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assistant-ui/primitives

Erstellt und passt assistant-ui Chat-Oberflächen aus zusammensetzbaren, ungestylten @assistant-ui/react Primitiven, die dem Radix-Stil folgen.

Was ist primitives?

Diese Fertigkeit (Skill) ermöglicht es Entwicklern, benutzerdefinierte Chat-Oberflächen mit dem assistant-ui Framework zu bauen, indem sie sich auf niedrigstufige, zusammensetzbare Primitive von @assistant-ui/react stützen, die nach dem Radix-Part-Kompositionsmuster gestaltet sind. Sie ist ideal für diejenigen, die nicht die vorgefertigte Drop-in-Lösung verwenden möchten, sondern die volle Kontrolle über die UI-Struktur und das Styling von Komponenten wie Thread, Composer, Nachrichtenanzeige, Aktionsleiste oder Verzweigungsauswahl benötigen. Die Primitiven werden ohne integrierte Styles ausgeliefert, was maximale Flexibilität für benutzerdefiniertes CSS oder Tailwind bietet. Sie deckt alle wichtigen Bausteine ab, einschließlich ThreadPrimitive (Root, Viewport, Messages, Empty, ScrollToBottom), ComposerPrimitive, MessagePrimitive, ActionBarPrimitive und mehr. Darüber hinaus wird die Handhabung von Rendering-Funktionen für Text, Bilder, Reasoning und Tool-Calls sowie die bedingte Anzeige behandelt. Für einen schnellen Start mit vorgefertigter UI oder eine Multi-Thread-Seitenleiste existieren separate Skills wie `setup` oder `thread-list`.

Funktioniert mit~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/assistant-ui/skills/tree/main/skills/primitives

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Dokumentation

Was macht primitives?

Erstellt und passt assistant-ui Chat-Oberflächen aus zusammensetzbaren, ungestylten @assistant-ui/react Primitiven an, die dem Radix-Stil folgen. Verwenden Sie dies, wenn Sie einen benutzerdefinierten Thread, Composer, Nachrichtenanzeige, Aktionsleiste oder Verzweigungsauswahl aus Bausteinen zusammenbauen oder stylen möchten: ThreadPrimitive (.Root, .Viewport, .Messages, .Empty, .ScrollToBottom), ComposerPrimitive (.Input, .Send, .Cancel, .Attachments), MessagePrimitive (.Parts/.Content, .Error), ActionBarPrimitive (.Copy, .Edit, .Reload, .Speak, Feedback, .ExportMarkdown), BranchPickerPrimitive, AttachmentPrimitive, ThreadListPrimitive, ThreadListItemPrimitive. Behandelt auch MessagePrimitive.Parts Kinder-Render-Funktionen für Text-, Bild-, Reasoning- und Tool-Call-Teile; bedingtes Rendering mit AuiIf (veraltet .If); und Besonderheiten wie das Einwickeln in AssistantRuntimeProvider und das Hinzufügen von className, da die Primitiven ungestylt ausgeliefert werden. Für vorgefertigte Drop-in-UI und Scaffolding verwenden Sie setup; für Multi-Thread-Seitenleistenverhalten verwenden Sie thread-list.

Individual skills in this repo

This repo contains 7 individual skills — each has its own dedicated page.

assistant-ui/assistant-ui

Overview and router for assistant-ui, the React library for building AI chat interfaces from composable primitives. Use for high-level, cross-cutting, or architecture-overview questions: choosing packages, picking a runtime, or understanding the layered model (RuntimeCore, Runtime, context hooks, primitives) and message model. Covers the `@assistant-ui/react` core plus `@assistant-ui/react-ai-sdk`, `@assistant-ui/react-langgraph`, `assistant-stream`, and `assistant-cloud`; `AssistantRuntimeProvider`; the primitives `ThreadPrimitive`, `MessagePrimitive`, `ComposerPrimitive`; the hooks `useAui`, `useAuiState`, `useAuiEvent`; and runtime selection across `useChatRuntime`, `useExternalStoreRuntime`, `useLangGraphRuntime`, `useLocalRuntime`. For a specific area route to a focused sibling instead: setup, runtime, primitives, tools, streaming, cloud, thread-list, or update. Not for hands-on tasks already owned by those siblings.

assistant-ui/runtime

Guide for assistant-ui runtime system and state management. Use when working with runtimes, accessing state, or managing thread/message data.

assistant-ui/setup

Installs and configures assistant-ui in a project via the CLI, and picks the right runtime for a backend. Use for first-time install, scaffold, or config: `npx assistant-ui@latest create my-app` (templates default, minimal, cloud, cloud-clerk, langgraph, mcp), `npx assistant-ui@latest init [--yes] [--overwrite]` in an existing Next.js app, or `npx assistant-ui@latest add` registry components (markdown-text, thread-list). Also use to choose a runtime hook for a backend: useChatRuntime (AI SDK), useLangGraphRuntime, useAgUiRuntime, useA2ARuntime, useLocalRuntime (custom streaming API), or useExternalStoreRuntime (Redux/Zustand). Covers Vite/TanStack Start setup, shadcn styling, the playground --preset flag, and avoiding the deprecated @assistant-ui/styles and @assistant-ui/react-ui packages. For upgrading an existing install or post-upgrade breakage use update; for building UI from raw parts use primitives.

assistant-ui/streaming

Streaming backends and wire protocols for assistant-ui via the assistant-stream package. Use when building a custom (non-AI-SDK) streaming endpoint with createAssistantStreamResponse or createAssistantStreamController, emitting parts through appendText/appendReasoning/appendSource/appendFile/addToolCallPart and setResponse; choosing between the AI SDK Data Stream format (toUIMessageStreamResponse) and the native Assistant Transport format; encoding or decoding streams with DataStreamEncoder/DataStreamDecoder, AssistantTransportEncoder/AssistantTransportDecoder, PlainTextEncoder, or UIMessageStreamDecoder; or wiring streamed chunks into useLocalRuntime or useChatRuntime. Use specifically for debugging stream wire issues: text-delta, part-start, result events, text/event-stream content-type, SSE format, tool calls not rendering, or partial text not showing. For general non-stream debugging route to the relevant focused skill, not the parent overview.

assistant-ui/thread-list

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.

assistant-ui/tools

Registers LLM tools and renders custom tool-call UI in assistant-ui (@assistant-ui/react). Use when adding frontend-only tools with makeAssistantTool / useAssistantTool (browser actions like clipboard, navigation, localStorage, async-generator streaming, AbortSignal), rendering backend AI SDK tool() calls with makeAssistantToolUI / useAssistantToolUI (status.type running/complete/incomplete/requires-action, args, result, artifact via ToolCallMessagePartProps), building generative UI from tool results, or implementing human-in-the-loop and approval flows (addResult, resume with context.human(), respondToApproval for server-side needsApproval gates). Covers registering tool components inside AssistantRuntimeProvider and the case-sensitive toolName matching that connects a tool to its UI. Reach for this when tool UI is not rendering, a tool is not being called, or a result is not showing.

assistant-ui/update

Upgrades an existing assistant-ui project to current releases and executes the resulting migrations. Use when the user wants to update, upgrade, bump, or migrate @assistant-ui/react, @assistant-ui/react-ai-sdk, ai, or @ai-sdk/react, hits peer-dependency conflicts or post-upgrade type errors, or must apply renamed APIs after a version jump. Detects installed versus latest versions via npm ls / npm view, then routes through breaking-change references for each jump (AI SDK v4/v5 to v6; assistant-ui 0.8.x to 0.14.x): useAssistantApi to useAui, runtime.threadList to runtime.threads, ThreadPrimitive.ViewportSlack removal, the primitives components prop to children render functions, toDataStreamResponse to toUIMessageStreamResponse, maxSteps to stopWhen: stepCountIs(n). Runs npx assistant-ui@latest upgrade, pnpm/npm add @latest, and npx tsc --noEmit to verify. For a first-time install or fresh scaffold (not an upgrade) use setup instead.

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