Umbraco Extension Registry

This teaches Claude how to work with Umbraco's Extension Registry, the core system that manages all backoffice UI elements. It's focused on runtime operations like registering, excluding, and replacing extensions using umbExtensionsRegistry. The skill emphasizes fetching fresh docs before implementing and includes solid examples for common tasks like hiding default dashboards, replacing built-in actions, and dynamic registration from server data. Most useful when you need to customize the Umbraco backoffice beyond static manifests, especially for conditional features or when you want to modify what Umbraco ships by default. The workflow is straightforward: fetch docs, ask clarifying questions, generate code, explain what changed.

skills.sh installs: 403
GitHub stars: 27
last updated: Aug 21, 2026

View on GitHub

Install

$ npx -y skills add umbraco/umbraco-cms-backoffice-skills --skill umbraco-extension-registry --agent claude-code

Installs into .claude/skills of the current project.

Files

Umbraco Extension Registry

What is it?

The Extension Registry is the core system managing all Umbraco backoffice UI elements - almost any UI in the Backoffice is an extension managed by the Extension Registry. The registry allows developers to dynamically add, remove, or modify extensions at runtime using umbExtensionsRegistry. Developers have the same possibilities as Umbraco HQ, meaning you can change almost everything that is by default present in Umbraco.