Two modes:
- Idea mode (default) — describe an idea to spike
- Frontier mode (no argument or "frontier") — analyzes existing spike landscape and proposes integration and frontier spikes
Does not require /gsd:new-project — auto-creates .planning/spikes/ if needed.
Available flags:
--quick— Skip decomposition/alignment, jump straight to building. Use when you already know what to spike.--text— Use plain-text numbered lists instead of AskUserQuestion (for non-Claude runtimes).