Umbraco Version Guard

What this skill does

The Umbraco backoffice API changes between majors (tree data sources, auth, OpenAPI registration, and more). These skills target one specific major. Applying them to a site on a different major produces confidently-wrong code.

This skill is a preflight check: it derives the target major from the plugin itself (so it never goes stale as new majors ship), detects the target site's major deterministically, compares them, and STOPS with the correct install command on a mismatch. Nothing here hardcodes a specific major number — both sides are computed.

Step 1 — Determine the major these skills target

The plugin's own version is the source of truth, and it bumps every major at release. Read it and take the leading number: