# Runtime Behavior Extension

> The ability to add responsibilities to an object dynamically at runtime by wrapping it.

Record: `lexicon:runtime-behavior-extension`
Kind: capability
Layer: [Design Patterns Core](https://banes-lab.com/records/layer/design-patterns-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-runtime-behavior-extension

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Recursive Composition](https://banes-lab.com/records/lexicon/recursive-composition.md) and before [Shared Immutable State](https://banes-lab.com/records/lexicon/shared-immutable-state.md).

## Category

- [Structural Patterns](https://banes-lab.com/records/lexicon-category/structural-patterns.md)

## Enabled by

- [Decorator Pattern](https://banes-lab.com/records/architecture/decorator-pattern.md)

## Linked from

- [Structural Patterns](https://banes-lab.com/ontology/principles/architecture-category-structural-patterns.md)