Add experimental flag

custom_nodes/example_node.py.example

@@ -26,6 +26,9 @@ class Example:
     DEPRECATED (`bool`):
         Indicates whether the node is deprecated. Deprecated nodes are hidden by default in the UI, but remain
         functional in existing workflows that use them.
+    EXPERIMENTAL (`bool`):
+        Indicates whether the node is experimental. Experimental nodes are marked as such in the UI and may be subject to
+        significant changes or removal in future versions. Use with caution in production workflows.
     execute(s) -> tuple || None:
         The entry point method. The name of this method must be the same as the value of property `FUNCTION`.
         For example, if `FUNCTION = "execute"` then this method's name must be `execute`, if `FUNCTION = "foo"` then it must be `foo`.

server.py

@@ -445,6 +445,8 @@ class PromptServer():
 
             if getattr(obj_class, "DEPRECATED", False):
                 info['deprecated'] = True
+            if getattr(obj_class, "EXPERIMENTAL", False):
+                info['experimental'] = True
             return info
 
         @routes.get("/object_info")