Skills（SKILL.md）は、AIエージェント（Claude Code、Cursor、Codexなど）に特定の能力を追加するための設定ファイルです。
詳しく見る →Validates side hustle ideas against real market demand. Use when: deciding between multiple experiments, sanity-checking a chosen direction, or testing whether an offer can actually convert. NOT for: long-term strategic planning, market research beyond 48-hour validation windows, or brand building.