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assistant-ui/assistant-ui

assistant-ui の概要とルーター。React ライブラリで、合成可能なプリミティブからAIチャットインターフェースを構築します。

assistant-ui とは？

このスキルは、assistant-ui の包括的な概要を提供します。assistant-ui は、React を使用して AI チャットインターフェースを構築するためのライブラリであり、再利用可能なプリミティブから構成されます。主に、パッケージの選択、ランタイムの選定、階層モデル（RuntimeCore、Runtime、コンテキストフック、プリミティブ）やメッセージモデルの理解など、高レベルかつ横断的なアーキテクチャの質問に回答します。対応範囲は、`@assistant-ui/react` コアライブラリに加え、`@assistant-ui/react-ai-sdk`、`@assistant-ui/react-langgraph`、`assistant-stream`、`assistant-cloud` の各パッケージ、`AssistantRuntimeProvider`、プリミティブ（`ThreadPrimitive`、`MessagePrimitive`、`ComposerPrimitive`）、フック（`useAui`、`useAuiState`、`useAuiEvent`）、およびランタイム選択（`useChatRuntime`、`useExternalStoreRuntime`、`useLangGraphRuntime`、`useLocalRuntime`）を含みます。特定の領域（セットアップ、ランタイム、プリミティブ、ツール、ストリーミング、クラウド、スレッドリスト、アップデート）に関する実践的なタスクは、それぞれの専用スキルにルーティングします。

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Part ofDesign & UI
npx skills add https://github.com/assistant-ui/skills/tree/main/skills/assistant-ui
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ドキュメント

assistant-ui は何をしますか？

assistant-ui の概要とルーター。assistant-ui は、合成可能なプリミティブからAIチャットインターフェースを構築するためのReactライブラリです。パッケージの選択、ランタイムの選定、階層モデル（RuntimeCore、Runtime、コンテキストフック、プリミティブ）やメッセージモデルの理解など、高レベルかつ横断的な、またはアーキテクチャ全体に関する質問に使用します。以下をカバーします：@assistant-ui/react コアと、@assistant-ui/react-ai-sdk、@assistant-ui/react-langgraph、assistant-stream、assistant-cloud；AssistantRuntimeProvider；プリミティブ ThreadPrimitive、MessagePrimitive、ComposerPrimitive；フック useAui、useAuiState、useAuiEvent；およびランタイム選択（useChatRuntime、useExternalStoreRuntime、useLangGraphRuntime、useLocalRuntime）。特定の領域については、代わりに専用の関連スキルにルーティングしてください：セットアップ、ランタイム、プリミティブ、ツール、ストリーミング、クラウド、スレッドリスト、またはアップデート。これらの関連スキルが担当する実践的なタスクは対象外です。

Individual skills in this repo

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

assistant-ui/primitives

Builds and customizes assistant-ui chat UI from composable, unstyled @assistant-ui/react primitives that follow Radix-style part composition. Use when assembling or styling a custom Thread, Composer, message rendering, action bar, or branch picker from building blocks: 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. Covers MessagePrimitive.Parts children render functions for text, image, reasoning, and tool-call parts; conditional rendering with AuiIf (deprecated .If); and gotchas like wrapping in AssistantRuntimeProvider and adding className since primitives ship unstyled. For prebuilt drop-in UI and scaffolding use setup; for multi-thread sidebar behavior use thread-list.

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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