command /iaskriptgetitem <text> [<number=1>]:trigger:set {%player%.item} to nullset {%player%.item} to customitem arg 1if {%player%.item} is null:message "Custom item %arg 1% not found"else:give player arg 2 of {%player%.item}message "Obtained custom item %arg 1%"
command /iaskriptiscustomitem:trigger:if player's tool is a customitem:message "it's a custom item"else:message "it's not a custom item"
command /emojitest:trigger:set {iconConfirm} to fontimage "twitteremojis:confirm"message "Good: %{iconConfirm}%"
If you think there is any missing method you need don't worry. I will add more features to the Skript API, you just have to be patient.