Agentic-Firmenbuch.at
DE Playground Connect

The Austrian Firmenbuch – straight into Claude & Co.

The Firmenbuch is Austria’s official company register – master data, filed annual accounts and computed financial ratios for every registered company. Your AI agent queries it in plain language and answers with real data, not hallucinations.

Connect Try the playground
Works with
Claude Cursor GitHub Copilot any MCP-compatible agent

An MCP server is a standardized interface that lets AI tools plug in external data sources – set up once, usable in any MCP-compatible tool.

Overview

Official company data – ready for agents.

The Firmenbuch is Austria's official company register – with master data and the filed annual accounts of every registered company. We parse those filings, compute financial ratios, and serve everything machine-readable via an MCP server.

After a one-time setup in your AI tool, the agent answers questions in plain language with current original data straight from the register – not hallucinated values.

Firmenbuch → Parsing & ratios → MCP server → AI agent
What you can do with it

Reliable answers, not hallucinations.

For every answer, the AI agent pulls directly from official Firmenbuch data – traceable and verifiable, not made up. No scraping, no PDF parsing.

// M&A

“Active GmbHs in Upper Austria with balance sheet over €5M whose managing director is over 60.”

→ returns acquisition & succession targets
// Sales

“Mid-sized GmbHs in Vienna with a high equity ratio – for my sales pipeline.”

→ returns a qualified lead list
// Marketing & research

“Which GmbHs were founded in Styria in the last 3 years?”

→ returns a target-customer list
// Due diligence & KYC

“Check ‘Example GmbH’: active since when, current management, latest balance-sheet figures.”

→ returns the company profile, status & source document

M&A & investments

Screen targets by size, growth and capital structure – with solid balance-sheet figures, not gut feel.

Sales, marketing & research

Qualified leads, target-customer lists and market overviews in seconds – by region, size and financial ratios.

Developers & agents

Register data as clean tools inside agentic workflows – no scraping, no PDF parsing.

Integrations

Connect once, query everywhere.

Agentic-Firmenbuch.at is an MCP server – the open standard AI tools use to call external data sources. Connect once, use it in every compatible tool.

  • Claude Cowork (desktop app) – one-click connect, no API key (email login). (see guide)
  • Claude Code – terminal tool (macOS, Windows, Linux).
  • VS Code (Copilot Chat) – in your usual editor.
  • Cursor and other MCP clients with HTTP-header support.
How it works

Connected in minutes.

Claude Cowork connects one-click via Settings inside the app with an email login – no API key (see guide). With an API key, for Claude Code, VS Code and Cursor, in three steps:

1

Enter your email

Enter your email address. No password, no credit card, no sales call.

2

Confirm your email

You'll get a confirmation link (double opt-in); one click is enough to verify.

3

Get your API key & connect

The API key is sent right away and stored in your AI tool.

Playground

Try it in the playground.

Pick a role, ask a question – and watch the AI agent answer it with real register data via the Firmenbuch MCP server. No sign-up needed.

Agent console Source: Firmenbuch MCP server
1 System prompt

Who is the agent? Sets role, tone and rules – defined once.

2 User prompt

What should it do? The concrete question or task – changes per request.

Enter to send · Shift + Enter for a new line

firmenbuch.search()
Agent is querying the Firmenbuch…
Illustrative example. With a free API key, the server returns real data from the Firmenbuch.
Connect

A standards-compliant MCP server – connected in minutes.

The service is accessed over the Model Context Protocol – compatible with Claude, Claude Code, VS Code and any MCP client. Authentication via an X-API-Key header; no SDK required, configured by server URL and key.

View the guide Open source on GitHub
mcp.config.json 
{
  "mcpServers": {
    "agentic-firmenbuch": {
      "url": "https://mcp.agentic-firmenbuch.at/mcp",
      "headers": {
        "X-API-Key": "API_KEY"
      }
    }
  }
}

Tools

  • Search & filter companies (region, size, ratios)
  • Detail & historical data per company
  • Link source documents (annual accounts)
  • Size and regional overviews

Fair-Use-Limits

  • Rate limit per API key (fair use)
  • No usage-based fees
  • Higher limits on request
FAQ

FAQ.

Is it free?
Use is free, with a fair-use rate limit per API key. Only a verified email address is required – no password, no credit card.
Where does the data come from?
From the official Austrian Firmenbuch (BMJ – Ministry of Justice), including the filed annual accounts. We parse the filings and compute financial ratios. Source: Austrian Firmenbuch / BMJ – Ministry of Justice, licensed under CC BY 4.0.
Which data fields are included?
Master data (company name, Firmenbuch number, legal form, registered seat, founding year, management), the filed annual accounts plus computed ratios and multi-year trends. A complete list of all available fields is in the data-fields documentation.
How are EBIT and EBITDA computed?
The Austrian UGB statement (§ 231 (2), total-cost method) reports neither EBIT nor EBITDA. As ebit we use the reported operating result (Betriebserfolg) (operating result before financial result and taxes); ebitda is the operating result plus depreciation. This is not the strict EBIT definition (result before interest and taxes, including financial result) but a simplified approximation. For companies with material financial or participation results (e.g. holdings) values may differ noticeably. All other line items are passed through unchanged from the statement. Details in the data-fields documentation.
Which companies are included?
All legal forms are covered – GmbH, AG, KG, OG, sole proprietorships, co-operatives, private foundations, SE etc.; there is no per-legal-form gap. Currently about 341,000 legal entities are served. This is a continually growing slice of the full register: entities without a filed annual statement as well as inactive and deleted entries are not yet fully included and are added step by step. Banks and insurers are included but report under their own regulatory schema (BWG/VAG), so individual ratios may differ or aren't directly comparable. Included is Firmenbuch data only – we do not mix in external sources such as industry, market or credit-rating data.
Which companies have computed ratios?
Financial ratios exist only where an annual statement was filed. A large share of companies file only a balance sheet, so revenue and P&L are available for a minority. size_gkl is the UGB filing size class, not the actual balance-sheet total. An industry / NACE filter is not yet available.
What is an MCP server?
MCP (Model Context Protocol) is an open standard that AI tools use to call external data sources and tools. An MCP server exposes those tools – connect it to your AI tool once and use the Firmenbuch data straight inside the conversation.
Which tools are supported?
Claude Cowork connects one-click via the app settings with an email login (no API key) – see guide. Claude Code (terminal), VS Code (Copilot Chat), Cursor and every other MCP client with HTTP-header support connect with an API key.
Privacy?
We process only the email address to create the API key (double opt-in). No tracking cookies are used. Details in the privacy policy.
Liability and warranty?
All data is processed automatically with best effort – but that does not warrant accuracy, completeness or timeliness. Use is entirely at your own risk and under exclusion of any warranty. In case of doubt the official Austrian Firmenbuch is the authoritative source. Details in the Terms of Service.