cqrs-event-sourcing

SKILL.md

Expert guidance for implementing Command Query Responsibility Segregation (CQRS) and Event Sourcing patterns to build scalable, auditable systems with complete historical tracking and optimized read/write models.

Command Query Separation Separate operations that change state (commands) from operations that read state (queries).

| Express intent (CreateOrder, UpdatePrice) | Return data, never change state | | Can be rejected (validation failures) | Can be cached and optimized | | Return success/failure, not data | Multiple models for different needs | | Change system state | Eventually consistent with writes |

CQRS and Event Sourcing patterns for scalable, auditable systems with separated read/write models. Use when building audit-required systems, implementing temporal queries, or designing high-scale applications with complex domain logic. Source: nickcrew/claude-ctx-plugin.

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