How to integrate Lexoffice MCP with Hermes

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Introduction

Hermes is a 24/7 autonomous agent that lives on your computer or server — it remembers what it learns and evolves as your usage grows.

This guide explains the easiest and most robust way to connect your Lexoffice account to Hermes. You can do this through either Composio Connect CLI or Composio Connect MCP. For personal use we recommend the CLI, but you won't go wrong with MCP either.

Also integrate Lexoffice with

What is Composio Connect?

Composio Connect is a consumer offering that lets anyone plug 1,000+ applications directly into their agent harness — including Hermes. It can:

  • Search and load tools from relevant toolkits on-demand, reducing context usage.
  • Chain multiple tools to accomplish complex workflows via a remote workbench, without excessive back-and-forth with the LLM.
  • Manage app authentication end-to-end with zero manual overhead.

Integrating Lexoffice with Hermes

Using Composio Connect CLI

1. Install the Composio CLI

Run the install script directly, or paste https://composio.dev/hermes into your Hermes chat box to have it installed for you.

bash
curl -fsSL https://composio.dev/install | bash
Hermes authenticating with Composio

2. Authenticate

Once the CLI is installed, ask Hermes to authenticate with Composio.

3. Connect to Lexoffice

Ask your agent to connect to Lexoffice, or simply request any Lexoffice-related task. Hermes will prompt you to authenticate and authorize access.

4. Done. You're all set with a new Lexoffice connection.

Using Composio Connect MCP

1. Get your MCP URL and API Key

Go to dashboard.composio.dev and copy your Connect MCP URL and API key.

Copy MCP URL and API key from Composio dashboard

2. Open the Hermes config file

bash
nano ~/.hermes/config.yaml

3. Add the Composio Connect MCP server

bash
mcp_servers:
  composio:
    url: "https://connect.composio.dev/mcp"
    headers:
      x-consumer-api-key: "YOUR_COMPOSIO_API_KEY"
    connect_timeout: 60
    timeout: 180

Save with Ctrl + O, Enter, then exit with Ctrl + X.

4. Restart your Hermes agent

Once restarted, ask your agent to connect to Lexoffice or request any Lexoffice-related task. It will prompt you to authenticate and authorize access.

5. Done!

What is the Lexoffice MCP server, and what's possible with it?

The Lexoffice MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Lexoffice account. It provides structured and secure access to your Lexoffice workspace, so your agent can perform actions like managing invoices, tracking expenses, syncing with bank accounts, and handling client records on your behalf.

  • Invoice creation and management: Effortlessly generate, send, and track invoices, helping you streamline your billing process.
  • Expense tracking and categorization: Let your agent log and classify expenses, making it easy to stay on top of your business spending.
  • Bank integration and reconciliation: Automatically sync transactions with your connected bank accounts for simplified reconciliation and financial oversight.
  • Client and contact management: Manage your customer database, update records, and keep client information organized and up to date.
  • Financial reporting and insights: Generate detailed reports on your business’s financial health, including revenue, expenses, and outstanding balances.

Supported Tools & Triggers

Tools
Create ArticleTool to create a new article (product or service) in Lexoffice.
Create contactTool to create a new contact (customer or vendor) in Lexoffice.
Create Credit NoteTool to create a credit note in Lexoffice.
Create Delivery NoteCreate a delivery note in lexoffice.
Create Event SubscriptionTool to register a new webhook for Lexoffice events.
Create Order ConfirmationTool to create an Order Confirmation in Lexoffice/Lexware.
Create QuotationTool to create a quotation in Lexoffice.
Create VoucherTool to create a bookkeeping voucher in Lexoffice.
Delete ArticleTool to permanently delete an article by its ID.
Delete Event SubscriptionTool to delete an event subscription by its ID.
Download FileDownload a file from lexoffice by its ID.
Get ArticleTool to retrieve an article by ID from Lexoffice.
Get ContactTool to retrieve a specific contact by its ID.
Get Credit NoteTool to retrieve a credit note by its UUID from Lexoffice.
Get Credit Note DocumentTool to render a credit note document (PDF).
Get Delivery NoteTool to retrieve a specific delivery note from Lexoffice by its ID.
Get DunningTool to retrieve a dunning document by its ID.
Get Dunning DocumentTool to render and retrieve a dunning document (PDF) reference.
Get Event SubscriptionTool to retrieve a specific event subscription by its ID.
Get InvoiceTool to retrieve a specific invoice by its UUID.
Get Invoice DocumentTool to render an Invoice Document (PDF) by invoice ID.
Get Order ConfirmationTool to retrieve a specific order confirmation by its ID.
Render Order Confirmation DocumentTool to render an Order Confirmation Document as PDF.
Get Payment InformationTool to retrieve payment information for a specific voucher (invoice or credit note) from Lexoffice.
Get ProfileRetrieves the user and company profile information from Lexoffice.
Get QuotationTool to retrieve a quotation by its ID.
Get Quotation DocumentTool to render a quotation document as a PDF file.
Get VoucherTool to retrieve a specific voucher by its UUID.
List ArticlesTool to list articles from Lexoffice using filters and pagination.
List ContactsTool to retrieve all contacts from Lexoffice with optional filters.
List CountriesTool to retrieve the list of all available countries with tax classifications from Lexoffice.
List Event SubscriptionsTool to retrieve all event subscriptions for the current access token.
List Payment ConditionsTool to retrieve list of currently configured payment conditions from Lexoffice.
List Posting CategoriesTool to retrieve the list of posting categories for bookkeeping vouchers (revenue or expense) supported in lexoffice.
List Print LayoutsTool to retrieve all print layouts for invoices and other documents.
List Recurring TemplatesTool to retrieve all recurring templates from Lexoffice.
List VoucherlistTool to retrieve voucherlist from Lexoffice including bookkeeping vouchers (salesinvoices, salescreditnotes), invoices, credit notes, order confirmations, quotations, and delivery notes.
List VouchersTool to filter vouchers by voucher number from Lexoffice.
Update ArticleTool to update an existing article in Lexoffice with new data.
Update lexoffice contactTool to update an existing contact in lexoffice.
Upload Voucher FileTool to upload and assign files (PDF or image) to a specific voucher in lexoffice.

Way Forward

With Lexoffice connected, Hermes can now act on your behalf whenever it detects a relevant task or you ask it to.

From here, you can extend Hermes further:

  • Connect more apps: Calendar, Slack, Notion, Linear, and hundreds of others are available through the same Composio Connect setup. Each new integration compounds what Hermes can do for you.
  • Build workflows across tools: Once multiple apps are connected, Hermes can chain actions together — turn an email into a calendar invite, a Slack message into a Linear ticket, or a meeting note into a follow-up draft.
  • Let it learn your patterns: The more you use Hermes, the better it gets at anticipating how you'd handle recurring tasks. Give it feedback on drafts and decisions, and it will adapt.

If you run into trouble or want to share what you've built, join the community or check out the Docs for deeper configuration options.

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FAQ

What are the differences in Tool Router MCP and Lexoffice MCP?

With a standalone Lexoffice MCP server, the agents and LLMs can only access a fixed set of Lexoffice tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Lexoffice and many other apps based on the task at hand, all through a single MCP endpoint.

Can I use Tool Router MCP with Hermes?

Yes, you can. Hermes fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Lexoffice tools.

Can I manage the permissions and scopes for Lexoffice while using Tool Router?

Yes, absolutely. You can configure which Lexoffice scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Lexoffice data and credentials are handled as safely as possible.

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