ares-mcp
Czech & Slovak business registry MCP server.
What it can do
- Lookup Company Cz: Look up a Czech company in the ARES registry by IČO. Returns full profile: name, address, VAT number, legal form, NACE codes, registration status across all registries.
- Search Companies Cz: Search Czech companies by name in ARES. Returns up to 10 matching companies with IČO and address.
- Check Insolvency Cz: Check if a Czech company or person is in insolvency proceedings via the ISIR (Insolvenční rejstřík). Returns active insolvency cases.
What data it sees
Do you need an account
No: the server works without sign-in
Czech & Slovak business registry MCP server. Look up companies by IČO, search by name, check insolvency status, and query the Slovak ORSR — all in one tool. Data from ARES (Czech Ministry of Finance), ISIR insolvency register, and ORSR Slovakia.
How to connect
How to connect ares-mcp to Claude
The server address to paste into Claude settings:
https://ares-mcp--janmacher02-xl8y.run.tools
- Open Claude (claude.ai or the desktop app).
- Go to Settings → Connectors.
- Click Add custom connector.
- Paste the server address copied below into Remote MCP server URL and click Add.
- In a chat, click + → Connectors and switch the new connector on.
Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.
Authorization
After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.
How to connect ares-mcp to ChatGPT
The server address to paste into ChatGPT settings:
https://ares-mcp--janmacher02-xl8y.run.tools
- Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
- Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
- Open Settings → Connectors and click Create.
- Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
- Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
- In a new chat open + → Apps/Connectors and enable the connector.
OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.
Authorization
On first use ChatGPT opens the service's sign-in window. Sign in and approve access.
How to connect ares-mcp to Cursor
The server address to paste into Cursor settings:
https://ares-mcp--janmacher02-xl8y.run.tools
Fastest: click Open in Cursor below and confirm the prompt.
Manually:
- In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
- Paste the JSON copied below into
~/.cursor/mcp.json(per project:.cursor/mcp.jsonin the repo root). - Save the file. The server appears in the MCP list; authorize it there if asked.
Authorization
If the service needs sign-in, an authorize button appears next to the server in the MCP list.
Server tool list (5)
Raw names from tools/list. Only developers need these.
| lookup_company_cz | Look up a Czech company in the ARES registry by IČO. Returns full profile: name, address, VAT number, legal form, NACE codes, registration status across all registries. |
| search_companies_cz | Search Czech companies by name in ARES. Returns up to 10 matching companies with IČO and address. |
| check_insolvency_cz | Check if a Czech company or person is in insolvency proceedings via the ISIR (Insolvenční rejstřík). Returns active insolvency cases. |
| lookup_company_sk | Look up a Slovak company in the ORSR (Obchodný register SR) by IČO. Returns company name, address, legal form and registration details. |
| bulk_lookup_companies_cz | Look up multiple Czech companies at once by their IČO numbers. Returns basic info for each. Maximum 10 companies per request. |