---
description: ARS deep-research `three-way-scan` mode — WHY / HOW / WHAT paper comparison
model: sonnet
---

Trigger the `deep-research` skill in `three-way-scan` mode. Produces a compact paper shortlist compared by WHY / HOW / WHAT plus a cross-paper synthesis (common WHY, divergent HOW, strongest WHAT, unresolved gap). Lighter than `lit-review`; escalate to `lit-review` / `systematic-review` for full coverage. Fidelity spectrum, low oversight.

Mode reference: `MODE_REGISTRY.md` § deep-research.
Skill entry: `deep-research/SKILL.md`.
