A diary is only as useful as what you can get back out of it. Logging how you feel, your flares, what you took and ate is the easy part. Looking back across months of it and spotting what matters is harder, especially on a tired day.

So we’ve built something to help with that half: the AI Connector. It lets an AI assistant like Claude read your Health Diary, so you can ask about it in plain words and get answers drawn from your own records. If you want, it can also help you keep the diary up to date.

What you can ask

Once it’s connected, you just start a conversation. A few things people might ask:

  • “What have my hard days had in common this month?”
  • “How does this month compare with last month?”
  • “Do my flares line up with low forecast scores?”
  • “Which of my supplements am I actually taking regularly?”
  • “Which of my open cases should I look at first, and why?”
  • “Help me get ready for my appointment next week.”

The assistant reads what it needs (your days, your flares and symptoms, your cases and the culprits you named, your Findings, your Medicine Cabinet, the forecast) and answers from it. It can look across a whole season at once, which is exactly the kind of looking back that’s hard to do by hand.

It can help keep things up to date, if you let it

Out of the box, an assistant only reads. If you’d like it to do more, there are two switches on your account page, both off until you turn them on:

  • Let it make changes. It can then log things in your diary (how you feel, a flare, a dose, a meal), add and update your Findings (symptoms, discoveries and labs), your Medicine Cabinet, and the answers on your cases. So you can say “I took my cromolyn at 8” or “mark my brain fog as resolved” and it’s done.
  • Let it remove things too. A second switch, only if you want it, lets it delete entries, findings and cabinet items.

Nothing else is on the table: it can’t touch your account, your settings or anyone else’s diary. It only does what you ask, and the switches are checked every time, so turning one off takes effect straight away.

Two ways to connect

In the Claude app. This is the easiest, and it works on your phone, the web and your desktop. In Claude’s settings, add a custom connector with our address, press Connect, and you’ll land on mastcell.net. Log in as you always do, and you’ll see a short page saying what Claude is asking for. Press Allow and you’re done. There’s no key to copy, and no other company’s login involved: it’s your Mast Cell Decoded account, and only that.

With a key. Some tools connect with a key instead, like Claude Code or a settings file in Claude Desktop. Make a key on your account page, paste it in, and that’s it. The AI Connector page shows exactly where, with the commands ready to copy.

Built to be safe with health data

Your diary is some of the most personal information there is, so we were careful about how this works:

  • Reading is the default. An assistant can read your diary, and nothing more until you turn on changes on your account page. Even then it’s limited to your diary entries, Findings, Medicine Cabinet and cases, never your account or settings.
  • Only yours. A connection reads its owner’s diary and nothing else.
  • You’re in control. Every app you’ve connected, and every key you’ve made, is listed on your account page, along with the switches for what it may change. Disconnect one and it stops working at once. Changing your password disconnects every app.
  • Nothing stored that could be reused. We keep only scrambled versions of keys and sign-in tokens, so even we couldn’t use them to get in.

One thing worth saying plainly: when an assistant reads your diary, that information goes to the company behind the assistant, under their privacy policy rather than ours. Connect only an assistant you trust with your health information.

What it isn’t

An AI assistant working with your diary is a powerful way to look for patterns, but it’s not a doctor. Like everything on Mast Cell Decoded, what it finds are patterns, not proven causes, and its answers aren’t medical advice. We even tell the assistant this when it connects, so it frames its answers that way. The best use is as a starting point: something to think about, test against your own experience, and bring to your doctor.

Try it

The AI Connector comes with a subscription, alongside the Health Diary, the Weekly Forecast and everything else, and every new account gets a free week of all of it, no card needed. If you connect it, we’d love to hear what you ask it and what it finds. Get in touch any time.