Feat: Miniaturize
Your eidolon can shrink even further. When using Shrink Down, your eidolon can reduce their size to Tiny. When Tiny, their reach is 0 feet.
Pathfinder 2e Database
Your eidolon can shrink even further. When using Shrink Down, your eidolon can reduce their size to Tiny. When Tiny, their reach is 0 feet.