Eu estava pesquisando o Compêndio de Aconselhamento sobre Sage quando percebi isso:

When you make a Strength (Athletics) check to grapple or shove someone, are you making an attack roll? Again, the answer is no. That check is an ability check, so game effects tied to attack rolls don’t apply to it. Going back to an earlier question, the hex spell could be used to diminish a grappler’s effectiveness. And if the grappler’s target is under the effect of the Dodge action, that action doesn’t inhibit the grapple, since Dodge doesn’t affect ability checks. I had always played that the 2nd Level Invisibility spell would end on a grapple, since it counts as an attack, but this seemed to suggest otherwise.

Eu pesquisei isso um pouco e descobri um post de Jeremy Crawford no Sage Advice, que parecia sugerir que era de fato uma jogada de ataque.

Grappling/shoving an enemy does end the sanctuary spell on you, since you have made an attack.

Meu melhor palpite é que você deve tomar a ação de ataque para executar uma checagem de habilidade, já que o PHB é chamado de "ataque corpo-a-corpo especial", embora isso não faça muito sentido.

...you can use the Attack action to make a special melee attack, a grapple.... ( PHB p.195:)

Estas duas respostas do Sage Advice contradizem umas as outras? E a invisibilidade deve terminar quando uma garra é tentada?

A descrição de invisibility é mostrada abaixo.

A creature you touch becomes Invisible until the spell ends. Anything the target is wearing or carrying is Invisible as long as it is on the target's person. The spell ends for a target that attacks or casts a spell.