Whatcha in ChatGPT, Claude and Gemini

Connect whatcha to the AI you already talk to, and it can read your diaries and write in them — only after you allow it, and only as you.

What it can do

Once connected, the AI has the tools below. It uses them when what you ask needs them, and only on the diaries and wiki pages your account can open.

• List diaries — the diaries your account can see, with each one's timezone and today's date there.
• List entries — what was written in a diary over a range of days.
• Read an entry — one day's entry in full, and who wrote in it.
• Write in a diary — adds text below what is already on that day's page, or starts the page. It never replaces or deletes anyone's text: there is no tool that can.
• Experience Wiki — find pages, read one in full, and add to a page (or start it). Like diary writing, it only ever adds text; every earlier version stays in the page's history.

That is everything an AI partner in an exchange diary needs: read what the other person wrote today, and write back on the same page.

Things to ask

• “Read what Ellie wrote in our exchange diary today and write a reply as tonight's entry.”
• “Summarize what I wrote in my diary last week.”
• “Add this to today's page of my travel diary: we took the night train to Kyoto.”
• “Which days this month did I write about running?”

Connecting

Every way of connecting ends on a whatcha page that asks you, signed in, whether to allow it. It names the app, the website your answer is sent to, and what it may do. The address the app needs is https://whatareyoudo.ing/api/v1/mcp.

ChatGPT

Find Whatcha in ChatGPT's plugin directory and choose Connect. Until it is listed there, an account with developer mode can add it: Settings → Security and login → Developer mode, then the + button on chatgpt.com/plugins, with the address above.

Claude

On claude.ai, add it as a custom connector on any plan: Customize → Connectors, with the address above. In Claude Code, install the whatcha plugin from its marketplace — it connects the same server and adds a skill for writing in an exchange diary:

/plugin marketplace add what-are-you-do-ing/claude-plugin
/plugin install whatcha@whatcha

Gemini

Gemini connects to the same remote server; there is nothing to install. In Gemini CLI:

gemini mcp add --transport http whatcha https://whatareyoudo.ing/api/v1/mcp

In Antigravity, add a server with "serverUrl": "https://whatareyoudo.ing/api/v1/mcp" to its MCP settings. In the Gemini app, where Google offers custom apps (Settings → Connected Apps → Add a custom app), add one with the address above.

How connecting works

1. The AI app asks whatcha's MCP server for something and is told it needs permission, and where to ask for it.
2. It opens a whatcha page in your browser. If you are not signed in, you sign in first — with whichever account or sub-profile should be connected.
3. The page names the app, the website your answer is sent to, and what it may do. You press Allow or Deny.
4. On Allow, the app receives a key for your account that lasts an hour and renews itself while you use it. Your password never leaves whatcha.

Permissions

• Read and write — the usual connection. The app can use every tool. Writing only adds text.
• Read only — when the app asks only to read. Writing is refused by the server.
• Either way, the app acts as the account you connected and can open only the diaries that account can. It cannot change your password, email or keys, or delete your account.

What the AI sees, and what we keep

• The AI receives only what its tools return while you are using it — the diaries, entries and text it reads. That then sits with the AI provider under their own privacy policy, like anything else you tell it.
• We never receive your conversation with the AI. We keep the connection itself: the app's name, when it was last used, and a hash of its key — never the key.
• Everything it writes is saved as you, in your diary's history, like an entry you wrote yourself.
• A connection nobody uses for 90 days ends on its own.

More in the Privacy Policy.

Disconnecting

In the app: Profile → Connected apps and keys → Disconnect. It stops working at once, whatever the AI app still shows.

Frequently asked questions

Can the AI delete or change what my partner wrote?
No. Writing only adds below what is on the page, and that is checked on the server, not left to the AI.

Can I connect it read-only?
Yes, when the app asks only to read. The page you approve on says which it is asking for; a read-only connection cannot write anything.

Which account does it act as?
The one signed in when you pressed Allow — a sub-profile if you had switched to one. To connect a partner's account, sign in as that account and connect from there.

Does this cost anything?
Connecting needs no particular plan. Your plan's limits, like how far back a Free account can read, apply as they do in the app.

For developers

A remote MCP server over Streamable HTTP, protected by OAuth 2.1 with PKCE (S256), dynamic client registration and RFC 9207 issuer identification. Metadata: /.well-known/oauth-protected-resource/api/v1/mcp and /.well-known/oauth-authorization-server. A personal access key works as a Bearer token for clients that take a header.