It took me a while to figure out (especially JSON, jesus), so I figured I should post it somewhere so people don't have to break their heads with JSON syntax.

You could make it so it replaces some placeholders in chat with it or something:

Code (Skript):

1. import:
2.     net.md_5.bungee.api.chat.BaseComponent
3.     net.md_5.bungee.api.chat.TextComponent
4.     net.md_5.bungee.api.chat.TranslatableComponent
5.     org.bukkit.Material
6.    
7. on rightclick:
8.     if name of tool of player is not set:
9.         set {_material} to Material.matchMaterial("%vanilla name of tool of player%") #get raw material from item
10.         set {_rawName} to "%vanilla name of tool of player%"
11.         replace every ":" in {_rawName} with "."
12.         if {_material}.isBlock() is true: #if item is block, add "block." prefix, otherwise - "item."
13.             set {_rawName} to "block.%{_rawName}%"
14.         else:
15.             set {_rawName} to "item.%{_rawName}%"
16. #translatable name would look like this: "block.minecraft.stone"
17.            
18.         set {_c} to a new text component "<dark gray>[<reset>"
19.         {_c}.addExtra(new TranslatableComponent({_rawName})) #adding translatabe component to text component of Skellett
20.         {_c}.addExtra(new TextComponent(" <gray>x%number of tool of player%<dark gray>]"))
21.     else: #if item has custom name
22.         set {_c} to a new text component "<dark gray>[<reset>%name of tool of player% <gray>x%number of tool of player%<dark gray>]<reset>"
23.  
24.     if item-nbt of tool of player is set: #if item has any nbt data, requires NBeeT
25.         add hover event with action SHOW_ITEM with text "{""id"":""%vanilla name of tool of player%"",""Count"":1,""tag"":%item-nbt of tool of player%}" to text component {_c}
26.     else: #if no nbt data
27.         add hover event with action SHOW_ITEM with text "{""id"":""%vanilla name of tool of player%"",""Count"":1}" to text component {_c}
28.  
29.     message text components {_c} to player

Requires Skellett and skript-mirror

Works on 1.13.2, probably needs tweaks for previous versions