feat(web): integrate AI Elements chat primitives

2026-07-23 17:41:16 +05:30
parent 3836d70704
commit 1d18ec1b32
19 changed files with 1987 additions and 175 deletions
--- a/apps/web/components.json
+++ b/apps/web/components.json
@@ -12,7 +12,7 @@
  },
  "iconLibrary": "lucide",
  "aliases": {
-    "components": "@/components",
+    "components": "@code/ui/components",
    "utils": "@code/ui/lib/utils",
    "ui": "@code/ui/components",
    "lib": "@/lib",
--- a/apps/web/src/components/chat/chat-conversation.tsx
+++ b/apps/web/src/components/chat/chat-conversation.tsx
@@ -1,14 +1,5 @@
+import { ConversationEmptyState } from "@code/ui/components/ai-elements/conversation";
 import { Button } from "@code/ui/components/button";
-import {
-  Empty,
-  EmptyContent,
-  EmptyDescription,
-  EmptyHeader,
-  EmptyMedia,
-  EmptyTitle,
-} from "@code/ui/components/empty";
-import { MessageGroup } from "@code/ui/components/message";
-import { MessageScrollerItem } from "@code/ui/components/message-scroller";
 import { MobileChatMark } from "@code/ui/components/mobile-chat";

 import { SUGGESTIONS } from "@/lib/chat/constants";
@@ -25,19 +16,17 @@ export const ChatConversation = ({
 }: ChatConversationProps) => {
  if (historyReady && messages.length === 0) {
    return (
-      <Empty className="min-h-full items-start justify-end px-0 pt-14 pb-5">
-        <EmptyMedia className="size-10 bg-transparent" variant="icon">
-          <MobileChatMark className="size-10 rounded-[12px] [&_svg]:size-5" />
-        </EmptyMedia>
-        <EmptyHeader className="items-start text-left">
-          <EmptyTitle className="text-[22px] font-semibold tracking-[-0.035em]">
+      <ConversationEmptyState className="min-h-full items-start justify-end px-0 pt-14 pb-5 text-left">
+        <MobileChatMark className="size-10 rounded-[12px] [&_svg]:size-5" />
+        <div className="space-y-1">
+          <h2 className="text-[22px] font-semibold tracking-[-0.035em]">
            What can I help with?
-          </EmptyTitle>
-          <EmptyDescription className="max-w-[320px] text-[14px] leading-5">
+          </h2>
+          <p className="max-w-[320px] text-[14px] leading-5 text-muted-foreground">
            Think, write, plan, or explore an idea with Zopu.
-          </EmptyDescription>
-        </EmptyHeader>
-        <EmptyContent className="mt-3 grid w-full gap-2">
+          </p>
+        </div>
+        <div className="mt-3 grid w-full gap-2">
          {SUGGESTIONS.map(([title, prompt]) => (
            <Button
              key={title}
@@ -51,27 +40,17 @@ export const ChatConversation = ({
              </span>
            </Button>
          ))}
-        </EmptyContent>
-      </Empty>
+        </div>
+      </ConversationEmptyState>
    );
  }

  return (
-    <MessageGroup className="gap-5 pb-5">
-      {messages.map((message, index) => (
-        <MessageScrollerItem
-          key={message.id}
-          messageId={message.id}
-          scrollAnchor={index === messages.length - 1}
-        >
-          <ChatMessage message={message} />
-        </MessageScrollerItem>
+    <div className="flex min-w-0 flex-col gap-5 pb-5">
+      {messages.map((message) => (
+        <ChatMessage key={message.id} message={message} />
      ))}
-      {status === "submitted" && (
-        <MessageScrollerItem scrollAnchor>
-          <ChatThinkingResponse />
-        </MessageScrollerItem>
-      )}
-    </MessageGroup>
+      {status === "submitted" && <ChatThinkingResponse />}
+    </div>
  );
 };
--- a/apps/web/src/components/chat/chat-message.tsx
+++ b/apps/web/src/components/chat/chat-message.tsx
@@ -1,9 +1,13 @@
+import {
+  Message,
+  MessageContent,
+  MessageResponse,
+} from "@code/ui/components/ai-elements/message";
 import {
  MobileChatBubble,
  MobileChatMessage,
 } from "@code/ui/components/mobile-chat";
 import type { ReactNode } from "react";
-import { Streamdown } from "streamdown";

 import { getMessageText, isMessageStreaming } from "@/lib/chat/transforms";
 import type { ChatMessageProps } from "@/lib/chat/types";
@@ -23,13 +27,13 @@ export const ChatMessage = ({ message }: ChatMessageProps) => {
  let content: ReactNode = text;
  if (!isUser) {
    content = text ? (
-      <Streamdown
+      <MessageResponse
        caret={isStreaming ? "block" : undefined}
        className="chat-markdown min-w-0"
        isAnimating={isStreaming}
      >
        {text}
-      </Streamdown>
+      </MessageResponse>
    ) : (
      <div className="thinking-line" aria-label="Zopu is preparing a response">
        <span />
@@ -42,23 +46,27 @@ export const ChatMessage = ({ message }: ChatMessageProps) => {
  const sender = isUser ? "user" : "assistant";

  return (
-    <MobileChatMessage className="chat-message" sender={sender}>
-      <div className={isUser ? "max-w-full" : "w-full min-w-0"}>
-        {!isUser && (
-          <AssistantIdentity state={isStreaming ? "writing" : undefined} />
-        )}
-        <MobileChatBubble
-          className={isUser ? "whitespace-pre-wrap" : undefined}
-          sender={sender}
-        >
-          {message.parts.map((part) =>
-            part.type === "dynamic-tool" ? (
-              <ChatToolCall key={part.toolCallId} part={part} />
-            ) : null
-          )}
-          {content}
-        </MobileChatBubble>
-      </div>
-    </MobileChatMessage>
+    <Message className="max-w-full gap-0" from={message.role}>
+      <MessageContent className="w-full max-w-none gap-0 overflow-visible rounded-none bg-transparent p-0 group-[.is-user]:rounded-none group-[.is-user]:bg-transparent group-[.is-user]:p-0">
+        <MobileChatMessage className="chat-message" sender={sender}>
+          <div className={isUser ? "max-w-full" : "w-full min-w-0"}>
+            {!isUser && (
+              <AssistantIdentity state={isStreaming ? "writing" : undefined} />
+            )}
+            <MobileChatBubble
+              className={isUser ? "whitespace-pre-wrap" : undefined}
+              sender={sender}
+            >
+              {message.parts.map((part) =>
+                part.type === "dynamic-tool" ? (
+                  <ChatToolCall key={part.toolCallId} part={part} />
+                ) : null
+              )}
+              {content}
+            </MobileChatBubble>
+          </div>
+        </MobileChatMessage>
+      </MessageContent>
+    </Message>
  );
 };
--- a/apps/web/src/components/chat/chat-page.tsx
+++ b/apps/web/src/components/chat/chat-page.tsx
@@ -1,10 +1,8 @@
 import {
-  MessageScroller,
-  MessageScrollerButton,
-  MessageScrollerContent,
-  MessageScrollerProvider,
-  MessageScrollerViewport,
-} from "@code/ui/components/message-scroller";
+  Conversation,
+  ConversationContent,
+  ConversationScrollButton,
+} from "@code/ui/components/ai-elements/conversation";

 import { useChatAgent } from "@/hooks/chat/use-chat-agent";

@@ -21,32 +19,20 @@ export const ChatPage = () => {
      <ChatHeader status={agent.status} />

      <main aria-label="Conversation" className="min-h-0 flex-1">
-        <MessageScrollerProvider
-          autoScroll
-          defaultScrollPosition="end"
-          scrollEdgeThreshold={72}
-          scrollMargin={18}
-        >
-          <MessageScroller>
-            <MessageScrollerViewport aria-label="Chat messages">
-              <MessageScrollerContent className="w-full px-4 pt-4 pb-6">
-                <ChatConversation
-                  historyReady={agent.historyReady}
-                  messages={agent.messages}
-                  onSuggestion={(suggestion) =>
-                    void handleSendMessage(suggestion)
-                  }
-                  status={agent.status}
-                />
-              </MessageScrollerContent>
-            </MessageScrollerViewport>
-            <MessageScrollerButton
-              aria-label="Scroll to latest message"
-              className="bottom-3 size-9 rounded-full border border-[#dededb] bg-[#fefefe]/95 shadow-sm backdrop-blur"
-              direction="end"
+        <Conversation className="ai-conversation-mobile h-full">
+          <ConversationContent className="min-h-full w-full gap-0 px-4 pt-4 pb-6">
+            <ChatConversation
+              historyReady={agent.historyReady}
+              messages={agent.messages}
+              onSuggestion={(suggestion) => void handleSendMessage(suggestion)}
+              status={agent.status}
            />
-          </MessageScroller>
-        </MessageScrollerProvider>
+          </ConversationContent>
+          <ConversationScrollButton
+            aria-label="Scroll to latest message"
+            className="bottom-3 size-9 rounded-full border border-[#dededb] bg-[#fefefe]/95 shadow-sm backdrop-blur"
+          />
+        </Conversation>
      </main>

      <ChatComposer
--- a/apps/web/src/components/chat/chat-thinking-response.tsx
+++ b/apps/web/src/components/chat/chat-thinking-response.tsx
@@ -1,3 +1,7 @@
+import {
+  Message,
+  MessageContent,
+} from "@code/ui/components/ai-elements/message";
 import {
  MobileChatBubble,
  MobileChatMessage,
@@ -6,16 +10,20 @@ import {
 import { AssistantIdentity } from "./assistant-identity";

 export const ChatThinkingResponse = () => (
-  <MobileChatMessage className="chat-message" sender="assistant">
-    <div className="w-full min-w-0">
-      <AssistantIdentity state="thinking" />
-      <MobileChatBubble sender="assistant">
-        <div className="thinking-line" aria-label="Zopu is thinking">
-          <span />
-          <span />
-          <span />
+  <Message className="max-w-full gap-0" from="assistant">
+    <MessageContent className="w-full max-w-none gap-0 overflow-visible p-0">
+      <MobileChatMessage className="chat-message" sender="assistant">
+        <div className="w-full min-w-0">
+          <AssistantIdentity state="thinking" />
+          <MobileChatBubble sender="assistant">
+            <div className="thinking-line" aria-label="Zopu is thinking">
+              <span />
+              <span />
+              <span />
+            </div>
+          </MobileChatBubble>
        </div>
-      </MobileChatBubble>
-    </div>
-  </MobileChatMessage>
+      </MobileChatMessage>
+    </MessageContent>
+  </Message>
 );
--- a/apps/web/src/components/chat/chat-tool-call.tsx
+++ b/apps/web/src/components/chat/chat-tool-call.tsx
@@ -1,3 +1,10 @@
+import {
+  Tool,
+  ToolContent,
+  ToolHeader,
+  ToolInput,
+  ToolOutput,
+} from "@code/ui/components/ai-elements/tool";
 import { MobileChatToolCall } from "@code/ui/components/mobile-chat";
 import { Search, SquareTerminal } from "lucide-react";

@@ -25,20 +32,36 @@ export const ChatToolCall = ({ part }: ChatToolCallProps) => {
  }

  const isSearch = part.toolName.toLowerCase().includes("search");
+  const output = part.state === "output-available" ? part.output : undefined;
+  const errorText = part.state === "output-error" ? part.errorText : undefined;

  return (
-    <MobileChatToolCall
-      detail={detail}
-      icon={
-        isSearch ? (
-          <Search className="size-3" strokeWidth={2.2} />
-        ) : (
-          <SquareTerminal className="size-3" strokeWidth={2.2} />
-        )
-      }
-      status={status}
-      tone={tone}
-      toolName={part.toolName}
-    />
+    <Tool className="mb-0 w-full border-0" defaultOpen>
+      <ToolHeader
+        className="sr-only"
+        state={part.state}
+        toolName={part.toolName}
+        type="dynamic-tool"
+      />
+      <ToolContent className="space-y-0 p-0">
+        <MobileChatToolCall
+          detail={detail}
+          icon={
+            isSearch ? (
+              <Search className="size-3" strokeWidth={2.2} />
+            ) : (
+              <SquareTerminal className="size-3" strokeWidth={2.2} />
+            )
+          }
+          status={status}
+          tone={tone}
+          toolName={part.toolName}
+        />
+        <div className="sr-only">
+          <ToolInput input={part.input} />
+          <ToolOutput errorText={errorText} output={output} />
+        </div>
+      </ToolContent>
+    </Tool>
  );
 };
--- a/apps/web/src/index.css
+++ b/apps/web/src/index.css
@@ -7,6 +7,10 @@ body {
  overflow: hidden;
 }

+.ai-conversation-mobile > div {
+  scrollbar-gutter: auto !important;
+}
+
 .chat-message {
  animation: chat-message-enter 220ms cubic-bezier(0.22, 1, 0.36, 1) both;
 }
--- a/apps/web/src/routes/design.mobile-chat.tsx
+++ b/apps/web/src/routes/design.mobile-chat.tsx
@@ -1,3 +1,16 @@
+import {
+  Conversation,
+  ConversationContent,
+} from "@code/ui/components/ai-elements/conversation";
+import {
+  Message,
+  MessageContent,
+} from "@code/ui/components/ai-elements/message";
+import {
+  Tool,
+  ToolContent,
+  ToolHeader,
+} from "@code/ui/components/ai-elements/tool";
 import {
  MobileChatAssistantLabel,
  MobileChatBubble,
@@ -21,39 +34,59 @@ export const meta = (_args: Route.MetaArgs) => [
 const MobileChatShowcase = () => (
  <section className="flex h-full min-h-0 flex-col bg-[#fefefe]">
    <MobileChatHeader active statusLabel="Ready" />
-    <main className="min-h-0 flex-1 overflow-y-auto px-4 pt-4 pb-6">
-      <MobileChatMessage sender="user">
-        <MobileChatBubble sender="user">
-          Summarize Q3 and find recent AI news.
-        </MobileChatBubble>
-      </MobileChatMessage>
+    <Conversation className="ai-conversation-mobile min-h-0 flex-1">
+      <ConversationContent className="min-h-full w-full gap-0 px-4 pt-4 pb-6">
+        <Message className="max-w-full gap-0" from="user">
+          <MessageContent className="w-full max-w-none gap-0 overflow-visible rounded-none bg-transparent p-0 group-[.is-user]:rounded-none group-[.is-user]:bg-transparent group-[.is-user]:p-0">
+            <MobileChatMessage sender="user">
+              <MobileChatBubble sender="user">
+                Summarize Q3 and find recent AI news.
+              </MobileChatBubble>
+            </MobileChatMessage>
+          </MessageContent>
+        </Message>

-      <MobileChatMessage className="mt-5" sender="assistant">
-        <div className="w-full min-w-0">
-          <MobileChatAssistantLabel />
-          <MobileChatBubble sender="assistant">
-            <MobileChatToolCall
-              status="done"
-              tone="success"
-              toolName="Web Search"
-            >
-              <MobileChatToolResult
-                source="news.ycombinator.com"
-                title="AI funding hits record highs in 2026"
-              />
-              <MobileChatToolResult
-                source="news.ycombinator.com"
-                title="Show HN: Series B raised for new AI lab"
-              />
-            </MobileChatToolCall>
-            <p>
-              Revenue grew 18% QoQ to $4.2M. Top risks: customer concentration,
-              sales cycles, and infra costs.
-            </p>
-          </MobileChatBubble>
-        </div>
-      </MobileChatMessage>
-    </main>
+        <Message className="mt-5 max-w-full gap-0" from="assistant">
+          <MessageContent className="w-full max-w-none gap-0 overflow-visible p-0">
+            <MobileChatMessage sender="assistant">
+              <div className="w-full min-w-0">
+                <MobileChatAssistantLabel />
+                <MobileChatBubble sender="assistant">
+                  <Tool className="mb-0 w-full border-0" defaultOpen>
+                    <ToolHeader
+                      className="sr-only"
+                      state="output-available"
+                      toolName="Web Search"
+                      type="dynamic-tool"
+                    />
+                    <ToolContent className="space-y-0 p-0">
+                      <MobileChatToolCall
+                        status="done"
+                        tone="success"
+                        toolName="Web Search"
+                      >
+                        <MobileChatToolResult
+                          source="news.ycombinator.com"
+                          title="AI funding hits record highs in 2026"
+                        />
+                        <MobileChatToolResult
+                          source="news.ycombinator.com"
+                          title="Show HN: Series B raised for new AI lab"
+                        />
+                      </MobileChatToolCall>
+                    </ToolContent>
+                  </Tool>
+                  <p>
+                    Revenue grew 18% QoQ to $4.2M. Top risks: customer
+                    concentration, sales cycles, and infra costs.
+                  </p>
+                </MobileChatBubble>
+              </div>
+            </MobileChatMessage>
+          </MessageContent>
+        </Message>
+      </ConversationContent>
+    </Conversation>

    <MobileChatComposer
      canSend
--- a/bun.lock
+++ b/bun.lock
@@ -238,6 +238,11 @@
      "dependencies": {
        "@base-ui/react": "^1.6.0",
        "@shadcn/react": "^0.2.0",
+        "@streamdown/cjk": "^1.0.3",
+        "@streamdown/code": "^1.1.1",
+        "@streamdown/math": "^1.0.2",
+        "@streamdown/mermaid": "^1.0.2",
+        "ai": "^7.0.35",
        "class-variance-authority": "^0.7.1",
        "clsx": "^2.1.1",
        "lucide-react": "catalog:",
@@ -245,9 +250,12 @@
        "react": "^19.2.7",
        "react-dom": "^19.2.7",
        "shadcn": "^4.12.0",
+        "shiki": "^4.3.1",
        "sonner": "catalog:",
+        "streamdown": "^2.5.0",
        "tailwind-merge": "catalog:",
        "tw-animate-css": "^1.4.0",
+        "use-stick-to-bottom": "^1.1.6",
      },
      "devDependencies": {
        "@code/config": "workspace:*",
@@ -310,6 +318,12 @@

    "@agentos-software/tar": ["@agentos-software/tar@0.3.4", "", {}, "sha512-/SSqfgS5xOufvulsz5kVDTCFxpDy+5s7Og1iJe9krjU7Jvtgnp9TpPaJnSr721h6uY6tsWHcs3u8E457EwSkNw=="],

+    "@ai-sdk/gateway": ["@ai-sdk/gateway@4.0.27", "", { "dependencies": { "@ai-sdk/provider": "4.0.3", "@ai-sdk/provider-utils": "5.0.12", "@vercel/oidc": "3.2.0" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-gqTMvV0N8/JirIZ3OzwjSZRYxzwZu/PeOFCKb8NB9fstWH39tI+L6CkeMNVou5/HCKEYAw6RCOHW59Vhquv8vA=="],
+
+    "@ai-sdk/provider": ["@ai-sdk/provider@4.0.3", "", { "dependencies": { "json-schema": "^0.4.0" } }, "sha512-e0CpNWJUY7OxAFAnCZkw+ri9QOHWwTs1tXP42782KFGCU07qt8NiXCrCVowyCB5dP2r5/Uls+g2oPd8kOJn9dw=="],
+
+    "@ai-sdk/provider-utils": ["@ai-sdk/provider-utils@5.0.12", "", { "dependencies": { "@ai-sdk/provider": "4.0.3", "@standard-schema/spec": "^1.1.0", "@workflow/serde": "4.1.0", "eventsource-parser": "^3.0.8" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-bbhlOgHeYwrIGheLkM6fhS8hVger8uFPmcOLg+kxc9EFh7y30XYorWhthlYAgpadO3SJhFZrIcEknN7qEqEVvA=="],
+
    "@alloc/quick-lru": ["@alloc/quick-lru@5.2.0", "", {}, "sha512-UrcABB+4bUrFABwbluTIBErXwvbsU/V7TZWfmbgJfbkwiBuziS9gxdODUyuiecfdGQ85jglMW6juS3+z5TsKLw=="],

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@@ -1326,6 +1340,22 @@

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+    "@shikijs/core": ["@shikijs/core@4.3.1", "", { "dependencies": { "@shikijs/primitive": "4.3.1", "@shikijs/types": "4.3.1", "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4", "hast-util-to-html": "^9.0.5" } }, "sha512-ANMDxuaPsNMdDC1m4vfvhlDmJweMwkE5XitTwrq2rWHx5jM+dlm4MmHt2PP6t0uejfR77SuhrhJ0zEijIF/uhA=="],
+
+    "@shikijs/engine-javascript": ["@shikijs/engine-javascript@4.3.1", "", { "dependencies": { "@shikijs/types": "4.3.1", "@shikijs/vscode-textmate": "^10.0.2", "oniguruma-to-es": "^4.3.6" } }, "sha512-JBItcnPuYq7jVJdZo/vMj94r+szT7XEjHFX+mvFDGSEIbVAXAGyHAHzhbWzpGOwYidCZrErJLLgn2PVeiokHnQ=="],
+
+    "@shikijs/engine-oniguruma": ["@shikijs/engine-oniguruma@4.3.1", "", { "dependencies": { "@shikijs/types": "4.3.1", "@shikijs/vscode-textmate": "^10.0.2" } }, "sha512-OXyNMzg0pews+msMj4cHeqT4xiYKKvbnn6VbdAXxfoFl3SSx4fJTc8FadECuc5/H9p3BzhNAoAUXKwAu9rWYhg=="],
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+
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@@ -1598,6 +1638,8 @@

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@@ -1634,6 +1676,8 @@

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@@ -1650,6 +1694,8 @@

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+    "hast-util-to-text": ["hast-util-to-text@4.0.2", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "hast-util-is-element": "^3.0.0", "unist-util-find-after": "^5.0.0" } }, "sha512-KK6y/BN8lbaq654j7JgBydev7wuNMcID54lkRav1P0CaE1e47P72AWWPiGKXTJU271ooYzcvTAn/Zt0REnvc7A=="],
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@@ -2592,6 +2650,8 @@

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@@ -2698,7 +2758,7 @@

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+    "marked": ["marked@17.0.6", "", { "bin": { "marked": "bin/marked.js" } }, "sha512-gB0gkNafnonOw0obSTEGZTT86IuhILt2Wfx0mWH/1Au83kybTayroZ/V6nS25mN7u8ASy+5fMhgB3XPNrOZdmA=="],

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    "unist-util-position": ["unist-util-position@5.0.0", "", { "dependencies": { "@types/unist": "^3.0.0" } }, "sha512-fucsC7HjXvkB5R3kTCO7kUjRdrS0BJt3M/FPxmHMBOm8JQi2BsHAHFsy27E0EolP8rp0NzXsJ+jNPyDWvOJZPA=="],

+    "unist-util-remove-position": ["unist-util-remove-position@5.0.0", "", { "dependencies": { "@types/unist": "^3.0.0", "unist-util-visit": "^5.0.0" } }, "sha512-Hp5Kh3wLxv0PHj9m2yZhhLt58KzPtEYKQQ4yxfYFEO7EvHwzyDYnduhHnY1mDxoqr7VUwVuHXk9RXKIiYS1N8Q=="],
+
    "unist-util-stringify-position": ["unist-util-stringify-position@4.0.0", "", { "dependencies": { "@types/unist": "^3.0.0" } }, "sha512-0ASV06AAoKCDkS2+xw5RXJywruurpbC4JZSm7nr7MOt1ojAzvyyaO+UxZf18j8FCF6kmzCZKcAgN/yu2gm2XgQ=="],

    "unist-util-visit": ["unist-util-visit@5.1.0", "", { "dependencies": { "@types/unist": "^3.0.0", "unist-util-is": "^6.0.0", "unist-util-visit-parents": "^6.0.0" } }, "sha512-m+vIdyeCOpdr/QeQCu2EzxX/ohgS8KbnPDgFni4dQsfSCtpz8UqDyY5GjRru8PDKuYn7Fq19j1CQ+nJSsGKOzg=="],
@@ -3636,6 +3734,8 @@

    "use-sidecar": ["use-sidecar@1.1.3", "", { "dependencies": { "detect-node-es": "^1.1.0", "tslib": "^2.0.0" }, "peerDependencies": { "@types/react": "*", "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc" }, "optionalPeers": ["@types/react"] }, "sha512-Fedw0aZvkhynoPYlA5WXrMCAMm+nSWdZt6lzJQ7Ok8S6Q+VsHmHpRWndVRJ8Be0ZbkfPc5LRYH+5XrzXcEeLRQ=="],

+    "use-stick-to-bottom": ["use-stick-to-bottom@1.1.6", "", { "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-z3Up8jYQGTkUCsGBnwg6/wj70KgXoW5Kz1AAc1j8MtQuYMBo6ZsdhrIXoegxa7gaMMilgQYyTohTrt3p94jHog=="],
+
    "use-sync-external-store": ["use-sync-external-store@1.6.0", "", { "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w=="],

    "util": ["util@0.12.5", "", { "dependencies": { "inherits": "^2.0.3", "is-arguments": "^1.0.4", "is-generator-function": "^1.0.7", "is-typed-array": "^1.1.3", "which-typed-array": "^1.1.2" } }, "sha512-kZf/K6hEIrWHI6XqOFUiiMa+79wE/D8Q+NCNAWclkyg3b4d2k7s0QGepNjiABc+aR3N1PAyHL7p6UcLY6LmrnA=="],
@@ -3864,6 +3964,8 @@

    "@opentui/core/diff": ["diff@9.0.0", "", {}, "sha512-svtcdpS8CgJyqAjEQIXdb3OjhFVVYjzGAPO8WGCmRbrml64SPw/jJD4GoE98aR7r25A0XcgrK3F02yw9R/vhQw=="],

+    "@opentui/core/marked": ["marked@17.0.1", "", { "bin": { "marked": "bin/marked.js" } }, "sha512-boeBdiS0ghpWcSwoNm/jJBwdpFaMnZWRzjA6SkUMYb40SVaN1x7mmfGKp0jvexGcx+7y2La5zRZsYFZI6Qpypg=="],
+
    "@react-native/dev-middleware/open": ["open@7.4.2", "", { "dependencies": { "is-docker": "^2.0.0", "is-wsl": "^2.1.1" } }, "sha512-MVHddDVweXZF3awtlAS+6pgKLlm/JgxZ90+/NBurBoQctVOOB/zDdVjcyPzQ+0laDGbsWgrRkflI65sQeOgT9Q=="],

    "@react-native/dev-middleware/serve-static": ["serve-static@1.16.3", "", { "dependencies": { "encodeurl": "~2.0.0", "escape-html": "~1.0.3", "parseurl": "~1.3.3", "send": "~0.19.1" } }, "sha512-x0RTqQel6g5SY7Lg6ZreMmsOzncHFU7nhnRWkKgWuMTu5NN0DR5oruckMqRvacAN9d5w6ARnRBXl9xhDCgfMeA=="],
@@ -3886,6 +3988,8 @@

    "@secure-exec/nodejs/esbuild": ["esbuild@0.27.7", "", { "optionalDependencies": { "@esbuild/aix-ppc64": "0.27.7", "@esbuild/android-arm": "0.27.7", "@esbuild/android-arm64": "0.27.7", "@esbuild/android-x64": "0.27.7", "@esbuild/darwin-arm64": "0.27.7", "@esbuild/darwin-x64": "0.27.7", "@esbuild/freebsd-arm64": "0.27.7", "@esbuild/freebsd-x64": "0.27.7", "@esbuild/linux-arm": "0.27.7", "@esbuild/linux-arm64": "0.27.7", "@esbuild/linux-ia32": "0.27.7", "@esbuild/linux-loong64": "0.27.7", "@esbuild/linux-mips64el": "0.27.7", "@esbuild/linux-ppc64": "0.27.7", "@esbuild/linux-riscv64": "0.27.7", "@esbuild/linux-s390x": "0.27.7", "@esbuild/linux-x64": "0.27.7", "@esbuild/netbsd-arm64": "0.27.7", "@esbuild/netbsd-x64": "0.27.7", "@esbuild/openbsd-arm64": "0.27.7", "@esbuild/openbsd-x64": "0.27.7", "@esbuild/openharmony-arm64": "0.27.7", "@esbuild/sunos-x64": "0.27.7", "@esbuild/win32-arm64": "0.27.7", "@esbuild/win32-ia32": "0.27.7", "@esbuild/win32-x64": "0.27.7" }, "bin": { "esbuild": "bin/esbuild" } }, "sha512-IxpibTjyVnmrIQo5aqNpCgoACA/dTKLTlhMHihVHhdkxKyPO1uBBthumT0rdHmcsk9uMonIWS0m4FljWzILh3w=="],

+    "@streamdown/code/shiki": ["shiki@3.23.0", "", { "dependencies": { "@shikijs/core": "3.23.0", "@shikijs/engine-javascript": "3.23.0", "@shikijs/engine-oniguruma": "3.23.0", "@shikijs/langs": "3.23.0", "@shikijs/themes": "3.23.0", "@shikijs/types": "3.23.0", "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4" } }, "sha512-55Dj73uq9ZXL5zyeRPzHQsK7Nbyt6Y10k5s7OjuFZGMhpp4r/rsLBH0o/0fstIzX1Lep9VxefWljK/SKCzygIA=="],
+
    "@tailwindcss/node/lightningcss": ["lightningcss@1.32.0", "", { "dependencies": { "detect-libc": "^2.0.3" }, "optionalDependencies": { "lightningcss-android-arm64": "1.32.0", "lightningcss-darwin-arm64": "1.32.0", "lightningcss-darwin-x64": "1.32.0", "lightningcss-freebsd-x64": "1.32.0", "lightningcss-linux-arm-gnueabihf": "1.32.0", "lightningcss-linux-arm64-gnu": "1.32.0", "lightningcss-linux-arm64-musl": "1.32.0", "lightningcss-linux-x64-gnu": "1.32.0", "lightningcss-linux-x64-musl": "1.32.0", "lightningcss-win32-arm64-msvc": "1.32.0", "lightningcss-win32-x64-msvc": "1.32.0" } }, "sha512-NXYBzinNrblfraPGyrbPoD19C1h9lfI/1mzgWYvXUTe414Gz/X1FD2XBZSZM7rRTrMA8JL3OtAaGifrIKhQ5yQ=="],

    "@tailwindcss/oxide-wasm32-wasi/@emnapi/core": ["@emnapi/core@1.11.1", "", { "dependencies": { "@emnapi/wasi-threads": "1.2.2", "tslib": "^2.4.0" }, "bundled": true }, "sha512-RSvbQmHzdKzNsLYa/wHrbc3KN4sYLKAdPZxqiM2HATqv/SBk2/ENSHpvXGaLOMcsAyz0poEGqkmmKYG3OWiJEQ=="],
@@ -3972,24 +4076,24 @@

    "d3/d3-hierarchy": ["d3-hierarchy@3.1.2", "", {}, "sha512-FX/9frcub54beBdugHjDCdikxThEqjnR93Qt7PvQTOHxyiNCAlvMrHhclk3cD5VeAaq9fxmfRp+CnWw9rEMBuA=="],

-    "d3/d3-path": ["d3-path@3.1.0", "", {}, "sha512-p3KP5HCf/bvjBSSKuXid6Zqijx7wIfNW+J/maPs+iwR35at5JCbLUT0LzF1cnjbCHWhqzQTIN2Jpe8pRebIEFQ=="],
-
    "d3/d3-shape": ["d3-shape@3.2.0", "", { "dependencies": { "d3-path": "^3.1.0" } }, "sha512-SaLBuwGm3MOViRq2ABk3eLoxwZELpH6zhl3FbAoJ7Vm1gofKx6El1Ib5z23NUEhF9AsGl7y+dzLe5Cw2AArGTA=="],

-    "d3-chord/d3-path": ["d3-path@3.1.0", "", {}, "sha512-p3KP5HCf/bvjBSSKuXid6Zqijx7wIfNW+J/maPs+iwR35at5JCbLUT0LzF1cnjbCHWhqzQTIN2Jpe8pRebIEFQ=="],
-
    "d3-dsv/commander": ["commander@7.2.0", "", {}, "sha512-QrWXB+ZQSVPmIWIhtEO9H+gwHaMGYiF5ChvoJ+K9ZGHG/sVsa6yiesAD1GC/x46sET00Xlwo1u49RVVVzvcSkw=="],

    "d3-dsv/iconv-lite": ["iconv-lite@0.6.3", "", { "dependencies": { "safer-buffer": ">= 2.1.2 < 3.0.0" } }, "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw=="],

    "d3-sankey/d3-array": ["d3-array@2.12.1", "", { "dependencies": { "internmap": "^1.0.0" } }, "sha512-B0ErZK/66mHtEsR1TkPEEkwdy+WDesimkM5gpZr5Dsg54BiTA5RXtYW5qTLIAcekaS9xfZrzBLF/OAkB3Qn1YQ=="],

+    "d3-shape/d3-path": ["d3-path@1.0.9", "", {}, "sha512-VLaYcn81dtHVTjEHd8B+pbe9yHWpXKZUC87PzoFmsFrJqgFwDe/qxfp5MlfsfM1V5E/iVt0MmEbWQ7FVIXh/bg=="],
+
    "defaults/clone": ["clone@1.0.4", "", {}, "sha512-JQHZ2QMW6l3aH/j6xCqQThY/9OH4D/9ls34cgkUBiEeocRTU04tHfKPBsUK1PqZCUQM7GiA0IIXJSuXHI64Kbg=="],

    "degenerator/ast-types": ["ast-types@0.13.4", "", { "dependencies": { "tslib": "^2.0.1" } }, "sha512-x1FCFnFifvYDDzTaLII71vG5uvDwgtmDTEVWAxrgeiR8VjMONcCXJx7E+USjDtHlwFmt9MysbqgF9b9Vjr6w+w=="],

    "diffie-hellman/bn.js": ["bn.js@4.12.5", "", {}, "sha512-3aRg6/JxfffFD+OlOjOFR3Vo79l39ooBTFucxx+MT3dhCtzn3EmiUPQo+6/OZuI2jbXi3YKgmiTFBgChQMwIRQ=="],

+    "dom-serializer/entities": ["entities@4.5.0", "", {}, "sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw=="],
+
    "dot-prop/is-obj": ["is-obj@2.0.0", "", {}, "sha512-drqDG3cbczxxEJRoOXcOjtdp1J/lyp1mNn0xaznRs8+muBhgQcrnbspox5X5fOw0HnMnbfDzvnEMEtqDEJEo8w=="],

    "elliptic/bn.js": ["bn.js@4.12.5", "", {}, "sha512-3aRg6/JxfffFD+OlOjOFR3Vo79l39ooBTFucxx+MT3dhCtzn3EmiUPQo+6/OZuI2jbXi3YKgmiTFBgChQMwIRQ=="],
@@ -4104,8 +4208,6 @@

    "parse-png/pngjs": ["pngjs@3.4.0", "", {}, "sha512-NCrCHhWmnQklfH4MtJMRjZ2a8c80qXeMlQMv2uVp9ISJMTt562SbGd6n2oq0PaPgKm7Z6pL9E2UlLIhC+SHL3w=="],

-    "parse5/entities": ["entities@6.0.1", "", {}, "sha512-aN97NXWF6AWBTahfVOIrB/NShkzi5H7F9r1s9mD3cDj4Ko5f2qhhVoYMibXF7GlLveb/D2ioWay8lxI97Ven3g=="],
-
    "parse5-htmlparser2-tree-adapter/parse5": ["parse5@6.0.1", "", {}, "sha512-Ofn/CTFzRGTTxwpNEs9PP93gXShHcTq255nzRYSKe8AkVpZY7e1fpmTfOyoIvjP5HG7Z2ZM7VS9PPhQGW2pOpw=="],

    "path-scurry/lru-cache": ["lru-cache@11.5.2", "", {}, "sha512-4pfM1Ff0x50o0tQwb5ucw/RzNyD0/YJME6IVcStalZuMWxdt3sR3huStTtxz4PUmvZfRguvDejasvQ2kifR11g=="],
@@ -4180,8 +4282,6 @@

    "stacktrace-parser/type-fest": ["type-fest@0.7.1", "", {}, "sha512-Ne2YiiGN8bmrmJJEuTWTLJR32nh/JdL1+PSicowtNb0WFpn59GK8/lfD61bVtzguz7b3PBt74nxpv/Pw5po5Rg=="],

-    "streamdown/marked": ["marked@17.0.6", "", { "bin": { "marked": "bin/marked.js" } }, "sha512-gB0gkNafnonOw0obSTEGZTT86IuhILt2Wfx0mWH/1Au83kybTayroZ/V6nS25mN7u8ASy+5fMhgB3XPNrOZdmA=="],
-
    "string-width/strip-ansi": ["strip-ansi@7.2.0", "", { "dependencies": { "ansi-regex": "^6.2.2" } }, "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w=="],

    "strip-ansi/ansi-regex": ["ansi-regex@6.2.2", "", {}, "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg=="],
@@ -4426,6 +4526,18 @@

    "@secure-exec/nodejs/esbuild/@esbuild/win32-x64": ["@esbuild/win32-x64@0.27.7", "", { "os": "win32", "cpu": "x64" }, "sha512-56hiAJPhwQ1R4i+21FVF7V8kSD5zZTdHcVuRFMW0hn753vVfQN8xlx4uOPT4xoGH0Z/oVATuR82AiqSTDIpaHg=="],

+    "@streamdown/code/shiki/@shikijs/core": ["@shikijs/core@3.23.0", "", { "dependencies": { "@shikijs/types": "3.23.0", "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4", "hast-util-to-html": "^9.0.5" } }, "sha512-NSWQz0riNb67xthdm5br6lAkvpDJRTgB36fxlo37ZzM2yq0PQFFzbd8psqC2XMPgCzo1fW6cVi18+ArJ44wqgA=="],
+
+    "@streamdown/code/shiki/@shikijs/engine-javascript": ["@shikijs/engine-javascript@3.23.0", "", { "dependencies": { "@shikijs/types": "3.23.0", "@shikijs/vscode-textmate": "^10.0.2", "oniguruma-to-es": "^4.3.4" } }, "sha512-aHt9eiGFobmWR5uqJUViySI1bHMqrAgamWE1TYSUoftkAeCCAiGawPMwM+VCadylQtF4V3VNOZ5LmfItH5f3yA=="],
+
+    "@streamdown/code/shiki/@shikijs/engine-oniguruma": ["@shikijs/engine-oniguruma@3.23.0", "", { "dependencies": { "@shikijs/types": "3.23.0", "@shikijs/vscode-textmate": "^10.0.2" } }, "sha512-1nWINwKXxKKLqPibT5f4pAFLej9oZzQTsby8942OTlsJzOBZ0MWKiwzMsd+jhzu8YPCHAswGnnN1YtQfirL35g=="],
+
+    "@streamdown/code/shiki/@shikijs/langs": ["@shikijs/langs@3.23.0", "", { "dependencies": { "@shikijs/types": "3.23.0" } }, "sha512-2Ep4W3Re5aB1/62RSYQInK9mM3HsLeB91cHqznAJMuylqjzNVAVCMnNWRHFtcNHXsoNRayP9z1qj4Sq3nMqYXg=="],
+
+    "@streamdown/code/shiki/@shikijs/themes": ["@shikijs/themes@3.23.0", "", { "dependencies": { "@shikijs/types": "3.23.0" } }, "sha512-5qySYa1ZgAT18HR/ypENL9cUSGOeI2x+4IvYJu4JgVJdizn6kG4ia5Q1jDEOi7gTbN4RbuYtmHh0W3eccOrjMA=="],
+
+    "@streamdown/code/shiki/@shikijs/types": ["@shikijs/types@3.23.0", "", { "dependencies": { "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4" } }, "sha512-3JZ5HXOZfYjsYSk0yPwBrkupyYSLpAE26Qc0HLghhZNGTZg/SKxXIIgoxOpmmeQP0RRSDJTk1/vPfw9tbw+jSQ=="],
+
    "@tailwindcss/node/lightningcss/lightningcss-android-arm64": ["lightningcss-android-arm64@1.32.0", "", { "os": "android", "cpu": "arm64" }, "sha512-YK7/ClTt4kAK0vo6w3X+Pnm0D2cf2vPHbhOXdoNti1Ga0al1P4TBZhwjATvjNwLEBCnKvjJc2jQgHXH0NEwlAg=="],

    "@tailwindcss/node/lightningcss/lightningcss-darwin-arm64": ["lightningcss-darwin-arm64@1.32.0", "", { "os": "darwin", "cpu": "arm64" }, "sha512-RzeG9Ju5bag2Bv1/lwlVJvBE3q6TtXskdZLLCyfg5pt+HLz9BqlICO7LZM7VHNTTn/5PRhHFBSjk5lc4cmscPQ=="],
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -16,6 +16,11 @@
  "dependencies": {
    "@base-ui/react": "^1.6.0",
    "@shadcn/react": "^0.2.0",
+    "@streamdown/cjk": "^1.0.3",
+    "@streamdown/code": "^1.1.1",
+    "@streamdown/math": "^1.0.2",
+    "@streamdown/mermaid": "^1.0.2",
+    "ai": "^7.0.35",
    "class-variance-authority": "^0.7.1",
    "clsx": "^2.1.1",
    "lucide-react": "catalog:",
@@ -23,9 +28,12 @@
    "react": "^19.2.7",
    "react-dom": "^19.2.7",
    "shadcn": "^4.12.0",
+    "shiki": "^4.3.1",
    "sonner": "catalog:",
+    "streamdown": "^2.5.0",
    "tailwind-merge": "catalog:",
-    "tw-animate-css": "^1.4.0"
+    "tw-animate-css": "^1.4.0",
+    "use-stick-to-bottom": "^1.1.6"
  },
  "devDependencies": {
    "@code/config": "workspace:*",
--- a/packages/ui/src/components/ai-elements/code-block.tsx
+++ b/packages/ui/src/components/ai-elements/code-block.tsx
@@ -0,0 +1,562 @@
+"use client";
+
+import { Button } from "@code/ui/components/button";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@code/ui/components/select";
+import { cn } from "@code/ui/lib/utils";
+import { CheckIcon, CopyIcon } from "lucide-react";
+import type { ComponentProps, CSSProperties, HTMLAttributes } from "react";
+import {
+  createContext,
+  memo,
+  useCallback,
+  useContext,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+} from "react";
+import type {
+  BundledLanguage,
+  BundledTheme,
+  HighlighterGeneric,
+  ThemedToken,
+} from "shiki";
+import { createHighlighter } from "shiki";
+
+// Shiki uses bitflags for font styles: 1=italic, 2=bold, 4=underline
+// oxlint-disable-next-line eslint(no-bitwise)
+const isItalic = (fontStyle: number | undefined) => fontStyle && fontStyle & 1;
+// oxlint-disable-next-line eslint(no-bitwise)
+const isBold = (fontStyle: number | undefined) => fontStyle && fontStyle & 2;
+const isUnderline = (fontStyle: number | undefined) =>
+  // oxlint-disable-next-line eslint(no-bitwise)
+  fontStyle && fontStyle & 4;
+
+// Transform tokens to include pre-computed keys to avoid noArrayIndexKey lint
+interface KeyedToken {
+  token: ThemedToken;
+  key: string;
+}
+interface KeyedLine {
+  tokens: KeyedToken[];
+  key: string;
+}
+
+const addKeysToTokens = (lines: ThemedToken[][]): KeyedLine[] =>
+  lines.map((line, lineIdx) => ({
+    key: `line-${lineIdx}`,
+    tokens: line.map((token, tokenIdx) => ({
+      key: `line-${lineIdx}-${tokenIdx}`,
+      token,
+    })),
+  }));
+
+// Token rendering component
+const TokenSpan = ({ token }: { token: ThemedToken }) => (
+  <span
+    className="dark:!bg-[var(--shiki-dark-bg)] dark:!text-[var(--shiki-dark)]"
+    style={
+      {
+        backgroundColor: token.bgColor,
+        color: token.color,
+        fontStyle: isItalic(token.fontStyle) ? "italic" : undefined,
+        fontWeight: isBold(token.fontStyle) ? "bold" : undefined,
+        textDecoration: isUnderline(token.fontStyle) ? "underline" : undefined,
+        ...token.htmlStyle,
+      } as CSSProperties
+    }
+  >
+    {token.content}
+  </span>
+);
+
+// Line number styles using CSS counters
+const LINE_NUMBER_CLASSES = cn(
+  "block",
+  "before:content-[counter(line)]",
+  "before:inline-block",
+  "before:[counter-increment:line]",
+  "before:w-8",
+  "before:mr-4",
+  "before:text-right",
+  "before:text-muted-foreground/50",
+  "before:font-mono",
+  "before:select-none"
+);
+
+// Line rendering component
+const LineSpan = ({
+  keyedLine,
+  showLineNumbers,
+}: {
+  keyedLine: KeyedLine;
+  showLineNumbers: boolean;
+}) => (
+  <span className={showLineNumbers ? LINE_NUMBER_CLASSES : "block"}>
+    {keyedLine.tokens.length === 0
+      ? "\n"
+      : keyedLine.tokens.map(({ token, key }) => (
+          <TokenSpan key={key} token={token} />
+        ))}
+  </span>
+);
+
+// Types
+type CodeBlockProps = HTMLAttributes<HTMLDivElement> & {
+  code: string;
+  language: BundledLanguage;
+  showLineNumbers?: boolean;
+};
+
+interface TokenizedCode {
+  tokens: ThemedToken[][];
+  fg: string;
+  bg: string;
+}
+
+interface CodeBlockContextType {
+  code: string;
+}
+
+// Context
+const CodeBlockContext = createContext<CodeBlockContextType>({
+  code: "",
+});
+
+// Highlighter cache (singleton per language)
+const highlighterCache = new Map<
+  string,
+  Promise<HighlighterGeneric<BundledLanguage, BundledTheme>>
+>();
+
+// Token cache
+const tokensCache = new Map<string, TokenizedCode>();
+
+// Subscribers for async token updates
+const subscribers = new Map<string, Set<(result: TokenizedCode) => void>>();
+
+const getTokensCacheKey = (code: string, language: BundledLanguage) => {
+  const start = code.slice(0, 100);
+  const end = code.length > 100 ? code.slice(-100) : "";
+  return `${language}:${code.length}:${start}:${end}`;
+};
+
+const getHighlighter = (
+  language: BundledLanguage
+): Promise<HighlighterGeneric<BundledLanguage, BundledTheme>> => {
+  const cached = highlighterCache.get(language);
+  if (cached) {
+    return cached;
+  }
+
+  const highlighterPromise = createHighlighter({
+    langs: [language],
+    themes: ["github-light", "github-dark"],
+  });
+
+  highlighterCache.set(language, highlighterPromise);
+  return highlighterPromise;
+};
+
+// Create raw tokens for immediate display while highlighting loads
+const createRawTokens = (code: string): TokenizedCode => ({
+  bg: "transparent",
+  fg: "inherit",
+  tokens: code.split("\n").map((line) =>
+    line === ""
+      ? []
+      : [
+          {
+            color: "inherit",
+            content: line,
+          } as ThemedToken,
+        ]
+  ),
+});
+
+// Synchronous highlight with callback for async results
+export const highlightCode = (
+  code: string,
+  language: BundledLanguage,
+  // oxlint-disable-next-line eslint-plugin-promise(prefer-await-to-callbacks)
+  callback?: (result: TokenizedCode) => void
+): TokenizedCode | null => {
+  const tokensCacheKey = getTokensCacheKey(code, language);
+
+  // Return cached result if available
+  const cached = tokensCache.get(tokensCacheKey);
+  if (cached) {
+    return cached;
+  }
+
+  // Subscribe callback if provided
+  if (callback) {
+    if (!subscribers.has(tokensCacheKey)) {
+      subscribers.set(tokensCacheKey, new Set());
+    }
+    subscribers.get(tokensCacheKey)?.add(callback);
+  }
+
+  // Start highlighting in background - fire-and-forget async pattern
+  getHighlighter(language)
+    // oxlint-disable-next-line eslint-plugin-promise(prefer-await-to-then)
+    .then((highlighter) => {
+      const availableLangs = highlighter.getLoadedLanguages();
+      const langToUse = availableLangs.includes(language) ? language : "text";
+
+      const result = highlighter.codeToTokens(code, {
+        lang: langToUse,
+        themes: {
+          dark: "github-dark",
+          light: "github-light",
+        },
+      });
+
+      const tokenized: TokenizedCode = {
+        bg: result.bg ?? "transparent",
+        fg: result.fg ?? "inherit",
+        tokens: result.tokens,
+      };
+
+      // Cache the result
+      tokensCache.set(tokensCacheKey, tokenized);
+
+      // Notify all subscribers
+      const subs = subscribers.get(tokensCacheKey);
+      if (subs) {
+        for (const sub of subs) {
+          sub(tokenized);
+        }
+        subscribers.delete(tokensCacheKey);
+      }
+    })
+    // oxlint-disable-next-line eslint-plugin-promise(prefer-await-to-then), eslint-plugin-promise(prefer-await-to-callbacks)
+    .catch((error) => {
+      console.error("Failed to highlight code:", error);
+      subscribers.delete(tokensCacheKey);
+    });
+
+  return null;
+};
+
+const CodeBlockBody = memo(
+  ({
+    tokenized,
+    showLineNumbers,
+    className,
+  }: {
+    tokenized: TokenizedCode;
+    showLineNumbers: boolean;
+    className?: string;
+  }) => {
+    const preStyle = useMemo(
+      () => ({
+        backgroundColor: tokenized.bg,
+        color: tokenized.fg,
+      }),
+      [tokenized.bg, tokenized.fg]
+    );
+
+    const keyedLines = useMemo(
+      () => addKeysToTokens(tokenized.tokens),
+      [tokenized.tokens]
+    );
+
+    return (
+      <pre
+        className={cn(
+          "dark:!bg-[var(--shiki-dark-bg)] dark:!text-[var(--shiki-dark)] m-0 p-4 text-sm",
+          className
+        )}
+        style={preStyle}
+      >
+        <code
+          className={cn(
+            "font-mono text-sm",
+            showLineNumbers && "[counter-increment:line_0] [counter-reset:line]"
+          )}
+        >
+          {keyedLines.map((keyedLine) => (
+            <LineSpan
+              key={keyedLine.key}
+              keyedLine={keyedLine}
+              showLineNumbers={showLineNumbers}
+            />
+          ))}
+        </code>
+      </pre>
+    );
+  },
+  (prevProps, nextProps) =>
+    prevProps.tokenized === nextProps.tokenized &&
+    prevProps.showLineNumbers === nextProps.showLineNumbers &&
+    prevProps.className === nextProps.className
+);
+
+CodeBlockBody.displayName = "CodeBlockBody";
+
+export const CodeBlockContainer = ({
+  className,
+  language,
+  style,
+  ...props
+}: HTMLAttributes<HTMLDivElement> & { language: string }) => (
+  <div
+    className={cn(
+      "group relative w-full overflow-hidden rounded-md border bg-background text-foreground",
+      className
+    )}
+    data-language={language}
+    style={{
+      containIntrinsicSize: "auto 200px",
+      contentVisibility: "auto",
+      ...style,
+    }}
+    {...props}
+  />
+);
+
+export const CodeBlockHeader = ({
+  children,
+  className,
+  ...props
+}: HTMLAttributes<HTMLDivElement>) => (
+  <div
+    className={cn(
+      "flex items-center justify-between border-b bg-muted/80 px-3 py-2 text-muted-foreground text-xs",
+      className
+    )}
+    {...props}
+  >
+    {children}
+  </div>
+);
+
+export const CodeBlockTitle = ({
+  children,
+  className,
+  ...props
+}: HTMLAttributes<HTMLDivElement>) => (
+  <div className={cn("flex items-center gap-2", className)} {...props}>
+    {children}
+  </div>
+);
+
+export const CodeBlockFilename = ({
+  children,
+  className,
+  ...props
+}: HTMLAttributes<HTMLSpanElement>) => (
+  <span className={cn("font-mono", className)} {...props}>
+    {children}
+  </span>
+);
+
+export const CodeBlockActions = ({
+  children,
+  className,
+  ...props
+}: HTMLAttributes<HTMLDivElement>) => (
+  <div
+    className={cn("-my-1 -mr-1 flex items-center gap-2", className)}
+    {...props}
+  >
+    {children}
+  </div>
+);
+
+export const CodeBlockContent = ({
+  code,
+  language,
+  showLineNumbers = false,
+}: {
+  code: string;
+  language: BundledLanguage;
+  showLineNumbers?: boolean;
+}) => {
+  // Memoized raw tokens for immediate display
+  const rawTokens = useMemo(() => createRawTokens(code), [code]);
+
+  // Synchronous cache lookup — avoids setState in effect for cached results
+  const syncTokens = useMemo(
+    () => highlightCode(code, language) ?? rawTokens,
+    [code, language, rawTokens]
+  );
+
+  // Async highlighting result (populated after shiki loads)
+  const [asyncTokens, setAsyncTokens] = useState<TokenizedCode | null>(null);
+  const asyncKeyRef = useRef({ code, language });
+
+  // Invalidate stale async tokens synchronously during render
+  if (
+    asyncKeyRef.current.code !== code ||
+    asyncKeyRef.current.language !== language
+  ) {
+    asyncKeyRef.current = { code, language };
+    setAsyncTokens(null);
+  }
+
+  useEffect(() => {
+    let cancelled = false;
+
+    highlightCode(code, language, (result) => {
+      if (!cancelled) {
+        setAsyncTokens(result);
+      }
+    });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [code, language]);
+
+  const tokenized = asyncTokens ?? syncTokens;
+
+  return (
+    <div className="relative overflow-auto">
+      <CodeBlockBody showLineNumbers={showLineNumbers} tokenized={tokenized} />
+    </div>
+  );
+};
+
+export const CodeBlock = ({
+  code,
+  language,
+  showLineNumbers = false,
+  className,
+  children,
+  ...props
+}: CodeBlockProps) => {
+  const contextValue = useMemo(() => ({ code }), [code]);
+
+  return (
+    <CodeBlockContext.Provider value={contextValue}>
+      <CodeBlockContainer className={className} language={language} {...props}>
+        {children}
+        <CodeBlockContent
+          code={code}
+          language={language}
+          showLineNumbers={showLineNumbers}
+        />
+      </CodeBlockContainer>
+    </CodeBlockContext.Provider>
+  );
+};
+
+export type CodeBlockCopyButtonProps = ComponentProps<typeof Button> & {
+  onCopy?: () => void;
+  onError?: (error: Error) => void;
+  timeout?: number;
+};
+
+export const CodeBlockCopyButton = ({
+  onCopy,
+  onError,
+  timeout = 2000,
+  children,
+  className,
+  ...props
+}: CodeBlockCopyButtonProps) => {
+  const [isCopied, setIsCopied] = useState(false);
+  const timeoutRef = useRef<number>(0);
+  const { code } = useContext(CodeBlockContext);
+
+  const copyToClipboard = useCallback(async () => {
+    if (typeof window === "undefined" || !navigator?.clipboard?.writeText) {
+      onError?.(new Error("Clipboard API not available"));
+      return;
+    }
+
+    try {
+      if (!isCopied) {
+        await navigator.clipboard.writeText(code);
+        setIsCopied(true);
+        onCopy?.();
+        timeoutRef.current = window.setTimeout(
+          () => setIsCopied(false),
+          timeout
+        );
+      }
+    } catch (error) {
+      onError?.(error as Error);
+    }
+  }, [code, onCopy, onError, timeout, isCopied]);
+
+  useEffect(
+    () => () => {
+      window.clearTimeout(timeoutRef.current);
+    },
+    []
+  );
+
+  const Icon = isCopied ? CheckIcon : CopyIcon;
+
+  return (
+    <Button
+      className={cn("shrink-0", className)}
+      onClick={copyToClipboard}
+      size="icon"
+      variant="ghost"
+      {...props}
+    >
+      {children ?? <Icon size={14} />}
+    </Button>
+  );
+};
+
+export type CodeBlockLanguageSelectorProps = ComponentProps<typeof Select>;
+
+export const CodeBlockLanguageSelector = (
+  props: CodeBlockLanguageSelectorProps
+) => <Select {...props} />;
+
+export type CodeBlockLanguageSelectorTriggerProps = ComponentProps<
+  typeof SelectTrigger
+>;
+
+export const CodeBlockLanguageSelectorTrigger = ({
+  className,
+  ...props
+}: CodeBlockLanguageSelectorTriggerProps) => (
+  <SelectTrigger
+    className={cn(
+      "h-7 border-none bg-transparent px-2 text-xs shadow-none",
+      className
+    )}
+    size="sm"
+    {...props}
+  />
+);
+
+export type CodeBlockLanguageSelectorValueProps = ComponentProps<
+  typeof SelectValue
+>;
+
+export const CodeBlockLanguageSelectorValue = (
+  props: CodeBlockLanguageSelectorValueProps
+) => <SelectValue {...props} />;
+
+export type CodeBlockLanguageSelectorContentProps = ComponentProps<
+  typeof SelectContent
+>;
+
+export const CodeBlockLanguageSelectorContent = ({
+  align = "end",
+  ...props
+}: CodeBlockLanguageSelectorContentProps) => (
+  <SelectContent align={align} {...props} />
+);
+
+export type CodeBlockLanguageSelectorItemProps = ComponentProps<
+  typeof SelectItem
+>;
+
+export const CodeBlockLanguageSelectorItem = (
+  props: CodeBlockLanguageSelectorItemProps
+) => <SelectItem {...props} />;
--- a/packages/ui/src/components/ai-elements/conversation.tsx
+++ b/packages/ui/src/components/ai-elements/conversation.tsx
@@ -0,0 +1,168 @@
+"use client";
+
+import { Button } from "@code/ui/components/button";
+import { cn } from "@code/ui/lib/utils";
+import type { UIMessage } from "ai";
+import { ArrowDownIcon, DownloadIcon } from "lucide-react";
+import type { ComponentProps } from "react";
+import { useCallback } from "react";
+import { StickToBottom, useStickToBottomContext } from "use-stick-to-bottom";
+
+export type ConversationProps = ComponentProps<typeof StickToBottom>;
+
+export const Conversation = ({ className, ...props }: ConversationProps) => (
+  <StickToBottom
+    className={cn("relative flex-1 overflow-y-hidden", className)}
+    initial="smooth"
+    resize="smooth"
+    role="log"
+    {...props}
+  />
+);
+
+export type ConversationContentProps = ComponentProps<
+  typeof StickToBottom.Content
+>;
+
+export const ConversationContent = ({
+  className,
+  ...props
+}: ConversationContentProps) => (
+  <StickToBottom.Content
+    className={cn("flex flex-col gap-8 p-4", className)}
+    {...props}
+  />
+);
+
+export type ConversationEmptyStateProps = ComponentProps<"div"> & {
+  title?: string;
+  description?: string;
+  icon?: React.ReactNode;
+};
+
+export const ConversationEmptyState = ({
+  className,
+  title = "No messages yet",
+  description = "Start a conversation to see messages here",
+  icon,
+  children,
+  ...props
+}: ConversationEmptyStateProps) => (
+  <div
+    className={cn(
+      "flex size-full flex-col items-center justify-center gap-3 p-8 text-center",
+      className
+    )}
+    {...props}
+  >
+    {children ?? (
+      <>
+        {icon && <div className="text-muted-foreground">{icon}</div>}
+        <div className="space-y-1">
+          <h3 className="font-medium text-sm">{title}</h3>
+          {description && (
+            <p className="text-muted-foreground text-sm">{description}</p>
+          )}
+        </div>
+      </>
+    )}
+  </div>
+);
+
+export type ConversationScrollButtonProps = ComponentProps<typeof Button>;
+
+export const ConversationScrollButton = ({
+  className,
+  ...props
+}: ConversationScrollButtonProps) => {
+  const { isAtBottom, scrollToBottom } = useStickToBottomContext();
+
+  const handleScrollToBottom = useCallback(() => {
+    scrollToBottom();
+  }, [scrollToBottom]);
+
+  return (
+    !isAtBottom && (
+      <Button
+        className={cn(
+          "absolute bottom-4 left-[50%] translate-x-[-50%] rounded-full dark:bg-background dark:hover:bg-muted",
+          className
+        )}
+        onClick={handleScrollToBottom}
+        size="icon"
+        type="button"
+        variant="outline"
+        {...props}
+      >
+        <ArrowDownIcon className="size-4" />
+      </Button>
+    )
+  );
+};
+
+const getMessageText = (message: UIMessage): string =>
+  message.parts
+    .filter((part) => part.type === "text")
+    .map((part) => part.text)
+    .join("");
+
+export type ConversationDownloadProps = Omit<
+  ComponentProps<typeof Button>,
+  "onClick"
+> & {
+  messages: UIMessage[];
+  filename?: string;
+  formatMessage?: (message: UIMessage, index: number) => string;
+};
+
+const defaultFormatMessage = (message: UIMessage): string => {
+  const roleLabel =
+    message.role.charAt(0).toUpperCase() + message.role.slice(1);
+  return `**${roleLabel}:** ${getMessageText(message)}`;
+};
+
+export const messagesToMarkdown = (
+  messages: UIMessage[],
+  formatMessage: (
+    message: UIMessage,
+    index: number
+  ) => string = defaultFormatMessage
+): string => messages.map((msg, i) => formatMessage(msg, i)).join("\n\n");
+
+export const ConversationDownload = ({
+  messages,
+  filename = "conversation.md",
+  formatMessage = defaultFormatMessage,
+  className,
+  children,
+  ...props
+}: ConversationDownloadProps) => {
+  const handleDownload = useCallback(() => {
+    const markdown = messagesToMarkdown(messages, formatMessage);
+    const blob = new Blob([markdown], { type: "text/markdown" });
+    const url = URL.createObjectURL(blob);
+    const link = document.createElement("a");
+    link.href = url;
+    link.download = filename;
+    document.body.append(link);
+    link.click();
+    link.remove();
+    URL.revokeObjectURL(url);
+  }, [messages, filename, formatMessage]);
+
+  return (
+    <Button
+      className={cn(
+        "absolute top-4 right-4 rounded-full dark:bg-background dark:hover:bg-muted",
+        className
+      )}
+      onClick={handleDownload}
+      size="icon"
+      type="button"
+      variant="outline"
+      {...props}
+    >
+      {children ?? <DownloadIcon className="size-4" />}
+    </Button>
+  );
+};
--- a/packages/ui/src/components/ai-elements/message.tsx
+++ b/packages/ui/src/components/ai-elements/message.tsx
@@ -0,0 +1,360 @@
+"use client";
+
+import { Button } from "@code/ui/components/button";
+import {
+  ButtonGroup,
+  ButtonGroupText,
+} from "@code/ui/components/button-group";
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipProvider,
+  TooltipTrigger,
+} from "@code/ui/components/tooltip";
+import { cn } from "@code/ui/lib/utils";
+import { cjk } from "@streamdown/cjk";
+import { code } from "@streamdown/code";
+import { math } from "@streamdown/math";
+import { mermaid } from "@streamdown/mermaid";
+import type { UIMessage } from "ai";
+import { ChevronLeftIcon, ChevronRightIcon } from "lucide-react";
+import type { ComponentProps, HTMLAttributes, ReactElement } from "react";
+import {
+  createContext,
+  memo,
+  useCallback,
+  useContext,
+  useEffect,
+  useMemo,
+  useState,
+} from "react";
+import { Streamdown } from "streamdown";
+
+export type MessageProps = HTMLAttributes<HTMLDivElement> & {
+  from: UIMessage["role"];
+};
+
+export const Message = ({ className, from, ...props }: MessageProps) => (
+  <div
+    className={cn(
+      "group flex w-full max-w-[95%] flex-col gap-2",
+      from === "user" ? "is-user ml-auto justify-end" : "is-assistant",
+      className
+    )}
+    {...props}
+  />
+);
+
+export type MessageContentProps = HTMLAttributes<HTMLDivElement>;
+
+export const MessageContent = ({
+  children,
+  className,
+  ...props
+}: MessageContentProps) => (
+  <div
+    className={cn(
+      "is-user:dark flex w-fit min-w-0 max-w-full flex-col gap-2 overflow-hidden text-sm",
+      "group-[.is-user]:ml-auto group-[.is-user]:rounded-lg group-[.is-user]:bg-secondary group-[.is-user]:px-4 group-[.is-user]:py-3 group-[.is-user]:text-foreground",
+      "group-[.is-assistant]:text-foreground",
+      className
+    )}
+    {...props}
+  >
+    {children}
+  </div>
+);
+
+export type MessageActionsProps = ComponentProps<"div">;
+
+export const MessageActions = ({
+  className,
+  children,
+  ...props
+}: MessageActionsProps) => (
+  <div className={cn("flex items-center gap-1", className)} {...props}>
+    {children}
+  </div>
+);
+
+export type MessageActionProps = ComponentProps<typeof Button> & {
+  tooltip?: string;
+  label?: string;
+};
+
+export const MessageAction = ({
+  tooltip,
+  children,
+  label,
+  variant = "ghost",
+  size = "icon-sm",
+  ...props
+}: MessageActionProps) => {
+  const button = (
+    <Button size={size} type="button" variant={variant} {...props}>
+      {children}
+      <span className="sr-only">{label || tooltip}</span>
+    </Button>
+  );
+
+  if (tooltip) {
+    return (
+      <TooltipProvider>
+        <Tooltip>
+          <TooltipTrigger>{button}</TooltipTrigger>
+          <TooltipContent>
+            <p>{tooltip}</p>
+          </TooltipContent>
+        </Tooltip>
+      </TooltipProvider>
+    );
+  }
+
+  return button;
+};
+
+interface MessageBranchContextType {
+  currentBranch: number;
+  totalBranches: number;
+  goToPrevious: () => void;
+  goToNext: () => void;
+  branches: ReactElement[];
+  setBranches: (branches: ReactElement[]) => void;
+}
+
+const MessageBranchContext = createContext<MessageBranchContextType | null>(
+  null
+);
+
+const useMessageBranch = () => {
+  const context = useContext(MessageBranchContext);
+
+  if (!context) {
+    throw new Error(
+      "MessageBranch components must be used within MessageBranch"
+    );
+  }
+
+  return context;
+};
+
+export type MessageBranchProps = HTMLAttributes<HTMLDivElement> & {
+  defaultBranch?: number;
+  onBranchChange?: (branchIndex: number) => void;
+};
+
+export const MessageBranch = ({
+  defaultBranch = 0,
+  onBranchChange,
+  className,
+  ...props
+}: MessageBranchProps) => {
+  const [currentBranch, setCurrentBranch] = useState(defaultBranch);
+  const [branches, setBranches] = useState<ReactElement[]>([]);
+
+  const handleBranchChange = useCallback(
+    (newBranch: number) => {
+      setCurrentBranch(newBranch);
+      onBranchChange?.(newBranch);
+    },
+    [onBranchChange]
+  );
+
+  const goToPrevious = useCallback(() => {
+    const newBranch =
+      currentBranch > 0 ? currentBranch - 1 : branches.length - 1;
+    handleBranchChange(newBranch);
+  }, [currentBranch, branches.length, handleBranchChange]);
+
+  const goToNext = useCallback(() => {
+    const newBranch =
+      currentBranch < branches.length - 1 ? currentBranch + 1 : 0;
+    handleBranchChange(newBranch);
+  }, [currentBranch, branches.length, handleBranchChange]);
+
+  const contextValue = useMemo<MessageBranchContextType>(
+    () => ({
+      branches,
+      currentBranch,
+      goToNext,
+      goToPrevious,
+      setBranches,
+      totalBranches: branches.length,
+    }),
+    [branches, currentBranch, goToNext, goToPrevious]
+  );
+
+  return (
+    <MessageBranchContext.Provider value={contextValue}>
+      <div
+        className={cn("grid w-full gap-2 [&>div]:pb-0", className)}
+        {...props}
+      />
+    </MessageBranchContext.Provider>
+  );
+};
+
+export type MessageBranchContentProps = HTMLAttributes<HTMLDivElement>;
+
+export const MessageBranchContent = ({
+  children,
+  ...props
+}: MessageBranchContentProps) => {
+  const { currentBranch, setBranches, branches } = useMessageBranch();
+  const childrenArray = useMemo(
+    () => (Array.isArray(children) ? children : [children]),
+    [children]
+  );
+
+  // Use useEffect to update branches when they change
+  useEffect(() => {
+    if (branches.length !== childrenArray.length) {
+      setBranches(childrenArray);
+    }
+  }, [childrenArray, branches, setBranches]);
+
+  return childrenArray.map((branch, index) => (
+    <div
+      className={cn(
+        "grid gap-2 overflow-hidden [&>div]:pb-0",
+        index === currentBranch ? "block" : "hidden"
+      )}
+      key={branch.key}
+      {...props}
+    >
+      {branch}
+    </div>
+  ));
+};
+
+export type MessageBranchSelectorProps = ComponentProps<typeof ButtonGroup>;
+
+export const MessageBranchSelector = ({
+  className,
+  ...props
+}: MessageBranchSelectorProps) => {
+  const { totalBranches } = useMessageBranch();
+
+  // Don't render if there's only one branch
+  if (totalBranches <= 1) {
+    return null;
+  }
+
+  return (
+    <ButtonGroup
+      className={cn(
+        "[&>*:not(:first-child)]:rounded-l-md [&>*:not(:last-child)]:rounded-r-md",
+        className
+      )}
+      orientation="horizontal"
+      {...props}
+    />
+  );
+};
+
+export type MessageBranchPreviousProps = ComponentProps<typeof Button>;
+
+export const MessageBranchPrevious = ({
+  children,
+  ...props
+}: MessageBranchPreviousProps) => {
+  const { goToPrevious, totalBranches } = useMessageBranch();
+
+  return (
+    <Button
+      aria-label="Previous branch"
+      disabled={totalBranches <= 1}
+      onClick={goToPrevious}
+      size="icon-sm"
+      type="button"
+      variant="ghost"
+      {...props}
+    >
+      {children ?? <ChevronLeftIcon size={14} />}
+    </Button>
+  );
+};
+
+export type MessageBranchNextProps = ComponentProps<typeof Button>;
+
+export const MessageBranchNext = ({
+  children,
+  ...props
+}: MessageBranchNextProps) => {
+  const { goToNext, totalBranches } = useMessageBranch();
+
+  return (
+    <Button
+      aria-label="Next branch"
+      disabled={totalBranches <= 1}
+      onClick={goToNext}
+      size="icon-sm"
+      type="button"
+      variant="ghost"
+      {...props}
+    >
+      {children ?? <ChevronRightIcon size={14} />}
+    </Button>
+  );
+};
+
+export type MessageBranchPageProps = HTMLAttributes<HTMLSpanElement>;
+
+export const MessageBranchPage = ({
+  className,
+  ...props
+}: MessageBranchPageProps) => {
+  const { currentBranch, totalBranches } = useMessageBranch();
+
+  return (
+    <ButtonGroupText
+      className={cn(
+        "border-none bg-transparent text-muted-foreground shadow-none",
+        className
+      )}
+      {...props}
+    >
+      {currentBranch + 1} of {totalBranches}
+    </ButtonGroupText>
+  );
+};
+
+export type MessageResponseProps = ComponentProps<typeof Streamdown>;
+
+const streamdownPlugins = { cjk, code, math, mermaid };
+
+export const MessageResponse = memo(
+  ({ className, ...props }: MessageResponseProps) => (
+    <Streamdown
+      className={cn(
+        "size-full [&>*:first-child]:mt-0 [&>*:last-child]:mb-0",
+        className
+      )}
+      plugins={streamdownPlugins}
+      {...props}
+    />
+  ),
+  (prevProps, nextProps) =>
+    prevProps.children === nextProps.children &&
+    nextProps.isAnimating === prevProps.isAnimating
+);
+
+MessageResponse.displayName = "MessageResponse";
+
+export type MessageToolbarProps = ComponentProps<"div">;
+
+export const MessageToolbar = ({
+  className,
+  children,
+  ...props
+}: MessageToolbarProps) => (
+  <div
+    className={cn(
+      "mt-4 flex w-full items-center justify-between gap-4",
+      className
+    )}
+    {...props}
+  >
+    {children}
+  </div>
+);
--- a/packages/ui/src/components/ai-elements/tool.tsx
+++ b/packages/ui/src/components/ai-elements/tool.tsx
@@ -0,0 +1,173 @@
+"use client";
+
+import { Badge } from "@code/ui/components/badge";
+import {
+  Collapsible,
+  CollapsibleContent,
+  CollapsibleTrigger,
+} from "@code/ui/components/collapsible";
+import { cn } from "@code/ui/lib/utils";
+import type { DynamicToolUIPart, ToolUIPart } from "ai";
+import {
+  CheckCircleIcon,
+  ChevronDownIcon,
+  CircleIcon,
+  ClockIcon,
+  WrenchIcon,
+  XCircleIcon,
+} from "lucide-react";
+import type { ComponentProps, ReactNode } from "react";
+import { isValidElement } from "react";
+
+import { CodeBlock } from "./code-block";
+
+export type ToolProps = ComponentProps<typeof Collapsible>;
+
+export const Tool = ({ className, ...props }: ToolProps) => (
+  <Collapsible
+    className={cn("group not-prose mb-4 w-full rounded-md border", className)}
+    {...props}
+  />
+);
+
+export type ToolPart = ToolUIPart | DynamicToolUIPart;
+
+export type ToolHeaderProps = {
+  title?: string;
+  className?: string;
+} & (
+  | { type: ToolUIPart["type"]; state: ToolUIPart["state"]; toolName?: never }
+  | {
+      type: DynamicToolUIPart["type"];
+      state: DynamicToolUIPart["state"];
+      toolName: string;
+    }
+);
+
+const statusLabels: Record<ToolPart["state"], string> = {
+  "approval-requested": "Awaiting Approval",
+  "approval-responded": "Responded",
+  "input-available": "Running",
+  "input-streaming": "Pending",
+  "output-available": "Completed",
+  "output-denied": "Denied",
+  "output-error": "Error",
+};
+
+const statusIcons: Record<ToolPart["state"], ReactNode> = {
+  "approval-requested": <ClockIcon className="size-4 text-yellow-600" />,
+  "approval-responded": <CheckCircleIcon className="size-4 text-blue-600" />,
+  "input-available": <ClockIcon className="size-4 animate-pulse" />,
+  "input-streaming": <CircleIcon className="size-4" />,
+  "output-available": <CheckCircleIcon className="size-4 text-green-600" />,
+  "output-denied": <XCircleIcon className="size-4 text-orange-600" />,
+  "output-error": <XCircleIcon className="size-4 text-red-600" />,
+};
+
+export const getStatusBadge = (status: ToolPart["state"]) => (
+  <Badge className="gap-1.5 rounded-full text-xs" variant="secondary">
+    {statusIcons[status]}
+    {statusLabels[status]}
+  </Badge>
+);
+
+export const ToolHeader = ({
+  className,
+  title,
+  type,
+  state,
+  toolName,
+  ...props
+}: ToolHeaderProps) => {
+  const derivedName =
+    type === "dynamic-tool" ? toolName : type.split("-").slice(1).join("-");
+
+  return (
+    <CollapsibleTrigger
+      className={cn(
+        "flex w-full items-center justify-between gap-4 p-3",
+        className
+      )}
+      {...props}
+    >
+      <div className="flex items-center gap-2">
+        <WrenchIcon className="size-4 text-muted-foreground" />
+        <span className="font-medium text-sm">{title ?? derivedName}</span>
+        {getStatusBadge(state)}
+      </div>
+      <ChevronDownIcon className="size-4 text-muted-foreground transition-transform group-data-[state=open]:rotate-180" />
+    </CollapsibleTrigger>
+  );
+};
+
+export type ToolContentProps = ComponentProps<typeof CollapsibleContent>;
+
+export const ToolContent = ({ className, ...props }: ToolContentProps) => (
+  <CollapsibleContent
+    className={cn(
+      "data-[state=closed]:fade-out-0 data-[state=closed]:slide-out-to-top-2 data-[state=open]:slide-in-from-top-2 space-y-4 p-4 text-popover-foreground outline-none data-[state=closed]:animate-out data-[state=open]:animate-in",
+      className
+    )}
+    {...props}
+  />
+);
+
+export type ToolInputProps = ComponentProps<"div"> & {
+  input: ToolPart["input"];
+};
+
+export const ToolInput = ({ className, input, ...props }: ToolInputProps) => (
+  <div className={cn("space-y-2 overflow-hidden", className)} {...props}>
+    <h4 className="font-medium text-muted-foreground text-xs uppercase tracking-wide">
+      Parameters
+    </h4>
+    <div className="rounded-md bg-muted/50">
+      <CodeBlock code={JSON.stringify(input, null, 2)} language="json" />
+    </div>
+  </div>
+);
+
+export type ToolOutputProps = ComponentProps<"div"> & {
+  output: ToolPart["output"];
+  errorText: ToolPart["errorText"];
+};
+
+export const ToolOutput = ({
+  className,
+  output,
+  errorText,
+  ...props
+}: ToolOutputProps) => {
+  if (!(output || errorText)) {
+    return null;
+  }
+
+  let Output = <div>{output as ReactNode}</div>;
+
+  if (typeof output === "object" && !isValidElement(output)) {
+    Output = (
+      <CodeBlock code={JSON.stringify(output, null, 2)} language="json" />
+    );
+  } else if (typeof output === "string") {
+    Output = <CodeBlock code={output} language="json" />;
+  }
+
+  return (
+    <div className={cn("space-y-2", className)} {...props}>
+      <h4 className="font-medium text-muted-foreground text-xs uppercase tracking-wide">
+        {errorText ? "Error" : "Result"}
+      </h4>
+      <div
+        className={cn(
+          "overflow-x-auto rounded-md text-xs [&_table]:w-full",
+          errorText
+            ? "bg-destructive/10 text-destructive"
+            : "bg-muted/50 text-foreground"
+        )}
+      >
+        {errorText && <div>{errorText}</div>}
+        {Output}
+      </div>
+    </div>
+  );
+};
--- a/packages/ui/src/components/badge.tsx
+++ b/packages/ui/src/components/badge.tsx
@@ -0,0 +1,52 @@
+import { mergeProps } from "@base-ui/react/merge-props"
+import { useRender } from "@base-ui/react/use-render"
+import { cva, type VariantProps } from "class-variance-authority"
+
+import { cn } from "@code/ui/lib/utils"
+
+const badgeVariants = cva(
+  "group/badge inline-flex h-5 w-fit shrink-0 items-center justify-center gap-1 overflow-hidden rounded-none border border-transparent px-2 py-0.5 text-xs font-medium whitespace-nowrap transition-all focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 has-data-[icon=inline-end]:pr-1.5 has-data-[icon=inline-start]:pl-1.5 aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 [&>svg]:pointer-events-none [&>svg]:size-3!",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground [a]:hover:bg-primary/80",
+        secondary:
+          "bg-secondary text-secondary-foreground [a]:hover:bg-secondary/80",
+        destructive:
+          "bg-destructive/10 text-destructive focus-visible:ring-destructive/20 dark:bg-destructive/20 dark:focus-visible:ring-destructive/40 [a]:hover:bg-destructive/20",
+        outline:
+          "border-border text-foreground [a]:hover:bg-muted [a]:hover:text-muted-foreground",
+        ghost:
+          "hover:bg-muted hover:text-muted-foreground dark:hover:bg-muted/50",
+        link: "text-primary underline-offset-4 hover:underline",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+)
+
+function Badge({
+  className,
+  variant = "default",
+  render,
+  ...props
+}: useRender.ComponentProps<"span"> & VariantProps<typeof badgeVariants>) {
+  return useRender({
+    defaultTagName: "span",
+    props: mergeProps<"span">(
+      {
+        className: cn(badgeVariants({ variant }), className),
+      },
+      props
+    ),
+    render,
+    state: {
+      slot: "badge",
+      variant,
+    },
+  })
+}
+
+export { Badge, badgeVariants }
--- a/packages/ui/src/components/button-group.tsx
+++ b/packages/ui/src/components/button-group.tsx
@@ -0,0 +1,87 @@
+import { mergeProps } from "@base-ui/react/merge-props"
+import { useRender } from "@base-ui/react/use-render"
+import { cva, type VariantProps } from "class-variance-authority"
+
+import { cn } from "@code/ui/lib/utils"
+import { Separator } from "@code/ui/components/separator"
+
+const buttonGroupVariants = cva(
+  "flex w-fit items-stretch rounded-none *:focus-visible:relative *:focus-visible:z-10 has-[>[data-slot=button-group]]:gap-2 has-[select[aria-hidden=true]:last-child]:[&>[data-slot=select-trigger]:last-of-type]:rounded-none [&>[data-slot=select-trigger]:not([class*='w-'])]:w-fit [&>input]:flex-1",
+  {
+    variants: {
+      orientation: {
+        horizontal:
+          "*:data-slot:rounded-r-none [&>[data-slot]~[data-slot]]:rounded-l-none [&>[data-slot]~[data-slot]]:border-l-0",
+        vertical:
+          "flex-col *:data-slot:rounded-b-none [&>[data-slot]~[data-slot]]:rounded-t-none [&>[data-slot]~[data-slot]]:border-t-0",
+      },
+    },
+    defaultVariants: {
+      orientation: "horizontal",
+    },
+  }
+)
+
+function ButtonGroup({
+  className,
+  orientation,
+  ...props
+}: React.ComponentProps<"div"> & VariantProps<typeof buttonGroupVariants>) {
+  return (
+    <div
+      role="group"
+      data-slot="button-group"
+      data-orientation={orientation}
+      className={cn(buttonGroupVariants({ orientation }), className)}
+      {...props}
+    />
+  )
+}
+
+function ButtonGroupText({
+  className,
+  render,
+  ...props
+}: useRender.ComponentProps<"div">) {
+  return useRender({
+    defaultTagName: "div",
+    props: mergeProps<"div">(
+      {
+        className: cn(
+          "flex items-center gap-2 rounded-none border bg-muted px-2.5 text-xs font-medium [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4",
+          className
+        ),
+      },
+      props
+    ),
+    render,
+    state: {
+      slot: "button-group-text",
+    },
+  })
+}
+
+function ButtonGroupSeparator({
+  className,
+  orientation = "vertical",
+  ...props
+}: React.ComponentProps<typeof Separator>) {
+  return (
+    <Separator
+      data-slot="button-group-separator"
+      orientation={orientation}
+      className={cn(
+        "relative self-stretch bg-input data-horizontal:mx-px data-horizontal:w-auto data-vertical:my-px data-vertical:h-auto",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export {
+  ButtonGroup,
+  ButtonGroupSeparator,
+  ButtonGroupText,
+  buttonGroupVariants,
+}
--- a/packages/ui/src/components/collapsible.tsx
+++ b/packages/ui/src/components/collapsible.tsx
@@ -0,0 +1,19 @@
+import { Collapsible as CollapsiblePrimitive } from "@base-ui/react/collapsible"
+
+function Collapsible({ ...props }: CollapsiblePrimitive.Root.Props) {
+  return <CollapsiblePrimitive.Root data-slot="collapsible" {...props} />
+}
+
+function CollapsibleTrigger({ ...props }: CollapsiblePrimitive.Trigger.Props) {
+  return (
+    <CollapsiblePrimitive.Trigger data-slot="collapsible-trigger" {...props} />
+  )
+}
+
+function CollapsibleContent({ ...props }: CollapsiblePrimitive.Panel.Props) {
+  return (
+    <CollapsiblePrimitive.Panel data-slot="collapsible-content" {...props} />
+  )
+}
+
+export { Collapsible, CollapsibleTrigger, CollapsibleContent }
--- a/packages/ui/src/components/mobile-chat.tsx
+++ b/packages/ui/src/components/mobile-chat.tsx
@@ -239,6 +239,45 @@ const MobileChatToolResult = ({
  </div>
 );

+interface MobileChatComposerDockProps extends ComponentProps<"div"> {
+  errorMessage?: string;
+  statusMessage?: ReactNode;
+}
+
+const MobileChatComposerDock = ({
+  children,
+  className,
+  errorMessage,
+  statusMessage,
+  ...props
+}: MobileChatComposerDockProps) => {
+  const message = errorMessage ?? statusMessage;
+
+  return (
+    <div
+      data-slot="mobile-chat-composer-dock"
+      className={cn(
+        "shrink-0 border-t border-[#e8e8e6] bg-[#fefefe] pb-[env(safe-area-inset-bottom)]",
+        className
+      )}
+      {...props}
+    >
+      {message ? (
+        <div
+          id={errorMessage ? "composer-error" : undefined}
+          className={cn(
+            "px-3 pt-2 text-center text-[10px] leading-4 text-[#777875]",
+            errorMessage && "text-destructive"
+          )}
+        >
+          {message}
+        </div>
+      ) : null}
+      {children}
+    </div>
+  );
+};
+
 interface MobileChatComposerProps extends Omit<
  ComponentProps<"form">,
  "children"
@@ -260,29 +299,17 @@ const MobileChatComposer = ({
  ...props
 }: MobileChatComposerProps) => {
  const { className: textareaClassName, ...inputProps } = textareaProps;
-  const message = errorMessage ?? statusMessage;

  return (
-    <div
-      data-slot="mobile-chat-composer-dock"
-      className="shrink-0 border-t border-[#e8e8e6] bg-[#fefefe] pb-[env(safe-area-inset-bottom)]"
+    <MobileChatComposerDock
+      errorMessage={errorMessage}
+      statusMessage={statusMessage}
    >
      <form
        aria-label="Send a message"
        className={cn("w-full px-3 pt-[11px] pb-3", className)}
        {...props}
      >
-        {message ? (
-          <div
-            id={errorMessage ? "composer-error" : undefined}
-            className={cn(
-              "mb-2 px-3 text-center text-[10px] leading-4 text-[#777875]",
-              errorMessage && "text-destructive"
-            )}
-          >
-            {message}
-          </div>
-        ) : null}
        <div className="flex items-end gap-2.5">
          <textarea
            aria-label="Message Zopu"
@@ -308,7 +335,7 @@ const MobileChatComposer = ({
          </button>
        </div>
      </form>
-    </div>
+    </MobileChatComposerDock>
  );
 };

@@ -316,6 +343,7 @@ export {
  MobileChatAssistantLabel,
  MobileChatBubble,
  MobileChatComposer,
+  MobileChatComposerDock,
  MobileChatHeader,
  MobileChatMark,
  MobileChatMessage,
@@ -327,6 +355,7 @@ export type {
  MobileChatAssistantLabelProps,
  MobileChatBubbleProps,
  MobileChatComposerProps,
+  MobileChatComposerDockProps,
  MobileChatHeaderProps,
  MobileChatMessageProps,
  MobileChatToolCallProps,
--- a/packages/ui/src/components/select.tsx
+++ b/packages/ui/src/components/select.tsx
@@ -0,0 +1,201 @@
+"use client"
+
+import * as React from "react"
+import { Select as SelectPrimitive } from "@base-ui/react/select"
+
+import { cn } from "@code/ui/lib/utils"
+import { ChevronDownIcon, CheckIcon, ChevronUpIcon } from "lucide-react"
+
+const Select = SelectPrimitive.Root
+
+function SelectGroup({ className, ...props }: SelectPrimitive.Group.Props) {
+  return (
+    <SelectPrimitive.Group
+      data-slot="select-group"
+      className={cn("scroll-my-1", className)}
+      {...props}
+    />
+  )
+}
+
+function SelectValue({ className, ...props }: SelectPrimitive.Value.Props) {
+  return (
+    <SelectPrimitive.Value
+      data-slot="select-value"
+      className={cn("flex flex-1 text-left", className)}
+      {...props}
+    />
+  )
+}
+
+function SelectTrigger({
+  className,
+  size = "default",
+  children,
+  ...props
+}: SelectPrimitive.Trigger.Props & {
+  size?: "sm" | "default"
+}) {
+  return (
+    <SelectPrimitive.Trigger
+      data-slot="select-trigger"
+      data-size={size}
+      className={cn(
+        "flex w-fit items-center justify-between gap-1.5 rounded-none border border-input bg-transparent py-2 pr-2 pl-2.5 text-xs whitespace-nowrap transition-colors outline-none select-none focus-visible:border-ring focus-visible:ring-1 focus-visible:ring-ring/50 disabled:cursor-not-allowed disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-1 aria-invalid:ring-destructive/20 data-placeholder:text-muted-foreground data-[size=default]:h-8 data-[size=sm]:h-7 data-[size=sm]:rounded-none *:data-[slot=select-value]:line-clamp-1 *:data-[slot=select-value]:flex *:data-[slot=select-value]:items-center *:data-[slot=select-value]:gap-1.5 dark:bg-input/30 dark:hover:bg-input/50 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        className
+      )}
+      {...props}
+    >
+      {children}
+      <SelectPrimitive.Icon
+        render={
+          <ChevronDownIcon className="pointer-events-none size-4 text-muted-foreground" />
+        }
+      />
+    </SelectPrimitive.Trigger>
+  )
+}
+
+function SelectContent({
+  className,
+  children,
+  side = "bottom",
+  sideOffset = 4,
+  align = "center",
+  alignOffset = 0,
+  alignItemWithTrigger = true,
+  ...props
+}: SelectPrimitive.Popup.Props &
+  Pick<
+    SelectPrimitive.Positioner.Props,
+    "align" | "alignOffset" | "side" | "sideOffset" | "alignItemWithTrigger"
+  >) {
+  return (
+    <SelectPrimitive.Portal>
+      <SelectPrimitive.Positioner
+        side={side}
+        sideOffset={sideOffset}
+        align={align}
+        alignOffset={alignOffset}
+        alignItemWithTrigger={alignItemWithTrigger}
+        className="isolate z-50"
+      >
+        <SelectPrimitive.Popup
+          data-slot="select-content"
+          data-align-trigger={alignItemWithTrigger}
+          className={cn("relative isolate z-50 max-h-(--available-height) w-(--anchor-width) min-w-36 origin-(--transform-origin) overflow-x-hidden overflow-y-auto rounded-none bg-popover text-popover-foreground shadow-md ring-1 ring-foreground/10 duration-100 data-[align-trigger=true]:animate-none data-[side=bottom]:slide-in-from-top-2 data-[side=inline-end]:slide-in-from-left-2 data-[side=inline-start]:slide-in-from-right-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95", className )}
+          {...props}
+        >
+          <SelectScrollUpButton />
+          <SelectPrimitive.List>{children}</SelectPrimitive.List>
+          <SelectScrollDownButton />
+        </SelectPrimitive.Popup>
+      </SelectPrimitive.Positioner>
+    </SelectPrimitive.Portal>
+  )
+}
+
+function SelectLabel({
+  className,
+  ...props
+}: SelectPrimitive.GroupLabel.Props) {
+  return (
+    <SelectPrimitive.GroupLabel
+      data-slot="select-label"
+      className={cn("px-2 py-2 text-xs text-muted-foreground", className)}
+      {...props}
+    />
+  )
+}
+
+function SelectItem({
+  className,
+  children,
+  ...props
+}: SelectPrimitive.Item.Props) {
+  return (
+    <SelectPrimitive.Item
+      data-slot="select-item"
+      className={cn(
+        "relative flex w-full cursor-default items-center gap-2 rounded-none py-2 pr-8 pl-2 text-xs outline-hidden select-none focus:bg-accent focus:text-accent-foreground not-data-[variant=destructive]:focus:**:text-accent-foreground data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4 *:[span]:last:flex *:[span]:last:items-center *:[span]:last:gap-2",
+        className
+      )}
+      {...props}
+    >
+      <SelectPrimitive.ItemText className="flex flex-1 shrink-0 gap-2 whitespace-nowrap">
+        {children}
+      </SelectPrimitive.ItemText>
+      <SelectPrimitive.ItemIndicator
+        render={
+          <span className="pointer-events-none absolute right-2 flex size-4 items-center justify-center" />
+        }
+      >
+        <CheckIcon className="pointer-events-none" />
+      </SelectPrimitive.ItemIndicator>
+    </SelectPrimitive.Item>
+  )
+}
+
+function SelectSeparator({
+  className,
+  ...props
+}: SelectPrimitive.Separator.Props) {
+  return (
+    <SelectPrimitive.Separator
+      data-slot="select-separator"
+      className={cn("pointer-events-none -mx-1 h-px bg-border", className)}
+      {...props}
+    />
+  )
+}
+
+function SelectScrollUpButton({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.ScrollUpArrow>) {
+  return (
+    <SelectPrimitive.ScrollUpArrow
+      data-slot="select-scroll-up-button"
+      className={cn(
+        "top-0 z-10 flex w-full cursor-default items-center justify-center bg-popover py-1 [&_svg:not([class*='size-'])]:size-4",
+        className
+      )}
+      {...props}
+    >
+      <ChevronUpIcon
+      />
+    </SelectPrimitive.ScrollUpArrow>
+  )
+}
+
+function SelectScrollDownButton({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.ScrollDownArrow>) {
+  return (
+    <SelectPrimitive.ScrollDownArrow
+      data-slot="select-scroll-down-button"
+      className={cn(
+        "bottom-0 z-10 flex w-full cursor-default items-center justify-center bg-popover py-1 [&_svg:not([class*='size-'])]:size-4",
+        className
+      )}
+      {...props}
+    >
+      <ChevronDownIcon
+      />
+    </SelectPrimitive.ScrollDownArrow>
+  )
+}
+
+export {
+  Select,
+  SelectContent,
+  SelectGroup,
+  SelectItem,
+  SelectLabel,
+  SelectScrollDownButton,
+  SelectScrollUpButton,
+  SelectSeparator,
+  SelectTrigger,
+  SelectValue,
+}