design-code-architecture

# Design Code Architecture Design the architecture for a new app: get the small number of expensive-to-reverse decisions right and stay aggressively simple everywhere else. This is an interactive, resumable journey of eight phases — the agent asks before every decision and records the outcome in your project's `docs/` folder, so you can stop after any phase and resume later. It runs from the most foundational and hardest-to-reverse (boundaries, domain) through the tunable (data, resilience) to the cross-cutting disciplines (complexity, reversibility, scope) you apply throughout. A weekend project uses three phases lightly; a funded team building toward launch wants the whole stack. ## Core Principle **Architecture is the set of decisions that are expensive to reverse: make exactly those deliberately, and defer everything cheap.** This skill sequences the phases, asks the decision questions, and records every choice in `docs/`. The constituent skills carry the method — invoke them rather than improvising their frameworks. The whole strategy is to convert expensive decisions into cheap ones by putting a boundary in front of them, so the irreducibly expensive set stays small enough to get right with care. ## Journey Map | Phase | Skill | Question it answers | Artifact | |---|---|---|---| | 1 | clean-architecture | Do source-code dependencies point inward — is the core testable with no DB, web, or framework? | Creates docs/ARCHITECTURE.md | | 2 | domain-driven-design | Where...