A good AI prompt says clearly what you want, who it is for and what the answer should look like. Chatbots such as ChatGPT, Gemini, Copilot and Claude can’t read your mind, so a short, vague request gets a short, vague answer. Adding a sentence or two of detail usually fixes that.
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This guide covers the parts of a strong prompt, shows real before-and-after examples and explains how to steer the answer once it arrives.
What Is a Prompt?
A prompt is the message you type or say to an AI chatbot. It can be a question, an instruction or a piece of text you want changed. The chatbot uses everything in that message, plus the earlier messages in the same chat, to decide how to answer.
That last point matters. Within one conversation, the chatbot remembers what you said before, so you can build on an answer instead of starting again.
The Four Parts of a Good Prompt
The four parts of a good prompt are persona, task, context and format, which is how Google’s prompting guide for its Gemini assistant breaks down a strong prompt. The same idea works with any chatbot.
| Part | What it means | Example |
|---|---|---|
| — | — | — |
| Persona | The role you want the AI to take | “You are a friendly fitness coach” |
| Task | The job itself, using a clear verb | “Write a weekly walking plan” |
| Context | Background the AI can’t guess | “for a beginner who has 20 minutes after work” |
| Format | The shape of the answer | “as a table with one row per day” |
Google points out that you don’t need all four every time. Using two or three is often enough to lift the answer from generic to useful.
Start with a verb
Start with a clear verb such as summarise, rewrite, list, compare, explain, translate or draft, because it gives the AI a clear job and tells the chatbot what kind of answer to produce. “Tell me about note-taking apps” is open-ended. “Compare the main features of three note-taking apps in a short table” is a task.
Before and After: Prompt Examples
Each pair below puts a weak prompt next to a stronger one for writing an email, planning a meal and understanding something new, because the easiest way to see the difference is side by side. Each weak prompt below works, but the stronger version gets a far more usable reply on the first try.
Writing an email
- Weak: “Write an email to my landlord.”
- Stronger: “Write a short, polite email to my landlord asking when the broken kitchen tap will be fixed. I reported it two weeks ago. Keep it under 120 words.”
Planning a meal
- Weak: “Give me dinner ideas.”
- Stronger: “Suggest five vegetarian dinners I can cook in 30 minutes with a basic kitchen. List the main ingredients for each.”
Understanding something new
- Weak: “Explain cloud storage.”
- Stronger: “Explain cloud storage to someone who has never used it, in plain words, using one everyday comparison. Keep it to two short paragraphs.”
Notice what the stronger versions add: the audience, a limit on length, and the format. None of them are long.
Give the AI Examples and Reasons
Showing an example is one of the most reliable ways to get the style you want. Anthropic’s guidance for its Claude models calls examples one of the best ways to steer format, tone and structure. If you want a product description in a certain voice, paste one you like and say “match this style.”
Explaining why also helps. Anthropic’s guide suggests treating the AI like a capable new colleague who doesn’t know your situation. “Keep it short” is fine. “Keep it short because people will read it on their phones” gives the chatbot a reason it can apply to every choice it makes.
A simple test before you press send: would a stranger understand exactly what you want from this message alone? If not, the chatbot won’t either.
How to Improve an Answer With Follow-Ups
Treat the first answer as a draft and keep talking. Google’s guide calls this making it a conversation. You don’t need to rewrite the whole prompt; just say what to change.
Useful follow-ups include:
- “Make it shorter” or “cut this to three bullet points.”
- “Use simpler words” or “explain it for a 12-year-old.”
- “Make the tone warmer” or “make it more formal.”
- “Give me three other versions.”
- “What did you assume that I should check?”
If the chat has drifted a long way from what you need, starting a new chat with a better first prompt is often quicker than correcting it line by line.
Ask the AI to ask you questions
When you’re not sure what details matter, end your prompt with “Ask me any questions you need before you start.” The chatbot will list what it’s missing, and your answers become the context. Google’s guide suggests a related trick for Gemini: ask it to turn your rough request into a better prompt, then use the improved version.
Common Mistakes to Avoid
Most weak answers come from five habits that are easy to fix: packing several jobs into one prompt, leaving out who the answer is for, not saying the length, trusting facts without checking and pasting private details.
- Packing several jobs into one prompt. Ask for one thing at a time, or number the steps clearly.
- Leaving out who the answer is for. A note for a child and a note for a manager need different words.
- Not saying the length. Without a limit, chatbots often write more than you need.
- Trusting facts without checking. Chatbots can state wrong information confidently. Google’s guide reminds users to review output for accuracy before using it, and that matters most for dates, figures, names and anything health, money or legal related.
- Pasting private details. Leave out passwords, card numbers and personal information about yourself or other people.
FAQ
Do I need special words or codes for prompts?
No. Google’s guide recommends natural language, written as if you were speaking to another person in full sentences. Plain, specific wording works better than tricks.
Does the same prompt work in every chatbot?
Mostly, yes. The habits in this guide work across ChatGPT, Gemini, Copilot and Claude, though each tool may format answers a little differently. If one gives a weak reply, adding context usually helps more than switching tools.
