diff --git a/src/main/java/carpet/script/CarpetScriptHost.java b/src/main/java/carpet/script/CarpetScriptHost.java
index d0b3fec9..ff52e50d 100644
--- a/src/main/java/carpet/script/CarpetScriptHost.java
+++ b/src/main/java/carpet/script/CarpetScriptHost.java
@@ -35,6 +35,7 @@ import org.apache.commons.lang3.tuple.Pair;
 import java.math.BigInteger;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -226,23 +227,58 @@ public class CarpetScriptHost extends ScriptHost
         return true;
     }
 
+    static class ListComparator<T extends Comparable<T>> implements Comparator<Pair<List<T>,?>>
+    {
+        @Override
+        public int compare(Pair<List<T>,?> p1, Pair<List<T>,?> p2) {
+            List<T> o1 = p1.getKey();
+            List<T> o2 = p2.getKey();
+            for (int i = 0; i < Math.min(o1.size(), o2.size()); i++) {
+                int c = o1.get(i).compareTo(o2.get(i));
+                if (c != 0) {
+                    return c;
+                }
+            }
+            return Integer.compare(o1.size(), o2.size());
+        }
+    }
+
     public LiteralArgumentBuilder<ServerCommandSource> readCommands() throws CommandSyntaxException
     {
         Value commands = appConfig.get(StringValue.of("commands"));
+
         if (commands == null) return null;
         if (!(commands instanceof MapValue))
             throw CommandArgument.error("'commands' element in config should be a map");
         List<Pair<List<CommandToken>,FunctionArgument<Value>>> commandEntries = new ArrayList<>();
+
         for (Map.Entry<Value, Value> commandsData : ((MapValue)commands).getMap().entrySet().stream().sorted(Map.Entry.comparingByKey()).collect(Collectors.toList()))
         {
             List<CommandToken> elements = CommandToken.parseSpec(commandsData.getKey().getString(), this);
             FunctionArgument<Value> funSpec = FunctionArgument.fromCommandSpec(this, commandsData.getValue());
             commandEntries.add(Pair.of(elements, funSpec));
         }
-        // validate
-        // ...
-        //
-
+        commandEntries.sort(new ListComparator<>());
+        if (!appConfig.getOrDefault(StringValue.of("allow_command_conflicts"), Value.FALSE).getBoolean())
+        {
+            for (int i = 0; i < commandEntries.size()-1; i++)
+            {
+                List<CommandToken> first = commandEntries.get(i).getKey();
+                List<CommandToken> other = commandEntries.get(i+1).getKey();
+                int checkSize = Math.min(first.size(), other.size());
+                for (int t = 0; t < checkSize; t++)
+                {
+                    CommandToken tik = first.get(t);
+                    CommandToken tok = other.get(t);
+                    if (tik.isArgument && tok.isArgument && !tik.surface.equals(tok.surface))
+                        throw CommandArgument.error("Conflicting commands: \n"+
+                                " - [" +first.stream().map(tt -> tt.surface).collect(Collectors.joining(" ")) + "] at "+tik.surface+"\n"+
+                                " - [" +other.stream().map(tt -> tt.surface).collect(Collectors.joining(" ")) + "] at "+tok.surface+"\n");
+                    if (!tik.equals(tok))
+                        break;
+                }
+            }
+        }
         return this.getNewCommandTree(commandEntries);
     }
 
diff --git a/src/main/java/carpet/script/CarpetScriptServer.java b/src/main/java/carpet/script/CarpetScriptServer.java
index 61458ab1..58351dd9 100644
--- a/src/main/java/carpet/script/CarpetScriptServer.java
+++ b/src/main/java/carpet/script/CarpetScriptServer.java
@@ -303,7 +303,7 @@ public class CarpetScriptServer
 
         for (String function : host.globaFunctionNames(host.main, s ->  !s.startsWith("_")).sorted().collect(Collectors.toList()))
         {
-            if (host.appConfig.containsKey(StringValue.of("legacy_command_type_support"))) // temporary stuff for testing
+            if (host.appConfig.getOrDefault(StringValue.of("legacy_command_type_support"), Value.FALSE).getBoolean())
             {
                 try
                 {
diff --git a/src/main/java/carpet/script/command/CommandToken.java b/src/main/java/carpet/script/command/CommandToken.java
index cc3606ae..b76a605b 100644
--- a/src/main/java/carpet/script/command/CommandToken.java
+++ b/src/main/java/carpet/script/command/CommandToken.java
@@ -10,17 +10,20 @@ import net.minecraft.server.command.ServerCommandSource;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 
 import static net.minecraft.server.command.CommandManager.literal;
 
-public class CommandToken
+public class CommandToken implements Comparable<CommandToken>
 {
     public String surface;
     public boolean isArgument;
+    public CommandArgument type;
 
     private CommandToken(String surface, CommandArgument type )
     {
         this.surface = surface;
+        this.type = type;
         isArgument = type != null;
     }
 
@@ -65,4 +68,28 @@ public class CommandToken
         return literal(surface);
 
     }
+
+    @Override
+    public boolean equals(Object o)
+    {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        CommandToken that = (CommandToken) o;
+        return surface.equals(that.surface) &&
+                Objects.equals(type, that.type);
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return Objects.hash(surface, type);
+    }
+
+    @Override
+    public int compareTo(CommandToken o)
+    {
+        if (isArgument && !o.isArgument) return 1;
+        if (!isArgument && o.isArgument) return -1;
+        return surface.compareTo(o.surface);
+    }
 }