01
Turn on Cloud MCP in Kaption
In WhatsApp Web with the Kaption extension (Chrome or Edge), open AI Assistants (MCP) › Cloud Bridge › Enable. In the Kaption desktop app, switch on Cloud MCP in Settings. Keep Kaption open while ChatGPT works.
MCP · ChatGPT
Find any WhatsApp message with ChatGPT
Ask in plain words: “when did the landlord say he’d fix the boiler?” ChatGPT searches your WhatsApp through Kaption, across chats or in one conversation, voice-note transcripts included, and quotes what it finds with the sender and date.
MCP server address
https://mcp.kaptionai.com/mcpShort answer
How do I find an old WhatsApp message with ChatGPT?
Connect WhatsApp to ChatGPT with Kaption’s MCP server, then describe what you are looking for: a word, a person, a rough date. ChatGPT runs a text search across your chats, or inside one chat, through Kaption on your computer, reads the messages around each match and quotes them with who sent them and when. It is unlimited in your first 60 days; after that it uses your plan’s monthly credits.
What do I need to do this in ChatGPT?
Kaption open on your computer (the extension in WhatsApp Web, in Chrome or Edge, or the Kaption desktop app) with Cloud MCP on, a Kaption account (every account starts with 60 days of Business, unlimited; after that, a plan with credits), and ChatGPT. Setup takes three steps:
- 02
Create the app in ChatGPT
Turn on Developer mode in Settings › Apps › Advanced settings (Connectors on some plans), click Create, name it WhatsApp, paste https://mcp.kaptionai.com/mcp and choose OAuth.
- 03
Sign in and pick it in a chat
Enter your phone number and the 6-digit code Kaption sends you on WhatsApp. Then pick the WhatsApp app from the tools menu in a ChatGPT conversation.
What should I ask ChatGPT?
Copy a prompt, paste it into ChatGPT and change the names to your own chats and contacts.
Find the message where Diego promised to send the invoice. When did he say it, and has he sent it since?
Search my chats for “tracking number” in the last two weeks and list each match with the sender.
What address did Ana send me for Saturday’s dinner?
Did anyone in the Building group mention the water cut? Quote the messages.
Search my WhatsApp for every message that mentions “deposit” and make a table: date, chat, sender, amount.
What can ChatGPT do here, and what can’t it?
It can
- Search message text across all your chats, or inside one chat, for a word or a phrase.
- Search the text of voice notes Kaption has transcribed, so a promise made in audio can turn up too.
- Read the messages before and after a match, so it can tell a real promise from a joke.
- Narrow the search by chat, contact, label or list, and by date, then quote each match with sender and time.
- Work wherever your ChatGPT plan and workspace allow custom MCP apps. If you don’t see Developer mode, ask your workspace admin or check OpenAI’s help center.
It can’t
- Search locked chats. They are never visible to the assistant.
- Search inside photos, PDFs or other files: text search covers messages and voice-note transcripts.
- Promise it found everything. Search matches words, so if nothing comes back, ask again with other wording or the person’s name.
- Search while Kaption is closed on your computer.
What leaves my computer?
The search itself runs in Kaption on your computer. Only the matching messages, and the messages around them that ChatGPT asks for, are sent back to ChatGPT.
Kaption’s relay at mcp.kaptionai.com checks your sign-in and passes each request to Kaption on your computer, which runs it against your WhatsApp and sends back only the answer; the relay does not keep your chats. What comes back, such as message text, names and numbers, goes to ChatGPT, which handles it under its own privacy terms. Locked chats are never visible to the assistant, and you can disconnect at any time.
How many credits does my plan include?
Claude and ChatGPT are unlimited in every account’s first 60 days; after that they need a plan, counted in credits per calendar month: Lifetime local AI 50, Pro 250, and Business 500 with its 2 numbers plus 250 for each extra number, shared by all its numbers, the plan to pick when an assistant uses WhatsApp every day. Business Agent includes them with fair use. A read uses 1 credit, a send 2 and a summary 3. See plans and prices
Questions
Can ChatGPT search voice notes?
Yes, once they have a transcript. Kaption’s search covers the text of transcribed voice notes, so ChatGPT can find something that was said in audio. A voice note with no transcript yet has no text to search.
Does it search every chat or just one?
Both. Name a person or group to search one conversation, or leave it open to search across all your chats.
How many searches can I run?
Each search ChatGPT runs is a read and uses 1 credit. Every account is unlimited for its first 60 days; after that, Lifetime local AI includes 50 credits a month, Pro 250 and Business 500 with its 2 numbers. One question can take two or three reads when ChatGPT reads the messages around a match.
Which ChatGPT plan do I need?
One that lets you add a custom MCP app with developer mode. OpenAI changes which plans and workspaces allow it, so if the option is missing, check OpenAI’s help center or ask your workspace admin.
Connect WhatsApp to ChatGPT
Turn on Cloud MCP in Kaption, add the address to ChatGPT and sign in with a code on WhatsApp.
Set up WhatsApp in ChatGPT