MCMinecraft Assets Explorer

{
  "parent": "minecraft:nether/get_wither_skull",
  "display": {
    "icon": {
      "item": "minecraft:nether_star"
    },
    "title": {
      "translate": "advancements.nether.summon_wither.title"
    },
    "description": {
      "translate": "advancements.nether.summon_wither.description"
    },
    "frame": "task",
    "show_toast": true,
    "announce_to_chat": true,
    "hidden": false
  },
  "criteria": {
    "summoned": {
      "trigger": "minecraft:summoned_entity",
      "conditions": {
        "entity": [
          {
            "condition": "minecraft:entity_properties",
            "predicate": {
              "type": "minecraft:wither"
            },
            "entity": "this"
          }
        ]
      }
    }
  },
  "requirements": [
    [
      "summoned"
    ]
  ]
}