A frustrating gap I'm hitting in the skills spec. TL;DR: I want three tiers of 'invocable'. User-invocable, skill-invocable, and model-invocable. Skill-invocable skills are only invocable by the user, or by skills. Skills can be marked as model-invocable or user-invocable. Model-invocable skills put their description into context. User-invocable skills are hidden from the model, so no tokens are burned on the description. But what about skills that you want to BOTH invoke on their own…