You'll notice
Useful2 Signal1
A broken terminal size warns once instead of spamming or silently guessing.
What's wrong with this entry?
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What
If your terminal reports an unusable window size, Claude Code now logs a single warning instead of repeating it or silently falling back to a default size.
Evidence
warnGarbageWinsizeOnce
Strings lifted out of the shipped bundle, so the claim above can be checked against them.