diff --git a/visual_workflow_builder/frontend_v4/src/components/ToolPalette.tsx b/visual_workflow_builder/frontend_v4/src/components/ToolPalette.tsx
index b19cc1187..a1dc4a3f9 100644
--- a/visual_workflow_builder/frontend_v4/src/components/ToolPalette.tsx
+++ b/visual_workflow_builder/frontend_v4/src/components/ToolPalette.tsx
@@ -53,6 +53,13 @@ function mapCatalogAction(action: CatalogAction): ActionDefinition | null {
   };
 }
 
+function mergeCatalogActions(catalogActions: ActionDefinition[]): ActionDefinition[] {
+  const byType = new Map<ActionType, ActionDefinition>();
+  ACTIONS.forEach(action => byType.set(action.type, action));
+  catalogActions.forEach(action => byType.set(action.type, action));
+  return ACTIONS.map(action => byType.get(action.type) || action);
+}
+
 export default function ToolPalette() {
   // État des catégories dépliées (toutes fermées par défaut sauf 'mouse')
   const [expandedCategories, setExpandedCategories] = useState<string[]>(['mouse']);
@@ -73,7 +80,7 @@ export default function ToolPalette() {
           .map((action: CatalogAction) => mapCatalogAction(action))
           .filter((action: ActionDefinition | null): action is ActionDefinition => action !== null);
         if (!cancelled && mapped.length > 0) {
-          setCatalogActions(mapped);
+          setCatalogActions(mergeCatalogActions(mapped));
         }
       } catch (error) {
         console.warn('Catalogue VWB indisponible, palette statique utilisée:', error);