diff --git a/lib/nexus/cli.ex b/lib/nexus/cli.ex
index 7266b79..6ac7d43 100644
--- a/lib/nexus/cli.ex
+++ b/lib/nexus/cli.ex
@@ -8,11 +8,13 @@ defmodule Nexus.CLI do
 
   @callback version :: String.t()
   @callback banner :: String.t()
+  @callback handle_input(cmd) :: :ok
+            when cmd: atom
   @callback handle_input(cmd, args) :: :ok
             when cmd: atom,
-                 args: list
+                 args: Nexus.Command.Input.t()
 
-  @optional_callbacks banner: 0, handle_input: 2
+  @optional_callbacks banner: 0, handle_input: 2, handle_input: 1
 
   @type t :: map
 
diff --git a/lib/nexus/command_dispatcher.ex b/lib/nexus/command_dispatcher.ex
index 461bcf1..be740d1 100644
--- a/lib/nexus/command_dispatcher.ex
+++ b/lib/nexus/command_dispatcher.ex
@@ -8,7 +8,14 @@ defmodule Nexus.CommandDispatcher do
 
   def dispatch!(%Command{} = spec, raw) do
     input = Parser.run!(raw, spec)
-    spec.module.handle_input(spec.name, input)
+
+    case {spec.type, input.value} do
+      {:null, nil} ->
+        :ok = spec.module.handle_input(spec.name)
+
+      _ ->
+        :ok = spec.module.handle_input(spec.name, input)
+    end
   end
 
   def dispatch!(module, raw) when is_binary(raw) do