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From final review: the loop guard bounded the depth of smart albums
testing smart albums, but not repeated work. Each album tested by the
next one twice ("all of: album is X(k-1), album is X(k-1)") doubled the
cost per level, so 25 levels meant 2^25 evaluations per photo, enough
to freeze the sidebar's counts. Any agent or catalog file could build
such a chain.
rules::smart_album_holds remembers each smart album's answer for each
photo during one outermost question, and forgets them when it ends (a
drop guard, however it ends). A regression test counts a 26-deep
doubled chain in well under its 2 s limit; before the fix it ran for
minutes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>