diff --git a/site/src/pages/AgentsPage/components/ChatConversation/ConversationTimeline.stories.tsx b/site/src/pages/AgentsPage/components/ChatConversation/ConversationTimeline.stories.tsx
index 210bfe4ce1..66b2e9cee9 100644
--- a/site/src/pages/AgentsPage/components/ChatConversation/ConversationTimeline.stories.tsx
+++ b/site/src/pages/AgentsPage/components/ChatConversation/ConversationTimeline.stories.tsx
@@ -939,3 +939,59 @@ export const ThinkingOnlyAssistantSpacing: Story = {
 		expect(canvas.getByText("Any progress?")).toBeInTheDocument();
 	},
 };
+
+/**
+ * Regression: sources-only assistant messages must have consistent
+ * bottom spacing before the next user bubble. A spacer div fills the
+ * gap that would normally come from the hidden action bar.
+ */
+export const SourcesOnlyAssistantSpacing: Story = {
+	args: {
+		...defaultArgs,
+		parsedMessages: buildMessages([
+			{
+				...baseMessage,
+				id: 1,
+				role: "user",
+				content: [{ type: "text", text: "Can you share your sources?" }],
+			},
+			{
+				...baseMessage,
+				id: 2,
+				role: "assistant",
+				content: [
+					{
+						type: "source",
+						url: "https://example.com/docs",
+						title: "Documentation",
+					},
+					{
+						type: "source",
+						url: "https://example.com/api",
+						title: "API Reference",
+					},
+				],
+			},
+			{
+				...baseMessage,
+				id: 3,
+				role: "user",
+				content: [{ type: "text", text: "Thanks!" }],
+			},
+		]),
+	},
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+		expect(canvas.getByText("Can you share your sources?")).toBeInTheDocument();
+		expect(canvas.getByText("Thanks!")).toBeInTheDocument();
+		await userEvent.click(
+			canvas.getByRole("button", { name: /searched 2 results/i }),
+		);
+		expect(
+			canvas.getByRole("link", { name: "Documentation" }),
+		).toBeInTheDocument();
+		expect(
+			canvas.getByRole("link", { name: "API Reference" }),
+		).toBeInTheDocument();
+	},
+};
diff --git a/site/src/pages/AgentsPage/components/ChatConversation/ConversationTimeline.tsx b/site/src/pages/AgentsPage/components/ChatConversation/ConversationTimeline.tsx
index 0db14d35dd..2992c1b4dc 100644
--- a/site/src/pages/AgentsPage/components/ChatConversation/ConversationTimeline.tsx
+++ b/site/src/pages/AgentsPage/components/ChatConversation/ConversationTimeline.tsx
@@ -516,6 +516,11 @@ const ChatMessageItem = memo<{
 			userInlineContent.length > 0 || Boolean(parsed.markdown?.trim());
 		const hasFileBlocks = userFileBlocks.length > 0;
 		const hasCopyableContent = Boolean(parsed.markdown.trim());
+		const needsAssistantBottomSpacer =
+			!hideActions &&
+			!isUser &&
+			!hasCopyableContent &&
+			(Boolean(parsed.reasoning) || parsed.sources.length > 0);
 
 		const conversationItemProps: { role: "user" | "assistant" } = {
 			role: isUser ? "user" : "assistant",
@@ -670,12 +675,9 @@ const ChatMessageItem = memo<{
 						</div>
 					)}
 				{/* Spacer for assistant messages without an action bar
-				   (e.g. thinking-only) so they have consistent bottom
-				   padding before the next user bubble. */}
-				{!hideActions &&
-					!isUser &&
-					!hasCopyableContent &&
-					Boolean(parsed.reasoning) && <div className="min-h-6" />}
+				   (e.g. reasoning-only or sources-only) so they have
+				   consistent bottom padding before the next user bubble. */}
+				{needsAssistantBottomSpacer && <div className="min-h-6" />}
 				{previewImage && (
 					<ImageLightbox
 						src={previewImage}