tried out different shit, didnt work

src/main/java/net/saltymc/eaa/EaaMod.java

@@ -1,19 +1,25 @@
 package net.saltymc.eaa;
 
-import net.fabricmc.api.ModInitializer;
+import com.mojang.brigadier.arguments.DoubleArgumentType;
 import net.saltymc.eaa.handler.commands.EchoCommand;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
-public class EaaMod implements ModInitializer {
+import net.fabricmc.api.ClientModInitializer;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+import net.fabricmc.fabric.api.client.command.v1.ClientCommandManager;
+
+import static net.fabricmc.fabric.api.client.command.v1.ClientCommandManager.literal;
+
+@Environment(EnvType.CLIENT)
+public final class EaaMod implements ClientModInitializer {
+	private static final Logger LOGGER = LogManager.getLogger();
 
 	@Override
-	public void onInitialize() {
+	public void onInitializeClient() {
-		// This code runs as soon as Minecraft is in a mod-load-ready state.
+		ClientCommandManager.DISPATCHER.register(literal("test_client_command_with_arg").then(
-		// However, some things (like resources) may still be uninitialized.
+				ClientCommandManager.argument("nachricht", DoubleArgumentType.doubleArg())).executes(EchoCommand::run));
-		// Proceed with mild caution.
-
-		System.out.println("EAA Mod initializing...");
-
-		new EchoCommand();
 
 	}
 }

src/main/java/net/saltymc/eaa/handler/commands/EaaModCommand.java

@@ -2,18 +2,12 @@ package net.saltymc.eaa.handler.commands;
 
 import com.mojang.brigadier.Command;
 import com.mojang.brigadier.builder.LiteralArgumentBuilder;
-
-import net.fabricmc.fabric.api.client.command.v1.ClientCommandManager;
 import net.fabricmc.fabric.api.client.command.v1.FabricClientCommandSource;
 
 public abstract class EaaModCommand implements Command<FabricClientCommandSource> {
 
-    public EaaModCommand() {
+    public LiteralArgumentBuilder<FabricClientCommandSource> register(){
-        this.register();
+        return this.getCommandSpecification().executes(this);
-    }
-
-    public void register(){
-        ClientCommandManager.DISPATCHER.register(getCommandSpecification().executes(this));
     }
 
     public abstract LiteralArgumentBuilder<FabricClientCommandSource> getCommandSpecification();

src/main/java/net/saltymc/eaa/handler/commands/EchoCommand.java

@@ -1,9 +1,10 @@
 package net.saltymc.eaa.handler.commands;
 
-import com.mojang.brigadier.arguments.StringArgumentType;
+
+import com.mojang.brigadier.Command;
+import com.mojang.brigadier.arguments.DoubleArgumentType;
 import com.mojang.brigadier.builder.LiteralArgumentBuilder;
 import com.mojang.brigadier.context.CommandContext;
-import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import net.fabricmc.fabric.api.client.command.v1.ClientCommandManager;
 import net.fabricmc.fabric.api.client.command.v1.FabricClientCommandSource;
 import net.minecraft.client.toast.SystemToast;
@@ -11,29 +12,34 @@ import net.minecraft.text.LiteralText;
 import net.minecraft.text.Text;
 import net.minecraft.util.Formatting;
 
-import static com.mojang.brigadier.arguments.StringArgumentType.getString;
+import static net.fabricmc.fabric.api.client.command.v1.ClientCommandManager.argument;
+import static net.fabricmc.fabric.api.client.command.v1.ClientCommandManager.literal;
 
-
+public class EchoCommand {
-public class EchoCommand extends EaaModCommand {
+    public static int run(CommandContext<FabricClientCommandSource> context) { // throws CommandSyntaxException
-    @Override
+        FabricClientCommandSource source = context.getSource();
-    public int run(CommandContext context) throws CommandSyntaxException {
-        FabricClientCommandSource source = (FabricClientCommandSource) (context.getSource());
 
         SystemToast.add(source.getClient().getToastManager(), SystemToast.Type.TUTORIAL_HINT, Text.of("ECHO"), Text.of(context.getInput()));
 
+        //String nachricht = getString(context,"nachricht");
+        double nachricht = DoubleArgumentType.getDouble(context, "nachricht");
+        System.out.println("nachricht is " + nachricht);
+
         source.sendFeedback(
                 new LiteralText("You said input: ")
                             .formatted(Formatting.RED)
-                            .append(new LiteralText(getString(context, "message"))
+                            .append(new LiteralText(nachricht + ""))
-                                    .formatted(Formatting.WHITE, Formatting.ITALIC)
-                                    )
                             );
-        return SINGLE_SUCCESS;
+        return 1;
+    }
+
+    public LiteralArgumentBuilder<FabricClientCommandSource> register() {
+        return this.getCommandSpecification().executes(context -> this.run(context));
     }
 
-    @Override
     public LiteralArgumentBuilder<FabricClientCommandSource> getCommandSpecification() {
-        return ClientCommandManager.literal("echo")
+        //return literal("echo").then(argument("nachricht", DoubleArgumentType.doubleArg()));
-                .then(ClientCommandManager.argument("message", StringArgumentType.greedyString()));
+        return literal("test_client_command_with_arg").then(
+                ClientCommandManager.argument("nachricht", DoubleArgumentType.doubleArg()));
     }
 }

src/main/resources/fabric.mod.json

@@ -19,7 +19,7 @@
 
   "environment": "*",
   "entrypoints": {
-    "main": [
+    "client": [
       "net.saltymc.eaa.EaaMod"
     ]
   },