# How to integrate Lexoffice MCP with Atomic Agent

```json
{
  "title": "How to integrate Lexoffice MCP with Atomic Agent",
  "toolkit": "Lexoffice",
  "toolkit_slug": "lexoffice",
  "framework": "Atomic Agent",
  "framework_slug": "atomic-agent",
  "url": "https://composio.dev/toolkits/lexoffice/framework/atomic-agent",
  "markdown_url": "https://composio.dev/toolkits/lexoffice/framework/atomic-agent.md",
  "updated_at": "2026-08-11T13:11:42.730Z"
}
```

## Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including Lexoffice.
This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a Lexoffice account. See the [Atomic Agent documentation](https://atomicagent.io/docs/?cta_placement=atomic-agent-docs) for installation instructions.

## Also integrate Lexoffice with

- [OpenAI Agents SDK](https://composio.dev/toolkits/lexoffice/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/lexoffice/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/lexoffice/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/lexoffice/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/lexoffice/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/lexoffice/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/lexoffice/framework/hermes-agent)
- [Google ADK](https://composio.dev/toolkits/lexoffice/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/lexoffice/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/lexoffice/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/lexoffice/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/lexoffice/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/lexoffice/framework/crew-ai)
- [Pydantic AI](https://composio.dev/toolkits/lexoffice/framework/pydantic-ai)
- [AutoGen](https://composio.dev/toolkits/lexoffice/framework/autogen)

## TL;DR

### How Atomic Agent connects to Lexoffice
Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.
Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

## Connect Lexoffice to Atomic Agent

### Connect Lexoffice to Atomic Agent
- Sign up or sign in to the [Composio dashboard](https://dashboard.composio.dev/?cta_placement=atomic-agent-api-key). Copy your API key.
- In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
- Ask Atomic Agent to do something in Lexoffice. It searches Composio for the right tool.
- On first use, open the sign-in link returned in the chat. Connect your Lexoffice account, then return to Atomic Agent to continue.
### Headless setup
Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

```bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY
```

## 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

| Tool slug | Name | Description |
|---|---|---|
| `LEXOFFICE_CREATE_ARTICLE` | Create Article | Tool to create a new article (product or service) in Lexoffice. Use when you need to add items to the product/service catalog for invoicing or quotations. The leadingPrice field must be uppercase (NET or GROSS). |
| `LEXOFFICE_CREATE_CONTACT` | Create contact | Tool to create a new contact (customer or vendor) in Lexoffice. Use when you need to add a new business contact. Either company or person details must be provided, and at least one role (customer/vendor) must be assigned. |
| `LEXOFFICE_CREATE_CREDIT_NOTE` | Create Credit Note | Tool to create a credit note in Lexoffice. Credit notes are created in draft mode by default; set finalize=true to create with status 'open'. Use when you need to issue a refund or credit for an invoice. Maximum 300 line items per credit note. |
| `LEXOFFICE_CREATE_DELIVERY_NOTE` | Create Delivery Note | Create a delivery note in lexoffice. Delivery notes are created in draft mode by default (set finalize=true for open status). Use when shipping goods or providing services and need to document what was delivered without prices/payment terms. Maximum 300 line items allowed per delivery note. |
| `LEXOFFICE_CREATE_EVENT_SUBSCRIPTION` | Create Event Subscription | Tool to register a new webhook for Lexoffice events. Use when you need to receive real-time notifications for specific events like invoice creation, contact changes, or payment updates. |
| `LEXOFFICE_CREATE_ORDER_CONFIRMATION` | Create Order Confirmation | Tool to create an Order Confirmation in Lexoffice/Lexware. Order confirmations are always created in draft mode and do not need to be finalized. Use when you need to confirm a customer order with line items, pricing, and shipping details. |
| `LEXOFFICE_CREATE_QUOTATION` | Create Quotation | Tool to create a quotation in Lexoffice. Quotations are created in draft mode by default. Use the finalize parameter to create a finalized quotation with status 'open'. Requires address with either contactId or name+countryCode, line items, total pricing, and tax conditions. |
| `LEXOFFICE_CREATE_VOUCHER` | Create Voucher | Tool to create a bookkeeping voucher in Lexoffice. Use when you need to create expense receipts, sales invoices, purchase invoices, or other accounting vouchers. The voucher requires line items with amounts, tax rates, and posting category IDs. |
| `LEXOFFICE_DELETE_ARTICLE` | Delete Article | Tool to permanently delete an article by its ID. Returns success confirmation on 204, or raises error if article not found (404). |
| `LEXOFFICE_DELETE_EVENT_SUBSCRIPTION` | Delete Event Subscription | Tool to delete an event subscription by its ID. Use when you need to remove an existing event subscription from Lexoffice. |
| `LEXOFFICE_DOWNLOAD_FILE` | Download File | Download a file from lexoffice by its ID. Use this to retrieve PDF documents, images, or XML files associated with invoices, vouchers, or other records. The file format returned depends on the Accept header specified. |
| `LEXOFFICE_GET_ARTICLE` | Get Article | Tool to retrieve an article by ID from Lexoffice. Use when you need to fetch details of a specific article including its price, type, and other metadata. |
| `LEXOFFICE_GET_CONTACT` | Get Contact | Tool to retrieve a specific contact by its ID. Use when you need to fetch detailed information about a contact. |
| `LEXOFFICE_GET_CREDIT_NOTE` | Get Credit Note | Tool to retrieve a credit note by its UUID from Lexoffice. Use when you need to fetch details of a specific credit note. Credit notes can be in draft or finalized (open) mode. |
| `LEXOFFICE_GET_CREDIT_NOTE_DOCUMENT` | Get Credit Note Document | Tool to render a credit note document (PDF). Use to trigger PDF document file rendering for credit notes in status 'open'. Note: This endpoint only works for credit notes that have been finalized (status 'open'), not for draft credit notes. |
| `LEXOFFICE_GET_DELIVERY_NOTE` | Get Delivery Note | Tool to retrieve a specific delivery note from Lexoffice by its ID. Use when you need to fetch complete details of a delivery note including address, line items, and tax information. |
| `LEXOFFICE_GET_DUNNING` | Get Dunning | Tool to retrieve a dunning document by its ID. Use when you need to fetch details of a specific dunning from Lexoffice. |
| `LEXOFFICE_GET_DUNNING_DOCUMENT` | Get Dunning Document | Tool to render and retrieve a dunning document (PDF) reference. Triggers the PDF document file rendering for newly created dunnings. Use when you need to get the document file ID for a specific dunning to download or reference the PDF. |
| `LEXOFFICE_GET_EVENT_SUBSCRIPTION` | Get Event Subscription | Tool to retrieve a specific event subscription by its ID. Use when you need to get details about an existing event subscription. |
| `LEXOFFICE_GET_INVOICE` | Get Invoice | Tool to retrieve a specific invoice by its UUID. Use when you need to fetch detailed information about an invoice including line items, pricing, and payment terms. |
| `LEXOFFICE_GET_INVOICE_DOCUMENT` | Get Invoice Document | Tool to render an Invoice Document (PDF) by invoice ID. Use when you need to generate or retrieve the PDF document reference for an invoice that is in 'open' status. This triggers the PDF rendering process and returns a document file ID that can be used to download the actual PDF file. |
| `LEXOFFICE_GET_ORDER_CONFIRMATION` | Get Order Confirmation | Tool to retrieve a specific order confirmation by its ID. Use when you need to fetch the complete details of an order confirmation including line items, pricing, addresses, and payment terms. |
| `LEXOFFICE_GET_ORDER_CONFIRMATION_DOCUMENT` | Render Order Confirmation Document | Tool to render an Order Confirmation Document as PDF. Use when you need to trigger PDF document rendering for a specific order confirmation by providing its ID. Returns a document file reference that can be used to retrieve the rendered PDF. |
| `LEXOFFICE_GET_PAYMENT` | Get Payment Information | Tool to retrieve payment information for a specific voucher (invoice or credit note) from Lexoffice. Use when you need to check payment status, outstanding amounts, or view payment transaction details for bookkeeping or sales vouchers. |
| `LEXOFFICE_GET_PROFILE` | Get Profile | Retrieves the user and company profile information from Lexoffice. Use this action to get account details, enabled features, subscription status, and company information. |
| `LEXOFFICE_GET_QUOTATION` | Get Quotation | Tool to retrieve a quotation by its ID. Use when you need to fetch details of a specific quotation including line items, pricing, and payment terms. |
| `LEXOFFICE_GET_QUOTATION_DOCUMENT` | Get Quotation Document | Tool to render a quotation document as a PDF file. Triggers the PDF document file rendering for newly created quotations in status open. Returns a document file ID that can be used to download the PDF. |
| `LEXOFFICE_GET_VOUCHER` | Get Voucher | Tool to retrieve a specific voucher by its UUID. Use when you need to fetch detailed information about vouchers such as sales invoices, credit notes, and other financial documents. |
| `LEXOFFICE_LIST_ARTICLES` | List Articles | Tool to list articles from Lexoffice using filters and pagination. Use when you need to retrieve articles filtered by articleNumber, gtin, or type (PRODUCT/SERVICE). Supports pagination with page and size parameters. |
| `LEXOFFICE_LIST_CONTACTS` | List Contacts | Tool to retrieve all contacts from Lexoffice with optional filters. Use when you need to list contacts with filtering options for number, email, name, vendor status, or customer status. |
| `LEXOFFICE_LIST_COUNTRIES` | List Countries | Tool to retrieve the list of all available countries with tax classifications from Lexoffice. Use when you need to get country information for invoicing, tax calculations, or address validation. |
| `LEXOFFICE_LIST_EVENT_SUBSCRIPTIONS` | List Event Subscriptions | Tool to retrieve all event subscriptions for the current access token. Use when you need to inspect configured webhook subscriptions for events. |
| `LEXOFFICE_LIST_PAYMENT_CONDITIONS` | List Payment Conditions | Tool to retrieve list of currently configured payment conditions from Lexoffice. Use when you need to view all payment terms and conditions set up in the organization. |
| `LEXOFFICE_LIST_POSTING_CATEGORIES` | List Posting Categories | Tool to retrieve the list of posting categories for bookkeeping vouchers (revenue or expense) supported in lexoffice. Use when you need to get available posting categories for creating or updating vouchers. |
| `LEXOFFICE_LIST_PRINT_LAYOUTS` | List Print Layouts | Tool to retrieve all print layouts for invoices and other documents. Use when you need to list available print layouts that can be referenced when creating sales vouchers (invoices, delivery notes, credit notes, etc.). |
| `LEXOFFICE_LIST_RECURRING_TEMPLATES` | List Recurring Templates | Tool to retrieve all recurring templates from Lexoffice. Use when you need to list recurring invoice templates with pagination and sorting options. |
| `LEXOFFICE_LIST_VOUCHERLIST` | List Voucherlist | Tool to retrieve voucherlist from Lexoffice including bookkeeping vouchers (salesinvoices, salescreditnotes), invoices, credit notes, order confirmations, quotations, and delivery notes. Use when you need to list vouchers with filtering options for type, status, dates, or contact. |
| `LEXOFFICE_LIST_VOUCHERS` | List Vouchers | Tool to filter vouchers by voucher number from Lexoffice. Use when you need to retrieve vouchers with a specific voucher number. |
| `LEXOFFICE_UPDATE_ARTICLE` | Update Article | Tool to update an existing article in Lexoffice with new data. Use when you need to modify article details such as price, title, type, or other attributes. Requires the article ID and version number for optimistic locking. |
| `LEXOFFICE_UPDATE_CONTACT` | Update lexoffice contact | Tool to update an existing contact in lexoffice. Use when modifying customer or vendor information. Requires the contact ID and current version number for optimistic locking. |
| `LEXOFFICE_UPLOAD_VOUCHER_FILE` | Upload Voucher File | Tool to upload and assign files (PDF or image) to a specific voucher in lexoffice. Use when you need to attach supporting documents or receipts to an existing voucher. The file upload is asynchronous and returns HTTP 202 (Accepted) when the file is accepted for processing. |

## Supported Triggers

None listed.

## Troubleshooting

### Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

### Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

### Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See [Composio pricing](/pricing) for the current limits that apply to your connection.

## Complete Code

None listed.

## Conclusion

### Use Lexoffice from Atomic Agent
With your account connected, ask Atomic Agent to work with Lexoffice in natural language. You can connect more apps through the same Composio integration as you need them.
Visit the [Atomic Agent website](https://atomicagent.io/?cta_placement=atomic-agent-site) or inspect the [Atomic Agent source code](https://github.com/AtomicBot-ai/atomic-agent?cta_placement=atomic-agent-repo).

## How to build Lexoffice MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/lexoffice/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/lexoffice/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/lexoffice/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/lexoffice/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/lexoffice/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/lexoffice/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/lexoffice/framework/hermes-agent)
- [Google ADK](https://composio.dev/toolkits/lexoffice/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/lexoffice/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/lexoffice/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/lexoffice/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/lexoffice/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/lexoffice/framework/crew-ai)
- [Pydantic AI](https://composio.dev/toolkits/lexoffice/framework/pydantic-ai)
- [AutoGen](https://composio.dev/toolkits/lexoffice/framework/autogen)

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- [Chaser](https://composio.dev/toolkits/chaser) - Chaser is accounts receivable automation software that sends invoice reminders and helps businesses get paid faster. It streamlines the collections process to save time and improve cash flow.
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- [Clientary](https://composio.dev/toolkits/clientary) - Clientary is a platform for managing clients, invoices, projects, proposals, and more. It streamlines client work and saves you serious admin time.
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- [Coinranking](https://composio.dev/toolkits/coinranking) - Coinranking is a comprehensive cryptocurrency market data platform offering access to real-time coin prices, market caps, and historical data. Get accurate, up-to-date stats for thousands of digital assets in one place.
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- [CurrencyScoop](https://composio.dev/toolkits/currencyscoop) - CurrencyScoop is a developer-friendly API for real-time and historical currency exchange rates. Easily access fiat and crypto data for smart, up-to-date financial applications.

## Frequently Asked Questions

### 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 Atomic Agent?

Yes, you can. Atomic Agent 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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