How to Write a Good AI Prompt (Simple Formula)
Written for parents, people getting started later in life, small business owners, and creators.
Last updated October 16, 2026
A good AI prompt explains who the answer is for, what you want, the tone you prefer, and the format you need. You can remember it as: who + what + tone + format. Plain language works well.
Use four simple parts
A prompt is simply the message you give an AI tool. You do not need special commands. Add enough detail for the tool to understand the job.
- Who: the person who will read or use the answer.
- What: the task you want completed.
- Tone: friendly, calm, direct, warm, or another style.
- Format: a short email, checklist, table, text message, or set of steps.
Before and after
A vague prompt might say, “Write about my sale.” The tool has to guess the audience, the facts, and the length.
A clearer version says, “Write a friendly two-sentence message for regular customers about our Saturday sale. Use only these facts: [add facts]. End with one invitation to visit.” The second prompt gives the tool a job and limits.
Ask for one change at a time
The first answer does not have to be final. You can say, “Make it warmer,” “Use shorter sentences,” or “Put this in a checklist.”
Keep the useful facts in the conversation. Correct anything that is wrong. You are still the editor and the decision-maker.
A simple example
A small business owner needs a note about an order delay. The owner knows the real details and wants a calm message. The prompt uses all four parts of the formula.
Write a message for a customer whose order will arrive later than expected. Use a calm, helpful tone. Keep it under 90 words and leave blanks for the order number and new delivery date. Do not invent a reason for the delay.
What to look for
- The reader is clear: one customer waiting for an order.
- The job, tone, and length are all stated.
- Unknown facts stay blank instead of being invented.
Try this
Help me write a friendly text message for a family member. I need to change our meeting time. Keep it under 50 words. Leave blanks for the old time and new time. Do not add a reason I did not give you.
After you read the draft, ask for one change. For example: “Make it sound warmer, but keep it short.”
Common mistakes
- Using only a topic“Birthday party” is a topic, not a task. Ask for a plan, list, message, or explanation.
- Forgetting the readerSay whether the answer is for a customer, child, family member, coworker, or you.
- Leaving the format openAsk for the shape you need, such as five bullets, a short email, or three steps.
- Adding private informationUse blanks or made-up placeholders instead of real account, health, customer, or family details.
- Trying to fix everything at onceAsk for one clear change, read the new version, and continue if needed.
Questions people ask
What is an AI prompt?
A prompt is the message or instruction you give an AI tool. It can be a question, a request, or a set of facts followed by a task.
How long should a prompt be?
Long enough to include the useful facts and limits. A clear sentence can be enough for a small task. A complicated task may need a few short paragraphs.
Do I need special prompt words?
No. Write in normal language. The useful parts are the reader, the task, the tone, and the format.
What if the first answer is bad?
Tell the tool what is wrong and ask for one change. You can also start again with clearer facts and limits.
Should I say please?
You can write naturally. Polite language is fine, but clarity matters more than a special phrase.
Can I reuse a prompt?
Yes. Save a useful prompt as a template, then replace the facts and read every new answer before using it.