A
Tier reflects current route usefulness, not confirmed hidden stats.
Clean The Library Insight Ability
Insight matters most near the end of a run, when one misplaced book or wrong volume order can make a shelf look finished but fail to complete.
late clearmissing booksstuck shelves
Insight is listed in community references; this page uses it as a role concept, not as proof of exact detection behavior.
Use this ability when
Best route situations
A shelf looks full but the progress badge or completion state does not trigger.
Players are unsure whether a book belongs to the visible row.
A co-op run needs one dedicated auditor instead of more random collection.
Be careful when
Situations to avoid
The run is still early and most shelves are visibly empty.
You need movement or carry help more than diagnosis.
Related routes
Use the ability inside a real run plan
Ability value changes by map section, team role, and whether the run is a casual clear, timed clear, or source-watch endgame attempt.