simstudioai · waleedlatif1 · Jul 12, 2026 · Jul 12, 2026 · Jul 13, 2026 · Jul 13, 2026
diff --git a/apps/docs/app/[lang]/[[...slug]]/page.tsx b/apps/docs/app/[lang]/[[...slug]]/page.tsx
@@ -39,6 +39,21 @@ function resolveLangAndSlug(params: { slug?: string[]; lang: string }) {
   return { lang, slug }
 }
 
+/**
+ * Strips a leading `/{lang}` path segment from a page URL. Unlike a naive
+ * `String.replace`, this only removes the locale when it is actually the
+ * first path segment — a plain substring replace would also match `/en`
+ * inside unrelated slugs (e.g. `/platform/enterprise`, `/integrations/enrich`,
+ * `/platform/self-hosting/environment-variables`), corrupting canonical and
+ * hreflang URLs for those pages.
+ */
+function stripLocalePrefix(url: string, lang: string): string {
+  const prefix = `/${lang}`
+  if (url === prefix) return ''
+  if (url.startsWith(`${prefix}/`)) return url.slice(prefix.length)
+  return url
+}
+
 const APIPage = createAPIPage(openapi, {
   playground: { enabled: false },
   content: {
@@ -342,13 +357,13 @@ export async function generateMetadata(props: {
     alternates: {
       canonical: fullUrl,
       languages: {
-        'x-default': `${BASE_URL}${page.url.replace(`/${lang}`, '')}`,
-        en: `${BASE_URL}${page.url.replace(`/${lang}`, '')}`,
-        es: `${BASE_URL}/es${page.url.replace(`/${lang}`, '')}`,
-        fr: `${BASE_URL}/fr${page.url.replace(`/${lang}`, '')}`,
-        de: `${BASE_URL}/de${page.url.replace(`/${lang}`, '')}`,
-        ja: `${BASE_URL}/ja${page.url.replace(`/${lang}`, '')}`,
-        zh: `${BASE_URL}/zh${page.url.replace(`/${lang}`, '')}`,
+        'x-default': `${BASE_URL}${stripLocalePrefix(page.url, lang)}`,
+        en: `${BASE_URL}${stripLocalePrefix(page.url, lang)}`,
+        es: `${BASE_URL}/es${stripLocalePrefix(page.url, lang)}`,
+        fr: `${BASE_URL}/fr${stripLocalePrefix(page.url, lang)}`,
+        de: `${BASE_URL}/de${stripLocalePrefix(page.url, lang)}`,
+        ja: `${BASE_URL}/ja${stripLocalePrefix(page.url, lang)}`,
+        zh: `${BASE_URL}/zh${stripLocalePrefix(page.url, lang)}`,
       },
     },
   }

diff --git a/apps/docs/app/[lang]/layout.tsx b/apps/docs/app/[lang]/layout.tsx
@@ -110,6 +110,7 @@ export default async function Layout({ children, params }: LayoutProps) {
               collapsible: false,
               footer: null,
               banner: null,
+              prefetch: false,
               components: {
                 Item: SidebarItem,
                 Folder: SidebarFolder,

diff --git a/apps/docs/components/ai/ask-ai-panel.tsx b/apps/docs/components/ai/ask-ai-panel.tsx
@@ -0,0 +1,234 @@
+'use client'
+
+import { type FormEvent, useEffect, useMemo, useRef, useState } from 'react'
+import { useChat } from '@ai-sdk/react'
+import { DefaultChatTransport } from 'ai'
+import { ArrowUp, MessageCircle, Square, X } from 'lucide-react'
+import { Streamdown } from 'streamdown'
+import { cn } from '@/lib/utils'
+import 'streamdown/styles.css'
+
+interface DocSource {
+  title: string
+  url: string
+}
+
+/** Pull the deduped doc sources surfaced by the searchDocs tool out of a message's parts. */
+function getSources(parts: ReadonlyArray<{ type: string; [key: string]: unknown }>): DocSource[] {
+  const seen = new Set<string>()
+  const sources: DocSource[] = []
+
+  for (const part of parts) {
+    if (part.type !== 'tool-searchDocs') continue
+    const output = (part as { output?: unknown }).output
+    if (!Array.isArray(output)) continue
+    for (const item of output as DocSource[]) {
+      if (!item?.url || seen.has(item.url)) continue
+      seen.add(item.url)
+      sources.push({ title: item.title, url: item.url })
+    }
+  }
+
+  return sources
+}
+
+/** Concatenate the streamed text parts of a message. */
+function getText(parts: ReadonlyArray<{ type: string; [key: string]: unknown }>): string {
+  return parts
+    .filter((part) => part.type === 'text')
+    .map((part) => (part as unknown as { text: string }).text)
+    .join('')
+}
+
+interface AskAIPanelProps {
+  /** Active docs locale, forwarded so retrieval is scoped to the reader's language. */
+  locale: string
+  open: boolean
+  onClose: () => void
+}
+
+export function AskAIPanel({ locale, open, onClose }: AskAIPanelProps) {
+  const [input, setInput] = useState('')
+  const scrollRef = useRef<HTMLDivElement>(null)
+  const textareaRef = useRef<HTMLTextAreaElement>(null)
+
+  const transport = useMemo(() => new DefaultChatTransport({ api: '/api/chat' }), [])
+
+  const { messages, sendMessage, status, stop, error } = useChat({ transport })
+
+  const isBusy = status === 'submitted' || status === 'streaming'
+
+  const handleClose = () => {
+    stop()
+    onClose()
+  }
+
+  useEffect(() => {
+    if (!open) return
+    textareaRef.current?.focus()
+    const handleKeyDown = (event: KeyboardEvent) => {
+      if (event.key === 'Escape') {
+        handleClose()
+      }
+    }
+    document.addEventListener('keydown', handleKeyDown)
+    return () => document.removeEventListener('keydown', handleKeyDown)
+  }, [open])
+
+  useEffect(() => {
+    if (!open) return
+    scrollRef.current?.scrollTo({ top: scrollRef.current.scrollHeight })
+  }, [open])
+
+  useEffect(() => {
+    scrollRef.current?.scrollTo({ top: scrollRef.current.scrollHeight, behavior: 'smooth' })
+  }, [messages])
+
+  const handleSubmit = (event: FormEvent) => {
+    event.preventDefault()
+    const text = input.trim()
+    if (!text || isBusy) return
+    sendMessage({ text }, { body: { locale } })
+    setInput('')
+  }
+
+  if (!open) return null
+
+  return (
+    <div
+      role='dialog'
+      aria-label='Ask Sim'
+      className='fixed right-4 bottom-4 z-50 flex h-[600px] max-h-[calc(100vh-2rem)] w-[400px] max-w-[calc(100vw-2rem)] flex-col overflow-hidden rounded-xl border border-[var(--border-1)] bg-[var(--surface-5)] shadow-[var(--shadow-medium)] dark:bg-[var(--surface-4)]'
+    >
+      <div className='flex items-center justify-between border-[var(--border-1)] border-b px-4 py-3'>
+        <span className='flex items-center gap-1.5 font-season text-[var(--text-body)] text-sm'>
+          <MessageCircle className='size-[16px] text-[var(--text-icon)]' />
+          Ask Sim
+        </span>
+        <button
+          type='button'
+          aria-label='Close'
+          onClick={handleClose}
+          className='flex size-7 items-center justify-center rounded-lg text-[var(--text-icon)] transition-colors hover:bg-[var(--surface-active)]'
+        >
+          <X className='size-[16px]' />
+        </button>
+      </div>
+
+      <div ref={scrollRef} className='flex-1 space-y-4 overflow-y-auto px-4 py-4'>
+        {messages.length === 0 && (
+          <p className='text-[var(--text-muted)] text-sm'>
+            Ask anything about building, deploying, and managing AI agents in Sim.
+          </p>
+        )}
+
+        {messages.map((message, index) => {
+          const text = getText(message.parts)
+          const isStreaming = isBusy && index === messages.length - 1
+          const sources = message.role === 'assistant' ? getSources(message.parts) : []
+          return (
+            <div
+              key={message.id}
+              className={cn(
+                'flex flex-col gap-1.5',
+                message.role === 'user' ? 'items-end' : 'items-start'
+              )}
+            >
+              {message.role === 'user' ? (
+                <div className='max-w-[85%] whitespace-pre-wrap rounded-[16px] bg-[var(--surface-5)] px-3 py-2 text-[var(--text-primary)] text-base leading-[23px]'>
+                  {text}
+                </div>
+              ) : (
+                <div className='max-w-full text-[var(--text-primary)] text-base'>
+                  {text ? (
+                    <Streamdown
+                      className={cn(
+                        'space-y-3 text-[var(--text-primary)] text-base leading-relaxed',
+                        '[&_a]:text-[var(--text-primary)] [&_a]:underline [&_a]:decoration-dashed [&_a]:underline-offset-4',
+                        '[&_strong]:font-[600]',
+                        '[&_h1]:font-[600] [&_h2]:font-[600] [&_h3]:font-[600] [&_h4]:font-[600]',
+                        '[&_li]:my-1 [&_ol]:my-3 [&_ol]:list-decimal [&_ol]:pl-5 [&_ul]:my-3 [&_ul]:list-disc [&_ul]:pl-5',
+                        '[&_code]:font-mono [&_pre]:my-3 [&_pre]:overflow-x-auto [&_pre]:rounded-lg [&_pre]:bg-[var(--surface-5)] [&_pre]:p-3 [&_pre]:text-small'
+                      )}
+                    >
+                      {text}
+                    </Streamdown>
+                  ) : isStreaming ? (
+                    '…'
+                  ) : sources.length === 0 ? (
+                    <span className='text-[var(--text-muted)]'>No answer returned.</span>
+                  ) : null}
+                </div>
+              )}
+              {sources.length > 0 && (
+                <div className='flex max-w-[90%] flex-wrap gap-1.5'>
+                  {sources.map((source) => (
+                    <a
+                      key={source.url}
+                      href={source.url}
+                      target='_blank'
+                      rel='noopener noreferrer'
+                      className='rounded-lg border border-[var(--border-1)] px-2 py-0.5 text-[var(--text-muted)] text-xs transition-colors hover:bg-[var(--surface-active)]'
+                    >
+                      {source.title || source.url}
+                    </a>
+                  ))}
+                </div>
+              )}
+            </div>
+          )
+        })}
+
+        {error && (
+          <p className='text-[var(--text-muted)] text-sm'>
+            Something went wrong. Please try again.
+          </p>
+        )}
+      </div>
+
+      <form onSubmit={handleSubmit} className='px-3 pb-3'>
+        <div className='flex items-end gap-2 rounded-2xl border border-[var(--border-1)] bg-white px-2.5 py-1.5 dark:bg-[var(--surface-5)]'>
+          <textarea
+            ref={textareaRef}
+            aria-label='Ask Sim about the docs'
+            value={input}
+            onChange={(event) => setInput(event.target.value)}
+            onKeyDown={(event) => {
+              if (event.key === 'Enter' && !event.shiftKey) {
+                event.preventDefault()
+                handleSubmit(event)
+              }
+            }}
+            rows={1}
+            placeholder='Ask Sim about the docs…'
+            className='max-h-32 flex-1 resize-none bg-transparent py-1 font-season text-[var(--text-body)] text-sm outline-none placeholder:text-[var(--text-muted)]'
+          />
+          {isBusy ? (
+            <button
+              type='button'
+              aria-label='Stop'
+              onClick={() => stop()}
+              className='flex size-[28px] shrink-0 items-center justify-center rounded-full bg-[#383838] transition-colors hover:bg-[#575757] dark:bg-[#e0e0e0] dark:hover:bg-[#cfcfcf]'
+            >
+              <Square className='size-[12px] fill-white text-white dark:fill-black dark:text-black' />
+            </button>
+          ) : (
+            <button
+              type='submit'
+              aria-label='Send'
+              disabled={!input.trim()}
+              className={cn(
+                'flex size-[28px] shrink-0 items-center justify-center rounded-full transition-colors',
+                input.trim()
+                  ? 'bg-[#383838] hover:bg-[#575757] dark:bg-[#e0e0e0] dark:hover:bg-[#cfcfcf]'
+                  : 'bg-[#808080]'
+              )}
+            >
+              <ArrowUp className='size-[16px] text-white dark:text-black' />
+            </button>
+          )}
+        </div>
+      </form>
+    </div>
+  )
+}