Quaderno MCP server

What the model can do

Quaderno invoicing and tax: invoices and expenses by state, date, customer or supplier with totals, contacts, and the tax rate that applies to a sale to a given country. Can create, email, void or mark uncollectible an invoice, record a payment on it, edit its tags and notes, issue a credit note, record an expense, and create, edit or delete a contact, each only when asked.

Reads

• quaderno_invoicesQuaderno invoices, newest first: number, issue and due dates, state (outstanding, late, uncollectible, paid), currency, subtotal and total…
• quaderno_expensesQuaderno expenses (purchases recorded for tax), newest first: issue date, state (outstanding, late, paid), currency, total, supplier, PO number…
• quaderno_contactsQuaderno contacts (customers and suppliers), newest first: name, person or company, contact person, email, country, language and tax status.
• quaderno_tax_rateThe tax Quaderno would apply to a sale to a customer in a given country (and postal code or city for US sales tax): tax name, rate, taxable part…

Acts, when you ask

These change something in Quaderno. The model is told to use them only when you ask for exactly that, and each one is granted by name: per team on a shared connection, by the owner on a personal one.

• quaderno_create_invoiceCreate a Quaderno invoice for an existing contact (contact_id) or a new one (contact).
• quaderno_deliver_invoiceEmail a Quaderno invoice to its customer, using the account's invoice template and language.
• quaderno_void_invoiceVoid a Quaderno invoice.
• quaderno_mark_invoice_uncollectibleMark a Quaderno invoice as uncollectible (you do not expect it to be paid).
• quaderno_record_invoice_paymentRecord a payment received against a Quaderno invoice (no money moves).
• quaderno_update_invoiceChange a Quaderno invoice's tags, payment details shown to the customer, internal notes or metadata.
• quaderno_create_credit_noteIssue a Quaderno credit note refunding an invoice, in full (full_credit: true) or, for a single-item invoice only, in part (credited_amount).
• quaderno_create_expenseRecord a Quaderno expense (a purchase, for tax) from an existing supplier contact (contact_id) or a new one (contact).
• quaderno_create_contactCreate a Quaderno contact (a customer or supplier).
• quaderno_update_contactChange a Quaderno contact's details.
• quaderno_delete_contactPermanently delete a Quaderno contact.

Connect it

First connect Quaderno on Dashboard → Connections, then add Memtro to your client once. The Quaderno tools appear alongside the tools of everything else you have connected; nothing is configured per connector.

claude plugin marketplace add memtro-org/claude-memtro
claude plugin install memtro@memtro --config api_key=sk-memtro-...

{
  "mcpServers": {
    "memtro": {
      "url": "https://platform.memtro.com/api/mcp",
      "headers": {
        "Authorization": "Bearer sk-memtro-..."
      }
    }
  }
}

{
  "mcp": {
    "memtro": {
      "type": "remote",
      "url": "https://platform.memtro.com/api/mcp",
      "headers": {
        "Authorization": "Bearer sk-memtro-..."
      }
    }
  }
}

Who may use it

The key identifies the person, and the server offers that person the tools they may use everywhere else in Memtro. A shared Quaderno connection is used by the teams an administrator granted it to, tool by tool, on the Permissions page; a personal connection is used by its owner alone, and its tools that act stay off until the owner allows them. See Teams and permissions and Connectors.

Ask it like this

• › Which Quaderno invoices are late?
• › What VAT do we charge a German customer for SaaS?
• › How much did we spend with our hosting supplier this quarter?
• › What have we invoiced Northwind this year?
• › Record Northwind's bank transfer against invoice 118

Questions

Is this an official Quaderno MCP server?

No. It is Memtro's MCP server with Memtro's Quaderno connector behind it: the connector reads Quaderno through its API with the credentials you connect on Dashboard → Connections, and Quaderno publishes nothing here. The same endpoint carries every other system you connect and Memtro's memory tools.

What does it cost?

Nothing on top of Memtro. One price per organisation by its number of users, from $50 a month for up to 10 users after a 7-day free trial, with every connector, the MCP server, jobs and memory included. You bring your own model keys.

Can it change anything in Quaderno?

Only when you ask, and only what it has been granted: create an invoice (takes the next legal invoice number, nothing is sent); email an invoice to its customer; void an invoice, which issues a credit note against it (permanent); mark an invoice uncollectible; record a payment against an invoice; change an invoice's tags, payment details, notes or metadata; issue a credit note refunding all or part of an invoice (permanent); record an expense; create a contact; edit a contact's details; delete a contact (permanent). Every other tool reads, searches or lists. An administrator grants each acting tool by name per team, and a personal connection acts only after its owner allows it.

Which clients work?

Any MCP client that speaks Streamable HTTP: Claude Code, Cursor, Claude Desktop, OpenCode, Codex, Zed, Windsurf, Cline and the Anthropic and OpenAI SDKs. There is no local process to run; the server is remote and authenticated with your key.

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