Built-in skill — system architecture design.
Injects a system-prompt section that walks the model through requirements → components → interfaces → data flow → trade-offs → scalability → failure modes, and requires every architectural decision to be written up as Decision / Context / Alternatives / Consequences.
Activates on prompts containing "architect", "design system", "system design",
"how should i structure" or "component design". Group :planning;
tags :architecture, :design, :system.