diff --git a/bun.lock b/bun.lock
index 2f8612e21d..df0b146b0b 100644
--- a/bun.lock
+++ b/bun.lock
@@ -360,7 +360,7 @@
     "react-dom": "catalog:",
   },
   "catalog": {
-    "@gitbook/api": "0.182.0",
+    "@gitbook/api": "0.183.0",
     "@scalar/api-client-react": "^1.3.46",
     "@tsconfig/node20": "^20.1.6",
     "@tsconfig/strictest": "^2.0.6",
@@ -756,7 +756,7 @@
 
     "@fortawesome/fontawesome-svg-core": ["@fortawesome/fontawesome-svg-core@7.2.0", "", { "dependencies": { "@fortawesome/fontawesome-common-types": "7.2.0" } }, "sha512-6639htZMjEkwskf3J+e6/iar+4cTNM9qhoWuRfj9F3eJD6r7iCzV1SWnQr2Mdv0QT0suuqU8BoJCZUyCtP9R4Q=="],
 
-    "@gitbook/api": ["@gitbook/api@0.182.0", "", { "dependencies": { "event-iterator": "^2.0.0", "eventsource-parser": "^3.0.0" } }, "sha512-O5CgVzbRL2esrsQJ816UcHMqY22fsMFAeLRQ8Gapus4S+/teXk3nf5YU5T10o3112niSD3QeNp2uIcsyMGOweg=="],
+    "@gitbook/api": ["@gitbook/api@0.183.0", "", { "dependencies": { "event-iterator": "^2.0.0", "eventsource-parser": "^3.0.0" } }, "sha512-0+6VyRH7me5AtzU+mwZVFHDaJudtnHYEcxwQ/qO7p2swj7dOe/dOevfaphgx+pUvhXAg7VVlihETaAW/WsLTzQ=="],
 
     "@gitbook/browser-types": ["@gitbook/browser-types@workspace:packages/browser-types"],
 
diff --git a/package.json b/package.json
index 941d91b2c0..043afbe96f 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
         "catalog": {
             "@tsconfig/strictest": "^2.0.6",
             "@tsconfig/node20": "^20.1.6",
-            "@gitbook/api": "0.182.0",
+            "@gitbook/api": "0.183.0",
             "@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/Integration/ContentKitWithAdaptiveVisitorContext.tsx b/packages/gitbook/src/components/DocumentView/Integration/ContentKitWithAdaptiveVisitorContext.tsx
new file mode 100644
index 0000000000..3d174632df
--- /dev/null
+++ b/packages/gitbook/src/components/DocumentView/Integration/ContentKitWithAdaptiveVisitorContext.tsx
@@ -0,0 +1,28 @@
+'use client';
+
+import { useAdaptiveVisitor } from '@/components/Adaptive';
+import { ContentKit, type ContentKitClientContextData } from '@gitbook/react-contentkit/client';
+import React from 'react';
+
+type ContentKitProps<RenderContext> = React.ComponentProps<typeof ContentKit<RenderContext>>;
+
+/**
+ * ContentKit wrapper for integration blocks that need client-only adaptive context.
+ */
+export function ContentKitWithAdaptiveVisitorContext<RenderContext>(
+    props: ContentKitProps<RenderContext>
+) {
+    const getAdaptiveVisitorClaims = useAdaptiveVisitor();
+    const visitorClaims = getAdaptiveVisitorClaims();
+
+    const clientContext = React.useMemo<ContentKitClientContextData>(
+        () => ({
+            getVisitorContext: () => ({
+                visitor: visitorClaims?.visitor ?? null,
+            }),
+        }),
+        [visitorClaims]
+    );
+
+    return <ContentKit {...props} clientContext={clientContext} />;
+}
diff --git a/packages/gitbook/src/components/DocumentView/Integration/IntegrationBlock.tsx b/packages/gitbook/src/components/DocumentView/Integration/IntegrationBlock.tsx
index 4befa2953e..6286bbce7e 100644
--- a/packages/gitbook/src/components/DocumentView/Integration/IntegrationBlock.tsx
+++ b/packages/gitbook/src/components/DocumentView/Integration/IntegrationBlock.tsx
@@ -5,6 +5,8 @@ import { ContentKit, ContentKitOutput } from '@gitbook/react-contentkit';
 
 import type { BlockProps } from '../Block';
 import './contentkit.css';
+import { ContentKitWithAdaptiveVisitorContext } from './ContentKitWithAdaptiveVisitorContext';
+import { shouldRenderIntegrationBlockWithAdaptiveVisitorContext } from './adaptive';
 import { contentKitServerContext } from './contentkit';
 import { fetchSafeIntegrationUI } from './render';
 import { renderIntegrationUi } from './server-actions';
@@ -68,9 +70,15 @@ export async function IntegrationBlock(props: BlockProps<DocumentBlockIntegratio
         return null;
     }
 
+    const ContentKitComponent = shouldRenderIntegrationBlockWithAdaptiveVisitorContext(
+        initialOutput
+    )
+        ? ContentKitWithAdaptiveVisitorContext
+        : ContentKit;
+
     return (
         <div className={tcls(style)}>
-            <ContentKit
+            <ContentKitComponent
                 renderContext={{
                     integrationName: block.data.integration,
                 }}
@@ -80,7 +88,7 @@ export async function IntegrationBlock(props: BlockProps<DocumentBlockIntegratio
                 render={renderIntegrationUi}
             >
                 <ContentKitOutput output={initialOutput} context={contentKitServerContext} />
-            </ContentKit>
+            </ContentKitComponent>
         </div>
     );
 }
diff --git a/packages/gitbook/src/components/DocumentView/Integration/adaptive.ts b/packages/gitbook/src/components/DocumentView/Integration/adaptive.ts
new file mode 100644
index 0000000000..162f0f631d
--- /dev/null
+++ b/packages/gitbook/src/components/DocumentView/Integration/adaptive.ts
@@ -0,0 +1,67 @@
+import type {
+    ContentKitDescendantElement,
+    ContentKitRenderOutput,
+    ContentKitRootElement,
+    ContentKitStepper,
+} from '@gitbook/api';
+
+type ContentKitElement = ContentKitRootElement | ContentKitDescendantElement | ContentKitStepper;
+
+/**
+ * Decide whether an integration block should expose Adaptive visitor context to webframes.
+ */
+export function shouldRenderIntegrationBlockWithAdaptiveVisitorContext(
+    output: ContentKitRenderOutput
+) {
+    if (output.type === 'complete') {
+        return false;
+    }
+
+    return (
+        output.canAccessVisitorClaims === true &&
+        doesContentKitElementContainWebframe(output.element)
+    );
+}
+
+/**
+ * Check whether a ContentKit element tree contains a webframe element.
+ */
+function doesContentKitElementContainWebframe(element: ContentKitElement): boolean {
+    switch (element.type) {
+        case 'webframe':
+            return true;
+        case 'block':
+        case 'box':
+        case 'hstack':
+        case 'vstack':
+        case 'step':
+        case 'modal':
+        case 'configuration':
+        case 'stepper':
+        case 'card':
+            return doesContentKitElementArrayContainWebframe(element.children);
+        case 'codeblock':
+            return (
+                doesContentKitElementArrayContainWebframe(element.header) ||
+                doesContentKitElementArrayContainWebframe(element.footer)
+            );
+        default:
+            return false;
+    }
+}
+
+function doesContentKitElementArrayContainWebframe(elements: unknown): boolean {
+    if (!Array.isArray(elements)) {
+        return doesContentKitElementContainWebframeValue(elements);
+    }
+
+    return elements.some(doesContentKitElementContainWebframeValue);
+}
+
+function doesContentKitElementContainWebframeValue(value: unknown): boolean {
+    if (typeof value !== 'object' || value === null || !('type' in value)) {
+        return false;
+    }
+
+    return doesContentKitElementContainWebframe(value as ContentKitElement);
+}
diff --git a/packages/react-contentkit/package.json b/packages/react-contentkit/package.json
index d16e6d6362..c74eb4e0c3 100644
--- a/packages/react-contentkit/package.json
+++ b/packages/react-contentkit/package.json
@@ -6,6 +6,10 @@
         ".": {
             "types": "./dist/index.d.ts",
             "default": "./dist/index.js"
+        },
+        "./client": {
+            "types": "./dist/client.d.ts",
+            "default": "./dist/client.js"
         }
     },
     "sideEffects": false,
diff --git a/packages/react-contentkit/src/ContentKit.tsx b/packages/react-contentkit/src/ContentKit.tsx
index 4f413f367a..985e8f20db 100644
--- a/packages/react-contentkit/src/ContentKit.tsx
+++ b/packages/react-contentkit/src/ContentKit.tsx
@@ -10,6 +10,7 @@ import React from 'react';
 
 import {
     ContentKitClientContext,
+    type ContentKitClientContextData,
     type ContentKitClientContextType,
     type ContentKitRenderUpdate,
     type ContentKitSecurity,
@@ -28,6 +29,8 @@ export function ContentKit<RenderContext>(props: {
     renderContext: RenderContext;
     /** Security configuration */
     security: ContentKitSecurity;
+    /** Client-only contextual data for client-rendered elements */
+    clientContext?: ContentKitClientContextData;
     /** Initial input being displayed */
     initialInput: RequestRenderIntegrationUI;
     /** Initial output being displayed */
@@ -58,6 +61,7 @@ export function ContentKit<RenderContext>(props: {
     const {
         renderContext,
         security,
+        clientContext,
         initialInput,
         initialOutput,
         children: initialChildren,
@@ -125,6 +129,7 @@ export function ContentKit<RenderContext>(props: {
     const renderer = React.useMemo<ContentKitClientContextType>(() => {
         return {
             security,
+            clientContext,
             state: current.state,
             setState: (newState) => {
                 setCurrent((latest) => ({
@@ -184,7 +189,7 @@ export function ContentKit<RenderContext>(props: {
                 }
             },
         };
-    }, [update, security, current.state, current.input.context, setCurrent, render]);
+    }, [update, security, clientContext, current.state, current.input.context, setCurrent, render]);
 
     const onSubViewAction = React.useCallback(async (action: ContentKitAction) => {
         switch (action.action) {
@@ -208,6 +213,7 @@ export function ContentKit<RenderContext>(props: {
                 <ContentKit
                     renderContext={renderContext}
                     security={security}
+                    clientContext={clientContext}
                     initialInput={subView.initialInput}
                     initialOutput={subView.initialOutput}
                     render={render}
diff --git a/packages/react-contentkit/src/ElementWebframe.tsx b/packages/react-contentkit/src/ElementWebframe.tsx
index e0474087a6..26cd8f4900 100644
--- a/packages/react-contentkit/src/ElementWebframe.tsx
+++ b/packages/react-contentkit/src/ElementWebframe.tsx
@@ -4,7 +4,7 @@ import type { ContentKitWebFrame } from '@gitbook/api';
 import React from 'react';
 
 import { Icon } from '@gitbook/icons';
-import { useContentKitClientContext } from './context';
+import { type ContentKitClientContextData, useContentKitClientContext } from './context';
 import { resolveDynamicBinding } from './dynamic';
 import type { ContentKitClientElementProps } from './types';
 
@@ -47,7 +47,7 @@ export function ElementWebframe(props: ContentKitClientElementProps<ContentKitWe
                 messagesQueueRef.current.push(message);
             }
         },
-        [renderer.security]
+        [element.source.url, renderer.security]
     );
 
     // Listen to messages coming from the webframe
@@ -146,19 +146,21 @@ export function ElementWebframe(props: ContentKitClientElementProps<ContentKitWe
         };
     }, [renderer, sendMessage]);
 
-    // Send data to the webframe
+    // Send data and client-only visitor context as state to the webframe.
     React.useEffect(() => {
-        if (!element.data) {
-            return;
-        }
-
-        const state: Record<string, string> = {};
-        Object.entries(element.data).forEach(([key, value]) => {
-            state[key] = resolveDynamicBinding(renderer.state, value);
+        const abort = { cancelled: false };
+        sendWebframeState({
+            elementData: element.data,
+            rendererState: renderer.state,
+            clientContext: renderer.clientContext,
+            sendMessage,
+            abort,
         });
 
-        return sendMessage({ state });
-    }, [element.data, renderer.state, sendMessage]);
+        return () => {
+            abort.cancelled = true;
+        };
+    }, [element.data, renderer.state, renderer.clientContext, sendMessage]);
 
     const height = size.height ? Math.max(size.height, MIN_HEIGHT) : undefined;
 
@@ -192,3 +194,59 @@ export function ElementWebframe(props: ContentKitClientElementProps<ContentKitWe
         />
     );
 }
+
+type WebframeState = Record<string, unknown>;
+
+/**
+ * Resolve configured webframe data bindings against the current ContentKit state.
+ */
+function resolveWebframeState(
+    elementData: ContentKitWebFrame['data'],
+    rendererState: object
+): WebframeState {
+    const state: WebframeState = {};
+
+    if (!elementData) {
+        return state;
+    }
+
+    Object.entries(elementData).forEach(([key, value]) => {
+        state[key] = resolveDynamicBinding(rendererState, value);
+    });
+
+    return state;
+}
+
+/**
+ * Read optional client-only visitor context.
+ */
+async function resolveVisitorContext(clientContext: ContentKitClientContextData | undefined) {
+    return await clientContext?.getVisitorContext?.();
+}
+
+/**
+ * Send the combined webframe state once visitor context has been resolved.
+ */
+async function sendWebframeState(args: {
+    elementData: ContentKitWebFrame['data'];
+    rendererState: object;
+    clientContext: ContentKitClientContextData | undefined;
+    sendMessage: (message: object) => void;
+    abort: { cancelled: boolean };
+}) {
+    const { elementData, rendererState, clientContext, sendMessage, abort } = args;
+    const state = resolveWebframeState(elementData, rendererState);
+    const visitorContext = await resolveVisitorContext(clientContext);
+
+    if (abort.cancelled) {
+        return;
+    }
+
+    if (typeof visitorContext !== 'undefined') {
+        Object.assign(state, visitorContext);
+    }
+
+    if (Object.keys(state).length > 0) {
+        sendMessage({ state });
+    }
+}
diff --git a/packages/react-contentkit/src/client.ts b/packages/react-contentkit/src/client.ts
new file mode 100644
index 0000000000..a68102eddd
--- /dev/null
+++ b/packages/react-contentkit/src/client.ts
@@ -0,0 +1,5 @@
+'use client';
+
+// Client-safe entrypoint: avoid pulling server rendering exports into Client Components.
+export { ContentKit } from './ContentKit';
+export type { ContentKitClientContextData } from './context';
diff --git a/packages/react-contentkit/src/context.ts b/packages/react-contentkit/src/context.ts
index ee28808b8b..c1dadf5dc5 100644
--- a/packages/react-contentkit/src/context.ts
+++ b/packages/react-contentkit/src/context.ts
@@ -17,9 +17,23 @@ export type ContentKitRenderUpdate = Partial<
     Pick<RequestRenderIntegrationUI, 'action' | 'props' | 'state'>
 >;
 
+export type ContentKitClientContextData = {
+    getVisitorContext?: () =>
+        | Record<string, unknown>
+        | null
+        | undefined
+        | Promise<Record<string, unknown> | null | undefined>;
+};
+
 export interface ContentKitClientContextType {
     security: ContentKitSecurity;
 
+    /**
+     * Client-only contextual data for client-rendered elements such as webframes.
+     * This data must not be included in integration render requests.
+     */
+    clientContext?: ContentKitClientContextData;
+
     /**
      * Current value of the state.
      */
diff --git a/packages/react-contentkit/src/index.ts b/packages/react-contentkit/src/index.ts
index b9bb05faf8..b5844cffc3 100644
--- a/packages/react-contentkit/src/index.ts
+++ b/packages/react-contentkit/src/index.ts
@@ -1,3 +1,4 @@
 export * from './ContentKit';
 export * from './ContentKitOutput';
+export type { ContentKitClientContextData } from './context';
 export type { ContentKitServerContext } from './types';
diff --git a/packages/react-contentkit/tsdown.config.ts b/packages/react-contentkit/tsdown.config.ts
index b9cb6f83a2..db2fcfafcb 100644
--- a/packages/react-contentkit/tsdown.config.ts
+++ b/packages/react-contentkit/tsdown.config.ts
@@ -2,7 +2,7 @@ import { defineConfig } from 'tsdown';
 
 export default defineConfig([
     {
-        entry: 'src/index.ts',
+        entry: ['src/index.ts', 'src/client.ts'],
         unbundle: true,
     },
 ]);