AI Guides › Prompting
The One-Sentence Test For Whether Your Prompt Is Actually Clear
By Nigel Guy · 2 min read
People assume a prompt is clear because it's clear to them — they know what
they meant. That's not the test. The test is whether someone with none of
your context could read it and produce roughly the thing you wanted, and
almost nobody actually checks that before sending.
The rule: before you send a prompt, try to state its request back in one
plain sentence — if you can't, the prompt isn't clear yet, no matter how long
or detailed it is.
The mechanism
- Write the prompt as you normally would.
- Now summarise, in one sentence, what you're actually asking for — as
if explaining it to a colleague who hasn't seen the prompt. "I'm asking it
to turn these five bullet points into a client-ready paragraph, under 100
words, no jargon."
- Check that sentence against the prompt. If the one-sentence version
contains a constraint the prompt itself never stated (length, audience,
what to exclude), add it. The gap you just found is exactly what would
have produced a mismatched answer.
- If you can't produce the one-sentence version at all, that's the real
signal — it usually means you're asking for two or three different things
at once, and the prompt needs splitting, not polishing.
Why length isn't the same as clarity
A long prompt can still fail this test — it can bury the actual ask under
context, caveats, and half-formed alternatives. A short prompt can pass it
easily if it's precise. The test isn't about word count; it's about whether
the request has a single, statable shape.
What to skip
Skip running this test on every trivial, one-off question — it's built for
prompts you're about to reuse, hand to someone else, or rely on for
something that matters. And skip treating a passed test as proof the answer
will be right; it only proves the question was clear.
Guardrails
- This test catches unclear asks, not wrong assumptions baked into the ask.
A perfectly clear prompt built on a false premise still produces a
confidently wrong answer.
- If two people summarise the same prompt differently, the prompt is
ambiguous regardless of how clear it felt to whoever wrote it — this is
worth actually trying with a colleague on anything important.
- Passing this test is a floor, not a guarantee. Clear input raises the odds
of a useful answer; it doesn't remove the need to check the output.
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