Every time you open Claude or ChatGPT, it has no idea who you are.
Not your name. Not your business. Not what you sell, who you sell it to, or how you like to communicate. Every single session starts from zero.
So you spend the first few minutes of every conversation re-explaining yourself. Your industry. Your audience. Your tone. What you need. And by the time the AI finally catches up, you’ve already burned your patience and half your lunch break.
There’s a fix for this. It takes about 20 minutes to set up, and it works every session after that, forever. We call it the Business Brain Document.
What Is a Business Brain Document?
It’s a short document — roughly 300 words — that tells AI everything it needs to know about your business. Think of it as a cheat sheet for a new hire on their first day. Except this hire has perfect memory and never needs to be told twice.
You write it once. You load it into your AI tool’s Custom Instructions (or paste it at the top of each session). And from that moment on, every answer the AI gives you is already tailored to your company.
No more “write me a marketing email” and getting back something that sounds like it was written for a dentist’s office when you run a construction company.
What Goes In It
Keep it tight. Around 300 words is the sweet spot — enough to be useful, short enough that the AI actually processes all of it. Here’s what to include:
1. Company overview — What you do, in 2–3 sentences. Not your mission statement. What you actually do, day to day.
2. Your customer — Who they are, what they care about, what keeps them up at night. Be specific. “Small business owners” is too vague. “HVAC company owners doing $1M–$5M who are great at the work but drowning in admin” is useful.
3. Your voice and tone — How you sound in emails, on your website, on social. Give the AI 3–5 adjectives and one example sentence. “We sound like a smart friend who happens to be an expert — confident, casual, no jargon.”
4. Products or services — What you sell, pricing tiers if relevant, what makes you different from the obvious alternatives.
5. What you don’t do — Just as important. If you’re a web design agency that doesn’t do SEO retainers, say so. This keeps the AI from suggesting things that aren’t in your wheelhouse.
6. Current priorities — What you’re focused on this quarter. Launching a new product? Hiring? Trying to get more reviews? Update this section every few months.
That’s the whole document. Six sections, 300 words, done.
Where to Put It
Most AI tools have a place for this built in. You just have to use it.
ChatGPT: Settings → Personalization → Custom Instructions. Paste your Business Brain Document there. It loads automatically every conversation.
Claude: Start a new Project, paste the document into the Project Instructions. Every conversation inside that project starts with your context already loaded.
Any tool: Keep the document in a note on your phone or a pinned doc. Paste it at the top of any new conversation. Takes three seconds.
The method doesn’t matter. What matters is that the AI knows who you are before you ask it to do anything.
What Changes When You Use It
Everything gets faster. And better. Here’s what actually shifts:
Emails sound like your company wrote them, not a robot.
Social posts match your voice without you having to rewrite them.
Strategy suggestions are relevant to your actual business, not generic advice.
Customer replies hit the right tone on the first draft.
You stop wasting the first 5 minutes of every session playing catch-up.
The Bottom Line
AI is only as good as the context you give it. Most people give it none, then wonder why the output feels off.
Write your Business Brain Document. 300 words. 20 minutes. And never introduce yourself to AI again.
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