config/sublime/Packages/LaTeX/Item[description].sublime-snippet

<snippet>
    <content><![CDATA[\\item[${1:description}] ${0:item}]]></content>
    <tabTrigger>itd</tabTrigger>
    <scope>text.tex.latex meta.function.environment.list</scope>
    <description>\item[description]</description>
</snippet>