Overview
Repeated rebriefing is inefficient. It also increases variation because each new description may omit a step that was present previously.
A reusable skill preserves the implementation logic that has already been refined. If an agent has been taught how to produce content in a preferred way, the operator can document that workflow and call it again later. Improvements accumulate in the skill rather than being lost inside an old conversation.
Skills also create a separation between the task and the method. The current task supplies the subject and context. The skill supplies the repeatable process used to complete that kind of task.