Step-by-step SKILL.md packages an AI follows for a single kind of task.
A skill is a focused playbook - instructions, examples and constraints - that makes any model reliable at one job, from SQL reporting to changelog writing. The router fills a plan's skill slot with the best match for the request.
Use when deciding whether to dispatch subagents, when to stay in main context, when facing 2+ independent parallel tasks, or when needing subagent dispatch templates and context minimization guidance.
