Research suggests that telling Claude what NOT to do ('Don't include lengthy preambles') is generally less effective than what alternative approach?
Select an answer to reveal the explanation.
Short Explanation and Infographic
Negative instructions make Claude think about the thing you don't want. Positive instructions tell it exactly what you do want. 'Start with the answer' beats 'Don't add preamble' every time.
Full explanation below image
Full Explanation
Prompt engineering research and practice consistently shows that positive instructions (specifying desired behavior) outperform negative instructions (specifying what to avoid). 'Don't use bullet points' is less effective than 'Use numbered lists only.' 'Don't be verbose' is less effective than 'Keep responses under 3 sentences.' This is analogous to human communication — it's easier to follow 'turn left at the stop sign' than 'don't go right, don't go straight.' Options A, C, and D all describe formatting tricks for negative instructions — they may marginally help but miss the fundamental point that positive instruction framing is more reliable.