Training completion is the most gamed metric in corporate life: the video plays in a background tab, the completion logs, the knowledge transfer never happens. Everyone knows; the checkbox survives because the alternative — assessing whether people actually absorbed the material — requires writing assessments, and nobody's writing forty quizzes for forty training videos.

The gap matters most where training is load-bearing: compliance, security awareness, tool onboarding. "Watched" and "understood" are different claims, and only one of them is what the training was for.

library_list inventories the training collection — modules by tag, the assessment to-do list made visible. run_youtube_tool's quiz-generator writes the assessments: a quiz per video, drawn from what the video actually teaches, regenerable so repeat-takers can't just memorize answer keys.

Completion upgrades from checkbox to comprehension signal: pass the quiz, not just play the video. And the wrong answers aggregate into L&D's real product — the confusion map: which module's material consistently doesn't land, which is either a content problem or the topic that needs a live session. The forty-quiz backlog becomes an afternoon.