Java Edition 17w13a

17w13a is the second snapshot released for 1.12.

Items

 * Knowledge Book
 * A green-colored book
 * Currently obtainable only with the command.
 * A Knowledge Book with a  NBT tag, which contains a list of item IDs, will be consumed and unlock the specified items' recipes for any player that  it
 * Especially useful when is set to true


 * Spawn eggs
 * Parrot (new mob): Green with red dots.

Mobs

 * Parrots
 * 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 health.
 * Come in red, blue, green and cyan.

Gameplay

 * Gamerules
 * Off by default
 * Enabling will only allow players to craft recipes they have unlocked
 * Enabling will only allow players to craft recipes they have unlocked

Command format

 * Can unlock, or lock, the given recipes for the given player
 * If  is specified, it will lock or unlock all recipes for the player
 * Can grant, test or revoke advancements, and particular advancement criteria, for a given player

General

 * Advancements
 * 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


 * Narrator
 * + 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.


 * NBT tags
 * / : Contains entity data about an entity on the left and right shoulders of the player.
 * : Changes to 1 if the player leaves the End through the portal.
 * : A string containing a list of recipes, formatted as JSON, that the player has seen.
 * : 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 book
 * 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
 * folder added with all item recipes as  files.

Blocks



 * Glazed Terracotta
 * Textured changed for cyan, magenta, orange, and white glazed terracotta, to remove unintentional and potentially offensive imagery.


 * Beacons
 * Now display their name when hovering over them


 * Enchantment Table
 * Now display their name when hovering over them

General

 * Achievements
 * Removed and replaced by advancements


 * Crafting
 * 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.


 * Moving backwards
 * The player's body now entirely faces to the front, when moving backwards.
 * 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.

Reupload
17w13a was reuploaded on March 30, 2017 to fix a crash issue on macOS.

Video
Video made by slicedlime: