01
Your AI app
Claude, ChatGPT, Cursor or another MCP client asks for something, like "summarize today's Sales group".
MCP · AI assistants
Connect WhatsApp to your AI assistant Claude, ChatGPT, Cursor and any MCP client
Kaption's MCP server lets an AI assistant search your chats, summarize conversations, find contacts and set reminders, with your permission and only while Kaption is open on your computer.
MCP server address
https://mcp.kaptionai.com/mcpTry asking
- Summarize what the Sales group talked about today.
- Find the address Maria sent me last week.
- Which chats have I not answered since Friday?
- Remind me tomorrow at 9 to follow up with Carlos.
What is a WhatsApp MCP server?
A WhatsApp MCP server lets an AI assistant such as Claude, ChatGPT or Cursor search your WhatsApp chats, summarize conversations, find contacts and set reminders; Kaption’s is at https://mcp.kaptionai.com/mcp and works through Kaption running on your computer. Turn on Cloud MCP in the Kaption extension or desktop app, add the address as a custom connector in your assistant and sign in with a code sent on WhatsApp; the assistant can schedule a message after you confirm it, and it can send one from your computer unless you turn off “Let assistants send messages from this computer” in Kaption.
Unlimited for your first 60 days; after that Claude and ChatGPT need a plan, in credits a month: Lifetime local AI 50, Pro (US$11.99 a month) 250, Business (US$19.99 a month) 500 with its 2 numbers plus 250 per extra number; Business Agent: included, fair use.
Updated
How the connection works
- 02
Kaption relay
mcp.kaptionai.com checks your sign-in and passes the request along. It cannot read your messages.
- 03
Kaption on your computer
The extension in WhatsApp Web, or the desktop app, runs the request against your WhatsApp and sends back only the answer.
Cloud connection
Works with any AI app that can add a remote MCP server (often called a custom connector) and sign in with OAuth.
- 01
Open Kaption on your computer
Use WhatsApp Web in Chrome or Edge with the Kaption extension, or the Kaption desktop app. Sign in to Kaption.
- 02
Turn on the connection
In the extension, open AI Assistants (MCP), choose Cloud Bridge and click Enable. In the desktop app, switch on Cloud MCP in Settings. In Kaption 0.95 and later, open AI assistants, click Add an assistant and choose Claude or ChatGPT.
- 03
Add the link to your AI app
Add a remote MCP server or custom connector with the address below.
MCP server address
https://mcp.kaptionai.com/mcp - 04
Sign in with a code on WhatsApp
Enter your phone number, type the 6-digit code Kaption sends you on WhatsApp, and choose how long the AI app stays connected: while you use it (it disconnects after 90 days without use), for 1 year, or until you disconnect it.
Local connection
Prefer to keep the connection on your computer? The local server talks to Kaption over localhost. It needs Node.js 18 or newer.
- 1Open WhatsApp Web in Chrome or Edge with the Kaption extension, and turn on the MCP bridge in its settings. In the desktop app, switch on Local MCP in Settings.
- 2Add the server to your AI app with one of the snippets below.
- 3Several WhatsApp numbers can be connected at once, and several AI apps can share the same connection.
Claude Code
claude mcp add whatsapp -- npx -y @kaptionai/mcp-extension@latestClaude Desktop, Cursor, Windsurf, VS Code (JSON config)
{
"mcpServers": {
"whatsapp": {
"command": "npx",
"args": [
"-y",
"@kaptionai/mcp-extension@latest"
]
}
}
}What your AI assistant can do
The tools, grouped by what they touch.
Search and read
Search messages and chats, look up contacts and groups, export contacts, download media from a chat, and see chat statistics.
Summarize
Summarize a conversation. The summary is private to you.
Organize
Archive, pin, mute and mark chats read or unread, leave a draft, manage lists and reminders. Labels and notes on WhatsApp Business.
Send and schedule
Schedule a message to one person, up to 800 characters, which Kaption sends at the time you set. It can also send a message from your computer to a person or a group, with one attachment up to 8 MiB, unless you turn off “Let assistants send messages from this computer” in Kaption.
What it cannot do
- Change your sending setting. Sending from your computer is on by default; turn off “Let assistants send messages from this computer” in Kaption → AI assistants → Connections and it stays off, and the assistant cannot turn it back on.
- See chats you locked in WhatsApp.
- Work while Kaption is closed. The extension in WhatsApp Web or the desktop app has to be open.
- Send bulk or unsolicited messages. Our terms forbid it, and we rate-limit access.
Built so you can check it
- The connection is off until you turn it on, and you can turn it off at any time.
- The relay's source code is public, and every deploy is signed and recorded in a public log.
- Sign-in uses OAuth with a single permission scope, and access tokens expire after an hour.
- Reminders and scheduled messages are stored in Kaption Cloud so they can fire on time. Your messages are not.
Try asking
- Summarize what the Sales group talked about today.
- Find the address Maria sent me last week.
- Which chats have I not answered since Friday?
- Remind me tomorrow at 9 to follow up with Carlos.
- Draft a reply to João confirming Thursday at 3 PM.
Questions
Which AI apps work with it?
The cloud connection works with Claude, ChatGPT, Cursor and any MCP client that supports remote servers with OAuth. The local server works with Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed and other clients that run local MCP servers.
Can the AI send WhatsApp messages?
Yes. From Kaption 0.94, sending from your computer is on by default, and Kaption shows a one-time notice the first time an assistant sends. It can send to an existing chat with a person or an eligible group, with one image, document, audio or video file up to 8 MiB. Messages are queued for the earliest permitted delivery, not sent instantly, and are limited to 8 an hour and 20 a day, plus group limits and delays. Your computer and WhatsApp must stay open. You can turn off “Let assistants send messages from this computer” in Kaption → AI assistants → Connections at any time; that also stops messages scheduled from this computer, and the assistant cannot turn it back on. With it off, the assistant can schedule a message to one person or leave a draft for you to send. Older versions keep sending off until you turn it on.
Do my messages go through Kaption servers?
With the cloud connection, requests and answers pass through the relay at mcp.kaptionai.com, which cannot read your messages. With the local connection, nothing leaves your computer except what your AI app itself sends.
How do I disconnect an AI app?
Turn the connection off in Kaption, or remove the connector in your AI app. If you chose "while I use it", the connection also ends after 90 days without use.
Does it work with the desktop app?
Yes. The Kaption desktop app has Local MCP and Cloud MCP switches in Settings.
Does it cost anything?
Every account can use Claude and ChatGPT without limits for its first 60 days. After that they need a plan, in credits a month: Lifetime local AI 50, Pro 250, Business 500 (250 per number); Business Agent includes them with fair use. The pricing page has the details.
Give your AI assistant your WhatsApp context
Install Kaption, turn on the connection, and paste one link into your AI app.