Minecraft Wiki
Generic Mojang avatar.png For the uninitiated, an Add-On is basically a pack of files that lets you change how Minecraft's world works. Want 50ft chickens? You can have them! Want to create a pigman army to do your bidding and dress them all in frilly tutus? You can do that too, you weirdo! If you want more examples of what you can do with them, check out our dedicated Add-Ons page. They're pretty powerful things!
Michael Ott[1]

Add-ons are the first step towards bringing customization to all editions of Minecraft and are officially supported by Mojang/Minecraft. Currently, add-ons are only supported on Pocket Edition platforms, which includes also the Windows 10, Gear VR, Apple TV and Fire TV Editions. They currently allow players to transform the look of their worlds and change the behavior of mobs. The documentation provided on these pages is officially supported and endorsed. It was provided by the Minecraft development team in order to assist the community.[2]

To provide feedback on add-ons, please visit the official feedback forums.

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Since the early development of the computer version of Minecraft, there have been plans to implement an official way for developers to add and change content in the game. Plans for official game customization date back to July 5, 2010, with the Modding API planned after the release of Alpha 1.0.1_01.[3] It was then stated to be released in Beta 1.8.[4] The Modding API was then rebranded as the Plugin API[5][6], with the release originally stated to be planned for 1.3, then for 1.4, and then it was accidentally stated by Curse that it would be implemented in 1.5.[7][8]

At MineCon 2012, Mojang shared their vision for the future of the Plugin API.[9] The API was to be developed by the Bukkit team[10] and intended to simplify the modding[11][12][13] and downloading process,[14][15][16] although containing a slightly limited feature set.[17][18] After initially publishing a developer website (http://dev.minecraft.net) and GitHub page, these were both taken down within a year.

Developers on numerous occasions have mentioned that many changes made in the game's code were in preparation for the Plugin API, including Dinnerbone on July 29th 2014,[19] Grum at the "The Minecraft Team - Behind the Scenes" panel on July 5th, 2015[20] and Dinnerbone again on October 19th 2015 while working on the loot tables for 1.9.[21] A user replied "I think an official "we're working on it" would really help a lot"[22] to which Dinnerbone replied "We're working on it."[23]

On August 12, 2016, Searge tweeted: "There will be news about the API at Minecon [2016]. I'll talk about the things I'm working on and what our plans are. But no more details for now."[24] The next day it was confirmed by Grum to be for Pocket Edition[25] and at Minecon the plan and roadmap for the development of add-ons were outlined.