2 agent markdown files indexed from netresearch/typo3-extension-upgrade-skill. Install any of them pinned to an exact hash with mdr add netresearch/typo3-extension-upgrade-skill/<name>.
netresearch/typo3-extension-upgrade-skill · skills/typo3-extension-upgrade/SKILL.md · Use when an extension has to work with a newer or the current TYPO3 LTS, when a version bump breaks compatibility or…