Writing prompts that get useful answers

Most disappointing answers come from missing information, not from a weak model. Claude cannot see your screen, your inbox, or your plans. It sees the words you send. Good prompting is mostly the habit of putting the right words in.

The four parts

A strong prompt usually covers four things. You do not need a formula every time, but when an answer disappoints, check which part was missing.

1. Context. Who you are, who the output is for, and what is going on.
2. Task. What you want done, as a clear instruction.
3. Constraints. Length, tone, things to avoid, facts that must stay unchanged.
4. Format. A list, a table, an email, three options, plain paragraphs.

A weak prompt and a better one

Weak:

Write a follow-up email.

Better:

I run a small bakery. Yesterday a customer asked about
a wedding cake order for 80 guests in June, and I
quoted a range. Write a friendly follow-up email,
under 120 words, asking for the date and flavors.
Do not mention price again. Sign it "Dana".

The second one costs thirty seconds more to write and saves several rounds of fixing.

Show an example

When you care about style, paste one example of what good looks like and say "match this tone and structure." Examples are often more precise than adjectives. "Warm but brief" means different things to different people. A sample email means one thing.

Ask for questions first

If the task is big or vague, say: "Before you start, ask me up to five questions that would help you do this well." Answer them, then let it proceed. This turns a guess into a conversation.

Ask for reasoning where it matters

For decisions, comparisons, or math, ask Claude to lay out its reasoning or its assumptions, then give a recommendation. You can then challenge a specific step instead of an opaque conclusion.

Iterate instead of restarting

You are in a conversation. If the result is close, say what to change: "Shorter. Keep the second paragraph. Drop the joke." Specific edits beat starting over. If a conversation goes off the rails, starting a fresh one with a better first message is also fine.

Be honest about uncertainty

Tell Claude what you do not know. "I am not sure whether this applies to Oregon; flag where the answer depends on the state" produces a more careful response than pretending you know.

Common mistakes

• Packing five unrelated tasks into one message.
• Leaving out the audience.
• Forbidding things without saying what to do instead. "Don't be formal" is weaker than "write like a friendly neighbor."
• Accepting the first answer for something important.

Try it

Pick a real message you need to write this week. Write it as a weak prompt first and send it. Then rewrite it using the four parts and send that. Compare the two replies side by side. Write down in one sentence what the second prompt contained that the first did not. That sentence is your personal prompting rule.