sector-rotation-signallisted

# sector-rotation-signal You hand over a rotation window (default 30 days) and get back the current 20-day RS rank per sector, the rank change over the window, and a rotation classification (rotating in, stable, rotating out). Bundled with a plain-English theme read. Rank change is the leading signal. The tape already prices absolute strength; leadership rotation is what tells you the composition of strength is shifting. ## When to invoke - The user asks "what sectors are rotating", "is the market rotating", "growth vs value right now" - market-regime shows the same label two days in a row but you want to know if the underlying composition is changing - Portfolio-review workflow, after market-regime — regime says WHAT, rotation-signal says WHERE-IT'S-MOVING - A single-name research question wants sector context: "is my Tech position bucking the sector rotation" ## What you need - `MASSIVE_API_KEY` (Stocks Starter). One daily-aggs call per SPDR sector ETF + SPY (12 calls total). ## What you get back **Layer 1 JSON** matching [`output-schema.json`](./output-schema.json). Per-sector: current 20-day RS rank, rank in the reference date, rank_delta, 20-day RS in basis points, secondary RS window, rotation classification, category tags. **Layer 2 rendered table** sorted by current rank. Rotation column uses arrows (`↑`, `↑↑`, `↓`, `↓↓`, `stable`) so the visual read is immediate. Theme line above the table. See [`references/rendering.md`](./references/rendering.md)