Reusable SKILL.md capabilities that give your agent new expertise — installed into .claude/skills/ and friends.
.claude/skills/
Interview-driven specification development. Use when starting a new project, after context compaction, when SPEC.md is missing or stale, or when the user needs to clarify project architecture. Triggers on "spec", "interview me", "what are we building", or when substantial work is requested without clear requirements.