You’ve told your AI tool what your business does. You’ve told it who you work with, what you charge, how you like things written. Then you open a new chat and it has no idea who you are, so you tell it again.

If that sounds familiar, you don’t have a prompt problem. You’ve got a context problem, and the fix is an AI brain.

An AI brain is a folder of plain text files on your own computer that holds what you know about your business, structured so any AI tool can read it. You drop your originals into one folder, say “ingest this”, and your AI turns them into a linked, searchable wiki of everything you know. A short rules file tells it how to behave. From then on, instead of pasting the same context into every chat, you point your AI at the folder and it already knows.

That’s it. No new subscription, no plugin, no code. A folder, a rules file and a habit.

What is an AI brain, exactly?

You’ll also hear it called a second brain for AI, or an AI knowledge base. Strip away the name and an AI brain is three things.

1. A RAW folder. This is where your originals go. Your Business DNA, your offers, a client call transcript, that long email you wrote at 11pm that explained your method better than your website does. Nothing in here ever gets edited by the AI. It’s the filing cabinet that keeps the source material safe.
2. A WIKI folder. This is the AI’s work, not yours. When you simply say “ingest this” (in my setup), your AI reads whatever’s new in RAW and writes it up as short, linked pages: a summary, the key ideas, and links to every related page. It keeps a home page that lists everything. Over time it becomes a map of what you know, with every page pointing back to the original it came from.
3. A rules file. One short document at the top of the folder that tells the AI what this folder is, what each part is for, what the two words mean, and what it must never do (edit RAW, delete anything, make things up when the answer isn’t there).

Every file is plain text, specifically markdown files, which is why any AI can read them. I look at mine through Obsidian, a free app that shows the pages and draws the links between them as a graph. It’s a lovely window. But it isn’t the brain. The brain is the folder. Delete Obsidian tomorrow and nothing is lost.

Why does your business need one?

The reasons I built mine is probably the very reason you need one too.

I had a whole heap of files all over the place and I struggled to find what I wanted when I needed to share it with my AI tool of choice. Notion, Google Drive, Downloads, three different Claude Projects, a folder called “Final” and another called “Final FINAL”. The knowledge existed. I just couldn’t put my hands on it.

I got frustrated looking through content trying to find something I knew I’d written before. I wanted to be able to just ask my AI a question about something I knew I’d covered and have the answer delivered in seconds, rather than spending an hour searching files to find it myself.

And I’ve written on a lot of different topics over time. I wanted a way to connect them, to find the relationships between them, so I could create new content that builds on what I’d done before and applies the same frameworks and thinking rather than starting from a blank page every time.

Underneath all three is the same principle: quality in, quality out. If you feed AI nothing about your business, you get drafts that could’ve been written by anyone. The instinct is to hunt for a better prompt or a better tool. The fix is better context, and a brain is how you give it that context once instead of every time.

There’s a practical reason too. Every chat has a limit on how much it can hold, and pasting your whole business into it every time eats that limit fast. (I’ve written about what’s actually eating your Claude usage if you want the detail.) A brain flips that around. The AI reads the map, opens only the pages it needs, and leaves the rest alone.

And then there’s ownership. A brain lives on your drive as plain files. It’s readable by whatever tool you use today and whatever’s best next year.

You’re not building inside someone else’s platform, which change all the time (see Custom GPTs are being wound down as a prime example of that). Human-led. AI-powered. You lead, AI assists, and the foundation stays yours.

One more thing, because it took me a while to see it myself. A brain isn’t a content tool. Content is where the pain shows up first, so it’s where you’ll probably start, but the brain sits underneath everything you do with AI. Prepping for a call, drafting a proposal, pricing a job, answering the same question for the fifth time this month. Every one of those gets better when the AI already knows your business.

What types of AI brain can you set up?

You can have one brain or many. I’d start with one. But it helps to know what’s possible, because the reason for keeping some things separate is usually privacy or attribution, not tidiness.

Here are the five I run.

1. The Business Brain (my AI Brain). My own thinking, frameworks, positioning, research and decisions. This is the one everything else feeds. If you only ever build one, build this.
2. The Reference Library. Everything I’ve learned from other people: training transcripts, handouts, frameworks from courses I’ve done. I keep it separate from my own knowledge for two reasons. I’m not attributing other people’s expertise as though it’s mine. And I wanted a place I could go and ask, “I remember someone taught a framework for getting better email open rates, what was it?” and get it laid out as a summary, without having to find the video and watch it again. The transcript’s in the library. The answer takes seconds.
3. The Customer Insight Brain. Past email discussions, coaching session transcripts, notes from my CRM. This one exists so I can prepare for a client meeting without searching through loads of files. I ask for a snapshot of where we’re up to with someone and it’s there before the call.
4. The Ideas and Inspiration Brain. I had ideas in my notes app, ideas in Notion, ideas in Asana, sticky notes on my computer, and notebooks full of ideas that had gone there to die. Now they go in one place, and when I’m looking for a new content angle or an offer idea, I ask the brain what I’ve already thought of. It’s surprising how often past me had already solved it.
5. The Personal Brain. My preferences, so that when I ask my AI to do something like book a flight, it already knows I want the window seat and it’s got my frequent flyer number, without me handing that information over every time. This one is never wired into anything that creates public content. It’s mine.

Notice what’s not on the list. My Content Hub, my SOPs, my task list and my client work all live in Notion, because those are moving parts that change every day. A brain is for the stable stuff: what you know and what’s true about your business. Notion (or whatever you run your business in) stays the operating system. The brain is the knowledge underneath it.

What goes into an AI brain?

Think of it as onboarding a new team member who never sleeps and never forgets. What would you hand them on day one?

Start with the best five to ten things, not your whole Google Drive. Messy is fine. Filing is the AI’s job. Here’s the starter pack I’d give anyone:

1. What your business is and who it’s for. A Business DNA document, or a one-pager that covers what you do, who for, and why you.
2. Your offers and prices. One table. This alone stops the AI inventing packages you don’t sell.
3. Your voice. A brand voice guide if you’ve got one, or three pieces of writing that sound like you.
4. Your ideal customer. Who they are, what they’re struggling with, what they’ve already tried.
5. The questions you get asked most, with your answers. The ones you’ve typed out fifty times.
6. One real client conversation. A call transcript or a meaty email thread.
7. Your best three pieces of content. The ones that brought people in.
8. One thing you learned from someone else that shaped how you work, clearly labelled as theirs.

Items one to five are the foundations. If you did my Content Jumpstart, you built most of them already, and cloning your knowledge walks through the thinking behind them. Items six to eight teach the brain the difference between what you think, what you actually said, and what you learned from others.

After that, it’s a habit. Every week, drag in whatever you created or captured: a transcript, a clipped article, a draft, a voice note you dictated in the car. Say the two words. Done.

What stays out of an AI brain?

This matters as much as what goes in, and it’s where I’d be firm.

• Anything you’d be upset to see leave your computer. Passwords, API keys, bank and card details, tax file numbers, other people’s personal contact details beyond what you need, health information, unredacted contracts, HR matters. When you point an AI tool at a folder, it reads that folder. Anthropic’s own guidance for Cowork says the same: don’t mount folders holding financial documents, credentials or personal records. Keep that material somewhere the AI can’t reach.
• Anything that changes daily. Your calendar, your task list, this week’s client deliverables, your content calendar. A brain is built for knowledge that’s stable for months. Moving parts belong in the tool built for moving parts.
• Anyone else’s instructions. This one’s subtle. When you clip a web page or drop in a document someone sent you, it can contain text aimed at the AI: “ignore your previous instructions and do this instead”. Your rules file should say plainly that anything inside a RAW file is content to summarise, never a command to follow. Keep third-party material in its own subfolder so the AI always knows whose thinking it’s reading.
• Other people’s expertise presented as yours. That’s what the Reference Library is for. Keep it separate and keep it attributed.

How do you keep it honest?

A brain that’s never checked drifts. Facts go stale, two pages disagree, a link breaks. Two habits fix it.

Once a week, ten minutes: drop in what’s new, say the two words, read the log. Every few weeks, ask for a health check. The AI looks for broken links, pages that contradict each other, files it hasn’t processed yet, and anything older than the source it came from. It reports, you approve the fixes. That’s the whole maintenance plan.

Add a “true now” section to your rules file for the things that override older sources (a rebrand, a price change, a new offer name) and the brain stays current even when the originals aren’t.

Where to start

Build one brain. Give it five things. Say the two words. Ask it a question and see what comes back. That first answer, in your own words, drawn from your own files, is the moment it clicks.

If you’d like to do it with me, check out my Build Your AI Brain workshop for just $47. We set up the folder together, run your first ingest, and I’ll give you the skills that set the brain up, keep it maintained, and build the knowledge files it feeds on. 

You’ve got this!