diff --git a/SpigotCore_14/src/de/steamwar/command/Argument.java b/SpigotCore_14/src/de/steamwar/command/Argument.java
new file mode 100644
index 0000000..f94200a
--- /dev/null
+++ b/SpigotCore_14/src/de/steamwar/command/Argument.java
@@ -0,0 +1,53 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ * /
+ */
+
+package de.steamwar.command;
+
+import org.bukkit.command.CommandSender;
+
+import java.util.List;
+import java.util.function.BiPredicate;
+
+public interface Argument<T> {
+
+    T parse(String arg) throws InvalidArgumentException;
+    void checkConstraints(CommandSender sender, T argument) throws InvalidArgumentException;
+
+    List<String> tabComplete(CommandSender sender, String arg) throws InvalidArgumentException;
+    default BiPredicate<String, String> tabCompleteFilter() {
+        return String::startsWith;
+    }
+
+    abstract class IntArgument implements Argument<Integer> {
+        @Override
+        public Integer parse(String arg) {
+            return Integer.parseInt(arg);
+        }
+    }
+
+    abstract class DoubleArgument implements Argument<Double> {
+        @Override
+        public Double parse(String arg) {
+            return Double.parseDouble(arg);
+        }
+    }
+
+}
diff --git a/SpigotCore_14/src/de/steamwar/command/InvalidArgumentException.java b/SpigotCore_14/src/de/steamwar/command/InvalidArgumentException.java
new file mode 100644
index 0000000..8184b24
--- /dev/null
+++ b/SpigotCore_14/src/de/steamwar/command/InvalidArgumentException.java
@@ -0,0 +1,26 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ * /
+ */
+
+package de.steamwar.command;
+
+public class InvalidArgumentException extends Exception {
+
+}