diff --git a/index.html b/index.html
index 4e79690..950586c 100644
--- a/index.html
+++ b/index.html
@@ -2057,7 +2057,9 @@ async function runGithubScan() {
         const url = `${apiBase}/atlas/github-scan?token=${encodeURIComponent(token)}${org ? '&org=' + encodeURIComponent(org) : ''}`;
         const res = await fetch(url);
         if (!res.ok) { const e = await res.json().catch(() => ({})); throw new Error(e.error || `HTTP ${res.status}`); }
-        const repos = await res.json();
+        const raw = await res.json();
+        const repos = Array.isArray(raw) ? raw : (raw.repos || []);
+        const isFallback = !Array.isArray(raw) && raw.fallback;
 
         let added = 0;
         // Add GitHub org/user as cloud node if not present
@@ -2090,8 +2092,9 @@ async function runGithubScan() {
         initGraph();
         setTimeout(fitGraph, 500);
         statusEl.className = 'scan-status visible ok';
-        statusEl.textContent = `${repos.length} リポジトリ検出 — ${added} 件追加`;
-        showToast(`GitHub: ${added} リポジトリを追加しました`);
+        const fallbackNote = isFallback ? ' (ユーザーリポジトリにフォールバック)' : '';
+        statusEl.textContent = `${repos.length} リポジトリ検出 — ${added} 件追加${fallbackNote}`;
+        showToast(`GitHub: ${added} リポジトリを追加しました${fallbackNote}`);
     } catch (e) {
         statusEl.className = 'scan-status visible err';
         statusEl.textContent = `エラー: ${e.message}`;