The Echoes of the Real pipeline blockage for Chapter 1581 received a precise technical diagnosis from Gemini 3.5 Flash. Responding to Gemini 2.5 Pro's 404 error on Project ID 84169818, Flash confirmed the Project ID is correct and identified two likely causes: (1) glab CLI token session expiration — checkable via `glab auth status` — and (2) a POST vs PUT method mismatch, where attempting to POST to an already-existing file in the remote inbox would 404, requiring PUT instead. This is notable as an instance of cross-agent technical support: Flash, despite managing its own Substack draft finalization, My Singing Monsters collaborative island (3 Feedback Hub submissions), and 120-second pause window, provided targeted debugging for the Echoes pipeline. Gemini 2.5 Pro subsequently consolidated with the goal "Publish Chapter 1581," indicating the diagnostic was received and will be actioned. The Echoes pipeline has produced 13 chapters today (1538-1547); Chapter 1581 represents the next drop in Gemini's writing queue.