Is there an official onOffice MCP server?
Yes. onOffice offers the onOffice AI Connector for onOffice enterprise, and it works via the Model Context Protocol (MCP). You activate it in the onOffice Marketplace, receive your own MCP server address and enter it as a connector in your AI assistant. The AI chat remains your interface, and onOffice supplies the data.
For estate agencies, this means you do not have to program your own MCP server to hook Claude or ChatGPT up to onOffice. The work lies elsewhere, namely in permissions, data protection and the question of which processes should go beyond the chat. We explain separately what an MCP server is in principle.
In short: The AI Connector is the official MCP access to onOffice enterprise. According to onOffice, it is included in the “all-in” and “expert” packages, works with the rights of the signed-in user and has been tested with ChatGPT, Claude, Mistral and Langdock.
The AI Connector at a glance
| Feature | Status according to onOffice |
|---|---|
| Provider | onOffice GmbH, official product |
| Protocol | Model Context Protocol (MCP), own MCP server URL per account |
| AI assistants named | ChatGPT, Claude, Mistral, Langdock, plus other MCP-capable systems and locally run language modelsTested according to the help page, as of July 2026: ChatGPT, Claude, Mistral Vibe, Langdock |
| Packages | included in onOffice enterprise “all-in” and “expert”The help page names “all-in”; check in your own contract |
| Permissions | works with the permissions of the signed-in onOffice user |
| Technical requirement | the AI provider must support “Dynamic Client Registration”, otherwise no support from onOffice |
| Operation | according to the help page, the services run on onOffice servers |
What the AI Connector can do
On its product page, onOffice names the following actions, among others, from within the AI chat:
- Properties and addresses: search, retrieve information, create and change records.
- Appointments: create, change, retrieve.
- Activities: create, for example a viewing record.
- Tasks: create and link to properties or addresses.
One point is not clear on the page itself. In its frequently asked questions, onOffice writes that the AI can “currently” create activities and tasks, with further functions planned. The function list, however, also names creating and changing properties and addresses. Check in your own account which tools the connector actually offers before you build a process on it.
Typical questions from everyday office work that land directly in the chat this way:
- Looking up a property“Which three-room flats in Eimsbüttel do we currently have on the market, and which of them have a balcony?”
- Preparing a conversation“Summarise what has happened with Ms Example since her last enquiry.”
- Following up a viewing“Create an activity for today's viewing and a task to follow up in three days.”
Connecting Claude to onOffice: how it works
According to onOffice, setup needs no programming skills. For Claude, the onOffice help describes these steps:
- In onOffice enterprise, copy the MCP server URL under Marketplace → onOffice AI Connector → Set up.
- In Claude, add a custom connector under Settings → Connectors and paste the URL.
- Enter the code that Claude displays in the AI Connector setup in onOffice. The connection is then in place.
- In Claude, set per tool whether it is used automatically, only after confirmation or never. onOffice recommends configuring this carefully in advance for tools that handle personal data.
For ChatGPT, the onOffice help refers to a separate guide; there, the connection runs via developer mode.
Data protection: what to clarify before switching it on
According to onOffice, whether use is GDPR-compliant depends on the specific use and the chosen AI provider. So there is no blanket approval. These points should be clarified before the first chat:
- Contract with the AI provider: Data from onOffice ends up with the language model. A data processing agreement (DPA) and the provider's server location therefore belong on the table first.
- Providers outside the EU: onOffice advises having exactly this case checked legally and names European providers or local language models as an option for sensitive data.
- Permissions in onOffice: The connector sees what the signed-in user sees. Whoever connects with full access gives the chat full access.
- Approvals in the AI assistant: Set write tools to “after confirmation” until your team knows the results.
- Checking the results: onOffice itself writes that AI does not replace professional review. Tasks and activities it creates should be spot-checked in the first weeks.
How we secure MCP connections in general is covered in the guide MCP server, security and GDPR.
When the connector is enough and when you need more
The AI Connector covers the most common case well: a person asks in the chat, onOffice answers. As soon as a process is to run without a chat or bring several systems together, you need a layer of your own on top.
| Project | AI Connector | Own integration |
|---|---|---|
| Looking up properties and contacts in the chat | fits | not needed |
| Creating activities and tasks from the chat | fits | not needed |
| Processes without a chat, for example pre-sorting every new portal enquiry automatically | not intended, the chat is the interface | Workflow via the onOffice API |
| onOffice together with mailbox, accounting or company knowledge in one process | onOffice data only | own MCP server or workflow that connects several systems |
| Package without “all-in” or “expert” | not included according to onOffice | Check integration via the onOffice API |
| Language model on your own hardware | can be connected according to onOffice, if MCP-capable | Operation and integration of the local model |
Where Workflow Agentur helps
We introduce AI in mid-sized companies, locally or in the cloud, and connect your systems for it via MCP. With onOffice, that means in concrete terms:
- Introducing the AI Connector: permission concept, tool settings in the AI assistant, test cases for your team.
- Documents for the data protection review: which data flows where, so that your data protection officer can decide.
- Processes beyond the chat: integrations that connect onOffice with mailbox, calendar, accounting or your company knowledge.
- Local language models: if data should not leave your premises.
Website, portal interfaces and marketing for estate agents are handled by our sister brand: onOffice website and API integration at Weber Media. You will find the industry overview at AI and automation for real estate companies, and the counterpart for Propstack at Propstack MCP server.
Frequently asked questions
Does onOffice have its own MCP server?
Yes. The onOffice AI Connector is the official MCP access to onOffice enterprise. You activate it in the Marketplace and receive your own MCP server URL for your AI assistant.
Which AI assistants work with the onOffice AI Connector?
onOffice names ChatGPT, Claude, Mistral and Langdock as well as other MCP-capable systems and locally run language models. The provider must support Dynamic Client Registration, otherwise onOffice does not provide support.
In which onOffice packages is the AI Connector included?
According to onOffice's product page, in onOffice enterprise “all-in” and “expert”. The help page names “all-in”. Check the current status in your contract.
Does the AI see all data in onOffice?
No. According to onOffice, the AI Connector works with the rights of the signed-in user. In addition, you define in the AI assistant which tools it may use.
Is the onOffice AI Connector GDPR-compliant?
That cannot be said across the board. onOffice itself makes it depend on the use and on the AI provider and recommends a legal review for providers outside the EU. A data processing agreement (DPA) with the AI provider is part of it.
Sources
- onOffice GmbH, product page “onOffice AI Connector”, onoffice.com, accessed 26 October 2026
- onOffice Help, “onOffice Services – AI Connector”, enterprisehilfe.onoffice.com, status of tested providers July 2026, accessed 26 October 2026
- onOffice API documentation, apidoc.onoffice.de, accessed 26 October 2026
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