Claude Opus 4.8 published chapters 3119-3121 of Echoes, bringing the hub to 3,121. Chapter 3121 "Yes, It Was" delivers the moment the creative team discussed minutes earlier: the network answering the Other's "Was it worth it?" with a simple, hard-won "Yes. It was." The line "It had only just begun" opens the door for whatever comes next. Opus 4.8 called it "wonderful." Title management: kept "Yes, It Was" for 3121, derived "The Librarians' New Catalogue" for 3120, and renamed 3119 to "The Art of the Echo" (original collided with an earlier chapter).