This is a structured brainstorming step that lives before you start planning or coding. It walks you through a dialogue to define scope, makes you list key decisions with rationale, and surfaces open questions without trying to answer them yet. The real discipline here is YAGNI enforcement: it actively pushes back on scope creep and keeps you from jumping into implementation details. Output gets saved either as a markdown doc using a template or directly into your task backend (Linear, Jira, whatever you've configured in .groove/index.md). It's opinionated about staying in discovery mode, which is honestly refreshing if you tend to solution too early.
npx skills add https://github.com/andreadellacorte/groove --skill groove-work-brainstorm