diff --git a/src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/command/execution/checks/HandlerCheck.java b/src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/command/execution/checks/HandlerCheck.java
new file mode 100644
index 0000000..cabe7f3
--- /dev/null
+++ b/src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/command/execution/checks/HandlerCheck.java
@@ -0,0 +1,10 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.command.execution.checks;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.Request;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.response.Response;
+import java.util.Optional;
+
+@FunctionalInterface
+public interface HandlerCheck {
+    Optional<Response> check(Request request);
+}