chore: housekeeping

server/src/handlers/graph.rs

@@ -977,8 +977,8 @@ impl McpTool for GetSubgraphHandler {
 
     async fn execute(&self, args: Value, state: Arc<MemoryState>) -> crate::error::Result<String> {
         let req: GetSubgraphTool = serde_json::from_value(args).map_err(|e| e.to_string())?;
-        let root = req.root_entity.or(req.root_node).ok_or_else(|| {
-            crate::error::AppError::Internal("root_entity or root_node is required".to_string())
+        let root = req.root_entity.ok_or_else(|| {
+            crate::error::AppError::Internal("root_entity is required".to_string())
         })?;
         let depth = req.depth.unwrap_or(2);
         let format = req.format.unwrap_or(SubgraphFormat::Json);
@@ -1043,7 +1043,7 @@ impl McpTool for GetSubgraphHandler {
         }
 
         let result = serde_json::json!({
-            "root_node": root,
+            "root_entity": root,
             "depth": depth,
             "entities": matched_entities,
             "relations": matched_relations,