Correcting Claude: Fix a Fact vs. Fix a Tone
"That's wrong, fix it" works about half the time. When the problem is tone, that's usually enough for Claude to find and adjust it. When the problem is a fact, that same sentence often produces a second draft that's differently confident and still wrong, because nothing in your correction told Claude what the right answer actually is.
Warning
Claude can't independently verify a claim the way it can rephrase a sentence. A factual correction needs the right information from you. A tone correction just needs clearer direction.
Telling Claude it's wrong fixes tone. Telling Claude what's right fixes facts.
Why one kind of correction works and the other doesn't
When you say a sentence sounds too formal, Claude has everything it needs to fix it: the target state, a more casual register, is something it can generate on its own. When you say a number or a claim is wrong, Claude has no independent way to know what the correct figure actually is. If you don't supply it, the most likely outcome is a rewritten sentence with a different, equally unverified number in it.
This is the gap that makes "that's wrong, fix it" unreliable specifically for facts. It reads as a complete instruction because it worked the last three times, all of which happened to be tone issues.
Before: flag a factual error the same way you'd flag an awkward sentence, get back a second guess instead of a correction.
After: supply the correct information along with the flag, so Claude has something real to correct toward.
Two different repair processes
- 1
Identify which kind of wrong this is
Ask yourself: does fixing this require new information Claude doesn't have, or just a different way of saying something it already got right in substance? That answer determines which process below to use.
- 2
For a factual error, supply the correct information
Point at the specific claim and give the correct number, date, or detail directly. Don't just say it's wrong: say what's right.
- 3
For a tone or style issue, describe the target directly
Name the direction you want: more casual, shorter, less hedged. No new facts are needed here, only a clearer description of the target.
The second paragraph says our team grew by 40% last year. The actual number is 25%. Correct that figure and check the rest of the paragraph for any other numbers that might need the same fix.
”The tone in this email is too formal for a teammate I talk to daily. Keep the same content, but rewrite it the way I'd actually text someone I work with closely.
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Inside Claude Tutorial
Diagnosing what kind of wrong something is applies broadly.
Separating a factual problem from a stylistic one before you try to fix it is a small habit with a big payoff, and it's one of many the app teaches through short lessons and real practice.
The edge case: when a claim just sounds wrong but you're not sure
Sometimes a number or claim reads as suspicious but you don't actually know the correct figure yourself. In that case, don't guess and don't accept it either. Ask Claude to flag its own confidence instead of asking it to fix something neither of you can verify yet.
If you know the correct fact, supply it directly rather than just flagging the error
If you don't know it, ask Claude to mark which claims it's least confident about, rather than asking it to silently fix an unverified one
Treat a fixed factual claim as needing the same verification the original one did, not as automatically correct now
I'm not certain the 40% figure in the second paragraph is right, and I don't have the correct number in front of me. Flag that claim as unverified rather than guessing at a replacement number.
”A correction that actually sticks is one built on something new, either a fact you supplied or a direction you named, not a repeat of "wrong" aimed at the same gap in information.
Continue reading
- Turning Claude's First Answer Into the One You Actually Need: the general refining skill this article covers one specific, high-stakes case of.
- Knowing Where Claude's Answers Need a Second Check: which categories of claims are worth verifying before you ever get to the correction stage.