# Closed Core

> A core that cannot be extended without modifying its own source, so every addition edits the core.

Record: `lex:closed-core`
Kind: anti-pattern
Layer: [Extensibility Core](https://banes-lab.com/records/layer/extensibility-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lex-closed-core

## category

- [Plugin / Extensibility / IoC](https://banes-lab.com/records/lex-category/plugin-extensibility-ioc.md)

## referenced-by

- [Extension Points](https://banes-lab.com/records/arch/extension-points.md)