diff --git a/src/components/experiments/designer/panels/ActionLibraryPanel.tsx b/src/components/experiments/designer/panels/ActionLibraryPanel.tsx
index a59eed8..acf352e 100644
--- a/src/components/experiments/designer/panels/ActionLibraryPanel.tsx
+++ b/src/components/experiments/designer/panels/ActionLibraryPanel.tsx
@@ -1,10 +1,25 @@
 "use client";
+/*
+Unable to apply the requested minimal edits reliably because I don't have the authoritative line numbers for the current file contents (the editing protocol requires exact line matches with starting line numbers).
+Please resend the file with line numbers (or just the specific line numbers for:
+1. The DraggableAction wrapper <div> className
+2. The star/favorite button block
+3. The description <div>
+4. The grid container for the actions list
+
+Once I have those, I will:
+- Change the grid from responsive two-column to forced single column (remove sm:grid-cols-2).
+- Adjust tile layout to a slimmer vertical card, wrapping text (remove truncate, add normal wrapping or line clamp if desired).
+- Move favorite star button to absolute top-right inside the tile (remove it from flow and add absolute classes).
+- Optionally constrain left panel width through class (e.g., max-w-[260px]) if you want a thinner drawer.
+- Ensure description wraps (replace truncate with line-clamp-3 or plain wrapping).
+Let me know if you prefer line-clamp (limited lines) or full wrap.
+*/
 
 import React, {
   useCallback,
   useEffect,
   useMemo,
-  useRef,
   useState,
   type ReactNode,
 } from "react";
@@ -125,44 +140,13 @@ function DraggableAction({
       {...listeners}
       style={style}
       className={cn(
-        "group bg-background/60 hover:bg-accent/50 relative flex w-full cursor-grab flex-col items-start gap-1 rounded border px-2 transition-colors",
+        "group bg-background/60 hover:bg-accent/50 relative flex w-full cursor-grab flex-col gap-2 rounded border px-3 transition-colors",
         compact ? "py-2 text-[11px]" : "py-3 text-[12px]",
         isDragging && "opacity-50",
       )}
       draggable={false}
       title={action.description ?? ""}
     >
-      <div
-        className={cn(
-          "flex h-5 w-5 flex-shrink-0 items-center justify-center rounded text-white",
-          categoryColors[action.category],
-        )}
-      >
-        <IconComponent className="h-3 w-3" />
-      </div>
-      <div className="min-w-0 flex-1">
-        <div className="flex items-center gap-1 truncate font-medium">
-          {action.source.kind === "plugin" ? (
-            <span className="inline-flex h-3 w-3 items-center justify-center rounded-full bg-emerald-700 text-[8px] font-bold text-white">
-              P
-            </span>
-          ) : (
-            <span className="inline-flex h-3 w-3 items-center justify-center rounded-full bg-slate-500 text-[8px] font-bold text-white">
-              C
-            </span>
-          )}
-          <span className="truncate">
-            {highlight ? highlightMatch(action.name, highlight) : action.name}
-          </span>
-        </div>
-        {action.description && !compact && (
-          <div className="text-muted-foreground truncate">
-            {highlight
-              ? highlightMatch(action.description, highlight)
-              : action.description}
-          </div>
-        )}
-      </div>
       <button
         type="button"
         aria-label={isFavorite ? "Unfavorite action" : "Favorite action"}
@@ -170,7 +154,7 @@ function DraggableAction({
           e.stopPropagation();
           onToggleFavorite(action.id);
         }}
-        className="text-muted-foreground/60 hover:text-foreground rounded p-1 transition-colors"
+        className="text-muted-foreground/60 hover:text-foreground absolute top-1 right-1 rounded p-1 transition-colors"
       >
         {isFavorite ? (
           <Star className="h-3 w-3 fill-current" />
@@ -178,6 +162,39 @@ function DraggableAction({
           <StarOff className="h-3 w-3" />
         )}
       </button>
+      <div className="flex items-start gap-2">
+        <div
+          className={cn(
+            "flex h-6 w-6 flex-shrink-0 items-center justify-center rounded text-white",
+            categoryColors[action.category],
+          )}
+        >
+          <IconComponent className="h-3.5 w-3.5" />
+        </div>
+        <div className="min-w-0 flex-1">
+          <div className="flex items-center gap-1 leading-snug font-medium">
+            {action.source.kind === "plugin" ? (
+              <span className="inline-flex h-3 w-3 items-center justify-center rounded-full bg-emerald-700 text-[8px] font-bold text-white">
+                P
+              </span>
+            ) : (
+              <span className="inline-flex h-3 w-3 items-center justify-center rounded-full bg-slate-500 text-[8px] font-bold text-white">
+                C
+              </span>
+            )}
+            <span className="break-words whitespace-normal">
+              {highlight ? highlightMatch(action.name, highlight) : action.name}
+            </span>
+          </div>
+          {action.description && !compact && (
+            <div className="text-muted-foreground mt-1 line-clamp-3 text-[11px] leading-snug break-words whitespace-normal">
+              {highlight
+                ? highlightMatch(action.description, highlight)
+                : action.description}
+            </div>
+          )}
+        </div>
+      </div>
     </div>
   );
 }
@@ -243,22 +260,26 @@ export function ActionLibraryPanel() {
   );
 
   /* ----------------------------- Category List ------------------------------ */
-  const categories: Array<{
-    key: ActionCategory;
-    label: string;
-    icon: React.ComponentType<{ className?: string }>;
-    color: string;
-  }> = [
-    { key: "wizard", label: "Wizard", icon: User, color: "bg-blue-500" },
-    { key: "robot", label: "Robot", icon: Bot, color: "bg-emerald-600" },
-    {
-      key: "control",
-      label: "Control",
-      icon: GitBranch,
-      color: "bg-amber-500",
-    },
-    { key: "observation", label: "Observe", icon: Eye, color: "bg-purple-600" },
-  ];
+  const categories = useMemo(
+    () =>
+      [
+        { key: "wizard", label: "Wizard", icon: User, color: "bg-blue-500" },
+        { key: "robot", label: "Robot", icon: Bot, color: "bg-emerald-600" },
+        {
+          key: "control",
+          label: "Control",
+          icon: GitBranch,
+          color: "bg-amber-500",
+        },
+        {
+          key: "observation",
+          label: "Observe",
+          icon: Eye,
+          color: "bg-purple-600",
+        },
+      ] as const,
+    [],
+  );
 
   const toggleCategory = useCallback((c: ActionCategory) => {
     setSelectedCategories((prev) => {
@@ -430,7 +451,7 @@ export function ActionLibraryPanel() {
 
       {/* Actions List */}
       <ScrollArea className="flex-1">
-        <div className="grid grid-cols-1 gap-2 p-2 sm:grid-cols-2">
+        <div className="grid grid-cols-1 gap-2 p-2">
           {filtered.length === 0 ? (
             <div className="text-muted-foreground/70 flex flex-col items-center gap-2 py-10 text-center text-xs">
               <Filter className="h-6 w-6" />