diff --git a/graph/graph.go b/graph/graph.go
index f231d59..39dfed8 100644
--- a/graph/graph.go
+++ b/graph/graph.go
@@ -35,6 +35,10 @@ const (
 	NodeTypeQuality NodeType = "quality"
 	// NodeTypeExecution represents an execution journal node
 	NodeTypeExecution NodeType = "execution"
+	// NodeTypeOperations represents an operations orchestration node
+	NodeTypeOperations NodeType = "operations"
+	// NodeTypeSystem is an alias for NodeKindSystem for backward compatibility
+	NodeTypeSystem NodeType = "system"
 )
 
 // NodeKind classifies a node by the ecosystem view to which it belongs.
@@ -62,7 +66,7 @@ func ParseNodeKind(s string) (NodeKind, error) {
 // ParseNodeType normalizes a graph node type.
 func ParseNodeType(s string) (NodeType, error) {
 	switch NodeType(strings.ToLower(strings.TrimSpace(s))) {
-	case NodeTypeAgent, NodeTypeTool, NodeTypeFunction, NodeTypeStart, NodeTypeEnd, NodeTypeRouter, NodeTypeQuality, NodeTypeExecution:
+	case NodeTypeAgent, NodeTypeTool, NodeTypeFunction, NodeTypeStart, NodeTypeEnd, NodeTypeRouter, NodeTypeQuality, NodeTypeExecution, NodeTypeOperations:
 		return NodeType(strings.ToLower(strings.TrimSpace(s))), nil
 	default:
 		return "", fmt.Errorf("graph: unknown node type %q", s)