diff --git a/.claude/skills/skd-validate/scripts/skd-validate.ps1 b/.claude/skills/skd-validate/scripts/skd-validate.ps1
index 6f8eb918..ead1a77e 100644
--- a/.claude/skills/skd-validate/scripts/skd-validate.ps1
+++ b/.claude/skills/skd-validate/scripts/skd-validate.ps1
@@ -655,8 +655,10 @@ function Check-StructureItem {
 	if ($script:stopped) { return }
 
 	$xsiType = $itemNode.GetAttribute("type", "http://www.w3.org/2001/XMLSchema-instance")
-	# StructureItemGroup — дефолтный тип, platform эмитит <dcsset:item> без xsi:type.
-	if (-not $xsiType) { $xsiType = 'dcsset:StructureItemGroup' }
+	if (-not $xsiType) {
+		Report-Error "Variant '$variantName': structure item missing xsi:type"
+		return
+	}
 	if ($validStructureTypes -notcontains $xsiType) {
 		Report-Warn "Variant '$variantName': unusual structure item type '$xsiType'"
 	}
diff --git a/.claude/skills/skd-validate/scripts/skd-validate.py b/.claude/skills/skd-validate/scripts/skd-validate.py
index e5935bec..fc0555ca 100644
--- a/.claude/skills/skd-validate/scripts/skd-validate.py
+++ b/.claude/skills/skd-validate/scripts/skd-validate.py
@@ -622,9 +622,9 @@ def check_structure_item(item_node, variant_name):
         return
 
     xsi_type = item_node.get(XSI_TYPE, "")
-    # StructureItemGroup — дефолтный тип, platform эмитит <dcsset:item> без xsi:type.
     if not xsi_type:
-        xsi_type = "dcsset:StructureItemGroup"
+        report_error(f"Variant '{variant_name}': structure item missing xsi:type")
+        return
     if xsi_type not in valid_structure_types:
         report_warn(f"Variant '{variant_name}': unusual structure item type '{xsi_type}'")