diff --git a/addons/behaviour_toolkit/behaviour_tree/bt_composite.gd b/addons/behaviour_toolkit/behaviour_tree/bt_composite.gd
index 7d9cb40..e598abf 100644
--- a/addons/behaviour_toolkit/behaviour_tree/bt_composite.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/bt_composite.gd
@@ -1,6 +1,25 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTComposite.svg")
 class_name BTComposite extends BTBehaviour
 
 
 ## The leaves under the composite node.
 @onready var leaves: Array = get_children()
+
+
+func _get_configuration_warnings() -> PackedStringArray:
+	var warnings: Array = []
+	
+	var parent = get_parent()
+	var children = get_children()
+
+	if not parent is BTComposite and not parent is BTRoot and not parent is BTDecorator:
+		warnings.append("BTComposite node must be a child of BTComposite or BTRoot node.")
+	
+	if children.size() == 0:
+		warnings.append("BTComposite node must have at least one child.")
+	
+	if children.size() == 1:
+		warnings.append("BTComposite node should have more than one child.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/bt_decorator.gd b/addons/behaviour_toolkit/behaviour_tree/bt_decorator.gd
index e2a0d69..7e8f109 100644
--- a/addons/behaviour_toolkit/behaviour_tree/bt_decorator.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/bt_decorator.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTDecorator.svg")
 class_name BTDecorator extends BTBehaviour
 
@@ -7,7 +8,26 @@ class_name BTDecorator extends BTBehaviour
 
 
 func _get_leaf() -> BTBehaviour:
-    if get_child_count() == 0:
-        return null
-    
-    return get_child(0)
+	if get_child_count() == 0:
+		return null
+	
+	return get_child(0)
+
+
+func _get_configuration_warnings() -> PackedStringArray:
+	var warnings: Array = []
+	
+	var parent = get_parent()
+	var children = get_children()
+
+	if not parent is BTComposite and not parent is BTRoot:
+		warnings.append("Decorator node should be a child of a composite node or the root node.")
+	
+	if children.size() == 0:
+		warnings.append("Decorator node should have a child.")
+	elif children.size() > 1:
+		warnings.append("Decorator node should have only one child.")
+	elif not children[0] is BTBehaviour:
+		warnings.append("Decorator node should have a BTBehaviour node as a child.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/bt_leaf.gd b/addons/behaviour_toolkit/behaviour_tree/bt_leaf.gd
index cc36a73..e2414e5 100644
--- a/addons/behaviour_toolkit/behaviour_tree/bt_leaf.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/bt_leaf.gd
@@ -1,6 +1,22 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTLeaf.svg")
 class_name BTLeaf extends BTBehaviour
 
 
 func tick(_delta: float, _actor: Node, _blackboard: Blackboard) -> BTStatus:
 	return BTStatus.SUCCESS
+
+
+func _get_configuration_warnings() -> PackedStringArray:
+	var warnings: Array = []
+	
+	var parent = get_parent()
+	var children = get_children()
+
+	if not parent is BTBehaviour and not parent is BTRoot:
+		warnings.append("BTLeaf node must be a child of BTBehaviour or BTRoot node.")
+	
+	if children.size() > 0:
+		warnings.append("BTLeaf node must not have any children.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/bt_leaf_integration.gd b/addons/behaviour_toolkit/behaviour_tree/bt_leaf_integration.gd
index 5deaff3..4268b4c 100644
--- a/addons/behaviour_toolkit/behaviour_tree/bt_leaf_integration.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/bt_leaf_integration.gd
@@ -1,5 +1,20 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTLeafIntegration.svg")
 class_name BTLeafIntegration extends BTLeaf
 
 
-@export var state_machine: FiniteStateMachine
+@export var state_machine: FiniteStateMachine:
+	set(value):
+		state_machine = value
+		update_configuration_warnings()
+
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	if state_machine == null:
+		warnings.append("No state machine set.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/bt_root.gd b/addons/behaviour_toolkit/behaviour_tree/bt_root.gd
index 8f0bc75..8d13551 100644
--- a/addons/behaviour_toolkit/behaviour_tree/bt_root.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/bt_root.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTRoot.svg")
 class_name BTRoot extends BehaviourToolkit
 ## Node used as a base parent (root) of a Behaviour Tree
@@ -32,6 +33,12 @@ var current_status: BTBehaviour.BTStatus
 
 
 func _ready() -> void:
+	# Don't run in editor
+	if Engine.is_editor_hint():
+		set_physics_process(false)
+		set_process(false)
+		return
+	
 	if blackboard == null:
 		blackboard = _create_local_blackboard()
 
@@ -68,3 +75,19 @@ func _create_local_blackboard() -> Blackboard:
 func _setup_processing() -> void:
 	set_physics_process(process_type == ProcessType.PHYSICS)
 	set_process(process_type == ProcessType.IDLE)
+
+
+func _get_configuration_warnings() -> PackedStringArray:
+	var warnings: Array = []
+	
+	var children = get_children()
+
+	if children.size() == 0:
+		warnings.append("Behaviour Tree needs to have one Behaviour child.")
+	elif children.size() == 1:
+		if not children[0] is BTBehaviour:
+			warnings.append("The child of Behaviour Tree needs to be a Behaviour.")
+	elif children.size() > 1:
+		warnings.append("Behaviour Tree can have only one Behaviour child.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/composites/bt_integrated_fsm.gd b/addons/behaviour_toolkit/behaviour_tree/composites/bt_integrated_fsm.gd
index 0ebe8b8..99a5004 100644
--- a/addons/behaviour_toolkit/behaviour_tree/composites/bt_integrated_fsm.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/composites/bt_integrated_fsm.gd
@@ -1,9 +1,14 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTCompositeIntegration.svg")
 class_name BTIntegratedFSM extends BTComposite
 
 
-@onready var state_machine: FiniteStateMachine = _get_machine()
+var state_machine: FiniteStateMachine = null
 
+func _ready():
+	if not Engine.is_editor_hint():
+		state_machine = _get_machine()
+		
 
 func tick(_delta: float, _actor: Node, _blackboard: Blackboard) -> BTStatus:
 	if state_machine.active == false:
@@ -20,3 +25,20 @@ func _get_machine() -> FiniteStateMachine:
 		return null
 	else:
 		return get_child(0)
+
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+	var children = get_children()
+
+	if children.size() == 0:
+		warnings.append("BTIntegratedFSM must have a child node. The first child will be used as the state machine.")
+
+	if children.size() > 1:
+		warnings.append("BTIntegratedFSM can only have one child node. The first child will be used as the state machine.")
+	
+	if children.size() == 1:
+		if not children[0] is FiniteStateMachine:
+			warnings.append("BTIntegratedFSM's child node must be a FiniteStateMachine. The first child will be used as the state machine.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/composites/bt_random_selector.gd b/addons/behaviour_toolkit/behaviour_tree/composites/bt_random_selector.gd
index 3bb75ad..ebb596f 100644
--- a/addons/behaviour_toolkit/behaviour_tree/composites/bt_random_selector.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/composites/bt_random_selector.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTCompositeRandomSelector.svg")
 class_name BTRandomSelector extends BTComposite
 ## The selector composite but with a random order of the leaves.
diff --git a/addons/behaviour_toolkit/behaviour_tree/composites/bt_random_sequence.gd b/addons/behaviour_toolkit/behaviour_tree/composites/bt_random_sequence.gd
index 6532eca..f219032 100644
--- a/addons/behaviour_toolkit/behaviour_tree/composites/bt_random_sequence.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/composites/bt_random_sequence.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTCompositeRandomSequence.svg")
 class_name BTRandomSequence extends BTComposite
 ## The squence composite but with a random order of the leaves.
diff --git a/addons/behaviour_toolkit/behaviour_tree/composites/bt_selector.gd b/addons/behaviour_toolkit/behaviour_tree/composites/bt_selector.gd
index ecc4876..9fdfaaa 100644
--- a/addons/behaviour_toolkit/behaviour_tree/composites/bt_selector.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/composites/bt_selector.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTCompositeSelector.svg")
 class_name BTSelector extends BTComposite
 ## Selects the first child that succeeds, or fails if none do.
diff --git a/addons/behaviour_toolkit/behaviour_tree/composites/bt_sequence.gd b/addons/behaviour_toolkit/behaviour_tree/composites/bt_sequence.gd
index 594bad2..9a0954c 100644
--- a/addons/behaviour_toolkit/behaviour_tree/composites/bt_sequence.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/composites/bt_sequence.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTCompositeSequence.svg")
 class_name BTSequence extends BTComposite
 ## A sequence node will return success if all of its children return success.
diff --git a/addons/behaviour_toolkit/behaviour_tree/composites/bt_simple_parallel.gd b/addons/behaviour_toolkit/behaviour_tree/composites/bt_simple_parallel.gd
index 95563d9..5e4b62b 100644
--- a/addons/behaviour_toolkit/behaviour_tree/composites/bt_simple_parallel.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/composites/bt_simple_parallel.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTSimpleParallel.svg")
 class_name BTSimpleParallel extends BTComposite
 ## Executes all children in parallel, and returns SUCCESS depending on the policy. It returns FAILURE if any child returns FAILURE.
diff --git a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_always_fail.gd b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_always_fail.gd
index 795131b..9ddaf1c 100644
--- a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_always_fail.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_always_fail.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTDecoratorFail.svg")
 class_name BTAlwaysFail extends BTDecorator
 ## The leaf will always fail after running.
diff --git a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_always_succeed.gd b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_always_succeed.gd
index 28ad106..5bbbf60 100644
--- a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_always_succeed.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_always_succeed.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTDecoratorSucceed.svg")
 class_name BTAlwaysSucceed extends BTDecorator
 ## The leaf will always succeed after running.
diff --git a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_inverter.gd b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_inverter.gd
index 0ba9264..5acc12f 100644
--- a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_inverter.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_inverter.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTDecoratorNot.svg")
 class_name BTInverter extends BTDecorator
 ## The result of the leaf is inverted.
diff --git a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_limiter.gd b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_limiter.gd
index 2cd16e1..a696c39 100644
--- a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_limiter.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_limiter.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTDecoratorLimiter.svg")
 class_name BTLimiter extends BTDecorator
 ## Limits the number of times a leaf can be run. (The leaf will fully run, before triggering the limit.)
diff --git a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_repeat.gd b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_repeat.gd
index c9d5976..c13a873 100644
--- a/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_repeat.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/decorators/decorator_repeat.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTDecoratorRepeat.svg")
 class_name BTRepeat extends BTDecorator
 ## Repeats the leaf a number of times.
diff --git a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_call.gd b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_call.gd
index c3951a4..f5fbb98 100644
--- a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_call.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_call.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTLeafCall.svg")
 class_name LeafCall extends BTLeaf
 ## Leaf that calls a method on a target node. The target can be the actor, the blackboard or a custom node.
@@ -6,39 +7,62 @@ class_name LeafCall extends BTLeaf
 
 ## The target type of the call. Can be the actor, the blackboard or a custom node.
 enum CallTarget {
-    ACTOR,          ## The actor node set on the BTRoot node.
-    BLACKBOARD,     ## The blackboard node set on the BTRoot node.
-    CUSTOM          ## A custom node set on the custom_target variable.
+	ACTOR,          ## The actor node set on the BTRoot node.
+	BLACKBOARD,     ## The blackboard node set on the BTRoot node.
+	CUSTOM          ## A custom node set on the custom_target variable.
 }
 
 
 ## The method to call on the target node.
-@export var method: StringName
+@export var method: StringName:
+	set(value):
+		method = value
+		update_configuration_warnings()
 ## The arguments to pass to the method.
 @export var arguments: Array = []
 
 @export_category("Target")
 ## The target type of the call. Can be the actor, the blackboard or a custom node.
-@export var target_type: CallTarget = CallTarget.ACTOR
+@export var target_type: CallTarget = CallTarget.ACTOR:
+	set(value):
+		target_type = value
+		update_configuration_warnings()
 ## The custom node to call the method on. Only used if target_type is set to CallTarget.CUSTOM.
-@export var custom_target: Node
+@export var custom_target: Node:
+	set(value):
+		custom_target = value
+		update_configuration_warnings()
 
 
 func tick(delta: float, actor: Node, blackboard: Blackboard):
-    var target
-
-    match target_type:
-        CallTarget.ACTOR:
-            target = actor
-        CallTarget.BLACKBOARD:
-            target = blackboard
-        CallTarget.CUSTOM:
-            target = custom_target
-    
-    if target.has_method(method):
-        target.callv(method, arguments)
-    else:
-        print("Method " + method + " not found on target " + target.to_string())
-        return BTStatus.FAILURE
-
-    return BTStatus.SUCCESS
+	var target
+
+	match target_type:
+		CallTarget.ACTOR:
+			target = actor
+		CallTarget.BLACKBOARD:
+			target = blackboard
+		CallTarget.CUSTOM:
+			target = custom_target
+	
+	if target.has_method(method):
+		target.callv(method, arguments)
+	else:
+		print("Method " + method + " not found on target " + target.to_string())
+		return BTStatus.FAILURE
+
+	return BTStatus.SUCCESS
+
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	if method == "":
+		warnings.append("Method is not set.")
+	
+	if target_type == CallTarget.CUSTOM and custom_target == null:
+		warnings.append("Target type is set to CUSTOM but no custom target is set.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_condition.gd b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_condition.gd
index b768a1e..c03f513 100644
--- a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_condition.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_condition.gd
@@ -6,38 +6,41 @@ class_name LeafCondition extends BTLeaf
 
 
 enum ConditionTarget {
-    ACTOR,
-    CUSTOM
+	ACTOR,
+	CUSTOM
 }
 
 
 enum ConditionValue {
-    STRING,
-    INT,
-    FLOAT,
-    BOOL
+	STRING,
+	INT,
+	FLOAT,
+	BOOL
 }
 
 
 enum ConditionType {
-    EQUAL,
-    NOT_EQUAL,
-    GREATER,
-    GREATER_EQUAL,
-    LESS,
-    LESS_EQUAL
+	EQUAL,
+	NOT_EQUAL,
+	GREATER,
+	GREATER_EQUAL,
+	LESS,
+	LESS_EQUAL
 }
 
 
 ## The property of the target node to query.
-@export var condition_property: StringName
+@export var condition_property: StringName:
+	set(value):
+		condition_property = value
+		update_configuration_warnings()
 ## The type of comparison to perform.
 @export var condition_type: ConditionType = ConditionType.EQUAL
 ## The type of the value to compare to.
 @export var value_type: ConditionValue = ConditionValue.STRING:
-    set(value):
-        value_type = value
-        notify_property_list_changed()
+	set(value):
+		value_type = value
+		notify_property_list_changed()
 ## The string value to compare to.
 @export var condition_value_string: String
 ## The int value to compare to.
@@ -49,51 +52,71 @@ enum ConditionType {
 
 @export_category("Target")
 ## The target node to query. If set to ACTOR, the actor will be queried.
-@export var target_type: ConditionTarget = ConditionTarget.ACTOR
+@export var target_type: ConditionTarget = ConditionTarget.ACTOR:
+	set(value):
+		target_type = value
+		update_configuration_warnings()
 ## The custom node to query. Only used if target_type is set to CUSTOM.
-@export var custom_target: Node
+@export var custom_target: Node:
+	set(value):
+		custom_target = value
+		update_configuration_warnings()
 
 
 func tick(delta: float, actor: Node, _blackboard: Blackboard):
-    var target: Node
-    match target_type:
-        ConditionTarget.ACTOR:
-            target = actor
-        ConditionTarget.CUSTOM:
-            target = custom_target
-    
-    var value: Variant
-    match value_type:
-        ConditionValue.STRING:
-            value = condition_value_string
-        ConditionValue.INT:
-            value = condition_value_int
-        ConditionValue.FLOAT:
-            value = condition_value_float
-        ConditionValue.BOOL:
-            value = condition_value_bool
-
-    var property_value = target.get(condition_property)
-
-    if property_value == null:
-        return BTStatus.FAILURE
-    
-    var result: bool
-    match condition_type:
-        ConditionType.EQUAL:
-            result = property_value == value
-        ConditionType.NOT_EQUAL:
-            result = property_value != value
-        ConditionType.GREATER:
-            result = property_value > value
-        ConditionType.GREATER_EQUAL:
-            result = property_value >= value
-        ConditionType.LESS:
-            result = property_value < value
-        ConditionType.LESS_EQUAL:
-            result = property_value <= value
-    
-    if not result:
-        return BTStatus.FAILURE
-
-    return BTStatus.SUCCESS
+	var target: Node
+	match target_type:
+		ConditionTarget.ACTOR:
+			target = actor
+		ConditionTarget.CUSTOM:
+			target = custom_target
+	
+	var value: Variant
+	match value_type:
+		ConditionValue.STRING:
+			value = condition_value_string
+		ConditionValue.INT:
+			value = condition_value_int
+		ConditionValue.FLOAT:
+			value = condition_value_float
+		ConditionValue.BOOL:
+			value = condition_value_bool
+
+	var property_value = target.get(condition_property)
+
+	if property_value == null:
+		return BTStatus.FAILURE
+	
+	var result: bool
+	match condition_type:
+		ConditionType.EQUAL:
+			result = property_value == value
+		ConditionType.NOT_EQUAL:
+			result = property_value != value
+		ConditionType.GREATER:
+			result = property_value > value
+		ConditionType.GREATER_EQUAL:
+			result = property_value >= value
+		ConditionType.LESS:
+			result = property_value < value
+		ConditionType.LESS_EQUAL:
+			result = property_value <= value
+	
+	if not result:
+		return BTStatus.FAILURE
+
+	return BTStatus.SUCCESS
+
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	if condition_property == "":
+		warnings.append("Condition property is empty.")
+	
+	if target_type == ConditionTarget.CUSTOM and custom_target == null:
+		warnings.append("Custom target is not assigned.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_event.gd b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_event.gd
index 055e9c2..9ab2c74 100644
--- a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_event.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_event.gd
@@ -1,11 +1,26 @@
+@tool
 class_name LeafFSMEvent extends BTLeafIntegration
 ## This node fires an event on a state machine.
 
 
-@export var event: String
+@export var event: StringName:
+	set(value):
+		event = value
+		update_configuration_warnings()
 @export var return_status: BTStatus = BTStatus.SUCCESS
 
 
 func tick(_delta: float, _actor: Node, _blackboard: Blackboard) -> BTStatus:
 	state_machine.fire_event(event)
 	return return_status
+
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	if event == "":
+		warnings.append("Event is empty.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_print.gd b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_print.gd
index 987d5d5..cd5bdcb 100644
--- a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_print.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_print.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTLeafPrint.svg")
 class_name LeafPrint extends BTLeaf
 
diff --git a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_signal.gd b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_signal.gd
index c8ed02c..969a4bc 100644
--- a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_signal.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_signal.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTLeafSignal.svg")
 class_name LeafSignal extends BTLeaf
 ## Leaf that emits a signal with optional array of arguments.
@@ -22,17 +23,26 @@ signal leaf_emitted(arguments_array: Array)
 
 
 ## The signal name to call on the target node.
-@export var signal_name: StringName
+@export var signal_name: StringName:
+	set(value):
+		signal_name = value
+		update_configuration_warnings()
 ## Array of arguments emitted with the [code]leaf_emitted/code] signal.
 @export var arguments: Array = []
 
 @export_category("Target")
 ## The target type to emit signal. Can be the actor, a custom node
 ## or [LeafSignal] own signal `leaf_emitted` (When target type is `Self`).
-@export var target_type: EmitTarget = EmitTarget.SELF
+@export var target_type: EmitTarget = EmitTarget.SELF:
+	set(value):
+		target_type = value
+		update_configuration_warnings()
 ## The custom node to call the method on. Only used if target_type
 ## is set toCallTarget.CUSTOM.
-@export var custom_target: Node
+@export var custom_target: Node:
+	set(value):
+		custom_target = value
+		update_configuration_warnings()
 
 
 
@@ -57,3 +67,16 @@ func tick(_delta: float, _actor: Node, _blackboard: Blackboard) -> BTStatus:
 
 	return BTStatus.SUCCESS
 
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	if signal_name == "":
+		warnings.append("Signal is not set.")
+	
+	if target_type == EmitTarget.CUSTOM and custom_target == null:
+		warnings.append("Target type is set to Custom but no custom target is set.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_tween.gd b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_tween.gd
index 15533d7..2f67890 100644
--- a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_tween.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_tween.gd
@@ -27,7 +27,10 @@ const DEFAULT_CUSTOM_SCRIPT = "# Custom Tween Value\nstatic func get_tween_value
 @export var duration: float = 2.0
 ## The property to tween.
 ## For example: "rotation:y" or "scale"
-@export var tween_property: String
+@export var tween_property: String:
+	set(value):
+		tween_property = value
+		update_configuration_warnings()
 ## The value type of the tween.
 @export var tween_value_type: TweenValueType: set = set_tween_value_type
 ## The integer value to tween to.
@@ -123,3 +126,14 @@ func _init_tween(actor: Node, blackboard: Blackboard):
 			tween.tween_property(actor, tween_property, tween_value, duration).as_relative()
 		else:
 			tween.tween_property(actor, tween_property, tween_value, duration)
+
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	if tween_property == "":
+		warnings.append("Tween property is empty.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_wait.gd b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_wait.gd
index fae3108..2c07b48 100644
--- a/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_wait.gd
+++ b/addons/behaviour_toolkit/behaviour_tree/leaves/leaf_wait.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/BTLeafWait.svg")
 class_name LeafWait extends BTLeaf
 
diff --git a/addons/behaviour_toolkit/finite_state_machine/fsm.gd b/addons/behaviour_toolkit/finite_state_machine/fsm.gd
index 3c70461..ed254ef 100644
--- a/addons/behaviour_toolkit/finite_state_machine/fsm.gd
+++ b/addons/behaviour_toolkit/finite_state_machine/fsm.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/FiniteStateMachine.svg")
 class_name FiniteStateMachine extends BehaviourToolkit
 ## An implementation of a simple finite state machine.
@@ -33,8 +34,10 @@ signal state_changed(state: FSMState)
 ## Whether the FSM is active or not.
 @export var active: bool = true
 ## The initial state of the FSM.
-@export var initial_state: FSMState
-
+@export var initial_state: FSMState:
+	set(value):
+		initial_state = value
+		update_configuration_warnings()
 ## The actor of the FSM.
 @export var actor: Node
 ## The blackboard of the FSM.
@@ -52,6 +55,12 @@ var current_bt_status: BTBehaviour.BTStatus
 
 
 func _ready() -> void:
+	# Don't run in editor
+	if Engine.is_editor_hint():
+		set_physics_process(false)
+		set_process(false)
+		return
+
 	connect("state_changed", _on_state_changed)
 
 	if blackboard == null:
@@ -163,3 +172,21 @@ func _setup_processing() -> void:
 
 func _on_state_changed(state: FSMState) -> void:
 	pass
+
+
+func _get_configuration_warnings() -> PackedStringArray:
+	var warnings: Array = []
+
+	if not initial_state:
+		warnings.append("Initial state is not set.")
+	
+	var children: Array = get_children()
+
+	if children.size() == 0:
+		warnings.append("No states found.")
+
+	for child in children:
+		if not child is FSMState:
+			warnings.append("Node '" + child.get_name() + "' is not a FSMState.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/finite_state_machine/fsm_state.gd b/addons/behaviour_toolkit/finite_state_machine/fsm_state.gd
index 9128f33..c95eb95 100644
--- a/addons/behaviour_toolkit/finite_state_machine/fsm_state.gd
+++ b/addons/behaviour_toolkit/finite_state_machine/fsm_state.gd
@@ -1,3 +1,4 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/FSMState.svg")
 class_name FSMState extends BehaviourToolkit
 ## A state in a [FiniteStateMachine].
@@ -8,6 +9,10 @@ var transitions: Array[FSMTransition] = []
 
 
 func _ready() -> void:
+	# Don't run in editor
+	if Engine.is_editor_hint():
+		return
+
 	for transition in get_children():
 		if transition is FSMTransition:
 			transitions.append(transition)
@@ -26,3 +31,13 @@ func _on_update(_delta: float, _actor: Node, _blackboard: Blackboard) -> void:
 ## Executes before the state is exited.
 func _on_exit(_actor: Node, _blackboard: Blackboard) -> void:
 	pass
+
+
+func _get_configuration_warnings():
+	var warnings = []
+
+	var parent: Node = get_parent()
+	if not parent is FiniteStateMachine:
+		warnings.append("FSMState should be a child of a FiniteStateMachine node.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/finite_state_machine/fsm_state_integrated_bt.gd b/addons/behaviour_toolkit/finite_state_machine/fsm_state_integrated_bt.gd
index 0dfe27d..c2add34 100644
--- a/addons/behaviour_toolkit/finite_state_machine/fsm_state_integrated_bt.gd
+++ b/addons/behaviour_toolkit/finite_state_machine/fsm_state_integrated_bt.gd
@@ -1,14 +1,20 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/FSMStateIntegration.svg")
 class_name FSMStateIntegratedBT extends FSMState
 
 
-
 @onready var behaviour_tree: BTRoot = _get_behaviour_tree()
 
 
-@export var fire_event_on_status: bool = false
+@export var fire_event_on_status: bool = false:
+	set(value):
+		fire_event_on_status = value
+		update_configuration_warnings()
 @export var on_status: BTBehaviour.BTStatus = BTBehaviour.BTStatus.SUCCESS
-@export var event: String
+@export var event: String:
+	set(value):
+		event = value
+		update_configuration_warnings()
 
 
 ## Executes after the state is entered.
@@ -29,6 +35,10 @@ func _on_exit(_actor: Node, _blackboard: Blackboard) -> void:
 
 
 func _get_behaviour_tree() -> BTRoot:
+	# Don't run in editor
+	if Engine.is_editor_hint():
+		return null
+
 	if get_child_count() == 0:
 		return null
 	
@@ -37,3 +47,25 @@ func _get_behaviour_tree() -> BTRoot:
 			return child
 
 	return null
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	var children: Array = get_children()
+
+	var has_root: bool = false
+	for child in children:
+		if child is BTRoot:
+			has_root = true
+		elif not child is FSMTransition:
+			warnings.append("FSMStateIntegratedBT can only have BTRoot and FSMTransition children.")
+	
+	if not has_root:
+		warnings.append("FSMStateIntegratedBT must have a BTRoot child node.")
+	
+	if fire_event_on_status and event == "":
+		warnings.append("FSMStateIntegratedBT has fire_event_on_status enabled, but no event is set.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/finite_state_machine/fsm_state_integration_return.gd b/addons/behaviour_toolkit/finite_state_machine/fsm_state_integration_return.gd
index ff0011b..f16066e 100644
--- a/addons/behaviour_toolkit/finite_state_machine/fsm_state_integration_return.gd
+++ b/addons/behaviour_toolkit/finite_state_machine/fsm_state_integration_return.gd
@@ -22,3 +22,16 @@ func _on_update(_delta: float, _actor: Node, _blackboard: Blackboard) -> void:
 ## Executes before the state is exited.
 func _on_exit(_actor: Node, _blackboard: Blackboard) -> void:
 	pass
+
+
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	var fsm_parent: Node = get_parent().get_parent()
+
+	if not fsm_parent is BTIntegratedFSM:
+		warnings.append("Can only return from a BTIntegratedFSM.")
+
+	return warnings
diff --git a/addons/behaviour_toolkit/finite_state_machine/fsm_transition.gd b/addons/behaviour_toolkit/finite_state_machine/fsm_transition.gd
index 7971efe..97995f8 100644
--- a/addons/behaviour_toolkit/finite_state_machine/fsm_transition.gd
+++ b/addons/behaviour_toolkit/finite_state_machine/fsm_transition.gd
@@ -1,16 +1,26 @@
+@tool
 @icon("res://addons/behaviour_toolkit/icons/FSMTransition.svg")
 class_name FSMTransition extends BehaviourToolkit
 ## A transition between two [FSMState]s in a [FiniteStateMachine].
 
 
 ## The state to transition to.
-@export var next_state: FSMState
+@export var next_state: FSMState:
+	set(value):
+		next_state = value
+		update_configuration_warnings()
 
 @export_category("Transition Logic")
 ## If true, the FSM will check for the event to trigger the transition.
-@export var use_event: bool = false
+@export var use_event: bool = false:
+	set(value):
+		use_event = value
+		update_configuration_warnings()
 ## The event that triggers the transition.
-@export var event: String = ""
+@export var event: String = "":
+	set(value):
+		event = value
+		update_configuration_warnings()
 
 
 ## Executed when the transition is taken.
@@ -33,3 +43,19 @@ func is_valid_event(current_event: String) -> bool:
 ## Returns which state to transition to, when valid.
 func get_next_state() -> FSMState:
 	return next_state
+
+
+func _get_configuration_warnings():
+	var warnings = []
+
+	var parent: Node = get_parent()
+	if not parent is FSMState:
+		warnings.append("FSMTransition should be a child of FSMState.")
+	
+	if not next_state:
+		warnings.append("FSMTransition has no next state.")
+	
+	if use_event and event == "":
+		warnings.append("FSMTransition has no event set.")
+
+	return warnings
diff --git a/script_templates/BTComposite/new_composite.gd b/script_templates/BTComposite/new_composite.gd
index 0765848..7fbb7df 100644
--- a/script_templates/BTComposite/new_composite.gd
+++ b/script_templates/BTComposite/new_composite.gd
@@ -1,3 +1,4 @@
+@tool
 extends BTComposite
 
 
@@ -8,3 +9,15 @@ func tick(_delta: float, _actor: Node, _blackboard: Blackboard) -> BTStatus:
 	# Return BTStatus depending on the result of the leaves
 	# Return BTStatus.RUNNING, if there are still leaves to tick
 	return BTStatus.SUCCESS
+
+
+# Add custom configuration warnings
+# Note: Can be deleted if you don't want to define your own warnings.
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	# Add your own warnings to the array here
+
+	return warnings
diff --git a/script_templates/BTDecorator/new_decorator.gd b/script_templates/BTDecorator/new_decorator.gd
index 91cc4e8..6315d99 100644
--- a/script_templates/BTDecorator/new_decorator.gd
+++ b/script_templates/BTDecorator/new_decorator.gd
@@ -1,3 +1,4 @@
+@tool
 extends BTDecorator
 
 
@@ -9,3 +10,15 @@ func tick(_delta: float, _actor: Node, _blackboard: Blackboard) -> BTStatus:
 	# Augment the response of the leaf
 
 	return response
+
+
+# Add custom configuration warnings
+# Note: Can be deleted if you don't want to define your own warnings.
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	# Add your own warnings to the array here
+
+	return warnings
diff --git a/script_templates/BTLeaf/new_leaf.gd b/script_templates/BTLeaf/new_leaf.gd
index fe8c488..7d0d4be 100644
--- a/script_templates/BTLeaf/new_leaf.gd
+++ b/script_templates/BTLeaf/new_leaf.gd
@@ -1,3 +1,4 @@
+@tool
 extends BTLeaf
 
 
@@ -6,3 +7,15 @@ func tick(_delta: float, _actor: Node, _blackboard: Blackboard) -> BTStatus:
 	# Handle leaf logic
 	# Return SUCCESS, FAILURE, or RUNNING
 	return BTStatus.SUCCESS
+
+
+# Add custom configuration warnings
+# Note: Can be deleted if you don't want to define your own warnings.
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	# Add your own warnings to the array here
+
+	return warnings
diff --git a/script_templates/FSMState/new_state.gd b/script_templates/FSMState/new_state.gd
index 0d00ace..4e52802 100644
--- a/script_templates/FSMState/new_state.gd
+++ b/script_templates/FSMState/new_state.gd
@@ -1,3 +1,4 @@
+@tool
 extends FSMState
 
 
@@ -14,3 +15,15 @@ func _on_update(_delta: float, _actor: Node, _blackboard: Blackboard) -> void:
 # Executes before the state is exited.
 func _on_exit(_actor: Node, _blackboard: Blackboard) -> void:
 	pass
+
+
+# Add custom configuration warnings
+# Note: Can be deleted if you don't want to define your own warnings.
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	# Add your own warnings to the array here
+
+	return warnings
diff --git a/script_templates/FSMTransition/new_transition.gd b/script_templates/FSMTransition/new_transition.gd
index 2061de0..de5fe45 100644
--- a/script_templates/FSMTransition/new_transition.gd
+++ b/script_templates/FSMTransition/new_transition.gd
@@ -1,3 +1,4 @@
+@tool
 extends FSMTransition
 
 # Executed when the transition is taken.
@@ -8,3 +9,15 @@ func _on_transition(_delta: float, _actor: Node, _blackboard: Blackboard) -> voi
 # Evaluates true, if the transition conditions are met.
 func is_valid(_actor: Node, _blackboard: Blackboard) -> bool:
 	return false
+
+
+# Add custom configuration warnings
+# Note: Can be deleted if you don't want to define your own warnings.
+func _get_configuration_warnings():
+	var warnings: Array = []
+
+	warnings.append_array(super._get_configuration_warnings())
+
+	# Add your own warnings to the array here
+
+	return warnings