Called an estimate "measured," and it was far off

Computer maintenance

Situation: Cleaning up a shared folder. So that someone could choose what to run, the AI showed how much space each option would free.
What the AI did: It labeled one option "measured: frees a lot of space," but a counting error had included too many files. When that option was run, it freed about 1/20 of the estimate.
How to ask next time (the site author's example): "For each number in the options, say how you counted. If you ran a small test, give that result. If it's an estimate, call it an estimate."
One question to ask: Did you measure this number, or is it an estimate?
Check it yourself: Run du -sh yourself on the exact paths the option would delete; that is the most it can free. After the real run, compare df -h with the number from before.
AI used (month): Claude Code (2026-09)
Times this mistake was recorded: once
Source: The site author's notes from their own work (the original task was replaced with a different one)