How do I validate IBANs through MCP in Claude Desktop or Cursor?

Steps

1. Open your MCP configuration file (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json).
2. Add the Strale server entry.
3. Restart the app so it loads the server.
4. Ask for an IBAN check.

The solution

{
  "mcpServers": {
    "strale": {
      "command": "npx",
      "args": ["-y", "strale-mcp"]
    }
  }
}

Then ask the assistant:

Validate this IBAN: DE89370400440532013000

How it works

The server adds a small set of meta-tools to your client, not one tool per Strale tool. The assistant finds a tool with strale_search and runs it with strale_execute, so you can ask for "a way to check a bank code" without knowing a slug.

Free tools need no key. For paid tools, set STRALE_API_KEY in the server's env block. The full set of options, the hosted server and Claude Code are covered in Connect over MCP.

Tools in this guide