# CallChatSyn Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## CallChatSyn

Answer customer questions from FAQs and book appointments for your small business.

- Record: https://musedirectory.ai/connector/callchatsyn
- Category: Productivity
- Developer: OneAppsWorld (https://callchatsyn.com/developers)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, 875ms, checked 2026-10-29T11:16:08Z
- Endpoint: https://callchatsyn.com/api/mcp
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-10-28T21:46:11Z)
- Source: Found in the official MCP Registry (com.callchatsyn/callchatsyn) https://registry.modelcontextprotocol.io/v0/servers?search=com.callchatsyn%2Fcallchatsyn

Connects to a small business's FAQ and appointment system. Muse can answer customer questions in English or Chinese, show available appointment times, and book appointments with customer details.

Example request: "Show me our next available appointment slots and book a customer in for a haircut tomorrow at 2 PM."

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use CallChatSyn to help me. It is a free service with an MCP server at https://callchatsyn.com/api/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Tools:
- answer_customer_question: Answer 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 
- list_open_times: List 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 t
- book_appointment: Book 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. On
- cancel_appointment: Cancel 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 clearl

Screening checks:
- MCP handshake: pass (Answered in 1068ms)
- Domain against threat feeds (Cloudflare security DNS): pass (callchatsyn.com not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: pass (3 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (Domain registered 53 days ago)
- AI review of purpose and tool behavior: pass (No concerns)