Cannot reference other scripts from @tool script

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1

Godot Version

v4.3.stable.official [77dcf97d8]

Question

I have a tool script that looks like:

@tool
extends Node
@export var obj : NamedClass
func _process(delta: float) -> void:
	if is_instance_valid(obj):
		print(obj.get_value())

and another script that is

extends Node
class_name NamedClass
var value := 1337 : get = get_value
func get_value() -> int:
	return value

The scene tree is just theses two nodes, the tool is the root, and the NamedClass is the only child.
In the inspector I can put a reference to the NamedClass node in the tool node.
The is_instance_valid(obj) recognizes that the reference exists but the obj.get_value() doesn’t work.
The error says:

res://tool_script.gd:8 - Invalid call. Nonexistent function 'get_value' in base 'Node (NamedClass)'.

which is weird because the editor knows that the function does exists, as it autocomplete when I’m typing, and if I print out the obj.get_method_list() the method I’m trying to access is there.
The error only shows in the editor, if I run the scene it works as intended.
Also worth noting that I can access the value if I tag it as @export, but this completely ignores the getter.

My question then is two-fold:

  1. Is there a way to access the functions without making the NamedClass also a tool?
  2. Why does the error says that the function doesn’t exist?