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 commits on a feature branch are messy, out of logical order, mix unrelated changes, or need restructuring before a PR - also triggered by "clean up history", "reorganize commits", "recompose
