// SCAN REPORT

Fortnox

20 tools. 6 can modify or destroy data without limits.

1 destructive tool with no built-in limits. Policy required.

Last updated: 30 Jun 2026

6 can modify or destroy data

14 read-only

20 tools total

Community server · catalogue entry verified 30/06/2026

How to control Fortnox ↓

TOOL MAP

What Fortnox exposes to your agents

Read (14) Write / Execute (5) Destructive / Financial (1)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

Critical Risk

The most dangerous Fortnox tools

Financial · Critical send_invoice Send an invoice to the customer via email. Write · Medium create_customer This tool creates a new customer record in the accounting system, which is a reversible write operation. Write · High create_invoice This tool creates new invoices, which are reversible write operations (invoices can typically be modified or cancelled). Write · Medium create_offer This tool creates a new financial document (quote/offer) in the accounting system, which is reversible (offers can be deleted or modified).

6 of Fortnox's 20 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control Fortnox

PolicyLayer is an MCP gateway — it sits between your AI agents and Fortnox, and nothing reaches the server without passing your rules. These are the rules we recommend:

Block financial tools by default

{
  "send_invoice": {
    "deny_if": [
      {
        "conditions": [],
        "on_deny": "Requires human approval."
      }
    ]
  }
}

Financial tools should be explicitly enabled per use case, not open by default.

Rate limit write operations

{
  "create_customer": {
    "limits": [
      {
        "counter": "create_customer_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "get_accounts": {
    "limits": [
      {
        "counter": "get_accounts_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register Fortnox — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON FORTNOX →

Instant setup, no code required.

FULL CATALOGUE

All 20 Fortnox tools

FINANCIAL 1 tools

Financial send_invoice Send an invoice to the customer via email.

WRITE 5 tools

Write create_customer Add a new customer to Fortnox. Write create_invoice Create a new invoice for a customer with line items. Write create_offer Create a quote/offer for a customer. Write create_supplier_invoice Record a new supplier invoice (expense/bill). Write create_voucher Create a manual journal entry (voucher). Rows must balance (total debit = total credit).

READ 14 tools

Read get_accounts Get the chart of accounts. Useful for finding account numbers for bookkeeping. Read get_company_info Get company information and settings from Fortnox. Read get_customer Get full details of a specific customer. Read get_financial_year Get information about financial/accounting years. Read get_invoice Get full details of a specific invoice by its document number. Read get_invoice_payments Check payment status and history for a specific invoice. Read get_supplier Get details of a specific supplier/vendor. Read list_cost_centers List cost centers for allocating expenses across departments or projects. Read list_customers Search and filter the customer database. Read list_invoices List and filter invoices. Supports filtering by status, date range, and pagination. Read list_orders List and filter sales orders. Read list_projects List all projects for tracking time and costs. Read list_supplier_invoices List incoming supplier invoices (bills/expenses). Read list_vouchers List journal entries/vouchers. Optionally filter by financial year.

EXPLORE

Related servers

Other MCP servers with similar tools — same risk classification, starter policies for each.

FAQ

Questions about Fortnox

Can an AI agent move money through the Fortnox MCP server? +

Yes. The Fortnox server exposes 1 financial tools including send_invoice. Without a policy, an autonomous agent can call these with no spend caps, no rate limits, and no approval flow. PolicyLayer lets you block financial tools by default, require human approval, or set per-tool rate limits — enforced on every call.

How do I prevent bulk modifications through Fortnox? +

The Fortnox server has 5 write tools including create_customer, create_invoice, create_offer. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach Fortnox.

How many tools does the Fortnox MCP server expose? +

20 tools across 3 categories: Financial, Read, Write. 14 are read-only. 6 can modify, create, or delete data.

How do I enforce a policy on Fortnox? +

Register the Fortnox MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every Fortnox tool call.

Deterministic rules across all 20 Fortnox tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON FORTNOX →

Instant setup, no code required.

20 Fortnox tools catalogued and risk-classified — across an index of 43,000+ MCP servers.