minecraft-crawler/patchouli_books/vrcrawler/advancements/grant_book_on_first_join.json

{
  "criteria": {
    "tick": {
      "trigger": "minecraft:tick"
    }
  },
  "rewards": {
    "loot": [
      "vrcrawler:grant_book_on_first_join"
    ]
  }
}