CallChatSyn

What CallChatSyn MCP server does

CallChatSyn MCP server gives an MCP-compatible assistant access to a small business’s customer-service and appointment data. It can answer questions using the business’s FAQs and order information, return answers in English or Chinese, identify requests to book an appointment, and flag requests to speak with a person.

The server also supports appointment workflows. It lists up to five upcoming openings during the next seven days in the business’s time zone, including available services and locations. Availability comes from CallChatSyn opening hours or from a connected Cal.com account. Confirmed bookings return an appointment id, and the business receives a notification. Cancellation uses that same id.

How it works

The CallChatSyn MCP server is available remotely at https://callchatsyn.com/api/mcp, so a compatible client can connect without installing a local package. Requests without an API key use a demo business. A business-specific request uses a bearer token in the Authorization header.

A local stdio configuration is also available through npx and the project’s GitHub repository. In either mode, the assistant calls the exposed MCP tools rather than directly handling the business’s scheduling system.

FAQ responses use rule-based matching. This makes the behavior predictable, but the server does not generate free-form answers from a general-purpose language model. Booking and cancellation change data; question answering and availability lookup are read-only.

Setup and configuration

To use a real business, create a CallChatSyn account, add its FAQs and opening hours, claim founder access from the Developers area, and create an API key. Keep the key private because it authorizes actions for one business.

For local use, configure the MCP client with the npx command and set CALLCHATSYN_API_KEY to a ccs_live_... key. For remote use, add the MCP URL as a custom connector and provide the bearer token as required by the client.

Leaving out the key selects the public demo key, ccs_demo_public. The demo provides sample answers and makes appointment creation and cancellation dry runs, allowing the tools to be tested without changing a live business account.

Tools and capabilities

• answer_customer_question reads the business’s FAQs and order data, supports English and Chinese answers, and flags booking or human-support requests.
• list_open_times returns up to five openings over the next seven days, along with services and locations.
• book_appointment creates a booking for one of the returned times and provides its id. It is not idempotent.
• cancel_appointment cancels a booking by id, including the corresponding Cal.com booking when Cal.com is connected.

Cal.com synchronization applies to availability, booking, and cancellation when the business has connected Cal.com. Rescheduling is a two-step process: cancel the existing booking, then book a new time.