V3 Core Implementation

Domain-Driven Design structures TypeScript services around bounded contexts and domain logic separated into distinct layers—domain, application, and infrastructure. This Skill implements DDD core modules with dependency injection and strict typing, enabling modular, testable services that scale across task management, sessions, and health monitoring without tight coupling between components.

Microkernel architecture uses pluggable infrastructure components and dependency injection to load domain modules dynamically. This Skill provides DI bindings, event sourcing primitives, and a pluggable infrastructure layer that lets you register and swap domain implementations—task, session, and health domains—without modifying core code.

Testing discipline across domain, application, and infrastructure layers ensures correctness at each abstraction. This Skill includes strong unit and integration tests for task, session, and health domains, demonstrating how to validate domain entities, services, and event handlers while maintaining clean separation that makes testing isolated and repeatable.

Event sourcing captures domain state changes as immutable events, enabling audit trails and event-driven workflows. This Skill implements event sourcing primitives within DDD bounded contexts, letting you source domain events from task, session, and health domains and replay them to reconstruct state or trigger downstream actions.

No external dependencies are required to begin. This Skill provides the core DDD foundation—domain modules, dependency injection setup, and test scaffolding—that you build on. You add testing frameworks, HTTP servers, or databases as needed for your specific deployment and workflow requirements.

Clean architecture isolates domain logic from infrastructure concerns, making services testable, maintainable, and adaptable to new requirements. This Skill demonstrates how separation into layers—domain entities and services, application orchestration, and pluggable infrastructure—lets you change frameworks, databases, or deployment targets without rewriting business logic.