Commands can throw exceptions

src/main/java/com/mojang/brigadier/Command.java

@@ -1,10 +1,11 @@
 package com.mojang.brigadier;
 
 import com.mojang.brigadier.context.CommandContext;
+import com.mojang.brigadier.exceptions.CommandException;
 
 @FunctionalInterface
 public interface Command<S> {
     int SINGLE_SUCCESS = 1;
 
-    int run(CommandContext<S> context);
+    int run(CommandContext<S> context) throws CommandException;
 }