"Visa" matching MCP servers:

Enables households to track hard deadlines like visa renewals, school fees, and insurance in a markdown vault, with tools to list upcoming due items, add new deadlines, and detect scheduling conflicts.

Enables an agent to find a business by phone number, check availability, book and cancel appointments, and verify business-signed receipts against a sandbox registry and demo shops that run locally over stdio. Every registry record and receipt is signature-checked, and nothing real is booked because the shops live inside the server process.