diff --git a/src/components/ui/RichTextEditor.stories.tsx b/src/components/ui/RichTextEditor.stories.tsx
index c89b646..3d10271 100644
--- a/src/components/ui/RichTextEditor.stories.tsx
+++ b/src/components/ui/RichTextEditor.stories.tsx
@@ -1,4 +1,6 @@
 import type { Meta, StoryObj } from "@storybook/react";
+import { WandSparkles } from "lucide-react";
+import { fn } from "storybook/test";
 import { RichTextEditor } from "./rich-text-editor";
 import { Label } from "./label";
 
@@ -14,6 +16,7 @@ const meta = {
     },
     placeholder: { control: "text" },
     defaultValue: { control: "text" },
+    contentAction: { control: false },
   },
   decorators: [
     (Story) => (
@@ -28,7 +31,7 @@ export default meta;
 
 type Story = StoryObj<typeof meta>;
 
-/** Full toolbar variant with all formatting options including font size, image, undo/redo, and more. */
+/** Full toolbar variant with all formatting options. Content action is hidden by default. */
 export const Default: Story = {
   args: {
     variant: "full",
@@ -75,3 +78,32 @@ export const WithLabel: Story = {
     placeholder: "Enter your description here...",
   },
 };
+
+/** Show the bottom-right content action button with default sparkles icon (no text). */
+export const ContentActionIconOnly: Story = {
+  args: {
+    variant: "full",
+    placeholder: "Icon-only content action...",
+    contentAction: {
+      show: true,
+      onClick: fn(),
+    },
+  },
+};
+
+/** Replace the default sparkles button with custom icon, label, and click handler. */
+export const ContentActionCustom: Story = {
+  args: {
+    variant: "full",
+    placeholder: "Try the custom AI action...",
+    contentAction: {
+      show: true,
+      title: "Rewrite with AI",
+      showContent: true,
+      icon: <WandSparkles className="size-4 text-sky-600" />,
+      content: <span className="text-xs">Rewrite</span>,
+      className: "border border-border bg-background px-2",
+      onClick: fn(),
+    },
+  },
+};
diff --git a/src/components/ui/index.ts b/src/components/ui/index.ts
index 510ab30..70cd463 100644
--- a/src/components/ui/index.ts
+++ b/src/components/ui/index.ts
@@ -74,7 +74,11 @@ export {
 } from "./sortable";
 export { Switch, LabeledSwitch, SwitchCard, type SwitchProps, type LabeledSwitchProps, type SwitchCardProps } from "./switch";
 export { Textarea } from "./textarea";
-export { RichTextEditor, type RichTextEditorProps } from "./rich-text-editor";
+export {
+  RichTextEditor,
+  type RichTextEditorProps,
+  type RichTextEditorContentAction,
+} from "./rich-text-editor";
 export { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from "./tooltip";
 export { Toggle } from './toggle'
 export { ToggleGroup, ToggleGroupItem } from './toggle-group'
diff --git a/src/components/ui/rich-text-editor.tsx b/src/components/ui/rich-text-editor.tsx
index 831379d..709a68d 100644
--- a/src/components/ui/rich-text-editor.tsx
+++ b/src/components/ui/rich-text-editor.tsx
@@ -18,6 +18,16 @@ import {
 
 import { cn } from "@/lib/utils";
 
+interface RichTextEditorContentAction {
+  show?: boolean;
+  showContent?: boolean;
+  title?: string;
+  icon?: React.ReactNode;
+  content?: React.ReactNode;
+  onClick?: () => void;
+  className?: string;
+}
+
 interface RichTextEditorProps {
   value?: string;
   defaultValue?: string;
@@ -25,6 +35,7 @@ interface RichTextEditorProps {
   placeholder?: string;
   className?: string;
   variant?: "full" | "simple";
+  contentAction?: RichTextEditorContentAction;
 }
 
 function RichTextEditor({
@@ -34,6 +45,7 @@ function RichTextEditor({
   placeholder = "Start typing...",
   className = "",
   variant = "full",
+  contentAction,
 }: RichTextEditorProps) {
   const editorRef = React.useRef<HTMLDivElement>(null);
   const [fontSize, setFontSize] = React.useState("14 px");
@@ -90,6 +102,12 @@ function RichTextEditor({
     executeCommand("formatBlock", formatMap[e.target.value] || "p");
   };
 
+  const showContentAction = contentAction?.show ?? false;
+  const showContentActionContent = contentAction?.showContent ?? false;
+  const contentActionIcon = contentAction?.icon === undefined
+    ? <Sparkles className="size-4 text-muted-foreground" />
+    : contentAction.icon;
+
   return (
     <div
       className={cn(
@@ -312,12 +330,20 @@ function RichTextEditor({
             minHeight: variant === "full" ? "100px" : "120px",
           }}
         />
-        <button
-          type="button"
-          className="absolute bottom-2 right-2 p-1.5 hover:bg-muted rounded"
-        >
-          <Sparkles className="size-4 text-muted-foreground" />
-        </button>
+        {showContentAction && (
+          <button
+            type="button"
+            className={cn(
+              "absolute bottom-2 right-2 inline-flex items-center gap-1.5 p-1.5 hover:bg-muted rounded",
+              contentAction?.className,
+            )}
+            title={contentAction?.title ?? "AI Assist"}
+            onClick={contentAction?.onClick}
+          >
+            {contentActionIcon}
+            {showContentActionContent ? contentAction?.content : null}
+          </button>
+        )}
       </div>
 
       <style>{`
@@ -334,4 +360,8 @@ function RichTextEditor({
   );
 }
 
-export { RichTextEditor, type RichTextEditorProps };
+export {
+  RichTextEditor,
+  type RichTextEditorProps,
+  type RichTextEditorContentAction,
+};