CallChatSyn

Name: CallChatSyn
Author: oneappsworld

by oneappsworldversion 0.1.0i★ 0iRuns in the cloud

Registry namecom.callchatsyn/callchatsyn

How to install

Overview

Description from the maker (original English)

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

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Other
You need to fill in: Authorization

Install

Pick the AI app you use, then copy the settings.

Passed 5/5 checks · What you ask goes through the maker’s server (callchatsyn.com)

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude · about 5 min

You need a CallChatSyn key (sign up on the maker’s site, may cost money) · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1

Sign up and create a CallChatSyn key
Open the maker’s site, sign up and create an API key for the next step. It may cost money.
Open the CallChatSyn site ↗
Done
Open Claude’s Connectors page
CustomizeConnectors
Done
Click “+ Add” → “Add custom connector” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameCallChatSyn
Remote MCP server URL · Addresshttps://callchatsyn.com/api/mcp
Under Request headers, add this name and value
Header nameAuthorization
ValueBearer <paste your key here>
Paste the key only into the app’s field, never into a chat or to anyone
Leave Authentication as Claude detected it, then click Add
Done
Turn it on in a chat
+ConnectorsCallChatSyn
Done
Try it
Use CallChatSyn and tell me what you can do for me, then show me one thing
✓ If Claude says it is using CallChatSyn or shows a CallChatSyn tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect CallChatSyn yet

CallChatSyn needs your own key to connect, but OpenAI’s help page only describes OAuth sign-in; there is no key option we could verify

What you can do instead

A · Use an app that can connect CallChatSyn

Steps for Claude →You need a CallChatSyn key (sign up on the maker’s site, may cost money) · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1
Steps for Claude Code →You need a CallChatSyn key (sign up on the maker’s site, may cost money)
Steps for Cursor →You need a CallChatSyn key (sign up on the maker’s site, may cost money)
Steps for VS Code →You need a CallChatSyn key (sign up on the maker’s site, may cost money)

B · Others in Other that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Hostinger✓ ChatGPT
World Monitor✓ ChatGPT
Svelte MCP✓ ChatGPT

Works with Claude Code · about 5 min

You need a CallChatSyn key (sign up on the maker’s site, may cost money)

Sign up and create a CallChatSyn key
Open the maker’s site, sign up and create an API key for the next step. It may cost money.
Open the CallChatSyn site ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done
3
Paste this command and press Enter
```
claude mcp add --transport http callchatsyn https://callchatsyn.com/api/mcp --header 'Authorization: your-value'
```
Replace “your-value” with your key before pressing Enter
Paste the key only into the app’s field, never into a chat or to anyone
Done
Type /mcp in Claude Code
You should see CallChatSyn listed as connected
Done
Try it
Use CallChatSyn and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using CallChatSyn or shows a CallChatSyn tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 5 min

You need a CallChatSyn key (sign up on the maker’s site, may cost money)

Sign up and create a CallChatSyn key
Open the maker’s site, sign up and create an API key for the next step. It may cost money.
Open the CallChatSyn site ↗
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Fill in your key
In the CallChatSyn settings, Authorization is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use CallChatSyn and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using CallChatSyn or shows a CallChatSyn tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 5 min

You need a CallChatSyn key (sign up on the maker’s site, may cost money)

Sign up and create a CallChatSyn key
Open the maker’s site, sign up and create an API key for the next step. It may cost money.
Open the CallChatSyn site ↗
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Fill in your key
In the CallChatSyn settings, Authorization is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use CallChatSyn and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using CallChatSyn or shows a CallChatSyn tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Addresshttps://callchatsyn.com/api/mcp

JSON settings are under “For developers” below

Stuck? Ask people who use CallChatSyn💬 Discussion →

For developers: Terminal commands and JSON settings

Over the web

Claude Code

claude mcp add --transport http callchatsyn https://callchatsyn.com/api/mcp --header 'Authorization: your-value'

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "callchatsyn": {
      "url": "https://callchatsyn.com/api/mcp",
      "headers": {
        "Authorization": "your-value"
      }
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "callchatsyn": {
      "type": "http",
      "url": "https://callchatsyn.com/api/mcp",
      "headers": {
        "Authorization": "your-value"
      }
    }
  }
}

Values you fill in

Authorization secret HTTP header
Optional. 'Bearer ccs_live_…' from Dashboard > Developers. Without it, the public demo business is used and bookings are dry runs.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 0
Downloads per weeki: Not on npm/PyPI
Verified domain: ✓ callchatsyn.com
Licence i: MIT
Connection: Runs in the cloud
Transport: streamable-http
Latest versioni: 0.1.0
Categoryi: Other
Published to registryi: Oct 6, 2026
Code last changedi: Oct 6, 2026
Maker: oneappsworld
Repo: oneappsworld/callchatsyn-mcp
Website: callchatsyn.com
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Open WebUI Raycast

All apps, with pros and cons →

What it can do

Tool names and descriptions exactly as the server reported them on Nov 8, 2026. The maker wrote them, not us; we show them as plain text.

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

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 12, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain callchatsyn.com (the registry checks domain ownership)
✓ Pass
Still maintained
Code last changed 37 days ago
✓ Pass
Has a licence
Uses MIT
✓ Pass
Endpoint responds
Responded in 413 ms (HTTP 200)
– Not applicable
Sign-in with OAuth
No sign-in needed
✓ Pass
No hidden instructions in tool descriptions
Read 4 tool descriptions and found no hidden instructions to the AI

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Otheri

More stars than 0% of the other 19273 servers in this category
Published to the registry more recently than 56% of the other 19273 servers in this category
Basic checks equal to or better than 100% of the other 19273 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is CallChatSyn safe?

It passed 5 of 5 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: Authorization

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed 37 days ago, and the latest version (0.1.0) reached the registry 37 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT Business and above.

What can I use instead?

In the same category: World Monitor, Claude Flow, Tldraw

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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by koala73Widely used★ 90.5KUpdated today

Runs in the cloud✓ worldmonitor.app

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Claude Flow

AI orchestration with hive-mind swarms, neural networks, and 87 MCP tools for enterprise dev.

by ruvnetWidely used↓ 13.5K/wk★ 81.5KUpdated 14 months ago

Runs on your computer

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Tldraw

Draw and visually collaborate with your agents on tldraw's canvas.

by tldrawWidely used★ 51.4KUpdated 8 months ago

Runs in the cloud

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

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

Tool	Changes data?	What it does
`answer_customer_question`	No (read-only)	Answers from the business's FAQs and order data (English/Chinese); flags booking and "talk to a person" requests
`list_open_times`	No (read-only)	Next open times (up to 5, next 7 days) in the business's time zone, plus services and locations; from CallChatSyn hours or the business's connected Cal.com
`book_appointment`	Yes, creates a booking	Books one of those times and returns its `id`; the business is notified and, with Cal.com connected, the booking is created there. Not idempotent. Demo key = dry run
`cancel_appointment`	Yes, cancels a booking	Cancels a booking by `id` (also in Cal.com if connected). To reschedule: cancel, then book a new time. Demo key = dry run

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 ccs_live_.... Also listed in the official MCP Registry as com.callchatsyn/callchatsyn.

Local setup (npx)

Create a CallChatSyn account, add FAQs and opening hours, then Dashboard → Developers → claim founder access → create an API key.
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 CALLCHATSYN_API_KEY out and the server uses the public demo key (ccs_demo_public): 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.

CallChatSyn

Overview

What you can do with it

Install

Sign up and create a CallChatSyn key

Open Claude’s Connectors page

Click “+ Add” → “Add custom connector” and fill in these 2 fields

Turn it on in a chat

Try it

What you can do instead

Sign up and create a CallChatSyn key

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Sign up and create a CallChatSyn key

Click this button to open Cursor

Fill in your key

Open the AI chat in Cursor in Agent mode

Try it

Sign up and create a CallChatSyn key

Click this button to open VS Code

Fill in your key

Open the AI chat in VS Code in Agent mode

Try it

Over the web

Values you fill in

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Otheri

Common questions

Alternatives

World Monitor

Claude Flow

Tldraw

README from the maker

CallChatSyn MCP server

Tools

Remote server (nothing to install)

Local setup (npx)

Notes