Lexware Office MCP Server
@JannikWempe
About Lexware Office MCP Server
MCP server to interact with Lexware Office
Config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"mcp-lexware-office": {
"command": "docker",
"args": [
"run",
"-i",
"--rm",
"-e",
"LEXWARE_OFFICE_API_KEY",
"mcp-lexware-office"
],
"env": {
"LEXWARE_OFFICE_API_KEY": "YOUR_API_KEY_HERE"
}
}
}
}Tools
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Overview
What is Lexware Office MCP Server?
An MCP server for Lexware Office (formerly Lexoffice) that enables MCP-capable assistants to query and manage contacts, sales documents, vouchers, files, payments, webhooks, and reference data through the Lexware Office public API. It offers two entrypoints: a stable v1 with many endpoint-shaped tools and a preview v2 with two Code Mode tools (search and execute).
How to use Lexware Office MCP Server?
Requires Node.js 22+ and the LEXWARE_OFFICE_API_KEY environment variable. Configure your MCP client (e.g., Claude Desktop) to start one of the two entrypoints via npx, Docker, or local TypeScript source. For v2, write safety is read-only by default unless LEXWARE_OFFICE_ALLOW_WRITES=true is set.
Key features of Lexware Office MCP Server
- Broad Lexware Office API coverage for read and write workflows.
- Sales documents: invoices, quotations, credit notes, delivery notes, and more.
- Contact management: create, read, and update customers and vendors.
- Bookkeeping: vouchers, posting categories, payments, and file uploads.
- Webhooks: create, list, inspect, and delete event subscriptions.
- v2 Code Mode with sandboxed JavaScript execution for complex workflows.
Use cases of Lexware Office MCP Server
- Automate invoice creation and finalization from an AI assistant.
- Manage customer and vendor contacts programmatically.
- Upload and attach vouchers and files to bookkeeping records.
- Query and update reference data like countries and payment conditions.
- Set up and manage webhook subscriptions for event-driven integrations.
FAQ from Lexware Office MCP Server
What is the difference between v1 and v2 entrypoints?
v1 is the stable legacy server with many endpoint-shaped tools (e.g., get-contacts, create-invoice). v2 is a preview with two Code Mode tools—search and execute—that run sandboxed JavaScript against a curated API catalog. v2 is intended to replace v1 in the future.
What are the runtime requirements?
Node.js 22 or higher and a LEXWARE_OFFICE_API_KEY environment variable. The server can be run via npx, Docker, or from TypeScript source with tsx.
How does write safety work in v2?
v2 is read-only by default. POST, PUT, PATCH, and DELETE requests are blocked. Set LEXWARE_OFFICE_ALLOW_WRITES=true to enable writes, but LEXWARE_OFFICE_READ_ONLY=true remains a hard block that overrides any write permission.
How do I upload binary files in v2?
In v2, binary-safe uploads are supported via bodyBase64 (raw binary body) or multipart with contentBase64 (binary FormData parts). The host decodes base64 and builds the binary body outside the sandbox.
What should I do if npx fails with a --before error?
The error can occur if your npm user config has minimum-release-age. Fix by bypassing user config: NPM_CONFIG_USERCONFIG=/dev/null npx ... or permanently remove the setting with npm config delete minimum-release-age --location=user.
Frequently asked questions
What is the difference between v1 and v2 entrypoints?
v1 is the stable legacy server with many endpoint-shaped tools (e.g., `get-contacts`, `create-invoice`). v2 is a preview with two Code Mode tools—`search` and `execute`—that run sandboxed JavaScript against a curated API catalog. v2 is intended to replace v1 in the future.
What are the runtime requirements?
Node.js 22 or higher and a `LEXWARE_OFFICE_API_KEY` environment variable. The server can be run via `npx`, Docker, or from TypeScript source with `tsx`.
How does write safety work in v2?
v2 is read-only by default. POST, PUT, PATCH, and DELETE requests are blocked. Set `LEXWARE_OFFICE_ALLOW_WRITES=true` to enable writes, but `LEXWARE_OFFICE_READ_ONLY=true` remains a hard block that overrides any write permission.
How do I upload binary files in v2?
In v2, binary-safe uploads are supported via `bodyBase64` (raw binary body) or `multipart` with `contentBase64` (binary FormData parts). The host decodes base64 and builds the binary body outside the sandbox.
What should I do if `npx` fails with a `--before` error?
The error can occur if your npm user config has `minimum-release-age`. Fix by bypassing user config: `NPM_CONFIG_USERCONFIG=/dev/null npx ...` or permanently remove the setting with `npm config delete minimum-release-age --location=user`.
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