How to Use the isvat MCP in Claude

Q: How do I install the isvat tool on Claude Desktop?

Open your claudedesktopconfig.json file and add the isvat server configuration under the mcpServers key. Once you save the file and restart Claude Desktop, the tax validation tools will appear under the hammer icon in your chat window.

Audit European VAT numbers directly inside Claude Desktop to stop tax compliance errors before they hit your ledger.

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Connect isvat MCP to Claude Desktop

Create your Vinkius account to connect isvat to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup isvat with Claude Desktop

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Validate EU VAT in Claude Desktop

The `validate_eu_vat` tool verifies European tax IDs directly inside your Claude Desktop chat interface. You paste raw invoice text into the chat, and your agent extracts the VAT number to confirm its current registry status. Claude Desktop handles the formatting cleanup, stripping out spaces or dashes before querying the tax database. This MCP server returns the official business name and address immediately, saving you from manual browser searches.

Bulk audits on local files

The `validate_multiple_vat` tool processes lists of corporate tax identifiers directly from your local files using Claude Desktop. Your agent reads a spreadsheet from your hard drive, extracts the VAT numbers, and checks them in parallel. This setup lets Claude Desktop run concurrent checks over standard stdio transport without exposing your files to external web apps. You get a clean list of verified companies and flagged errors saved right back to your machine.

Check database health via MCP Server

The `check_api_status` tool verifies whether the official European tax registry is actually online before you run audits in Claude Desktop. Since government servers frequently go offline, this check prevents silent validation errors in your chat session. Your Claude Desktop agent alerts you if the registry is down so you do not mistakenly flag a valid company. Check the status, run it again, and keep your tax records accurate.

Setup guide

Set up isvat MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The isvat MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the isvat MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under isvat-mcp.

json

{
  "mcpServers": {
    "isvat-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by isvat. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about isvat MCP in Claude Desktop

Open your claude_desktop_config.json file and add the isvat server configuration under the mcpServers key. Once you save the file and restart Claude Desktop, the tax validation tools will appear under the hammer icon in your chat window.

Yes, the server includes a specific tool for bulk processing that your Claude Desktop agent can trigger. You can point Claude Desktop to a local CSV file of tax IDs, and it will run them through the concurrent verification process.

Your agent runs the status tool to check the connection health first. If the government database is offline, Claude Desktop reports the outage directly so you don't mistakenly flag valid tax IDs as invalid.

No, the underlying isvat tools automatically clean up spaces, dashes, and country prefixes in Claude Desktop. Just paste the raw text or document, and the agent extracts what it needs.

Zero data is stored on Vinkius servers because your EU VAT numbers are sent directly to the official government databases via an ephemeral V8 sandbox. The validation requests from Claude Desktop are processed in memory and wiped the moment the execution finishes.

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