SOS (urge.tsx) uses /api/coach/message as a stateless LLM proxy for game comments, share drafts and the stream fallback — sending SOS_BOOT + [INTERN:] prompts. The endpoint persisted the full messages array into coachSession for pro/legend users, so those internal prompts and the raw JSON replies leaked into the Coach chat history as visible bubbles. - Reactivate the sosMode flag (already sent by all three SOS call-sites): when set, the endpoint skips coachSession persistence, memory extraction and feedback detection — pure LLM proxy, no shared state. - Add a defensive filter on /api/coach/history that strips internal messages (SOS_BOOT, [INTERN:], [SYSTEM-HINT], raw JSON / [[CHIPS]] replies) so already-contaminated sessions self-heal on next load. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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