Designs, writes, tests, and improves Claude Code skills (SKILL.md packages) to a production quality bar. Use this whenever the user wants to create a new skill, turn a repeated workflow or prompt into something reusable, review or fix a skill that triggers unreliably, split an overgrown SKILL.md or CLAUDE.md, or decide whether a piece of guidance belongs in a skill, a hook, a subagent, or CLAUDE.md at all — including when they say "make this repeatable", "capture how I do this", "why isn't Claude using my skill", or describe doing the same multi-step task a third time without using the word "skill".
