AutoSwap

A client-side mod that automates inventory management and equipment swapping during
gameplay. It detects durability loss, empty item stacks, and block-breaking actions to
equip the correct items from your inventory automatically.

Client-side only (no server installation required). Fully compatible with singleplayer.

Features:

• Smart Tool Selection: Switches to the most efficient tool the moment you start
  mining a block, and won't replace a tool that's already the right type.
• Auto Weapon on Attack: Optionally draws your best sword from your
  inventory the instant you start hitting a mob — the combat counterpart of tool
  selection. Leave it off and AutoSwap simply never swaps off your weapon while a mob
  is in your crosshair.
• Gear Replacement: Automatically equips a matching tool, weapon, or armor piece
  from your inventory when the currently equipped one breaks.
• Offhand Replenishment: Keeps your off-hand stocked — when the held item is used
  up, AutoSwap refills it from a list you control. Add a Totem of Undying, shield, or
  any item through the built-in creative-style item picker (or by item id).
• Stack Refills: Automatically refills the active hotbar slot with identical blocks
  or torches when the current stack is depleted.
• Double-Jump Elytra: Equips an elytra from your inventory instantly upon performing
  a double jump, and swaps your chestplate back when you land.
• Restore After Auto-Tool: Puts the item you were holding back in
  your hand once you stop mining.

All features are completely modular. Each function can be enabled or disabled
individually through the redesigned in-game settings screen, the configuration file, or
via dedicated keybinds bindable under Controls → AutoSwap.

Translated into 10 languages — English and Russian are complete; other locales are
in progress.

Please report any bugs, errors, or feature suggestions on Discord: https://discord.gg/4XUPywnEyE