diff --git a/meta-opencentauri/recipes-data/klipper-afc-addon/files/afc.cfg b/meta-opencentauri/recipes-data/klipper-afc-addon/files/afc.cfg
index 7d47978f..e9ea382c 100644
--- a/meta-opencentauri/recipes-data/klipper-afc-addon/files/afc.cfg
+++ b/meta-opencentauri/recipes-data/klipper-afc-addon/files/afc.cfg
@@ -3,6 +3,15 @@
 # UPDATES WILL RESET THIS FILE. YOUR EDITS WILL BE LOST WHEN UPDATING.
 # -----
 
+# Variables shared by the BT_* helper macros below. Upstream AFC ships these in
+# AFC_Macro_Vars.cfg; COSMOS only needs the ones its macros read.
+[gcode_macro _AFC_GLOBAL_VARS]
+description: Global variables used in multiple macros
+gcode: # Leave Empty
+variable_stepper_name             : 'CANVAS_'  # Lane name prefix, BT_CHANGE_TOOL LANE=2 becomes CHANGE_TOOL LANE=CANVAS_2
+variable_disable_skew_correction  : False      # When True macros disable and re-enable skew correction around kinematic moves
+variable_verbose                  : 1          # Console output for macros
+
 # Eject Loaded Lane
 [gcode_macro BT_TOOL_UNLOAD]
 description: Unloads the currently loaded lane