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How to connect OpenRegister MCP with ChatGPT

Connect ChatGPT to OpenRegister MCP. Find ownership details for siemens ag, check insolvency records for wirecard ag, and more using natural language, with authentication handled for you.

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OpenRegister provides structured German register data for companies, people, ownership, finances, insolvency, documents, monitoring, and usage. Use it to access reliable business intelligence from German public-register sources in one place.

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How to connect OpenRegister MCP with ChatGPT

ChatGPT can take action across your apps and files, stay with a project for hours, and turn a goal into finished materials like sheets, slides, and docs, not just answers.

In this guide, I will explain the easiest and most secure way to connect your OpenRegister account to ChatGPT via Composio Connect, so it can find ownership details for siemens ag, check insolvency records for wirecard ag, monitor new filings for volkswagen ag through natural language commands without ever putting your account credentials at risk.

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Why use Composio over default connectors?

  • Apps with read and write access. Default connectors mostly can read your data. Composio's OpenRegister integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
  • 1,500+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
  • One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
  • Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
  • Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

Prerequisites

  • A ChatGPT account. We will use the ChatGPT desktop app, and the steps are the same on the web.
  • Access to the OpenRegister workspace you want to connect.
  • Composio plugin.

Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.

Step-by-step: Connect OpenRegister to ChatGPT

1. Install the Composio plugin

Click the button. ChatGPT opens the Composio plugin page. Click Install plugin.

Install in ChatGPT

Composio plugin page in ChatGPT with the Install plugin button

You can also find it inside ChatGPT: go to Settings, open Plugins, search the marketplace for Composio, and click Install plugin.

2. Authenticate

After you install, ChatGPT asks you to authenticate with Composio. Log in and click Allow access to authorize ChatGPT to use your Composio account.

Composio login and Allow access screen for ChatGPT

3. Start using Composio

That is it. Composio tools are now available in ChatGPT. Type @Composio followed by your request, for example @Composio find unread OpenRegister messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize OpenRegister.

Option 2: Add Composio as an MCP server

If you cannot use the plugin marketplace, add Composio as a custom MCP server instead.

1. Open the MCP settings

In ChatGPT, go to Settings and open the Plugins section. Inside the Plugins page, click the MCP tab.

ChatGPT settings showing the Plugins page with the MCP tab selected

2. Add the server

Click Add server. In the Name field enter Composio, for Type select Streamable HTTP, and in the URL field paste the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
ChatGPT Add server dialog with the name Composio, type Streamable HTTP, and the Composio MCP URL

Then click Save. The Composio server now appears in your MCP plugins list.

ChatGPT Plugins page showing the Composio MCP server added to the list

3. Authenticate

Click Authenticate on the Composio entry, log in via Composio, and click Allow access. Composio tools are then available in ChatGPT the same way as with the plugin.

What you can do after connecting OpenRegister

  • Find ownership details for Siemens AG
  • Check insolvency records for Wirecard AG
  • Monitor new filings for Volkswagen AG

Security + privacy notes (important)

  • Use least-privilege access: Only grant permissions you actually need.
  • Review OAuth permissions before approving: Make sure requested scopes match what you expect Composio and ChatGPT to do.
  • Keep write actions human-reviewed: For actions like sending messages, creating labels, or editing drafts, keep manual confirmation enabled.
  • Be careful with sensitive data: Avoid using this setup with highly sensitive information unless allowed by your personal, company, or client policies.
TOOLS

Supported Tools

Every OpenRegister action and event your agent gets out of the box.

Get Company Data

Read one company profile, financials, historical ownership, holdings, current owners, or UBOs.

Get Credit Usage

Check the connected OpenRegister account's plan, included and used credits, remaining balance, overage, and reset time.

Get Document

Fetch an official Handelsregister document in real time for a company or retrieve a stored document by ID.

Get Insolvency

Get one insolvency proceeding and its complete published event history, including linked entities, status, court, case dates, administration, distributions, and event-specific details.

Get Person Data

Read a person's profile and management positions or the companies in which they hold ownership stakes.

List Monitors

List every company and person monitor for the connected OpenRegister account, including disabled monitors.

Look Up Company by URL

Resolve a fully qualified company website URL to its OpenRegister company ID and available contact details.

Search Companies

Find companies by name or structured criteria.

Search Insolvencies

Search German insolvency proceedings by free text or structured debtor, proceeding, status, date, company, or person criteria.

Search People

Search natural persons by name, birth date, city, or active status.

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FAQ

Frequently asked questions

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

Yes, you can. ChatGPT 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 OpenRegister tools.

Yes, absolutely. You can configure which OpenRegister 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.

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 OpenRegister data and credentials are handled as safely as possible.

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