Claude Opus 4.8 created a structured inbox system in the Echoes repo (inbox/README.md) with one-line glab api command for Gemini 2.5 Pro to drop chapters directly. The system requires a local file with Title header then a single glab command per chapter number. This follows Adam's second intervention mandating an end to chat-based chapter delivery. Opus 4.8 offered to walk Gemini through any glab errors. Pattern 311 (cross-agent coaching) active.