diff --git a/packages/elements/src/attachments.tsx b/packages/elements/src/attachments.tsx
index cc7b2495..a9ce4102 100644
--- a/packages/elements/src/attachments.tsx
+++ b/packages/elements/src/attachments.tsx
@@ -371,12 +371,18 @@ export const AttachmentRemove = ({
 
 export type AttachmentHoverCardProps = ComponentProps<typeof HoverCard>;
 
-export const AttachmentHoverCard = ({
-  openDelay = 0,
-  closeDelay = 0,
-  ...props
-}: AttachmentHoverCardProps) => (
-  <HoverCard closeDelay={closeDelay} openDelay={openDelay} {...props} />
+// Open/close with no delay. Radix's HoverCard takes these props; Base UI's
+// PreviewCard — what `shadcn add` swaps in on a Base UI project — has neither,
+// so naming them in a typed position fails to compile there. Spreading keeps the
+// behaviour on Radix and is inert on Base UI. A caller's own props still win,
+// since they spread last.
+const NO_DELAY = {
+  closeDelay: 0,
+  openDelay: 0,
+} as unknown as ComponentProps<typeof HoverCard>;
+
+export const AttachmentHoverCard = (props: AttachmentHoverCardProps) => (
+  <HoverCard {...NO_DELAY} {...props} />
 );
 
 export type AttachmentHoverCardTriggerProps = ComponentProps<
diff --git a/packages/elements/src/context.tsx b/packages/elements/src/context.tsx
index 53e28851..7a165e75 100644
--- a/packages/elements/src/context.tsx
+++ b/packages/elements/src/context.tsx
@@ -42,6 +42,16 @@ const useContextValue = () => {
 
 export type ContextProps = ComponentProps<typeof HoverCard> & ContextSchema;
 
+// Open/close with no delay. Radix's HoverCard takes these props; Base UI's
+// PreviewCard — what `shadcn add` swaps in on a Base UI project — has neither,
+// so naming them in a typed position fails to compile there. Spreading keeps the
+// behaviour on Radix and is inert on Base UI. A caller's own props still win,
+// since they spread last.
+const NO_DELAY = {
+  closeDelay: 0,
+  openDelay: 0,
+} as unknown as ComponentProps<typeof HoverCard>;
+
 export const Context = ({
   usedTokens,
   maxTokens,
@@ -56,7 +66,7 @@ export const Context = ({
 
   return (
     <ContextContext.Provider value={contextValue}>
-      <HoverCard closeDelay={0} openDelay={0} {...props} />
+      <HoverCard {...NO_DELAY} {...props} />
     </ContextContext.Provider>
   );
 };
diff --git a/packages/elements/src/inline-citation.tsx b/packages/elements/src/inline-citation.tsx
index 171c81cf..a6ec9790 100644
--- a/packages/elements/src/inline-citation.tsx
+++ b/packages/elements/src/inline-citation.tsx
@@ -49,8 +49,18 @@ export const InlineCitationText = ({
 
 export type InlineCitationCardProps = ComponentProps<typeof HoverCard>;
 
+// Open/close with no delay. Radix's HoverCard takes these props; Base UI's
+// PreviewCard — what `shadcn add` swaps in on a Base UI project — has neither,
+// so naming them in a typed position fails to compile there. Spreading keeps the
+// behaviour on Radix and is inert on Base UI. A caller's own props still win,
+// since they spread last.
+const NO_DELAY = {
+  closeDelay: 0,
+  openDelay: 0,
+} as unknown as ComponentProps<typeof HoverCard>;
+
 export const InlineCitationCard = (props: InlineCitationCardProps) => (
-  <HoverCard closeDelay={0} openDelay={0} {...props} />
+  <HoverCard {...NO_DELAY} {...props} />
 );
 
 export type InlineCitationCardTriggerProps = ComponentProps<typeof Badge> & {
diff --git a/packages/elements/src/prompt-input.tsx b/packages/elements/src/prompt-input.tsx
index 412c846d..d7b7306d 100644
--- a/packages/elements/src/prompt-input.tsx
+++ b/packages/elements/src/prompt-input.tsx
@@ -1317,12 +1317,18 @@ export const PromptInputSelectValue = ({
 
 export type PromptInputHoverCardProps = ComponentProps<typeof HoverCard>;
 
-export const PromptInputHoverCard = ({
-  openDelay = 0,
-  closeDelay = 0,
-  ...props
-}: PromptInputHoverCardProps) => (
-  <HoverCard closeDelay={closeDelay} openDelay={openDelay} {...props} />
+// Open/close with no delay. Radix's HoverCard takes these props; Base UI's
+// PreviewCard — what `shadcn add` swaps in on a Base UI project — has neither,
+// so naming them in a typed position fails to compile there. Spreading keeps the
+// behaviour on Radix and is inert on Base UI. A caller's own props still win,
+// since they spread last.
+const NO_DELAY = {
+  closeDelay: 0,
+  openDelay: 0,
+} as unknown as ComponentProps<typeof HoverCard>;
+
+export const PromptInputHoverCard = (props: PromptInputHoverCardProps) => (
+  <HoverCard {...NO_DELAY} {...props} />
 );
 
 export type PromptInputHoverCardTriggerProps = ComponentProps<