MCP server

CallChatSyn Official

com.callchatsyn/callchatsyn

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Answer small-business customer questions from FAQs, list open appointment times, and book them.

Website Source

At a glance

Type

MCP server

Publisher

callchatsyn.com (verified by the MCP Registry)

Status

Working at last check

Tools

4

Token cost

About 1,309 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http callchatsyn https://callchatsyn.com/api/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.callchatsyn]
url = "https://callchatsyn.com/api/mcp"

Gemini CLI

{"mcpServers":{"callchatsyn":{"httpUrl":"https://callchatsyn.com/api/mcp"}}}

Cursor

{"mcpServers":{"callchatsyn":{"url":"https://callchatsyn.com/api/mcp"}}}

VS Code

{"servers":{"callchatsyn":{"type":"http","url":"https://callchatsyn.com/api/mcp"}}}

Antigravity

agy mcp add callchatsyn https://callchatsyn.com/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"callchatsyn","server_url":"https://callchatsyn.com/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"callchatsyn","server_url":"https://callchatsyn.com/api/mcp"}

Tools

• answer_customer_question ~293 tokens
  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 first for any custom
• book_appointment ~490 tokens
  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. Only call it after the
• cancel_appointment ~288 tokens
  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 clearly asked to cancel th
• list_open_times ~238 tokens
  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 the business's CallCh

Browse

• Email
• Calendars
• Booking and scheduling

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