I think the MAIN thing on specs is to just make sure you have them, and get the models to ask you clarifying questions. You don't really need a skill or process for that, just ask the model to ask you questions on a spec.
I am not so convinced yet that subagents with haiku and sonnet really deliver better results versus opus, nor if the speed really matters that much if you are truly autonomous. I mean he is talking about saving like 20 minutes here. There are 24 hours a day, you are much more likely to be gated by product specs and knowing what you want and good ideas than engineering if you are hammering things now.
I am not so convinced yet that subagents with haiku and sonnet really deliver better results versus opus, nor if the speed really matters that much if you are truly autonomous. I mean he is talking about saving like 20 minutes here. There are 24 hours a day, you are much more likely to be gated by product specs and knowing what you want and good ideas than engineering if you are hammering things now.