diff --git a/web/pages/Assistants.tsx b/web/pages/Assistants.tsx
index 1da3915..e33ffb8 100644
--- a/web/pages/Assistants.tsx
+++ b/web/pages/Assistants.tsx
@@ -1959,10 +1959,22 @@ export const DebugDrawer: React.FC<{
   const fetchRuntimeMetadata = async (): Promise<Record<string, any>> => {
     const localResolved = buildLocalResolvedRuntime();
     setResolvedConfigView(JSON.stringify(localResolved, null, 2));
-    return {
+    const mergedMetadata: Record<string, any> = {
       ...localResolved.sessionStartMetadata,
       ...(sessionMetadataExtras || {}),
     };
+    // Engine resolves trusted runtime config by top-level assistant/app ID.
+    // Keep these IDs at metadata root so backend /assistants/{id}/config is reachable.
+    if (!mergedMetadata.assistantId && assistant.id) {
+      mergedMetadata.assistantId = assistant.id;
+    }
+    if (!mergedMetadata.appId && assistant.id) {
+      mergedMetadata.appId = assistant.id;
+    }
+    if (!mergedMetadata.channel) {
+      mergedMetadata.channel = 'web_debug';
+    }
+    return mergedMetadata;
   };
 
   const closeWs = () => {