lexware-mcp-server

MCP server for the Lexware Office API. Manage invoices, contacts, articles, vouchers, and more through the Model Context Protocol.

Unofficial — community project. Not affiliated with, endorsed by, or supported by Lexware GmbH or Haufe Group. "Lexware" and "Lexware Office" are trademarks of their respective owners; used here only to identify the API this client targets (nominative fair use).

64 tools across 20 resource domains, with 6 entry points so you can pick the right server for your MCP client's tool limit.

Installation

npm install -g @lazyants/lexware-mcp-server

Or run directly:

npx @lazyants/lexware-mcp-server

Configuration

Set your Lexware Office API token:

export LEXWARE_API_TOKEN=your-token-here

Get a token from the Lexware Office API settings.

Entry Points

Command	Domains	Tools
lexware-mcp-server	All 20 domains	64
lexware-mcp-sales	Invoices, Credit Notes, Quotations, Order Confirmations, Delivery Notes, Down Payment Invoices, Dunnings, Voucherlist	33
lexware-mcp-contacts	Contacts, Articles	10
lexware-mcp-bookkeeping	Vouchers, Voucherlist, Payments	7
lexware-mcp-reference	Countries, Payment Conditions, Posting Categories, Profile, Print Layouts	5
lexware-mcp-system	Event Subscriptions, Files, Recurring Templates	10

Use split servers to reduce context size — pick only the splits you need.

Claude Code

Add to ~/.claude/settings.json:

{
  "mcpServers": {
    "lexware": {
      "command": "npx",
      "args": ["-y", "@lazyants/lexware-mcp-server"],
      "env": {
        "LEXWARE_API_TOKEN": "your-token-here"
      }
    }
  }
}

Or use split servers (pick the splits you need):

{
  "mcpServers": {
    "lexware-sales": {
      "command": "npx",
      "args": ["-y", "-p", "@lazyants/lexware-mcp-server", "lexware-mcp-sales"],
      "env": { "LEXWARE_API_TOKEN": "your-token-here" }
    },
    "lexware-contacts": {
      "command": "npx",
      "args": ["-y", "-p", "@lazyants/lexware-mcp-server", "lexware-mcp-contacts"],
      "env": { "LEXWARE_API_TOKEN": "your-token-here" }
    }
  }
}

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "lexware": {
      "command": "npx",
      "args": ["-y", "@lazyants/lexware-mcp-server"],
      "env": {
        "LEXWARE_API_TOKEN": "your-token-here"
      }
    }
  }
}

Tools

Invoices (5 tools) — sales

lexware_create_invoice (supports finalize=true at creation), lexware_get_invoice, lexware_download_invoice_file, lexware_pursue_invoice, lexware_deeplink_invoice

Credit Notes (5 tools) — sales

lexware_create_credit_note, lexware_get_credit_note, lexware_download_credit_note_file, lexware_pursue_credit_note, lexware_deeplink_credit_note

Quotations (4 tools) — sales

lexware_create_quotation, lexware_get_quotation, lexware_download_quotation_file, lexware_deeplink_quotation

Order Confirmations (5 tools) — sales

lexware_create_order_confirmation, lexware_get_order_confirmation, lexware_download_order_confirmation_file, lexware_pursue_order_confirmation, lexware_deeplink_order_confirmation

Delivery Notes (5 tools) — sales

lexware_create_delivery_note, lexware_get_delivery_note, lexware_download_delivery_note_file, lexware_pursue_delivery_note, lexware_deeplink_delivery_note

Down Payment Invoices (3 tools) — sales

lexware_get_down_payment_invoice, lexware_download_down_payment_invoice_file, lexware_deeplink_down_payment_invoice

Dunnings (5 tools) — sales

lexware_create_dunning, lexware_get_dunning, lexware_download_dunning_file, lexware_pursue_dunning, lexware_deeplink_dunning

Voucherlist (1 tool) — sales, bookkeeping

lexware_list_voucherlist

Contacts (5 tools) — contacts

lexware_list_contacts, lexware_get_contact, lexware_create_contact, lexware_update_contact, lexware_deeplink_contact

Articles (5 tools) — contacts

lexware_list_articles, lexware_get_article, lexware_create_article, lexware_update_article, lexware_delete_article

Vouchers (5 tools) — bookkeeping

lexware_list_vouchers, lexware_get_voucher, lexware_create_voucher, lexware_update_voucher, lexware_upload_voucher_file

Payments (1 tool) — bookkeeping

lexware_get_payments

Countries (1 tool) — reference

lexware_list_countries

Payment Conditions (1 tool) — reference

lexware_list_payment_conditions

Posting Categories (1 tool) — reference

lexware_list_posting_categories

Profile (1 tool) — reference

lexware_get_profile

Print Layouts (1 tool) — reference

lexware_list_print_layouts

Event Subscriptions (5 tools) — system

lexware_create_event_subscription, lexware_list_event_subscriptions, lexware_get_event_subscription, lexware_delete_event_subscription, lexware_verify_webhook_signature

Files (3 tools) — system

lexware_upload_file, lexware_download_file, lexware_get_file_status

Recurring Templates (2 tools) — system

lexware_list_recurring_templates, lexware_get_recurring_template

Security

• Never commit your API token to version control
• Use read-only access when you only need to list/get resources
• Create, update, and delete tools modify real business data — invoices, contacts, and accounting records in your Lexware account
• Rate limiting is handled automatically (exponential backoff on 429)

Releasing

Releases ship via the GitHub Release event. Maintainer flow:

1. Bump the version in package.json and server.json (npm run check-versions enforces alignment between package.json#/version and server.json#/packages[0].version).
2. Update CHANGELOG.md.
3. Commit, then gh release create vX.Y.Z --notes-from-tag (or write release notes inline).
4. The Publish to npm + MCP Registry workflow runs automatically: it npm publishes with provenance, polls the registry until the tarball is available, then pushes the matching server.json to the MCP Registry via mcp-publisher.

The workflow skips npm publish cleanly if the version is already on npm (cutover guard for releases that were partially published manually).

Required repository secret

NPM_TOKEN must be a granular access token issued from the npm org dashboard (https://www.npmjs.com/settings/lazyants/tokens) with read-and-write permission on @lazyants/lexware-mcp-server. Classic legacy automation tokens silently fail with --provenance since npm's 2024 enforcement.

Disclaimer

This is an unofficial, independent community project. It is not affiliated with, endorsed by, sponsored by, or supported by Lexware GmbH, Haufe Group, or any of their affiliates. For official Lexware support, contact Lexware directly — issues with this MCP server should be reported here, not to Lexware.

"Lexware" and "Lexware Office" are trademarks of their respective owners and are used in this project's name and documentation under nominative fair use, solely to identify the third-party API this client connects to.

Create, update, and delete operations modify real business data in your Lexware account. The authors provide this software "as-is" and accept no responsibility for unintended changes, data loss, or any other damages arising from its use. Test against a sandbox or non-critical account before running write operations against production data.

License

FSL-1.1-MIT — see LICENSE for the full terms.