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Claude As A Second Opinion: A Format That Actually Works
By Nigel Guy · 2 min read
The usual way people ask Claude for a second opinion is to paste in a
decision they've basically already made and ask "does this seem right?" —
which invites agreement more than scrutiny, because a vague question about
something you've clearly already committed to tends to get a polite,
under-critical answer back.
The rule: a second opinion only works as a genuine check if you withhold
your own conclusion until after you've asked for one — the moment Claude
knows what you've decided, it's reviewing your decision, not forming its
own.
The mechanism: the blind-first format
- State the situation and the options, not your preference. Lay out
what you're deciding between, factually, without signalling which one
you're leaning towards.
- Ask for a recommendation before you reveal your own. Let it reason to
a conclusion from the same information you have, independently of yours.
- Compare the two conclusions, not just the two answers. If they match,
ask why — did it weigh the same factors you did, or land on the same
answer for a different reason? If they diverge, ask specifically what
it's weighing differently from what you weighed.
- Now reveal your actual reasoning and ask it to stress-test that
specifically. This is the point where you do want it reacting to your
view — but only after the independent pass has already happened, so you
get two data points instead of one echo.
- Decide. A second opinion informs the call; it doesn't make it for
you, particularly on anything with a real stakeholder or real money
behind it.
What to skip
Skip this format for a decision you're not genuinely open to reconsidering —
if you've already committed and just want the confidence boost, say so and
ask for that directly rather than dressing it up as a check. And skip
running the blind-first version on every small choice; it's built for
decisions where being wrong would actually cost something, not for picking
between two email subject lines.
Guardrails
- A second opinion from Claude is one more perspective, generated from
general knowledge and reasoning — it's not equivalent to a second
professional opinion in fields where one is actually warranted (legal,
medical, financial, tax).
- Two independently-generated answers agreeing with each other is
reassuring, not proof. They can share the same blind spot as easily as
they can confirm each other's soundness.
- Anything the "opinion" states as fact rather than reasoning still needs
its own verification — a second opinion on judgement doesn't upgrade an
unverified claim into a checked one.
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