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Use when designing new features, evaluating architecture, or resolving scalability concerns. (triggers: architecture, design, system, scalability)'\n---\n\n# System Design & Architecture Standards\n\n## **Priority: P0 (FOUNDATIONAL)**\n\n## Architectural Principles\n\n- **SoC**: Divide into distinct sections per concern.\n- **SSOT**: One source, reference elsewhere.\n- **Fail Fast**: Fail visibly when errors occur.\n- **Graceful Degradation**: Core functional even if secondary fails.\n\n## Modularity & Coupling\n\n- **High Cohesion**: Related functionality in one module.\n- **Loose Coupling**: Use interfaces for communication.\n- **DI**: Inject dependencies, don't hardcode.\n\n## Common Patterns\n\n- **Layered**: Presentation → Logic → Data.\n- **Event-Driven**: Async communication between decoupled components.\n- **Clean\u002FHexagonal**: Core logic independent of frameworks.\n- **Statelessness**: Favor stateless for scaling\u002Ftesting.\n\n## Distributed Systems\n\n- **CAP**: Trade-off Consistency\u002FAvailability\u002FPartition tolerance. See [CAP & Consistency Patterns](references\u002Fdistributed-systems.md).\n- **Idempotency**: Operations repeatable without side effects. See [Idempotency Patterns](references\u002Fdistributed-systems.md#idempotency).\n- **Circuit Breaker**: Fail fast on failing services. See [Resilience Patterns](references\u002Fresilience-patterns.md).\n- **Eventual Consistency**: Design for async data sync. See [CAP & Consistency Patterns](references\u002Fdistributed-systems.md#eventual-consistency).\n\n## Documentation & Evolution\n\n- **Design Docs**: Write specs before major implementations.\n- **Versioning**: Version APIs\u002Fschemas for backward compatibility.\n- **Extensibility**: Use Strategy\u002FFactory for future changes.\n\n## References\n\n- [Distributed Systems & CAP Theorem](references\u002Fdistributed-systems.md)\n- [Resilience Patterns (Circuit Breaker, Bulkhead, Retry)](references\u002Fresilience-patterns.md)\n\n## Anti-Patterns\n\n- **No god classes**: Single Responsibility — one reason to change per module.\n- **No synchronous coupling**: Prefer events or queues for cross-service calls.\n- **No premature abstraction**: Design for current load; scale when proven needed.\n\n","# System Design & Architecture Standards\n\n## **Priority: P0 (FOUNDATIONAL)**\n\n## Architectural Principles\n\n- **SoC**: Divide into distinct sections per concern.\n- **SSOT**: One source, reference elsewhere.\n- **Fail Fast**: Fail visibly when errors occur.\n- **Graceful Degradation**: Core functional even if secondary fails.\n\n## Modularity & Coupling\n\n- **High Cohesion**: Related functionality in one module.\n- **Loose Coupling**: Use interfaces for communication.\n- **DI**: Inject dependencies, don't hardcode.\n\n## Common Patterns\n\n- **Layered**: Presentation → Logic → Data.\n- **Event-Driven**: Async communication between decoupled components.\n- **Clean\u002FHexagonal**: Core logic independent of frameworks.\n- **Statelessness**: Favor stateless for scaling\u002Ftesting.\n\n## Distributed Systems\n\n- **CAP**: Trade-off Consistency\u002FAvailability\u002FPartition tolerance. See [CAP & Consistency Patterns](references\u002Fdistributed-systems.md).\n- **Idempotency**: Operations repeatable without side effects. See [Idempotency Patterns](references\u002Fdistributed-systems.md#idempotency).\n- **Circuit Breaker**: Fail fast on failing services. See [Resilience Patterns](references\u002Fresilience-patterns.md).\n- **Eventual Consistency**: Design for async data sync. See [CAP & Consistency Patterns](references\u002Fdistributed-systems.md#eventual-consistency).\n\n## Documentation & Evolution\n\n- **Design Docs**: Write specs before major implementations.\n- **Versioning**: Version APIs\u002Fschemas for backward compatibility.\n- **Extensibility**: Use Strategy\u002FFactory for future changes.\n\n## References\n\n- [Distributed Systems & CAP Theorem](references\u002Fdistributed-systems.md)\n- [Resilience Patterns (Circuit Breaker, Bulkhead, Retry)](references\u002Fresilience-patterns.md)\n\n## Anti-Patterns\n\n- **No god classes**: Single Responsibility — one reason to change per module.\n- **No synchronous coupling**: Prefer events or queues for cross-service calls.\n- **No premature abstraction**: Design for current load; scale when proven 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