Technically, a skill is equivalent to adding '"The skill description": if this applies, read /path/to/skill/definition.md' To your agents.md At least current

Technically, a skill is equivalent to adding '"The skill description": if this applies, read /path/to/skill/definition.md' To your agents.md At least currently skills don't let you set the model (to my knowledge), so that's not a distinction either here (it would be with agent definitions)