SweKit - Swedish validators

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Swedish personnummer/orgnr/bankgiro/OCR validation, kontonummer to IBAN, bankdagar.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "SweKit - Swedish validators": {
      "url": "https://swekit-api.zenith-ops.workers.dev/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (13)

• validate_personnummer read-only

  Validate a Swedish personnummer or samordningsnummer (format, Luhn checksum, birth date, age, gender). Checks format only; does not prove the person exists.

  Parameters:

  • value (required) — string — e.g. 811218-9876 or 198112189876

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• validate_orgnr read-only

  Validate a Swedish organisationsnummer (or SE...01 VAT number); returns legal form hint and the derived Swedish VAT number.

  Parameters:

  • value (required) — string — e.g. 556036-0793

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• validate_bankgiro read-only

  Validate and format a Swedish bankgiro number.

  Parameters:

  • value (required) — string — e.g. 5402-9681

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• validate_plusgiro read-only

  Validate and format a Swedish plusgiro number.

  Parameters:

  • value (required) — string — e.g. 123456-6

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• validate_ocr read-only

  Validate a Swedish OCR payment reference (Luhn check digit, optional length digit).

  Parameters:

  • value (required) — string — OCR digits

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• generate_ocr read-only

  Generate a Swedish OCR reference (check digit, optional length digit) from a base number such as an invoice number.

  Parameters:

  • base (required) — string — digits
  • length_digit — string — "true" to add length digit

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• swedish_account_to_iban read-only

  Validate a Swedish national bank account (clearing + account number, Bankgirot checksum rules) and convert it to IBAN using the official Bankinfrastruktur clearing table. Returns bank, BIC, account type, IBAN.

  Parameters:

  • number — string — full account digits, clearing first (optional if clearing+account given)
  • account — string — account number without clearing
  • clearing — string — clearing number (4 digits; 5 for Swedbank 8xxx)

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• validate_iban read-only

  Validate any IBAN (ISO 13616 mod-97 + country length) and identify the bank for Swedish IBANs.

  Parameters:

  • value (required) — string — IBAN, spaces allowed

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• lookup_clearing_number read-only

  Look up bank name, BIC, IBAN id and account type for a Swedish clearing number.

  Parameters:

  • value (required) — string — first 4 digits of the account number

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• swedish_holidays read-only

  List Swedish public holidays, eves and observances for a year (computed).

  Parameters:

  • year — string — 1900-2200

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• swedish_date_info read-only

  Weekday (sv/en), ISO week, holiday names and business-day status for a date. mode=bank treats midsommarafton, julafton and nyårsafton as non-business days.

  Parameters:

  • date (required) — string — YYYY-MM-DD
  • mode — string — bank or work

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• add_business_days read-only

  Add (or subtract) business days to a date using Swedish holidays (e.g. payment due dates).

  Parameters:

  • date (required) — string — YYYY-MM-DD
  • days (required) — string — integer, may be negative
  • mode — string — bank or work

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

• count_business_days read-only

  Count Swedish business days after "from" up to and including "to".

  Parameters:

  • from (required) — string — YYYY-MM-DD
  • to (required) — string — YYYY-MM-DD
  • mode — string — bank or work

  Hints: read-only yes · destructive not declared · idempotent yes · open-world no

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