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Java Edition 17w13a

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Minecraft 17w13a

Java Edition



Release date

March 30, 2017

Snapshot for



Client (.json)

Protocol version


Data version


17w13a[1] is the second snapshot released for Java Edition 1.12.



Knowledge books
  • A green-colored book.
  • Currently obtainable only with the /give @p knowledge_book command.
  • A Knowledge Book with a Recipes NBT tag, which contains a list of item IDs, will be consumed and unlock the specified items' recipes for any player that uses it.
    • Especially useful when /gamerule doLimitedCrafting is set to true.
Spawn eggs
  • Parrot (new mob): Green with red dots.


  • Tamable with cookies
  • Fly around, but sit when "tired".
  • Follow and crowd around nearby mobs.
  • Imitates sounds of other mobs.
  • Right-click tamed parrots to place them on your shoulder.
    • Will let go if the player jumps.
    • Can fly with players during elytra flight.
  • Have 6♥♥♥ health.
  • Come in red, blue, green and cyan.


  • doLimitedCrafting
    • Off by default.
    • Enabling will only allow players to craft recipes they have unlocked.

Command format[edit]

/recipe <give|take> [player] <name|*>

  • Can unlock, or lock, the given recipes for the given player.
  • If * is specified, it will lock or unlock all recipes for the player.

/advancement <grant|revoke|test> <player> <advancement> [criterion]

  • Can grant, test or revoke advancements, and particular advancement criteria, for a given player.


  • Replaces achievements.
  • Can be customized via JSON files.
  • Tab-based UI.
    • Currently one tab (Minecraft) although more will be supported in the future.
    • Different background per tab, single texture on repeat for now.
    • Data-driven UI, including positioning and layout.
  • CTRL + B toggles a text-to-speech engine that automatically reads player chat messages, including the name.
  • The Narrator will not read commands or command outputs, nor will it read messages produced with /me.
NBT tags
  • ShoulderEntityLeft / ShoulderEntityRight: Contains entity data about an entity on the left and right shoulders of the player.
  • seenCredits: Changes to 1 if the player leaves the End through the portal.
  • recipeBook: A string containing a list of recipes, formatted as JSON, that the player has seen.
  • Recipes: A list of crafting recipes to unlock for the player that right-clicks while holding a Knowledge Book.
    • If this is not specified, the Knowledge Book will not be consumed.
Recipe books
  • Catalogs recipes that are unlocked when the criteria are met.
  • When a recipe is clicked, it will appear in the crafting grid, and can be crafted if materials are available.
  • recipes folder added with all item recipes as .json files.



Comparison of the terracotta texture changes.
Glazed Terracotta
  • Textured changed for cyan, magenta, orange, and white glazed terracotta, to remove unintentional and potentially offensive imagery.[2]
  • Now display their name when hovering over them.
Enchantment Tables
  • Now display their name when hovering over them.


Fishing rods
  • Changed the sound of bobbers being thrown.


  • Removed and replaced by advancements.
  • Closing the crafting interface with items inside will no longer drop the items in front of you, but will send them instead to the inventory.
Java version
  • This is the first snapshot to use, and thus require, Java 8.[3]
Moving backwards
  • The player's body now entirely faces to the front, when moving backwards.[4][5]
    • Prior to this snapshot, moving backwards would cause the player model to rotate one side, making it look like the player was strafing backwards somewhat.


2 issues fixed
From the previous development version
  • MC-113377 – New block Swastika
  • MC-113844 – White Glazed Terracotta symbol (looks like the symbol of the Hungarian Nazi party)


Video made by slicedlime:


  • 17w13a was previously removed from the launcher for some time, but was added back in September 2018.