MCP.Market

CallChatSyn MCP server

online · 100% uptime
by callchatsyn.com·com.callchatsyn/callchatsyn·v0.1.0
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Answer small-business customer questions from FAQs, list open appointment times, and book them.

A88/100grade A
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Safety scan
A88/100

full report

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If you have run it, two minutes of your experience saves the next person an afternoon.

CallChatSyn tools (4, 1 write)

write = sends, deletes, buys or posts
  • answer_customer_questionFree

    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 customer message. If it returns intent 'appointment', call list_open_times next; if matched is false or intent is 'human_handoff', tell the customer a person will follow up. Authenticates with the connection's API key (Authorization: Bearer ccs_live_…); without a key it answers as a public demo business. Returns JSON { intent, lang, matched, reply, next? }.

  • book_appointmentFree

    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 customer has confirmed the time and service; needs a 'start' from list_open_times and the customer's email or phone. Errors: 404 the time is no longer offered (call list_open_times again), 409 it was just taken, 400 missing start, service, or both email and phone, or the business's connected calendar needs a detail the customer didn't give (the message says which, e.g. an email). Returns JSON { booked, id, start, label }; keep 'id' if the customer may want to cancel.

  • cancel_appointmentwrite actionFree

    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 that specific booking. To reschedule, cancel and then book a new time from list_open_times. With the demo key it's a dry run. Errors: 404 no such booking for this business, 409 already cancelled, 400 not a booking id. Returns JSON { cancelled, id, start }.

  • list_open_timesFree

    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 CallChatSyn hours or from its connected Cal.com calendar. Returns JSON { slots: [{ start, label }], services, locations }; pass a slot's 'start' to book_appointment unchanged. An empty slots list means nothing is open this week.

Public scan report

scanner v0.1.10 · 2026-10-14 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 687ms20/20
  • Tool poisoning4 tool descriptions checked15/15
  • Auth qualityAPI key sent as a header8/15
  • Maintenancelast push 8 days ago15/15
  • Maintainer identityendpoint served from the registry-verified namespace domain8/10
Overall 88/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How CallChatSyn compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
88/100
higher than 75% of 48,255 servers
Tools
4
the typical server has 7
Tools that change things
25%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
192 ms
faster than 65% of 30,031 servers

What its tools let an agent do: 2 read · 1 create · 1 delete

Install CallChatSyn in Claude Code, Cursor or VS Code

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

What the publisher says

From the CallChatSyn repository's README, as published. We do not edit it. Read it on GitHub

CallChatSyn MCP server

Let an AI assistant (Claude, Cursor, any MCP client) answer customer questions and book appointments for a small business, using that business's own FAQs and opening hours on CallChatSyn.

Free for the first 1,000 businesses (founder offer: 100 API calls a day, 2,000 a month).

Tools

Remote server (nothing to install)

Add this URL as a custom connector (Claude: Settings → Connectors → Add custom connector; Cursor and others: a Streamable HTTP server):

https://callchatsyn.com/api/mcp

Without a key it uses the demo business. To act for your own business, send the header Authorization: Bearer ccslive.... Also listed in the official MCP Registry as com.callchatsyn/callchatsyn.

Local setup (npx)

  1. Create a CallChatSyn account, add FAQs and opening hours, then Dashboard → Developers → claim founder access → create an API key.
  2. Add to your MCP client config:
{
  "mcpServers": {
    "callchatsyn": {
      "command": "npx",
      "args": ["-y", "github:oneappsworld/callchatsyn-mcp"],
      "env": { "CALLCHATSYN_API_KEY": "ccs_live_..." }
    }
  }
}

Keep the key private; it acts for one business.

No key yet? Leave CALLCHATSYNAPIKEY out and the server uses the public demo key (ccsdemopublic): answers come from a demo business and bookings are dry runs, so you can try every tool before signing up.

Notes

  • Answers are rule-based FAQ matching (fast, predictable), not free-form generation.
  • API docs and OpenAPI spec: https://callchatsyn.com/developers · https://callchatsyn.com/openapi.json

MIT licensed.

Nothing above is checked by us. What we check is on the safety report.

CallChatSyn: common questions

Is CallChatSyn MCP server safe?
Yes, by our scan: it is graded A (88/100). Read the CallChatSyn safety report
How do I install CallChatSyn?
It runs remotely at callchatsyn.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does CallChatSyn need an API key?
Yes. The registry entry asks for Authorization.
Is CallChatSyn maintained?
The last commit was 29 days ago (2026-10-06). The latest release is v0.1.0.
Is CallChatSyn up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does CallChatSyn compare with other MCP servers?
safety score 88/100 (higher than 75% of 48,255 servers); tools 4 (the typical server has 7); tools that change things 25% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.