Vague ask
Help me improve my landing page copy. — improve how? for what metric? for whom?
Fix: define what improvement means in this specific case. Make this more direct and remove anything that sounds like marketing speak. Keep it under 80 words.
Asking multiple things at once
One prompt, one question. Multi-question prompts get shallow answers to all of them.
No format specified
You'll get whatever format Claude chooses. Sometimes that's fine. Often it's not. Just say what you want.
Correcting without specifics
That's not right, try again doesn't tell Claude what was wrong. Be surgical: The second paragraph is too technical — rewrite just that part for someone non-technical.
Not telling Claude it's okay to say "I don't know"
Claude will fill gaps confidently if you don't give it permission not to. Add: If you're not sure, say so. I'd rather know the limit than get a confident wrong answer.
Accepting the first output
This is a habit worth breaking. One round of what's weak about this? fix those parts usually makes the output noticeably better. The first pass is a draft, not a deliverable.
Not saving prompts that work
When you find a prompt structure that works for something you do repeatedly — save it. A Notion doc, a text file, anything. It compounds.
Quick Reference
| When this happens | Try this |
|---|---|
| Output format is wrong | Add explicit format instructions |
| Too generic | Add role + specific context |
| Reasoning is off | Add "think step by step" |
| Style isn't matching | Paste an example of what you want |
| Building an automation | XML tags + constrain JSON output format |
| Getting close but not right | Use few-shot examples |
| Not sure if output is right | Ask Claude to critique it |
| Same bad output keeps happening | Update your system prompt |
Updated February 2026. Claude's capabilities evolve, so treat everything here as empirical — try it and see what happens.