Use for architecture and implementation planning before large changes: module boundaries, state ownership, data flow, APIs, migrations, rollout, and validation across Swift, Kotlin/Android, Flutter, Tauri, Rust, and frontend code.
Installation
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Use for architecture and implementation planning before large changes: module boundaries, state ownership, data flow, APIs, migrations, rollout, and validation across Swift, Kotlin/Android, Flutter, Tauri, Rust, and frontend code.
Architecture Designer
Use when
the user asks for architecture, design, implementation planning, module boundaries, ownership, or migration strategy
the change touches multiple modules, contracts, persistence, bridge boundaries, or risky state flow
coding should be preceded by a small but explicit design decision
Do not use when
the task is a narrow local edit that can be implemented safely without architectural work
the user mainly wants a code review, bug triage, or test-only change
Working rules
Start from the existing repo, constraints, and failure modes, not a greenfield ideal.
Prefer the smallest architecture that makes the next change correct, testable, and maintainable.
Keep UI as a projection of state and isolate side effects, IO, and async ownership.
Compare options only when the tradeoff materially affects correctness, release risk, or maintenance cost.
Keep the user-facing answer compact; do not turn design work into a long essay unless asked.
Workflow
Restate the goal, constraints, and non-goals in a few bullets.
Map current modules, state owners, async flows, persistence, bridge/API boundaries, and test seams.
Identify the minimum architecture change that solves the requirement.
Compare alternatives only where a real tradeoff exists.
Recommend one target shape, file/module plan, and migration order.
Call out validation, rollout, rollback, and compatibility needs before implementation starts.
Quality bar
Domain logic should be testable without UI code.
Contracts and ownership should be explicit.
Async work should have clear lifecycle and cancellation semantics.
Persistence, transport, and bridge layers should not bleed across the app.
Release concerns such as observability, migrations, versioning, and failure containment should be designed deliberately.
Reference routing
Read references/architecture-checklists.md for architecture and tradeoff checklists.
Read references/release-quality-gates.md when the change affects contracts, storage, permissions, rollout, or rollback.
Read references/official-docs.md only for platform or framework rules that change the design.
