What a Context File Is
A context file is a document -- typically one to two pages -- that contains the essential information AI needs to do business-specific work. At Build with AI, the primary context file is called the Business Context Document. It has five sections: who you are, your audience, your offers, your voice rules, and your current priorities.
You write it once. You upload it to a Claude Project. Every conversation inside that Project starts with Claude reading your context file before you type your first word. Claude already knows your brand, your audience, your voice, and your current focus.
Why AI Needs One
Without a context file, Claude is a brilliant generalist with amnesia. Every conversation starts fresh. It does not know your name, your business, your audience, or your voice. It produces the most statistically common answer for any prompt -- which is the most generic one.
With a context file, Claude becomes a business-specific partner. It writes in your voice. It speaks to your audience. It references your offers accurately. The same prompt produces fundamentally different output depending on whether a context file is present.
A context file is not optional. It is the single most important thing you can give AI. Everything else -- prompts, techniques, workflows -- produces better results when AI has your context first.
Context File vs Prompt
A prompt is an instruction for a single task. "Write me a LinkedIn post about AI for founders." A context file is background information that applies to every task. "Here is who I am, who my audience is, what I sell, how I communicate, and what I am building this month."
Prompts tell AI what to do. Context files tell AI who you are. The best output comes from strong context plus strong prompts. But if you had to choose one, context is more important. A generic prompt with great context produces better output than a perfect prompt with no context.
What Goes in a Context File
- Section 1 -- Identity: Your name, brand name, what you do in one sentence, your role, your business stage.
- Section 2 -- Audience: A specific person, not a demographic. What does she want? What has she tried? What does she believe that might be wrong?
- Section 3 -- Offers: What you sell, what it costs, who it is for, and the exact language you use to describe it.
- Section 4 -- Voice: Words you never use. Your sentence rhythm. Tone differences across formats. Real examples of your writing.
- Section 5 -- Current state: What you are building right now. Active campaigns. This month's focus. Update this section weekly.
How to Create Yours
Set aside two hours. Open a document. Write each section with as much specificity as possible. Keep it to one to two pages total. Dense and specific, not exhaustive. Upload it to a Claude Project. Test it by asking Claude a real business question without introducing yourself.
If the output reflects your business, your audience, and your voice -- it is working. If it is still generic, go back to sections two and four. Audience and voice are the two sections where lack of specificity creates the most generic output.