Umbraco Backoffice Skills Marketplace

Experimental Beta: This project is an exploration of what’s possible with Skills for Umbraco. It’s evolving as we learn what works best.

A Claude Code plugin marketplace with 67 skills for Umbraco backoffice customization and testing.

Quick Start

Add the marketplace:

/plugin marketplace add umbraco/Umbraco-CMS-Backoffice-Skills

Install the plugins:

# Backoffice extension skills (59 skills)
/plugin install umbraco-cms-backoffice-skills@umbraco-backoffice-marketplace

# Testing skills (8 skills) - optional but recommended
/plugin install umbraco-cms-backoffice-testing-skills@umbraco-backoffice-marketplace

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⚠️ Match the skills to your Umbraco major

These skills are versioned to a single Umbraco major (tree data sources, auth, OpenAPI registration and more differ between majors, so loading the wrong line produces confidently-incorrect code). Each major gets its own line, following one rule:

• The default main branch always targets the latest supported major.
• Older majors live on a vN/main branch (e.g. v17/main).

So pick your install by your site’s major:

Currently main targets Umbraco 18, and v17/main is available for Umbraco 17. When a new major ships, main moves to it and the previous major moves to its own vN/main.

For the Vercel Skills CLI (Cursor/Copilot/Windsurf), point the repo URL at the matching branch — main for the latest major, or .../tree/vN/main/... for an older one.

Not sure which major your site is? Check the Umbraco.Cms version in your project’s .csproj, or the @umbraco-cms/backoffice version in your Client/package.json.

Automatic safety net: the umbraco-version-guard skill runs as a preflight inside the entry skills (umbraco-quickstart, umbraco-backoffice, umbraco-extension-template). It derives the major these skills target from the plugin itself, detects your site’s major, and stops with a warning if they don’t match — so a mismatch can’t silently produce wrong code, and the check stays correct as new majors ship. Run it directly any time with /umbraco-version-guard.

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Install for Other Editors (Cursor, GitHub Copilot, Windsurf, and more)

These skills use the open SKILL.md format, which is now supported natively by multiple AI coding tools. You can install them into any supported editor using the Vercel Skills CLI.