (JSON, the same shape as the API). Apps that support resources show your latest 50 invoices and can add one to the conversation as context.

Prompts

Ready-made tasks your app can show as shortcuts (in Claude, for example, through the + or / menu):

Prompt	Arguments	What it does
`create-invoice`	`customer`, `work`, `language`	Create a correct invoice step by step: check your business details, find or create the customer, lines, VAT, checks, and after your approval issue and send it.
`monthly-overview`	`month` (YYYY-MM), `language`	A monthly overview: invoiced, paid, outstanding and overdue, plus the VAT for the quarter.
`chase-overdue-invoices`	`language`	Find overdue invoices and send reminders after your approval.

language is nl (default) or en. You'll find more ready-made requests in the prompt library.

Errors

If something goes wrong, your assistant gets a clear error with a tip, for example which details are missing for a valid invoice, or a link to your subscription for a Pro feature. The codes are the same as for the REST API.

Last updated on 13 October 2026

Stuck?

Email us at support@eenfactuurmaken.nl. Tell us what you tried and what happened, and we will help you out.

support@eenfactuurmaken.nl