How to Write a Good AI Prompt: A Simple 4-Part Formula

A prompt is simply what you type to the AI. Most people type short questions and get generic answers back. The difference between a useless answer and a great one is almost always the prompt, not the tool.

Why short prompts give weak answers

Imagine asking a new colleague, "Write an email to the client." They would immediately ask: which client? About what? Formal or friendly? How long?

The AI has the same questions, but it will not ask them. It will guess. And guesses are generic.

The 4-part formula

Give the AI the four things a good colleague would need:

Part	Question it answers	Example
Role	Who should the AI act as?	"You are an experienced accounts executive."
Task	What exactly do you want?	"Write a polite payment reminder email."
Context	What background does it need?	"The invoice is 15 days overdue. The client is a long-term customer."
Format	How should the answer look?	"Under 120 words, with a clear subject line."

You do not need all four every time, but the more you include, the better the answer.

Before and after

Before:

Write a payment reminder.

You will get a stiff, generic letter that you have to rewrite completely.

After:

You are an experienced accounts executive at a small trading company.
Write a polite payment reminder email to a long-term customer.
Context: invoice no. 2045 for ₹48,500 was due 15 days ago. We value the
relationship and do not want to sound rude, but we need payment this week.
Format: a subject line, then an email under 120 words, ending with a clear
request to confirm the payment date.

This answer will usually need only small edits before you send it.

Improve the answer by replying

Your first prompt does not have to be perfect. Treat it as a conversation and refine:

"Make it shorter."
"Make the tone warmer."
"Add a line offering to resend the invoice."
"Give me two more versions so I can choose."
"Ab isko Hindi mein likho."

Tip: If you find yourself rewriting the same thing every time, put that instruction into your first prompt next time. That is how your prompts get better.

Two extra tricks

Ask it to ask you questions. When you are not sure what details matter, end your prompt with:

Before you answer, ask me any questions you need to do this well.

Give an example. If you want a particular style, paste a short example and say "Write it in the same style as this."

Practice task

Think of one real piece of writing you need to do this week: an email, a message, a short report. Write a prompt for it using all four parts: Role, Task, Context, Format.

Then improve the answer with at least two follow-up replies. Save the final prompt somewhere (a notes app is fine). You will build on it in lesson 7.

Key takeaways

Vague prompts get generic answers because the AI has to guess.
Use the formula: Role, Task, Context, Format.
Refine the answer with short follow-up messages instead of starting again.
When unsure, ask the AI to ask you questions first.