# Runtime Extensibility

> The degree to which new capability can be added to a running system through extension points, without modifying its core.

Record: `architecture:runtime-extensibility`
Kind: quality-attribute
Layer: [Extensibility Core](https://banes-lab.com/records/layer/extensibility-core.md)
Severity: contextual
Scope: runtime, plugin, system
Canonical: https://banes-lab.com/ontology#architecture-runtime-extensibility

Listed in [Architecture principles](https://banes-lab.com/api/records/architecture.md), after [Dynamic Dispatch](https://banes-lab.com/records/architecture/dynamic-dispatch.md) and before [Causality](https://banes-lab.com/records/architecture/causality.md).

## Repair

- Refactored by: Add Extension Point, Add Plugin Interface
- Detected by: repeated core changes for variants
- Violated by: modifying core for every extension
- Measured by: extension/core-change ratio
- Enforced by: extension conformance tests

## Requires

- [Extension Points](https://banes-lab.com/records/architecture/extension-points.md)
- [Stable Interfaces](https://banes-lab.com/records/architecture/stable-interfaces.md)

## Reinforces

- [Plugin Architecture](https://banes-lab.com/records/architecture/plugin-architecture.md)
- [Open/Closed Principle (OCP)](https://banes-lab.com/records/architecture/open-closed.md)

## Enables

- [Capability Addition without Core Modification](https://banes-lab.com/records/lexicon/capability-addition-without-core-modification.md)

## Conflicts with

- [Closed Static Core](https://banes-lab.com/records/lexicon/closed-static-core.md)

## In tension with

- [Predictability](https://banes-lab.com/records/architecture/predictability.md)
- [Security](https://banes-lab.com/records/lexicon/security.md)

## Tensions

- [Runtime Extensibility / Predictability](https://banes-lab.com/records/tension/predictability-runtime-extensibility.md)
- [Runtime Extensibility / Security](https://banes-lab.com/records/tension/runtime-extensibility-security.md)

## Contracts

- [Runtime Extensibility](https://banes-lab.com/records/algorithms/runtime-extensibility.md)

## Severity

- [contextual](https://banes-lab.com/records/vocabulary/severity-contextual.md)

## Category

- [Runtime Discovery / Dynamic Binding](https://banes-lab.com/records/architecture-category/runtime-discovery-dynamic-binding.md)

## Reinforced by

- [Runtime Discovery](https://banes-lab.com/records/architecture/runtime-discovery.md)
- [Dynamic Binding](https://banes-lab.com/records/architecture/dynamic-binding.md)
- [Runtime Code Generation](https://banes-lab.com/records/architecture/runtime-code-generation.md)
- [Prototype Pattern](https://banes-lab.com/records/architecture/prototype-pattern.md)
- [Feature Toggle](https://banes-lab.com/records/architecture/feature-toggle.md)

## Linked from

- [Runtime Discovery / Dynamic Binding](https://banes-lab.com/ontology/principles/architecture-category-runtime-discovery-dynamic-binding.md)
- [Contracts / Interfaces / Compatibility](https://banes-lab.com/ontology/principles/architecture-category-contracts-interfaces-compatibility.md)
- [Correctness / Determinism / Verification](https://banes-lab.com/ontology/principles/architecture-category-correctness-determinism-verification.md)
- [SOLID / Object-Oriented Design](https://banes-lab.com/ontology/principles/architecture-category-solid-object-oriented-design.md)
- [Metaprogramming / Language-Oriented Architecture](https://banes-lab.com/ontology/principles/architecture-category-metaprogramming-language-oriented-architecture.md)
- [Creational Patterns](https://banes-lab.com/ontology/principles/architecture-category-creational-patterns.md)
- [Plugin / Extensibility / IoC](https://banes-lab.com/ontology/principles/architecture-category-plugin-extensibility-ioc.md)
- [Quality Attributes](https://banes-lab.com/ontology/lexicon/lexicon-category-quality-attributes.md)
- [Runtime Discovery / Dynamic Binding](https://banes-lab.com/ontology/lexicon/lexicon-category-runtime-discovery-dynamic-binding.md)
- [Architecture relationships](https://banes-lab.com/ontology/algorithms/algorithms-domain-arch-relationships.md)
- [Severity levels](https://banes-lab.com/ontology/schema/the-vocabulary-severity.md)
- [The resolutions](https://banes-lab.com/ontology/schema/the-resolutions.md)