How to rewrite a prompt for better results

A practical rewriting process: how to identify what is missing, restructure for clarity, and iterate without starting from scratch.

← Back to guides

The rewriting process

Step 1 — Diagnose before rewriting: identify the gap between what you got and what you wanted. Is the format wrong? Is information missing? Is the scope too broad? Rewriting without a diagnosis produces the same problems with different words.
Step 2 — One change at a time: change one element per iteration (the goal, the constraints, the format, an example). If you change everything at once, you cannot tell which change fixed the problem.
Step 3 — Make the goal explicit: most weak prompts leave the goal implicit. Write it as a one-sentence success criterion — what does the output look like when it is correct?
Step 4 — Add a negative constraint: if the model kept doing something wrong, explicitly forbid it. 'Do not include disclaimers' or 'No bullet points, only prose' are more reliable than hoping it will stop.
Step 5 — Add one example: if format consistency is the problem, show one example of the desired output before the task. This outperforms five paragraphs of instructions.

What usually needs fixing

Missing output format: the model has no idea what the result should look like and makes a reasonable guess — which often differs from what you wanted.
Implicit audience: the model defaults to a general tone when you needed something specific to an audience, level, or role.
Missing context: the model fills gaps with generic content when it lacks the specific facts or constraints of your situation.
Conflicting instructions: 'be concise' and 'be thorough' in the same prompt produce inconsistent, mediocre results. Pick one or define the trade-off explicitly.

Templates

Prompt self-critique and rewrite

I have a prompt that is not producing the output I want.

Original prompt:
"""[paste your current prompt]"""

What I got (describe or paste):
[describe what the model returned]

What I actually wanted:
[describe the ideal output in 1–3 sentences]

Identify what is missing or unclear in the original prompt and rewrite it to produce the desired output. Only change what is needed. Explain what you changed and why.

Opens on home with the prompt prefilled.

Open in Promptea

Side-by-side output comparison

I want to understand why one prompt version works better than another.

Version A (original):
"""[paste version A]"""

Version B (revised):
"""[paste version B]"""

Analyze the structural differences between the two prompts and predict which will produce more consistent, useful output for the goal below:
Goal: [what success looks like]

Return:
- Which version is stronger and why
- The one thing Version B does better
- Any remaining gaps in Version B

Opens on home with the prompt prefilled.

Open in Promptea

FAQ

How many rewrites does it take before a prompt is good?

For most tasks, 2–3 targeted iterations. If you are still getting poor results after 5 rewrites, the problem is usually in the task definition, not the wording — clarify what success looks like before rewriting again.

Should I start from scratch or rewrite incrementally?

Start incremental: identify the single biggest problem, fix it, and test. Starting from scratch discards what already works and makes it impossible to identify what changed. Only start over when the original prompt has fundamental structural problems (e.g., conflicting goals that cannot be resolved with additions).