app/components/Assistant.client.vue wires the thread with AISDKChat() from @assistant-ui/ai-sdk: the AI SDK chat runs as the threads scope of the assistant client, no React host required. Edit, reload, and branch switching come with it.
server/api/chat.post.ts runs streamText over convertToModelMessages and returns the AI SDK UI message stream, exactly like the Next.js templates; the default AssistantChatTransport posts the UIMessage array to /api/chat.
app/components/Assistant.client.vue mounts the provider client-only. AuiProvider creates its client in component setup, and Vue SSR never disposes effect scopes, so rendering it on the server would leak one runtime per request.
React is a small runtime dependency of the AI SDK integration: @assistant-ui/tap installs its hook dispatcher while the chat resource renders, so useChat's React hook calls route to tap and React never renders anything.
Messages render as plain text. @assistant-ui/vue has no markdown renderer yet.

Run

cp .env.example .env   # set OPENAI_API_KEY
pnpm install
pnpm dev

pnpm install runs nuxt prepare, which generates the .nuxt/ directory that tsconfig.json extends.