Codebase!

src/main/java/com/gmail/nossr50/skills/repair/RepairManager.java

@@ -62,6 +62,11 @@ public class RepairManager extends SkillManager {
         Player player = getPlayer();
         Repairable repairable = mcMMO.getRepairableManager().getRepairable(item.getType());
 
+        if (item.getItemMeta().isUnbreakable()) {
+            player.sendMessage(LocaleLoader.getString("Anvil.Unbreakable"));
+            return;
+        }
+        
         // Permissions checks on material and item types
         if (!Permissions.repairMaterialType(player, repairable.getRepairMaterialType())) {
             player.sendMessage(LocaleLoader.getString("mcMMO.NoPermission"));

src/main/java/com/gmail/nossr50/skills/salvage/SalvageManager.java

@@ -60,6 +60,11 @@ public class SalvageManager extends SkillManager {
 
         Salvageable salvageable = mcMMO.getSalvageableManager().getSalvageable(item.getType());
 
+        if (item.getItemMeta().isUnbreakable()) {
+            player.sendMessage(LocaleLoader.getString("Anvil.Unbreakable"));
+            return;
+        }
+        
         // Permissions checks on material and item types
         if (!Permissions.salvageItemType(player, salvageable.getSalvageItemType())) {
             player.sendMessage(LocaleLoader.getString("mcMMO.NoPermission"));

src/main/resources/locale/locale_en_US.properties

@@ -283,6 +283,9 @@ Salvage.Listener.Anvil=[[DARK_RED]]You have placed a Salvage anvil, use this to
 Salvage.Listener=Salvage:
 Salvage.SkillName=SALVAGE
 
+#Anvil (Shared between SALVAGE and REPAIR)
+Anvil.Unbreakable=This item is unbreakable!
+
 #SWORDS
 Swords.Ability.Lower=[[GRAY]]**YOU LOWER YOUR SWORD**
 Swords.Ability.Ready=[[GREEN]]**YOU READY YOUR SWORD**