SOLID was written for this moment

If You dont write code - who you are? Everyone is talking about prompts. About token budgets. About cognitive surface. But I think we're still looking at the wrong unit. The unit is the interface boundary . Always was. Back before any of this existed Back when I was writing SQL scripts and mappers by hand, I already had this principle baked into how I worked: every module should know only its contract. Not where the data came from. Not where it goes. Just: here's input, here's output, here's the