yt-chapters The rules, which are not optional A chapter list that breaks any of these silently does not become chapters at all - the block just sits in the description doing nothing: - The first entry must be 00:00 . - There must be at least three . - Each must be at least 10 seconds long. The tool checks all three and tells you when a list is invalid rather than letting you paste it. Retitle every line finds the BOUNDARIES well - it scores the pauses you actually took by how much the vocabulary shifts across them. The titles it emits are the topic words, and they are a draft. A chapter calle…