How to make summoning weapon (summon creature)?

Im trying to make a summoning weapon and I want to make it so summoned creature will despawn after attacking once or after killing an enemy but I dont know how
I triend but all I ended up with is making it despaw all entities or attacked enemy despawn

If thats imposible than, Is it possible to make it so "Tamed Entity Died" line wont show up in the chat?