diff --git a/.changeset/olive-parts-ring.md b/.changeset/olive-parts-ring.md
new file mode 100644
index 0000000000..a7371ce912
--- /dev/null
+++ b/.changeset/olive-parts-ring.md
@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Add support for button actions
diff --git a/bun.lock b/bun.lock
index b7d5adcd99..8965ac6cfc 100644
--- a/bun.lock
+++ b/bun.lock
@@ -346,7 +346,7 @@
     "react-dom": "catalog:",
   },
   "catalog": {
-    "@gitbook/api": "0.154.0",
+    "@gitbook/api": "0.155.0",
     "@scalar/api-client-react": "^1.3.46",
     "@tsconfig/node20": "^20.1.6",
     "@tsconfig/strictest": "^2.0.6",
@@ -727,7 +727,7 @@
 
     "@fortawesome/fontawesome-svg-core": ["@fortawesome/fontawesome-svg-core@7.1.0", "", { "dependencies": { "@fortawesome/fontawesome-common-types": "7.1.0" } }, "sha512-fNxRUk1KhjSbnbuBxlWSnBLKLBNun52ZBTcs22H/xEEzM6Ap81ZFTQ4bZBxVQGQgVY0xugKGoRcCbaKjLQ3XZA=="],
 
-    "@gitbook/api": ["@gitbook/api@0.154.0", "", { "dependencies": { "event-iterator": "^2.0.0", "eventsource-parser": "^3.0.0" } }, "sha512-huEgWWa2H+H4ofYEAQl9r49u0gVjDHHWVNJKhd6SgGCfefjNPHkQj9zaky/5DBQzlu/+SDmutWiOtYdrykQO8w=="],
+    "@gitbook/api": ["@gitbook/api@0.155.0", "", { "dependencies": { "event-iterator": "^2.0.0", "eventsource-parser": "^3.0.0" } }, "sha512-g4UfJRnej/GZ9pORHcS9mV0kKiJLRvhMlGOeOoEVU/LSIz6s35VDqauSBs7rH00AOaMABDg7uEko8tUSA4aaww=="],
 
     "@gitbook/browser-types": ["@gitbook/browser-types@workspace:packages/browser-types"],
 
diff --git a/package.json b/package.json
index adf3c65d60..9b30e2d6ef 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
         "catalog": {
             "@tsconfig/strictest": "^2.0.6",
             "@tsconfig/node20": "^20.1.6",
-            "@gitbook/api": "0.154.0",
+            "@gitbook/api": "0.155.0",
             "@scalar/api-client-react": "^1.3.46",
             "@types/react": "^19.0.0",
             "@types/react-dom": "^19.0.0",
diff --git a/packages/gitbook/src/components/DocumentView/InlineActionButton.tsx b/packages/gitbook/src/components/DocumentView/InlineActionButton.tsx
new file mode 100644
index 0000000000..1d148a1edf
--- /dev/null
+++ b/packages/gitbook/src/components/DocumentView/InlineActionButton.tsx
@@ -0,0 +1,75 @@
+'use client';
+import { tString, useLanguage } from '@/intl/client';
+import { useAI, useAIChatController, useAIChatState } from '../AI';
+import { useSearch } from '../Search';
+import { Button, type ButtonProps, Input } from '../primitives';
+
+export function InlineActionButton(
+    props: { action: 'ask' | 'search'; query?: string } & { buttonProps: ButtonProps } // TODO: Type this properly: Pick<api.DocumentInlineButton, 'action' | 'query'> & { buttonProps: ButtonProps }
+) {
+    const { action, query, buttonProps } = props;
+
+    const { assistants } = useAI();
+    const chatController = useAIChatController();
+    const chatState = useAIChatState();
+    const [, setSearchState] = useSearch();
+    const language = useLanguage();
+
+    const handleSubmit = (value: string) => {
+        if (action === 'ask') {
+            chatController.open();
+            if (value ?? query) {
+                chatController.postMessage({ message: value ?? query });
+            }
+        } else if (action === 'search') {
+            setSearchState((prev) => ({
+                ...prev,
+                ask: null,
+                scope: 'default',
+                query: value ?? query,
+                open: true,
+            }));
+        }
+    };
+
+    const icon =
+        action === 'ask' && buttonProps.icon === 'gitbook-assistant' && assistants.length > 0
+            ? assistants[0]?.icon
+            : buttonProps.icon;
+
+    if (!query) {
+        return (
+            <Input
+                inline
+                label={buttonProps.label as string}
+                sizing="medium"
+                className="inline-flex max-w-full leading-normal [transition-property:translate,opacity,box-shadow,background,border]"
+                submitButton={{
+                    label: tString(language, action === 'ask' ? 'send' : 'search'),
+                }}
+                clearButton={{
+                    className: 'text-[1em]',
+                }}
+                maxLength={action === 'ask' ? 2048 : 512}
+                disabled={action === 'ask' && chatState.loading}
+                aria-busy={action === 'ask' && chatState.loading}
+                leading={icon}
+                keyboardShortcut={false}
+                onSubmit={(value) => handleSubmit(value as string)}
+                containerStyle={{
+                    width: `${buttonProps.label ? buttonProps.label.toString().length + 10 : 20}ch`,
+                }}
+            />
+        );
+    }
+
+    const label = action === 'ask' ? `Ask "${query}"` : `Search for "${query}"`;
+
+    const button = (
+        <Button {...buttonProps} onClick={() => handleSubmit(query)} label={label}>
+            {label !== buttonProps.label ? buttonProps.label : null}
+        </Button>
+    );
+
+    return button;
+}
diff --git a/packages/gitbook/src/components/DocumentView/InlineButton.tsx b/packages/gitbook/src/components/DocumentView/InlineButton.tsx
index 2257e20439..283dc757d3 100644
--- a/packages/gitbook/src/components/DocumentView/InlineButton.tsx
+++ b/packages/gitbook/src/components/DocumentView/InlineButton.tsx
@@ -1,44 +1,65 @@
 import { resolveContentRef, resolveContentRefFallback } from '@/lib/references';
-import * as api from '@gitbook/api';
+import type * as api from '@gitbook/api';
 import type { IconName } from '@gitbook/icons';
-import { Button } from '../primitives';
+import { Button, type ButtonProps } from '../primitives';
 import type { InlineProps } from './Inline';
+import { InlineActionButton } from './InlineActionButton';
 import { NotFoundRefHoverCard } from './NotFoundRefHoverCard';
 
-export async function InlineButton(props: InlineProps<api.DocumentInlineButton>) {
-    const { inline, context } = props;
+export function InlineButton(props: InlineProps<api.DocumentInlineButton>) {
+    const { inline } = props;
 
-    const resolved = context.contentContext
-        ? await resolveContentRef(inline.data.ref, context.contentContext)
-        : null;
+    const buttonProps: ButtonProps = {
+        label: inline.data.label,
+        variant: inline.data.kind,
+        icon: inline.data.icon as IconName | undefined,
+    };
 
-    const href = resolved?.href ?? resolveContentRefFallback(inline.data.ref)?.href;
+    const ButtonImplementation = () => {
+        if ('action' in inline.data && 'query' in inline.data.action) {
+            return (
+                <InlineActionButton
+                    action={inline.data.action.action}
+                    query={inline.data.action.query ?? ''}
+                    buttonProps={buttonProps}
+                />
+            );
+        }
+
+        return <InlineLinkButton {...props} buttonProps={buttonProps} />;
+    };
 
     const inlineElement = (
         // Set the leading to have some vertical space between adjacent buttons
         <span className="inline-button leading-12 [&:has(+.inline-button)]:mr-2">
-            <Button
-                href={href}
-                label={inline.data.label}
-                // TODO: use a variant specifically for user-defined buttons.
-                variant={inline.data.kind}
-                className="leading-normal"
-                disabled={href === undefined}
-                icon={inline.data.icon as IconName | undefined}
-                insights={{
-                    type: 'link_click',
-                    link: {
-                        target: inline.data.ref,
-                        position: api.SiteInsightsLinkPosition.Content,
-                    },
-                }}
-            />
+            <ButtonImplementation />
         </span>
     );
 
-    if (!resolved) {
-        return <NotFoundRefHoverCard context={context}>{inlineElement}</NotFoundRefHoverCard>;
+    return inlineElement;
+}
+
+export async function InlineLinkButton(
+    props: InlineProps<api.DocumentInlineButton> & { buttonProps: ButtonProps }
+) {
+    const { inline, context, buttonProps } = props;
+
+    if (!('ref' in inline.data)) return;
+
+    const resolved =
+        context.contentContext && inline.data.ref
+            ? await resolveContentRef(inline.data.ref, context.contentContext)
+            : null;
+
+    const href =
+        resolved?.href ??
+        (inline.data.ref ? resolveContentRefFallback(inline.data.ref)?.href : undefined);
+
+    const button = <Button {...buttonProps} href={href} disabled={href === undefined} />;
+
+    if (inline.data.ref && !resolved) {
+        return <NotFoundRefHoverCard context={context}>{button}</NotFoundRefHoverCard>;
     }
 
-    return inlineElement;
+    return button;
 }
diff --git a/packages/gitbook/src/components/primitives/Input.tsx b/packages/gitbook/src/components/primitives/Input.tsx
index 5f5a819cee..b3beb25b88 100644
--- a/packages/gitbook/src/components/primitives/Input.tsx
+++ b/packages/gitbook/src/components/primitives/Input.tsx
@@ -15,6 +15,7 @@ type CustomInputProps = {
     trailing?: React.ReactNode;
     sizing?: 'medium' | 'large'; // The `size` prop is already taken by the HTML input element.
     containerRef?: React.RefObject<HTMLDivElement | null>;
+    containerStyle?: React.CSSProperties;
     /**
      * A submit button, shown to the right of the input.
      */
@@ -63,6 +64,7 @@ export const Input = React.forwardRef<InputElement, InputProps>((props, passedRe
         keyboardShortcut,
         onSubmit,
         containerRef,
+        containerStyle,
         resize = false,
         // HTML attributes we need to read
         value: passedValue,
@@ -153,7 +155,7 @@ export const Input = React.forwardRef<InputElement, InputProps>((props, passedRe
     };
 
     const inputClassName = tcls(
-        'peer -m-2 max-h-64 grow resize-none text-left outline-none placeholder:text-tint/8 aria-busy:cursor-progress',
+        'peer -m-2 max-h-64 grow shrink resize-none text-left outline-none placeholder:text-tint/8 placeholder-shown:text-ellipsis aria-busy:cursor-progress',
         sizes[sizing].input
     );
 
@@ -197,10 +199,11 @@ export const Input = React.forwardRef<InputElement, InputProps>((props, passedRe
                 }
             }}
             ref={containerRef}
+            style={containerStyle}
         >
             <Tag
                 className={tcls(
-                    'flex grow',
+                    'flex shrink grow',
                     sizes[sizing].gap,
                     multiline ? 'items-start' : 'items-center'
                 )}
@@ -209,14 +212,12 @@ export const Input = React.forwardRef<InputElement, InputProps>((props, passedRe
                     <Tag
                         className={tcls(
                             clearButton && hasValue ? 'group-focus-within/input:hidden' : '',
-                            multiline ? 'my-1.25' : ''
+                            multiline ? 'my-1.25' : '',
+                            'text-tint'
                         )}
                     >
                         {typeof leading === 'string' ? (
-                            <Icon
-                                icon={leading as IconName}
-                                className="size-4 shrink-0 text-tint"
-                            />
+                            <Icon icon={leading as IconName} className="size-4 shrink-0" />
                         ) : (
                             leading
                         )}