Seven Prompt Mistakes That Quietly Ruin Your Results

Bad prompts do not fail loudly. You still get an answer, it is just vaguer, longer or less useful than it could have been. These are seven common problems, each with a quick fix.

1. Asking for everything at once

"Write a business plan for my bakery" asks for forty pages of work in one go, so you get a thin outline of everything. Split big jobs. Ask for the customer research first, react to it, then move on to pricing. Each step gets full attention, and you can correct the course early.

2. Hiding the important part in the middle

If your prompt is one long paragraph, the key instruction is easy to lose, for the model and for you when you reuse it later. Put the input in a clearly marked block, for example inside <draft> tags, and put the instructions in a numbered list.

3. Saying what you do not want, and nothing else

"Do not be too formal" leaves a thousand options open. Say what you want instead: "Write the way you would explain it to a friend over coffee. Short sentences." Negative rules are fine as extras, but lead with the positive description.

4. No example of "good"

If you have a piece of writing, a report or a function that you like, paste it and say "match this style". One real example beats three paragraphs of description. Mark it clearly as an example so that Claude copies the style and not the content.

5. Letting the model invent facts

Whenever a task involves your data, add an honesty rule: "Use only the facts I gave you. If something is missing, ask me or write UNKNOWN." This one line prevents most made-up numbers, names and quotes.

6. Accepting the first answer

The first response is a draft. The most useful follow-ups are short:

• "Shorter, and cut the introduction."
• "Give me three more options for the second paragraph only."
• "What is the weakest part of this, and how would you fix it?"

That last one is surprisingly effective. Claude is often a better critic than first-draft writer.

7. Starting from zero every time

If you have written a prompt that works, save it. Replace the specifics with placeholders in capitals, like [AUDIENCE] and [PASTE YOUR DRAFT], and keep it somewhere you can find it. That is exactly what the prompts on this site are: tested structures with blanks to fill in.

A one minute fix

Take the last prompt that disappointed you and check it against this list. Most of the time the problem is number 1, 2 or 5, and the fix takes less than a minute.

Want to see these ideas applied? Browse all prompts, or start with this week's top three on the home page.