# io.usefulapi/sevdesk (remote · sevdesk.usefulapi.io)

Look up contacts, invoices, vouchers, orders, bank transactions and parts, and create drafts.

- Trust score: 76/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-04

## Components

- remote · `sevdesk.usefulapi.io`: 76/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-sevdesk/sevdesk.md), [page](https://verifymcp.io/servers/io-usefulapi-sevdesk/sevdesk)

## Channel facts

- Endpoint: `https://sevdesk.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-04.

- **Endpoint Security**: 89/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 3802 tokens (~190/item across 20 items; 20 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 13/100
  - Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 20 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 20 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the io.usefulapi/sevdesk MCP server?

io.usefulapi/sevdesk is a hosted endpoint at https://sevdesk.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http io-usefulapi-sevdesk 'https://sevdesk.usefulapi.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-usefulapi-sevdesk": {
      "url": "https://sevdesk.usefulapi.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-usefulapi-sevdesk": {
      "type": "http",
      "url": "https://sevdesk.usefulapi.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-usefulapi-sevdesk]
url = "https://sevdesk.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-sevdesk": {
      "type": "remote",
      "url": "https://sevdesk.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-sevdesk --url 'https://sevdesk.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-sevdesk:
    url: "https://sevdesk.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-sevdesk": {
      "Transport": "http",
      "Url": "https://sevdesk.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-sevdesk -t streamable-http -u 'https://sevdesk.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-sevdesk": {
      "type": "http",
      "url": "https://sevdesk.usefulapi.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-03 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-02 (score 75, 0)

- [functional] Server version: 1.3.0 → 1.5.1

### 2026-10-01 (score 75, +5)

- [security improvement] HTTPS: unverified → pass
- [functional improvement] Stability: unverified → 0.03
- [functional] Server version: 1.0.0 → 1.3.0

### 2026-09-30 (score 70, +52)

- [security improvement] Authorization: unverified → pass
- [security improvement] Injection markers: unverified → pass
- [security improvement] Transport: fail → pass
- [security] First check of Judged manipulation: pass
- [security] First check of Authorization: partial
- [functional regression] MCP protocol: unverified → fail
- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: excellent
- [functional] First check of Destructive annotations: pass
- [functional] First check of Schema quality: fail
- [functional] First check of Tool coverage: 100

### 2026-09-29 (score 18)

First indexed and scored.

## MCP tools (20)

### `sevdesk_get_bookkeeping_system_version` (~66 tokens)

Get the bookkeeping system version

Return whether the account runs sevdesk bookkeeping 1.0 or 2.0 (2.0 uses taxRule instead of taxType on invoices). Also a cheap way to confirm the API token works. sevdesk: GET /Tools/bookkeepingSystemVersion.

### `sevdesk_list_contacts` (~262 tokens)

List contacts

List contacts (customers, suppliers, partners, prospects). By default sevdesk returns only organisations; set include_persons to also get individual persons. sevdesk: GET /Contact.

Input parameters:

- `category_id` (integer): Only contacts in this category: 2 Supplier, 3 Customer, 4 Partner, 28 Prospect customer.
- `city` (string): Only contacts in this city.
- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `customer_number` (string): Only the contact with this customer number.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `include_persons` (boolean): If true, return organisations AND persons (sevdesk depth=1). Default: organisations only.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `name` (string): Only contacts whose name, first name or last name matches.
- `offset` (integer): Number of entries to skip, for paging.
- `parent_id` (integer): Only persons belonging to this parent organisation's id.
- `zip` (string): Only contacts with this ZIP code.

### `sevdesk_get_contact` (~62 tokens)

Get one contact

Fetch a single contact by id. sevdesk: GET /Contact/{contactId}.

Input parameters:

- `contact_id` (integer, required): The contact's numeric id.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.

### `sevdesk_list_communication_ways` (~165 tokens)

List contact emails, phones and websites

List communication ways (email addresses, phone and mobile numbers, websites), optionally for one contact. sevdesk: GET /CommunicationWay.

Input parameters:

- `contact_id` (integer): Only this contact's communication ways.
- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `main_only` (boolean): If true, only the main communication way(s).
- `offset` (integer): Number of entries to skip, for paging.
- `type` (string): Only this type.

### `sevdesk_list_communication_way_keys` (~70 tokens)

List communication way keys

List the labels a communication way can carry (1 Privat, 2 Arbeit, 3 Fax, 4 Mobil, 6 Autobox, 7 Newsletter, 8 Rechnungsadresse). Needed for sevdesk_add_communication_way. sevdesk: GET /CommunicationWayKey.

### `sevdesk_list_invoices` (~282 tokens)

List invoices

List invoices, filterable by status, number, date range and contact. Status: 50 deactivated recurring, 100 draft, 200 open/due, 750 partially paid, 1000 paid. sevdesk: GET /Invoice.

Input parameters:

- `contact_id` (integer): Only invoices for this contact id.
- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `delinquent` (boolean): If true, only overdue (delinquent) invoices.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `end_date` (integer): Only invoices dated on or before this, as a Unix timestamp in seconds.
- `invoice_number` (string): Only the invoice with this number.
- `invoice_type` (string): Only this type: RE normal, WKR recurring, SR cancellation, MA reminder, TR partial, AR advance, ER final.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `offset` (integer): Number of entries to skip, for paging.
- `start_date` (integer): Only invoices dated on or after this, as a Unix timestamp in seconds.
- `status` (string): Only invoices with this status code.

### `sevdesk_get_invoice` (~73 tokens)

Get one invoice

Fetch a single invoice by id — totals, status, dates, contact and contact person. sevdesk: GET /Invoice/{invoiceId}.

Input parameters:

- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `invoice_id` (integer, required): The invoice's numeric id.

### `sevdesk_get_invoice_positions` (~121 tokens)

Get an invoice's line items

List the positions (line items) of one invoice: name, quantity, price, tax rate, sums. sevdesk: GET /Invoice/{invoiceId}/getPositions.

Input parameters:

- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `invoice_id` (integer, required): The invoice's numeric id.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `offset` (integer): Number of entries to skip, for paging.

### `sevdesk_list_vouchers` (~255 tokens)

List vouchers (receipts)

List vouchers — receipts and incoming/outgoing bills. Status: 50 draft, 100 unpaid/due, 1000 paid. credit_debit C = credit (revenue), D = debit (expense). sevdesk: GET /Voucher.

Input parameters:

- `contact_id` (integer): Only vouchers for this contact id.
- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `credit_debit` (string): C for credit (revenue) or D for debit (expense) vouchers.
- `description_like` (string): Only vouchers whose description contains this text.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `end_date` (integer): Only vouchers dated on or before this, as a Unix timestamp in seconds.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `offset` (integer): Number of entries to skip, for paging.
- `start_date` (integer): Only vouchers dated on or after this, as a Unix timestamp in seconds.
- `status` (string): Only vouchers with this status code.

### `sevdesk_get_voucher` (~66 tokens)

Get one voucher

Fetch a single voucher (receipt) by id. sevdesk: GET /Voucher/{voucherId}.

Input parameters:

- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `voucher_id` (integer, required): The voucher's numeric id.

### `sevdesk_list_credit_notes` (~237 tokens)

List credit notes

List credit notes (Gutschriften), filterable by status, number, date range and contact. Status: 100 draft, 200 open/delivered, 750 partially paid, 1000 paid. sevdesk: GET /CreditNote.

Input parameters:

- `contact_id` (integer): Only credit notes for this contact id.
- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `credit_note_number` (string): Only the credit note with this number.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `end_date` (integer): Only credit notes dated on or before this, as a Unix timestamp in seconds.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `offset` (integer): Number of entries to skip, for paging.
- `start_date` (integer): Only credit notes dated on or after this, as a Unix timestamp in seconds.
- `status` (string): Only credit notes with this status code.

### `sevdesk_list_orders` (~241 tokens)

List orders and quotes

List orders — quotes (Angebote), order confirmations and delivery notes — filterable by status, number, date range and contact. Status: 100 draft, 200 delivered, 300 rejected, 500 accepted, 750 partially calculated, 1000 calculated. sevdesk: GET /Order.

Input parameters:

- `contact_id` (integer): Only orders for this contact id.
- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `end_date` (integer): Only orders dated on or before this, as a Unix timestamp in seconds.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `offset` (integer): Number of entries to skip, for paging.
- `order_number` (string): Only the order with this number.
- `start_date` (integer): Only orders dated on or after this, as a Unix timestamp in seconds.
- `status` (string): Only orders with this status code.

### `sevdesk_list_parts` (~149 tokens)

List parts (products)

List parts — the products and services in the sevdesk inventory, with prices, tax rate and stock. sevdesk: GET /Part.

Input parameters:

- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `name` (string): Only parts with this name.
- `offset` (integer): Number of entries to skip, for paging.
- `part_number` (string): Only the part with this part number.

### `sevdesk_list_check_accounts` (~131 tokens)

List payment accounts

List check accounts — the bank accounts, cash registers and clearing accounts sevdesk tracks payments on, with IBAN, type and sync status. sevdesk: GET /CheckAccount.

Input parameters:

- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `offset` (integer): Number of entries to skip, for paging.

### `sevdesk_get_check_account_balance` (~106 tokens)

Get a payment account's balance at a date

Balance of one check account as the sum of every transaction sevdesk knows up to and including the given date. May differ from the real bank balance if older transactions were never imported. sevdesk: GET /CheckAccount/{checkAccountId}/getBalanceAtDate.

Input parameters:

- `check_account_id` (integer, required): The check account's numeric id.
- `date` (string, required): Consider transactions up to this date (YYYY-MM-DD, inclusive to 23:59:59).

### `sevdesk_list_transactions` (~292 tokens)

List bank transactions

List check-account transactions (bank payments in and out), filterable by account, booking state, date range, payee/payer and purpose. sevdesk: GET /CheckAccountTransaction.

Input parameters:

- `check_account_id` (integer): Only transactions on this check account id.
- `count_all` (boolean): If true, the response also carries `total`, the full match count.
- `embed` (string): Comma-separated nested resources to expand inline, e.g. contact,category.
- `end_date` (string): Only transactions up to this date (ISO 8601).
- `is_booked` (boolean): If true, only transactions already booked against a document.
- `limit` (integer): Max entries to return, 1-1000 (sevdesk suggests 10-100).
- `offset` (integer): Number of entries to skip, for paging.
- `only_credit` (boolean): If true, only incoming (credit) transactions.
- `only_debit` (boolean): If true, only outgoing (debit) transactions.
- `payee_payer_name` (string): Only transactions with this payee / payer name.
- `payment_purpose` (string): Only transactions with this payment purpose (Verwendungszweck).
- `start_date` (string): Only transactions from this date on (ISO 8601, e.g. 2026-01-01).

### `sevdesk_create_contact` (~263 tokens)

Create a contact

Create a contact. Give `name` for an organisation, or `surename`/`familyname` for a person. Addresses and emails are separate (use sevdesk_add_communication_way). sevdesk: POST /Contact.

Input parameters:

- `category_id` (integer, required): Required category: 2 Supplier, 3 Customer, 4 Partner, 28 Prospect customer.
- `customer_number` (string): Customer number. Omit to let sevdesk leave it unset.
- `default_time_to_pay` (integer): Default payment term in days for this contact's invoices.
- `description` (string): Free-text description.
- `familyname` (string): Last name of a PERSON.
- `name` (string): Organisation name. Setting it makes the contact an ORGANISATION — leave empty for a person.
- `parent_id` (integer): For a person: the id of the organisation they belong to.
- `status`: 100 Lead, 500 Pending, 1000 Active.
- `surename` (string): First name of a PERSON (sevdesk's field is really spelled 'surename').
- `tax_number` (string): Tax number (Steuernummer).
- `vat_number` (string): VAT id (USt-IdNr.).

### `sevdesk_update_contact` (~254 tokens)

Update a contact

Update fields on an existing contact; only the fields you pass are sent. sevdesk: PUT /Contact/{contactId}.

Input parameters:

- `category_id` (integer): Move to category: 2 Supplier, 3 Customer, 4 Partner, 28 Prospect.
- `contact_id` (integer, required): The contact's numeric id.
- `customer_number` (string): Customer number. Omit to let sevdesk leave it unset.
- `default_time_to_pay` (integer): Default payment term in days for this contact's invoices.
- `description` (string): Free-text description.
- `familyname` (string): Last name of a PERSON.
- `name` (string): Organisation name. Setting it makes the contact an ORGANISATION — leave empty for a person.
- `parent_id` (integer): For a person: the id of the organisation they belong to.
- `status`: 100 Lead, 500 Pending, 1000 Active.
- `surename` (string): First name of a PERSON (sevdesk's field is really spelled 'surename').
- `tax_number` (string): Tax number (Steuernummer).
- `vat_number` (string): VAT id (USt-IdNr.).

### `sevdesk_add_communication_way` (~151 tokens)

Add an email, phone or website to a contact

Attach an email address, phone/mobile number or website to a contact. key_id labels it (2 Arbeit/work is a good default; see sevdesk_list_communication_way_keys). sevdesk: POST /CommunicationWay.

Input parameters:

- `contact_id` (integer, required): The contact's numeric id.
- `key_id` (integer): Communication way key id (1 Privat, 2 Arbeit, 3 Fax, 4 Mobil, 8 Rechnungsadresse). Default 2.
- `main` (boolean): Make this the contact's main communication way of its type.
- `type` (string, required): What kind of value this is.
- `value` (string, required): The email address, number or URL.

### `sevdesk_create_draft_invoice` (~556 tokens)

Create a draft invoice

Create a normal invoice (type RE) with its line items, ALWAYS saved as a DRAFT (status 100): it is not sent, not booked and stays editable in sevdesk. contact_person_id is the sevdesk USER responsible for it — copy contactPerson.id from any existing invoice (sevdesk_get_invoice). Bookkeeping 2.0 accounts use tax_rule_id (1 = taxable sales in Germany, the usual choice); 1.0 accounts pass tax_type instead (check sevdesk_get_bookkeeping_system_version). sevdesk: POST /Invoice/Factory/saveInvoice.

Input parameters:

- `address` (string): Complete recipient address with line breaks. Omit to leave it empty.
- `address_country_id` (integer): sevdesk StaticCountry id of the billing address (1 = Germany). Default 1.
- `contact_id` (integer, required): The contact (customer)'s numeric id.
- `contact_person_id` (integer, required): Id of the sevdesk user (SevUser) acting as contact person — e.g. contactPerson.id of an existing invoice.
- `currency` (string): ISO-4217 currency code. Default EUR.
- `customer_internal_note` (string): Reference / order number field.
- `delivery_date` (string): Delivery / service date as dd.mm.yyyy (must not be after invoice_date for a normal invoice).
- `foot_text` (string): Text below the line items (some HTML allowed).
- `head_text` (string): Text above the line items (some HTML allowed).
- `header` (string): Invoice header/title line.
- `invoice_date` (string, required): Invoice date as dd.mm.yyyy.
- `positions` (array, required): Line items (at least one).
- `show_net` (boolean): If true (default), position prices are net.
- `small_settlement` (boolean): True if the account uses the small-business scheme (no VAT).
- `tax_rule_id` (string): Bookkeeping 2.0 VAT rule id. 1 taxable sales (Umsatzsteuerpflichtige Umsätze), 2 exports, 3 intra-EU supplies, 4 tax-free §4 UStG, 5 reverse charge §13b, 11 small business §19 (Kleinunternehmer), 17…
- `tax_text` (string): VAT text printed on the invoice. Default 'Umsatzsteuer 19%'.
- `tax_type` (string): Bookkeeping 1.0 only — leave unset on 2.0 accounts.
- `time_to_pay` (integer): Payment term in days.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-sevdesk/sevdesk#diagnostics

## Score history

- 2026-10-04: 76
- 2026-10-03: 76
- 2026-10-02: 75
- 2026-10-01: 75
- 2026-09-30: 70
- 2026-09-29: 18

## Common questions

### What is the io.usefulapi/sevdesk MCP server?

io.usefulapi/sevdesk is an MCP server listed in the public MCP registry as io.usefulapi/sevdesk. Look up contacts, invoices, vouchers, orders, bank transactions and parts, and create drafts. This page covers its hosted endpoint (https://sevdesk.usefulapi.io/mcp).

### Is the io.usefulapi/sevdesk MCP server safe to use?

io.usefulapi/sevdesk scores 76 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the io.usefulapi/sevdesk MCP server expose?

io.usefulapi/sevdesk exposes 20 tools: sevdesk_get_bookkeeping_system_version, sevdesk_list_contacts, sevdesk_get_contact, sevdesk_list_communication_ways, sevdesk_list_communication_way_keys, and 15 more. Their descriptions and schemas cost roughly 3,802 tokens of context every time the server is loaded.

### Does the io.usefulapi/sevdesk MCP server require authentication?

Yes. io.usefulapi/sevdesk asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the io.usefulapi/sevdesk MCP server still maintained?

io.usefulapi/sevdesk is still listed as active in the MCP registry. We last reached this channel on 4 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://sevdesk.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-sevdesk/sevdesk.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-sevdesk/sevdesk.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-sevdesk/sevdesk