Connect an AI

Your logs, in the AI you already talk to

GrubLog connects to Claude and ChatGPT. Once it’s linked, the AI can read your logs, weight, exercise and targets, and if you allow it, log and change things for you. There’s nothing to install: you paste one address and sign in.

GrubLog’s address

Paste this where the AI asks for a server or connector URL. It works in any app that supports MCP connectors.

In Claude

Works on claude.ai and the desktop app. Once connected, your phone picks it up too.

  1. Open Settings → Connectors

    Click your name at the bottom left, then Settings, then Connectors.

  2. Add a custom connector

    Click Add custom connector. Name it GrubLog, paste the address above, and click Add.

  3. Connect and sign in

    Click Connect. A GrubLog page opens: sign in with the same Google or Apple account you use in the app.

  4. Choose what Claude may do

    Read only lets it look. Read and write also lets it log and change things. You can change your mind later by disconnecting and connecting again.

  5. Start a new chat and ask

    Claude picks up the tools in new conversations. Try “What did I eat yesterday?”

In ChatGPT

Custom connectors need a paid ChatGPT plan, and the option sits under developer settings.

  1. Turn on developer mode

    Open Settings, then Apps & Connectors (or Connectors). Under Advanced, turn on Developer mode.

  2. Create the connector

    Click Create. Name it GrubLog, paste the address above as the MCP server URL, leave authentication on OAuth, and save.

  3. Sign in and choose access

    ChatGPT opens a GrubLog page. Sign in with the account you use in the app, then pick Read only or Read and write.

  4. Enable it in a chat

    In a new chat, open the + (or tools) menu, choose GrubLog under connectors, and ask away.

What it sees

Everything that’s backed up to your account: food, weight, exercise, water, your profile, goal, targets and settings. Never your meal photos, which stay on your phone. If backup is off in the app, there’s nothing for it to read.

What to ask

You can ask in your own words. These are the kinds of questions that work well, because the AI gets real numbers back rather than guessing.

Look back

It reads your actual days, so answers come with numbers.

  • “What did I eat yesterday, and how did it add up?”
  • “Which days did I go over this month, and what pushed me over?”
  • “Compare my weekdays with my weekends.”
  • “Am I getting enough protein? Which meals fall short?”

Log by talking

With read and write on, it logs for you and tells you what’s left.

  • “Log 2 scrambled eggs, 3 slices of turkey ham and a coffee for breakfast.”
  • “I walked for 45 minutes this morning.”
  • “Weighed 279 today.”
  • “Yesterday’s dinner was more like 900 calories, fix it.”

Check on your goal

It compares your plan with what the scale is actually doing.

  • “Is my weight loss on pace?”
  • “What does my real maintenance look like, based on what I’ve eaten and weighed?”
  • “If I keep eating like the last two weeks, where am I in three months?”
  • “I’ve stalled. What would you change first?”

Plan from what you actually eat

It knows your usual foods, so plans look like your life, not a magazine.

  • “I have 600 calories and 40 g of protein left. What could dinner be, from things I usually eat?”
  • “Plan tomorrow’s meals around my targets using my frequent foods.”
  • “Make a saved meal out of my usual breakfast.”
  • “What’s my go-to lunch, and what would a lighter version be?”

Exercise

Workouts count toward your budget, so it can reason about them.

  • “How much have I exercised this month, and on which days?”
  • “I want to eat back more of my walks. Set eat-back to 100%.”
  • “Does my weight move more on weeks I lift?”

Getting the most out of it

  • Start with a question, not a command. “How am I doing this week?” gets the AI reading your data before it suggests anything.
  • Say “ask me before changing anything”. A good AI does that on its own for targets and settings, but you can make it a rule for logging too.
  • Use your own foods. Tell it “the usual” or name a saved meal. It will find what you’ve logged before instead of inventing numbers.
  • Check the app afterwards. Anything the AI logs appears on Today within seconds, and under Settings → Account → Recent AI changes with an Undo.

What it can’t do

  • Override the safety rules. It can’t set targets below the calorie floor, faster than a safe pace, or any deficit for someone under 18 or pregnant. Those requests are refused with the reason.
  • Delete your account or your backup. Those stay in the app, behind their own confirmations.
  • See your photos. Meal photos never leave your phone.
  • Keep access after you disconnect. Remove GrubLog in the AI app, or revoke it from Settings → Account in GrubLog, and its access ends.

Something didn’t work?

Write to grublogapp@gmail.com with the AI you were using and what it said. If the sign-in page says the app isn’t known, that’s expected for apps other than Claude and ChatGPT: they connect read-only.