Component System in Godot 4.3+

Build behavior through composition. Attach small, focused components to any entity rather than climbing an inheritance chain. All examples target Godot 4.3+ with no deprecated APIs.

Related skills: scene-organization for scene tree composition, event-bus for decoupled component communication, resource-pattern for data-driven component configuration, physics-system for Area2D/3D overlap detection and collision shapes, ability-system for an AbilityComponent example built on this pattern.

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1. Why Components

Problem with inheritance	How components solve it
Deep chains are brittle, change one class, break many	Each component is an isolated scene with a single job
Sharing behavior across unrelated entities requires awkward base classes	Drop a component onto any entity that needs that behavior
Adding a new combination means a new subclass	Mix and match components freely at the scene level

Key benefits:

• Reuse across entities, a HealthComponent works on a player, an enemy, a destructible crate, or a boss with no code changes.
• Separation of concerns, damage detection, health tracking, and state animation are each their own file. Debugging is local.
• Mix-and-match behaviors, give an enemy a HitboxComponent and a PatrolComponent independently. Removing one does not affect the other.

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2. Component Design Rules