Lexware

Name: Lexware
Author: lazyants

by lazyantsversion 5.4.0i★ –iRuns on your computer

Registry nameio.github.lazyants/lexware

Install

Overview

Description from the maker (original English)

MCP server for the Lexware Office API — invoices, contacts, articles, and vouchers.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Docs, sheets & office work
You need to fill in: LEXWARE_API_TOKEN

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: LEXWARE_API_TOKEN, LEXWARE_KEYRING_SERVICE, LEXWARE_READ_ONLY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

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

Run this in your terminal

claude mcp add lexware --env LEXWARE_API_TOKEN=your-value --env LEXWARE_KEYRING_SERVICE=your-value --env LEXWARE_READ_ONLY=your-value -- npx -y @lazyants/lexware-mcp-server

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "lexware": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@lazyants/lexware-mcp-server"
      ],
      "env": {
        "LEXWARE_API_TOKEN": "your-value",
        "LEXWARE_KEYRING_SERVICE": "your-value",
        "LEXWARE_READ_ONLY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

LEXWARE_API_TOKEN secret env
Lexware Office API token; required when no token is stored in the OS keyring.
LEXWARE_KEYRING_SERVICE env
OS keyring service containing the API token.
LEXWARE_READ_ONLY env
Set to true or 1 to block every tool that changes Lexware data; unset, empty, false or 0 leaves it off.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account lazyants, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Docs, sheets & office worki

More stars than 0% of the other 2188 servers in this category
Published to the registry more recently than 73% of the other 2188 servers in this category
Basic checks equal to or better than 100% of the other 2188 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Lexware safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: LEXWARE_API_TOKEN

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (5.4.0) reached the registry 11 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Agent-Native Calendar, Excel MCP Server, MCP Server for Excel

Alternatives

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Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

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 Lexware GmbH or Haufe Group. See the Disclaimer.

Requirements

Node.js 20 or newer.
A Lexware Office API token from the Lexware Office API settings.

Quick start

1. Store the token in the OS keyring

The server reads the token from the OS keyring first (service lexware-mcp, account api-token) and falls back to the LEXWARE_API_TOKEN environment variable. The keyring is recommended: your MCP config then holds no credentials.

The commands below prompt for the token, so it never lands in your shell history or the process list.

macOS:

security add-generic-password -s "lexware-mcp" -a "api-token" -w

Linux (needs a Secret Service / libsecret):

secret-tool store --label="Lexware Office API" service lexware-mcp username api-token

For Windows, headless machines, and the environment-variable fallback, see the configuration guide.

2. Add the server to your MCP client

"mcpServers": { "lexware": { "command": "npx", "args": ["-y", "@lazyants/lexware-mcp-server"] } } }

Put this in your client's MCP configuration, for example claude_desktop_config.json for Claude Desktop. In Claude Code, run:

claude mcp add --scope user lexware -- npx -y @lazyants/lexware-mcp-server

npx downloads and runs the package; no separate install is needed. Restart the client, and the Lexware tools appear in its tool list.

Entry points

The package provides a full server and smaller split servers that each cover one area. Use a split server to reduce context size or to stay under your MCP client's tool limit.

Command	Covers
`lexware-mcp-server`	Everything below
`lexware-mcp-sales`	Invoices, Credit Notes, Quotations, Order Confirmations, Delivery Notes, Down Payment Invoices, Dunnings, Voucherlist
`lexware-mcp-contacts`	Contacts, Articles
`lexware-mcp-bookkeeping`	Vouchers, Voucherlist, Payments
`lexware-mcp-reference`	Countries, Payment Conditions, Posting Categories, Profile, Print Layouts
`lexware-mcp-system`	Event Subscriptions, Files, Recurring Templates

Run a split server with npx -y -p @lazyants/lexware-mcp-server lexware-mcp-sales. The configuration guide has client examples for split servers and for several Lexware accounts.

What the tools do

Tool names follow lexware_ _ , for example lexware_create_invoice or lexware_list_voucherlist. They create and read sales vouchers such as invoices and quotations, manage contacts and articles, record bookkeeping vouchers, search across voucher types, upload and download files, and manage webhook subscriptions. Your MCP client's tool list, with each tool's description and input schema, is the authoritative inventory.

Every entry point also serves a read-only MCP resource, reference://lexware/api, with API conventions, text formatting rules, and webhook guidance.

The usage guide explains the API caveats: finalizing at creation, voucher search filters, voucher updates, file uploads and downloads, and webhooks.

Security

Use the OS keyring and never commit your API token to version control.
Create, update, delete, upload, and pursue tools change real business data in your Lexware account. A pursue tool creates a follow-up document.
Set LEXWARE_READ_ONLY=true to make the server refuse every tool that changes data. See Read-only mode.
Without read-only mode, two things stop unintended changes: the permissions of your Lexware API token, which Lexware enforces, and your MCP client's approval prompts. Tool annotations such as readOnlyHint are hints for the client, not checks.
Split servers offer fewer tools, but most of them still include tools that change data. For a conservative setup, see Limit what the server can change.
Requests that hit the rate limit (HTTP 429) are retried automatically with exponential backoff.

To report a vulnerability, see SECURITY.md.

Documentation

Configuration — keyring setup for macOS, Windows, and Linux; environment variables; Claude Code and Claude Desktop; split servers and multiple accounts; limiting what the server can change.
Usage notes — API behavior and caveats.
Releasing — maintainer release procedure.
Changelog

Releasing

Maintainers: follow the release guide. Never create a release with a bare gh release create; the guide's guarded tag sequence explains why and prevents republishing an old version.

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.

Lexware

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Docs, sheets & office worki

Common questions

Alternatives

Agent-Native Calendar

Excel MCP Server

MCP Server for Excel

README from the maker

lexware-mcp-server

Requirements

Quick start

1. Store the token in the OS keyring

2. Add the server to your MCP client

Entry points

What the tools do

Security

Documentation

Releasing

Disclaimer

License