# 5.12 — Chat SSE event types (GREEN)

Phase: 5 — Chat + Rate Limiter (Surface D)
Stage: GREEN

Depends on: [5.7](5.7-api-chat.md)

- [ ] Chat SSE events: `{"type":"reasoning"|"content"|"queue"|"done"|"error"}` — render `reasoning_content` in collapsible block (this is the demo)