minecraft-bedrock-json-schemas/source/behavior/entities/format/behaviors/peek.json

{
  "$id": "blockception.minecraft.behavior.entities.minecraft.behavior.peek",
  "description": "Allows the mob to peek out. This is what the shulker uses to look out of its shell.",
  "type": "object",
  "title": "Peek",
  "additionalProperties": false,
  "required": [],
  "properties": {
    "priority": {
      "$ref": "./types/priority.json"
    }
  }
}