Start with one learning move
A useful skill has one job, such as giving increasingly specific hints, asking a student to defend a claim, or checking a draft against a rubric.
Write the boundaries into the skill
The teacher defines the instructions, allowed tools, and point where a student should ask a person for help.
Share after testing
Try the skill with typical answers, incomplete work, and off-topic requests. Share it with a class only after its behavior matches the lesson.