thread-list

name	thread-list
description	Implements multi-thread (conversation history) management in assistant-ui apps: rendering the prebuilt `ThreadList` next to `Thread`, or building a custom sidebar with `ThreadListPrimitive` and `ThreadListItemPrimitive` (Root, New, Items, Trigger, Title, Archive, Unarchive, Delete). Covers thread CRUD through the `useAui()`/`useAuiState()` API: `switchToThread`, `switchToNewThread`, and per item `rename`, `archive`, `unarchive`, `delete`, `generateTitle`, `initialize`, plus reading `s.threads.threadIds`/`archivedThreadIds`/`mainThreadId`. Includes cloud-backed persistence via `useChatRuntime` + `AssistantCloud` and a local `useRemoteThreadListRuntime` + `InMemoryThreadListAdapter` path. Use when a user wants a thread list/sidebar, switching, searching, sorting, drag-and-drop, or renaming/archiving/deleting conversations. For single-thread state, messages, or composer use runtime; for cloud auth/persistence setup use cloud.
license	MIT

assistant-ui Thread List

Always consult assistant-ui.com/llms.txt for the latest API.

Manage multiple chat threads with built-in or custom UI.

References

• ./references/management.md -- Thread CRUD operations
• ./references/custom-ui.md -- Custom thread list UI

Quick Start

Thread list is available with useChatRuntime + cloud:

import { AssistantCloud } from "assistant-cloud";
import { useChatRuntime, AssistantChatTransport } from "@assistant-ui/react-ai-sdk";
import { AssistantRuntimeProvider } from "@assistant-ui/react";
import { ThreadList } from "@/components/assistant-ui/thread-list";
import { Thread } from "@/components/assistant-ui/thread";

const cloud = new AssistantCloud({
  baseUrl: process.env.NEXT_PUBLIC_ASSISTANT_BASE_URL,
  authToken: async () => getAuthToken(),
});

function Chat() {
  const runtime = useChatRuntime({
    transport: new AssistantChatTransport({ api: "/api/chat" }),
    cloud,
  });

  return (
    <AssistantRuntimeProvider runtime={runtime}>
      <div className="flex h-screen">
        <ThreadList className="w-64 border-r" />
        <Thread className="flex-1" />
      </div>
    </AssistantRuntimeProvider>
  );
}

Thread Operations

import { useAui, useAuiState } from "@assistant-ui/react";

const api = useAui();
const { threadIds, mainThreadId } = useAuiState((s) => ({
  threadIds: s.threads.threadIds,
  mainThreadId: s.threads.mainThreadId,
}));

api.threads.switchToThread(threadId);

api.threads.switchToNewThread();

const item = api.threads.item({ id: threadId });
item.rename("New Title");
item.archive();
item.delete();

Custom Thread List

import { ThreadListPrimitive, ThreadListItemPrimitive } from "@assistant-ui/react";

function CustomThreadList() {
  return (
    <ThreadListPrimitive.Root className="w-64">
      <ThreadListPrimitive.New className="w-full p-2 bg-blue-500 text-white">
        + New Chat
      </ThreadListPrimitive.New>

      <ThreadListPrimitive.Items>
        {() => (
          <ThreadListItemPrimitive.Root className="flex p-2 hover:bg-gray-100">
            <ThreadListItemPrimitive.Trigger className="flex-1">
              <ThreadListItemPrimitive.Title />
            </ThreadListItemPrimitive.Trigger>
            <ThreadListItemPrimitive.Archive>Archive</ThreadListItemPrimitive.Archive>
            <ThreadListItemPrimitive.Delete>Delete</ThreadListItemPrimitive.Delete>
          </ThreadListItemPrimitive.Root>
        )}
      </ThreadListPrimitive.Items>
    </ThreadListPrimitive.Root>
  );
}

Without Cloud (Local)

import {
  useRemoteThreadListRuntime,
  InMemoryThreadListAdapter,
} from "@assistant-ui/react";

const runtime = useRemoteThreadListRuntime({
  adapter: new InMemoryThreadListAdapter(),
  runtimeHook: () => useLocalRuntime({ model: myModel }),
});

Common Gotchas

ThreadList not showing

• Pass cloud to runtime
• Check authentication

Threads not persisting

• Verify cloud connection
• Check network requests