CallChatSyn
Answer small-business customer questions from FAQs, list open appointment times, and book them.
Connect it
Settings → Connectors → Add custom connector
URL: https://callchatsyn.com/api/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://callchatsyn.com/api/mcp{
"mcpServers": {
"callchatsyn": {
"url": "https://callchatsyn.com/api/mcp",
"headers": {
"Authorization": "<YOUR_AUTHORIZATION>"
}
}
}
}claude mcp add --transport http callchatsyn https://callchatsyn.com/api/mcp --header "Authorization: <value>"{
"servers": {
"callchatsyn": {
"type": "http",
"url": "https://callchatsyn.com/api/mcp",
"headers": {
"Authorization": "<YOUR_AUTHORIZATION>"
}
}
}
}4 tools, verified live
answer_customer_questionread-onlyAnswer a customer's message for one small business using only that business's own FAQs and order records. Rule-based, not generated, so it never invents prices or opening hours; English and Chinese are detected automatically. Read-only: it never books or changes anything. Use it first for any customer message. If it returns intent 'appointment', call list_open_times next; if matched is false or in
list_open_timesread-onlyList the business's next open appointment times: up to 5, soonest first, within the next 7 days, labelled in the business's time zone, plus its services and locations. Read-only. Call it before book_appointment and whenever a customer asks when they can come in. Times come from the business's CallChatSyn hours or from its connected Cal.com calendar. Returns JSON { slots: [{ start, label }], servic
book_appointmentBook one appointment for a customer. This creates a real booking: the business is notified, and if it has connected Cal.com the booking is created there too. With the demo key it's a dry run that books nothing. Not idempotent: booking the same time twice fails the second time. Only call it after the customer has confirmed the time and service; needs a 'start' from list_open_times and the customer'
cancel_appointmentcan modifyCancel one of the business's bookings by the 'id' that book_appointment returned. This changes data: the time becomes free again, and if the business has connected Cal.com the booking is cancelled there too (Cal.com emails the customer). Only call it after the customer has clearly asked to cancel that specific booking. To reschedule, cancel and then book a new time from list_open_times. With the d
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