extensibility

What problem does it solve?

Every design, plan, and implementation MUST allow new functionality to be added without modifying existing code. The system should be open for extension but closed for modification.

Why this matters: Software that requires modifying core code for every new feature becomes brittle, risky, and slow to evolve. Extensible design lets you add capabilities by writing NEW code — not editing existing, tested, working code. This is the difference between systems that scale with the team and systems that bottleneck at every change.

Core Features & Use Cases

• Open-Closed design enforcement across modules to allow feature growth without touching core logic.
• Explicit extension points with documented interfaces, adapters, and discovery mechanisms.
• Versioning and configuration to maintain backward compatibility and safe evolution.

Use Case: When adding a new plugin or integration, implement changes through a registry-based extension point rather than modifying existing components.

Quick Start

Identify a concrete extension point in your project and implement a simple registry to allow new behavior without modifying existing code.