diff --git a/src/planner.cpp b/src/planner.cpp
index 5520c65..4fe0f8c 100644
--- a/src/planner.cpp
+++ b/src/planner.cpp
@@ -2,7 +2,6 @@
 #include "action.hpp"
 #include "global_world_state.hpp"
 #include "utils/godot_macros.h"
-#include <cassert>
 #include <cstdlib>
 #include <godot_cpp/templates/pair.hpp>
 #include <godot_cpp/variant/utility_functions.hpp>
diff --git a/src/planner.hpp b/src/planner.hpp
index 6fa4824..b197812 100644
--- a/src/planner.hpp
+++ b/src/planner.hpp
@@ -14,23 +14,6 @@ class CharacterActor;
 namespace goap {
 class GlobalWorldState;
 
-struct State {
-    static State new_move_to(Vector3 location);
-    static State new_animate(StringName animation);
-    static State new_activate(Node *node);
-    enum Type {
-        STATE_MOVE_TO,
-        STATE_ANIMATE,
-        STATE_ACTIVATE
-    };
-    State::Type type;
-    union {
-        Vector3 move_to;
-        StringName animate;
-        Node *activate;
-    };
-};
-
 class Goal : public Resource {
     GDCLASS(Goal, Resource);
     static void _bind_methods();
diff --git a/src/register_types.cpp b/src/register_types.cpp
index 701e673..8a05f53 100644
--- a/src/register_types.cpp
+++ b/src/register_types.cpp
@@ -1,13 +1,14 @@
 #include "register_types.h"
 #include "action.hpp"
-#include "character_data.hpp"
 #include "character_actor.hpp"
+#include "character_data.hpp"
 #include "enemy.hpp"
 #include "global_world_state.hpp"
 #include "health.hpp"
 #include "pellet_projectile.hpp"
 #include "planner.hpp"
 #include "projectile_pool.hpp"
+#include "state.hpp"
 #include "tunnels_game_mode.hpp"
 #include "tunnels_game_state.hpp"
 #include "tunnels_player.hpp"
@@ -57,6 +58,10 @@ void initialize_gdextension_types(ModuleInitializationLevel p_level)
 
     ClassDB::register_class<goap::Action>();
     ClassDB::register_class<goap::GlobalWorldState>();
+    ClassDB::register_abstract_class<goap::StateArgs>();
+    ClassDB::register_class<goap::MoveStateArgs>();
+    ClassDB::register_class<goap::AnimateStateArgs>();
+    ClassDB::register_class<goap::ActivateStateArgs>();
     ClassDB::register_class<goap::Goal>();
     ClassDB::register_class<goap::Planner>();
 }
diff --git a/src/state.cpp b/src/state.cpp
new file mode 100644
index 0000000..165c3e7
--- /dev/null
+++ b/src/state.cpp
@@ -0,0 +1,76 @@
+#include "state.hpp"
+#include "character_actor.hpp"
+#include "utils/godot_macros.h"
+
+namespace godot::goap {
+State::~State() {
+    if(unlikely(this->type == STATE_ANIMATE))
+        delete this->animate;
+}
+
+State State::new_move_to(Node3D *node) {
+    return {
+        .type = State::Type::STATE_MOVE_TO,
+        .move_to = node
+    };
+}
+
+State State::new_animate(StringName animation) {
+    return {
+        .type = State::Type::STATE_ANIMATE,
+        .animate = new StringName(animation)
+    };
+}
+
+State State::new_activate(Node *node) {
+    return {
+        .type = State::Type::STATE_ACTIVATE,
+        .activate = node
+    };
+}
+
+bool State::is_complete(CharacterActor *context) const {
+    switch(this->type) {
+    default:
+        return true;
+    case STATE_MOVE_TO:
+        return context->get_global_position().is_equal_approx(this->move_to->get_global_position());
+    case STATE_ANIMATE:
+        return false; // TODO: replace this with checks for animation completion
+    case STATE_ACTIVATE:
+        return false; // TODO: replace this with checks for object activation
+    }
+}
+
+void StateArgs::_bind_methods() {
+#define CLASSNAME StateArgs
+    GDPROPERTY(argument_property, Variant::STRING_NAME);
+}
+
+State StateArgs::construct(Node *context) const {
+    return { .type = State::STATE_TYPE_MAX };
+}
+
+void StateArgs::set_argument_property(StringName var) { this->argument_property = var; }
+StringName StateArgs::get_argument_property() const { return this->argument_property; }
+
+void MoveStateArgs::_bind_methods() {}
+
+State MoveStateArgs::construct(Node *context) const {
+    Node3D *node = Object::cast_to<Node3D>(context->call("get_" + this->argument_property));
+    return State::new_move_to(node);
+}
+
+void AnimateStateArgs::_bind_methods() {}
+
+State AnimateStateArgs::construct(Node *context) const {
+    return State::new_animate(context->call("get_" + this->argument_property));
+}
+
+void ActivateStateArgs::_bind_methods() {}
+
+State ActivateStateArgs::construct(Node *context) const {
+    Node *node = Object::cast_to<Node>(context->call("get_" + this->argument_property));
+    return State::new_activate(node);
+}
+}
diff --git a/src/state.hpp b/src/state.hpp
new file mode 100644
index 0000000..8a7e528
--- /dev/null
+++ b/src/state.hpp
@@ -0,0 +1,65 @@
+#ifndef GOAP_STATE_HPP
+#define GOAP_STATE_HPP
+
+#include <godot_cpp/variant/vector3.hpp>
+#include <godot_cpp/variant/string_name.hpp>
+#include <godot_cpp/classes/node.hpp>
+#include <godot_cpp/classes/node3d.hpp>
+#include <godot_cpp/classes/resource.hpp>
+
+namespace godot { class CharacterActor; }
+namespace godot::goap {
+struct State {
+    ~State();
+    static State new_move_to(Node3D *location);
+    static State new_animate(StringName animation);
+    static State new_activate(Node *node);
+
+    bool is_complete(CharacterActor *context) const;
+
+    enum Type {
+        STATE_MOVE_TO,
+        STATE_ANIMATE,
+        STATE_ACTIVATE,
+        STATE_TYPE_MAX,
+    };
+    State::Type type{STATE_TYPE_MAX};
+    union {
+        Node3D* move_to;
+        StringName *animate;
+        Node *activate;
+    };
+};
+
+class StateArgs : public Resource {
+    GDCLASS(StateArgs, Resource);
+    static void _bind_methods();
+public:
+    virtual State construct(Node *context) const;
+    void set_argument_property(StringName name);
+    StringName get_argument_property() const;
+    StringName argument_property;
+};
+
+class MoveStateArgs : public StateArgs {
+    GDCLASS(MoveStateArgs, StateArgs);
+    static void _bind_methods();
+    virtual State construct(Node *context) const override;
+};
+
+class AnimateStateArgs : public StateArgs {
+    GDCLASS(AnimateStateArgs, StateArgs);
+    static void _bind_methods();
+public:
+    virtual State construct(Node *context) const override;
+};
+
+class ActivateStateArgs : public StateArgs {
+    GDCLASS(ActivateStateArgs, StateArgs);
+    static void _bind_methods();
+public:
+    virtual State construct(Node *context) const override;
+};
+};
+
+#endif // !GOAP_STATE_HPP