Feat: Grasping Limbs
Your eidolon grabs enemies. Choose one of the eidolon's unarmed attacks with the grapple trait. Your eidolon gains the Grab action on that unarmed attack.
Pathfinder 2e Database
Your eidolon grabs enemies. Choose one of the eidolon's unarmed attacks with the grapple trait. Your eidolon gains the Grab action on that unarmed attack.