diff --git a/static/js/cookbook.js b/static/js/cookbook.js
index 73965faf..124f883d 100644
--- a/static/js/cookbook.js
+++ b/static/js/cookbook.js
@@ -2802,6 +2802,7 @@ function _renderRecipes() {
   html += '<div class="memory-category-filters">';
   html += '<input type="text" class="memory-search-input" id="serve-search" placeholder="Search cached models\u2026" style="flex:1;min-width:120px;" />';
   html += '<button class="memory-toolbar-btn" id="hwfit-cache-select">Select</button>';
+  html += '<button class="memory-toolbar-btn" id="hwfit-cache-scan" title="Rescan model cache" style="margin-left:4px;">Scan</button>';
   html += '</div>';
   html += '<div class="doclib-lang-chips" id="serve-tags"></div>';
   html += '</div>';
diff --git a/static/js/cookbookRunning.js b/static/js/cookbookRunning.js
index 3fd77cfa..a76bc316 100644
--- a/static/js/cookbookRunning.js
+++ b/static/js/cookbookRunning.js
@@ -3948,6 +3948,12 @@ async function _pollBackgroundStatus() {
           _showDiagnosis(el, task._backendDiagnosis, task.output || '');
         }
         completedDeps.forEach(t => _refreshDepsAfterInstall(t));
+        // Ulysses: when a download finishes, invalidate the model scan cache
+        // so the Serve tab doesn't show stale results.
+        const justDownloaded = localTasks.filter(t => t.type === 'download' && t.status === 'done');
+        if (justDownloaded.length) {
+          try { localStorage.removeItem('cookbook_cached_models_scan_v1'); } catch {}
+        }
       }
     } catch (_) { /* non-fatal: background status should never break polling */ }