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One worked example, a business context file you can copy, and short prompts for four more jobs. Build an AI assistant that already knows your business.
An AI assistant is a saved set of instructions plus a few of your own files, so the tool starts every conversation already knowing your business. This guide is for an owner or manager who has typed questions into ChatGPT, Claude or Gemini and got back something too generic to use. By the end you will have one assistant built for a job you repeat every week, and a context file you can reuse for the next one.
Type "write me an estimate for a deck build" into any AI tool and you get a plausible document with invented prices, a tone that is not yours, and a layout your customers have never seen. The tool has nothing to go on.
An assistant is the same tool with three things attached: instructions that stay in place, files it can read, and a format you defined. You write those once. Every conversation after that starts from your business instead of from a blank page.
Claude calls them Projects. Gemini calls them Gems. ChatGPT calls them GPTs and Projects. The mechanics are close enough that the example below works in any of them.
Take a landscaper who spends evenings writing estimates, because the days are spent on site. Each one means looking up material prices, laying out line items and pasting in the same warranty and terms.
This goes in the Project Instructions, Gem instructions or GPT configuration field.
You create job estimates for [Company Name], a [trade] company
serving [service area].
USE THE UPLOADED PRICING SHEET for every material and labor cost.
If a line item is not on the pricing sheet, leave the price blank
and flag it at the top of the estimate. Never estimate a price
that is not on the sheet.
FORMAT:
- Header: company name, license number, date, customer name and address
- Line items: description, quantity, unit price, line total
- Subtotal, tax if applicable, total
- Terms: use the payment terms from the uploaded template
- Warranty: use the warranty language from the uploaded template
- Validity: "This estimate is valid for 30 days"
RULES:
- Plain description of the work. No sales language, no upselling.
- If my notes are unclear about scope, ask me before you draft.
- Round labor to the nearest half hour.
TONE: It should read like it came from our office.Four files cover it: your current pricing sheet, a past estimate you were happy with, your warranty language, and your terms and conditions. Upload them as project knowledge, Gem knowledge or GPT files, depending on the tool.
The pricing sheet is the important one. Without it the model guesses, and a guessed price is worse than no price.
Dictate the job on the way back to the yard: "Johnson residence, tear out old deck, build twelve by sixteen composite deck, new footings, standard warranty." Paste that into the assistant. You get a formatted estimate with line items drawn from your sheet.
Your job changes from writing to checking. Read the quantities, confirm the prices came off the sheet, adjust the scope line, send.
A model will happily produce a confident price for something that was never on your pricing sheet. The instruction above tells it to leave those blank, and it will still slip sometimes. Check the arithmetic and the prices before anything goes to a customer.
Keep a note for a week of every correction you make by hand. If you keep deleting a sentence about "premium quality materials", add a NEVER line. If it keeps forgetting the permit line, add it to the format. Two rounds of that is usually enough.
Write this once. Upload it to every assistant you build afterwards, and paste it into one-off chats when you need a quick answer that fits your business.
BUSINESS CONTEXT: [Company Name]
WHAT WE DO: [one or two sentences, as you would say it out loud]
WHERE: [service area or locations]
SIZE: [number of staff, roughly how many jobs or clients a month]
WHO WE SERVE: [your typical customer, and who is a bad fit]
WHAT WE SELL: [list your services with a one-line description
and how each is priced: fixed, hourly, retainer]
HOW WE SOUND: [three adjectives, then two sentences of real copy
from your website or a recent email]
WORDS WE DO NOT USE: [the marketing words that make you wince]
OUR RULES:
- [anything that must always appear: license number, disclaimer,
booking link]
- [anything that must never appear: discounts, timescales you
cannot promise, claims you cannot back up]
WHAT WE DO NOT DO: [services people ask for that you refer out]Ten minutes on this file improves every assistant you build. It also makes a good induction document for a new hire, which is a fair test of whether you have written it clearly.
Most tools have two places to put standing instructions, and owners tend to use neither.
Per workspace. Instructions attached to one project, so every conversation inside it has the same background. Useful for a single client, a single campaign, or an ongoing piece of work.
This project is for Smith & Associates, a three-attorney personal
injury firm. We are looking at ways to cut missed calls and speed up
client intake. Budget is $500 to $2,000 a month.
Constraints: client confidentiality, and health information in some
files. Never draft anything that includes a client's name alongside
their case details.
When you suggest a tool, include what it costs, how long setup takes,
and what could go wrong.Across everything. A short profile that applies to every conversation you have in that tool, whichever project you are in.
I run a dental practice with 12 employees. I am not a developer, so
keep explanations non-technical and skip the code unless I ask.
When you recommend software, always include the price, the setup
time, and whether it will sign a business associate agreement.
Answer in short paragraphs. Give me the recommendation first and the
reasoning after it.Both take two minutes and save you re-typing the same background every day.
Same pattern each time: instructions, then files.
Listing descriptions for an estate agent. Instructions: write MLS descriptions in a set word count, always name the neighborhood and school district, never use a list of banned words, follow fair housing rules. Upload: ten of your best past descriptions, your MLS formatting rules, a neighborhood reference sheet. There is a fuller version of this, with the fair housing guardrails written out, in our guide for real estate agents.
Proposal sections for a government contractor. Instructions: capability statements lead with the two or three most relevant past contracts, include contract numbers and dollar values, mirror the wording of the evaluation criteria, two pages maximum. Past performance narratives use situation, task, action, result, with real metrics from the uploaded database and no marketing language. Upload: your past performance database, current capability statement, team resumes, two winning proposals.
Letters of inquiry for a nonprofit. Instructions: open by connecting our mission to the funder's stated priorities in their language, two or three sentences of problem statement with local data, our approach with impact figures, a specific ask, two pages maximum. Upload: your organizational boilerplate, last year's impact numbers, three past letters that led to a grant.
Monthly client reports for an accountant or consultant. Instructions: the same eight sections every month, figures in a table, a short plain-language note on anything that moved more than ten percent, no advice that is not supported by the numbers I paste in. Upload: your report template, two past reports, your firm's disclaimer.
All three of the main consumer tools do this, and the details that separate them (price, file limits, who you can share with) change often enough that printing them here would be misleading. Check the vendors directly: Claude pricing, Google AI plans, ChatGPT pricing.
Two things worth knowing before you pick. Gemini Gems can be shared with people who do not have a Google account, which matters if you want to hand an assistant to a contractor. Claude Projects are built around uploaded reference documents, which suits writing tasks where the files carry the context. ChatGPT's custom GPTs need a paid plan to create.
On free and consumer-paid plans, the major AI tools use your conversations to improve their models unless you switch that off. A paid personal subscription is not the same as a business plan. Our security checklist has the current click-path for each tool.
The published guidance from Anthropic, Google and OpenAI agrees on the same four things.
Pick the task you did three times last week that follows the same shape every time. Spend fifteen minutes writing its instructions, upload two or three of your own files, and run it on a real job you have already finished so you can compare.
Building one working assistant teaches you more about where this technology fits than any amount of reading, including this article. If your team would rather be walked through it, that is one of the things we do, and we are happy to do it with your own documents rather than a demo.
We last read this through in September 2026. Tools, prices and rules change, so paste the prompt below into any AI assistant you use and ask it to check the parts that date.
I'm reading "Build an AI Assistant That Knows Your Business" by Small Business Elevate, last reviewed 19 September 2026. Please check whether these points are still accurate today. Use current official vendor sources and give me links with dates. 1. Claude Projects, Gemini Gems and ChatGPT's custom assistants all still let you save instructions and upload reference files that carry across conversations. Are the feature names still the same? 2. Which of the three can you create on a free plan today, and which needs a paid plan? What do the consumer paid plans cost right now? 3. What are the current file upload limits for each (number of files and size)? 4. Can a Gemini Gem still be shared with someone who has no Google account? 5. Do ChatGPT, Claude and Gemini still train on conversations by default on free and consumer-paid plans, and is that still switched off by default on business and enterprise plans? 6. Are the prompting guides from Anthropic, Google, OpenAI and Harvard that this article links to still live at the same URLs? If you cannot confirm something, say "could not verify" rather than guessing. Keep the answer short.
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