# useStream > @langchain/react → useStream [`useStream`](#index.useStream) is the root hook of `@langchain/react`. Mount it once per thread. It owns the thread lifecycle, the transport, and a handful of always-on projections (`values`, `messages`, `toolCalls`, `interrupts`, `error`, `isLoading`, discovery maps). > **Learn more:** New to the SDK? Start with **Getting started**. For UI patterns, see the [LangChain frontend documentation](https://docs.langchain.com/oss/javascript/langchain/frontend/overview). > **Runnable example:** The [`ui-react`](https://github.com/langchain-ai/streaming-cookbook/tree/main/typescript/ui-react) app in the [streaming cookbook](https://github.com/langchain-ai/streaming-cookbook) is a complete `useStream` chat with reconnect and replay. ## Options The option bag is a discriminated union on `transport`: - **Agent Server** (default) — omit `transport`, or pass `"sse"` / `"websocket"`. Requires `assistantId` + `apiUrl` (or a pre-built `client`). - **Custom adapter** — pass an `AgentServerAdapter` instance. The hook delegates every command and subscription to the adapter. See [**Transports**](./transports). ### Common options | Option | Type | Description | | --------------- | ---------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------- | | `assistantId` | `string` | Assistant/graph ID. Required on the Agent Server branch; optional (defaults to `"_"`) on the custom-adapter branch. | | `threadId` | `string \| null` | Bind to an existing thread. Pass `null` to start a new thread on next submit; changing the value hydrates and resubscribes. | | `initialValues` | `StateType` | Initial state values used until the first `values` event lands. | | `messagesKey` | `string` | State key holding the message array. Defaults to `"messages"`. | | `onThreadId` | `(id: string) => void` | Fires when the server mints a new thread id. | | `onCreated` | `(info: { runId: string }) => void` | Fired when this hook's run is accepted by the server. | | `onCompleted` | `(info: { runId?: string; reason: "success" \| "error" \| "interrupt" \| "stopped" }) => void` | Fired when a run's active streaming phase ends. `runId` may be omitted for re-attached in-flight runs. | | `tools` | `HeadlessToolImplementation[]` | Headless tools. Matching interrupts are auto-resolved with the handler's return value. See **Interrupts**. | | `onTool` | `OnToolCallback` | Observe headless-tool lifecycle events (`start` / `success` / `error`). | | `optimistic` | `boolean` | Optimistic input echo, reconciled by id. Defaults to `true`; set `false` for server-authoritative-only. | For details, see [**Migration: optimistic updates**](./migration#54-optimistic-updates-replaces-optimisticvalues). ### Agent Server branch ([`AgentServerOptions`](#index.AgentServerOptions)) | Option | Type | Description | | --------------------------------- | ---------------------------- | -------------------------------------------------- | | `apiUrl` | `string` | Base URL of the LangGraph-compatible agent server. | | `client` | `Client` | Pre-built SDK client (alternative to `apiUrl`). | | `apiKey` | `string` | API key forwarded to the built-in client. | | `callerOptions`, `defaultHeaders` | `ClientConfig[...]` | Forwarded to the built-in client. | | `transport` | `"sse" \| "websocket"` | Built-in wire transport. Defaults to `"sse"`. | | `fetch` | `typeof fetch` | Optional `fetch` override for the SSE transport. | | `webSocketFactory` | `(url: string) => WebSocket` | Optional WebSocket factory for the WS transport. | ### Custom-adapter branch ([`CustomAdapterOptions`](#index.CustomAdapterOptions)) | Option | Type | Description | | ----------- | -------------------- | ----------------------------------------------------------------- | | `transport` | `AgentServerAdapter` | Adapter instance. Replaces the built-in transport stack entirely. | Passing `apiUrl` / `apiKey` / `fetch` / `webSocketFactory` on the custom-adapter branch is a compile-time error. ## Return values | Property | Type | Description | | ------------------------------------- | ----------------------------------------------------------- | ------------------------------------------------------------------------------------------------------- | | `values` | `StateType` | Latest root `values`-channel snapshot (falls back to `initialValues ?? {}`). | | `messages` | `BaseMessage[]` | Root message projection; merges `messages`-channel deltas and `values.messages` snapshots. | | `toolCalls` | `AssembledToolCall[]` | Tool calls assembled from the root run; each carries `status`, `args`, `result`, `aiMessageId`. | | `interrupt` / `interrupts` | `Interrupt \| Interrupt[]` | Most-recent root interrupt and the full interrupt list. | | `isLoading` | `boolean` | True while a run is in flight or initial hydration hasn't completed. | | `isThreadLoading` | `boolean` | True during the initial thread-hydration lifecycle. | | `hydrationPromise` | `Promise` | Settles when the active thread's initial hydrate resolves. Used by `useSuspenseStream`. | | `error` | `unknown` | Latest transport or hydrate error. | | `threadId` | `string \| null` | Currently bound thread id. | | `subagents` | `ReadonlyMap` | Discovery snapshots for subagents on the thread (identity only — no messages / tool calls). | | `subgraphs` | `ReadonlyMap` | Subgraphs discovered on the run. | | `subgraphsByNode` | `ReadonlyMap` | Same snapshots keyed by the graph node that produced them. | | `submit(input, options?)` | function | Dispatch a new run on the bound thread. | | `stop(options?)` | `(options?: { cancel?: boolean }) => Promise` | Cancel the active run (default) and disconnect. Pass `{ cancel: false }` to disconnect only. | | `disconnect()` | `() => Promise` | Disconnect the client without cancelling the run (`stop({ cancel: false })`). | | `respond(response, options?)` | function | Resume a single interrupt with a response payload (target via `options.interruptId` / `namespace`). | | `respondAll(responsesById, options?)` | function | Resume several interrupts pending at the same checkpoint in one command (`interruptId` → response map). | | `getThread()` | `() => ThreadStream \| undefined` | Returns the bound `ThreadStream` for low-level protocol access; `undefined` until a thread is bound. | | `client` | `Client` | The bound client (`HttpAgentServerAdapter`'s client on the custom branch). | | `assistantId` | `string` | Resolved assistant id (including the `"_"` fallback on custom adapters). | ## `submit()` options `submit()` accepts `Partial` as input (`messages` is widened to also accept `BaseMessage` class instances, or a single message). To resume a pending interrupt, use `stream.respond()` instead. | Option | Type | Description | | ----------------------------------- | ---------------------------------------------------- | ----------------------------------------------------------------------------------------------------------- | | `config` | `{ configurable?, tags?, recursion_limit?, ... }` | Run config forwarded to the server. | | `metadata` | `Record` | Run metadata. | | `multitaskStrategy` | `"rollback" \| "interrupt" \| "reject" \| "enqueue"` | How to handle a submit while a run is active. See **Submission queue**. | | `forkFrom` | `string` | Fork the new run from a specific checkpoint id (edit / retry flows). See **Fork & edit from a checkpoint**. | | `interruptBefore`, `interruptAfter` | `string[]` | Breakpoint debugging. | | `runId` | `string` | Pre-generate a run id (for optimistic UI / telemetry). | | `durability` | `"async" \| "sync" \| "exit"` | Checkpoint policy. | | `context` | `unknown` | Runtime context (distinct from `config.configurable`). | | `feedbackKeys` | `string[]` | LangSmith integration. | | `threadId` | `string` | Per-submit thread override — rebinds the hook to `threadId` before dispatching. | | `onError` | `(error: unknown) => void` | Per-submit error callback. The transport-level `stream.error` store update still happens. | ## Stopping a run and responding to interrupts ### `stop()` `stream.stop()` cancels the active run by default: it disconnects the client transport, calls `client.runs.cancel` on the server, and sets `isLoading` to `false`. Messages and values received so far are preserved. Safe to call unconditionally — when no run is active it is a no-op. ```tsx ``` Pass `{ cancel: false }` to disconnect without cancelling server-side execution, or use `stream.disconnect()`. ### `disconnect()` `stream.disconnect()` is an alias for `stop({ cancel: false })`. Use it in join/rejoin UIs where the agent should keep running after the client leaves the stream. ### `respond(response, options?)` Resume a single pending interrupt. When `options.interruptId` is omitted, `respond()` walks `stream.getThread()?.interrupts` from newest to oldest and resumes the first entry not yet resolved by a prior `respond()` call. Safe when exactly one interrupt is pending; otherwise pass `options.interruptId` (and `options.namespace` for subgraph interrupts). See **Interrupts**. ```tsx // Single pending interrupt — omit target: await stream.respond({ approved: true }); // Multiple root interrupts — target by id: await stream.respond({ approved: true }, { interruptId: myInterrupt.id! }); // Carry run config + metadata onto the resume: await stream.respond( { approved: true }, { config: { configurable: { model: "gpt-4o" } }, metadata: { source: "ui" } }, ); ``` ### `respondAll(responsesById, options?)` Resume several interrupts pending at the same checkpoint (e.g. parallel tool-authorization prompts) in a single command. `responsesById` maps each pending `interruptId` to its response; namespaces are resolved internally from `getThread()?.interrupts`. ```tsx await stream.respondAll({ [interruptA.id]: { approved: true }, [interruptB.id]: { approved: false }, }); ``` ### `hydrationPromise` `stream.hydrationPromise` settles when the thread's initial hydration resolves (or rejects). A fresh promise is installed every time the hook binds to a new `threadId`. `useSuspenseStream` leans on this directly; in plain `useStream` apps you rarely need it. ## API reference ## Classes - [`HttpAgentServerAdapter`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapter) - [`MediaAssemblyError`](https://reference.langchain.com/javascript/langchain-react/MediaAssemblyError) ## Functions - [`applyHeadlessToolResumeCommand()`](https://reference.langchain.com/javascript/langchain-react/applyHeadlessToolResumeCommand) - [`executeHeadlessTool()`](https://reference.langchain.com/javascript/langchain-react/executeHeadlessTool) - [`filterOutHeadlessToolInterrupts()`](https://reference.langchain.com/javascript/langchain-react/filterOutHeadlessToolInterrupts) - [`findHeadlessTool()`](https://reference.langchain.com/javascript/langchain-react/findHeadlessTool) - [`flushPendingHeadlessToolInterrupts()`](https://reference.langchain.com/javascript/langchain-react/flushPendingHeadlessToolInterrupts) - [`handleHeadlessToolInterrupt()`](https://reference.langchain.com/javascript/langchain-react/handleHeadlessToolInterrupt) - [`headlessToolResumeCommand()`](https://reference.langchain.com/javascript/langchain-react/headlessToolResumeCommand) - [`isHeadlessToolInterrupt()`](https://reference.langchain.com/javascript/langchain-react/isHeadlessToolInterrupt) - [`parseHeadlessToolInterruptPayload()`](https://reference.langchain.com/javascript/langchain-react/parseHeadlessToolInterruptPayload) - [`StreamProvider()`](https://reference.langchain.com/javascript/langchain-react/StreamProvider) - [`useAudio()`](https://reference.langchain.com/javascript/langchain-react/useAudio) - [`useAudioPlayer()`](https://reference.langchain.com/javascript/langchain-react/useAudioPlayer) - [`useChannel()`](https://reference.langchain.com/javascript/langchain-react/useChannel) - [`useChannelEffect()`](https://reference.langchain.com/javascript/langchain-react/useChannelEffect) - [`useExtension()`](https://reference.langchain.com/javascript/langchain-react/useExtension) - [`useFiles()`](https://reference.langchain.com/javascript/langchain-react/useFiles) - [`useImages()`](https://reference.langchain.com/javascript/langchain-react/useImages) - [`useMediaURL()`](https://reference.langchain.com/javascript/langchain-react/useMediaURL) - [`useMessageMetadata()`](https://reference.langchain.com/javascript/langchain-react/useMessageMetadata) - [`useMessages()`](https://reference.langchain.com/javascript/langchain-react/useMessages) - [`useProjection()`](https://reference.langchain.com/javascript/langchain-react/useProjection) - [`useStream()`](https://reference.langchain.com/javascript/langchain-react/useStream) - [`useStreamContext()`](https://reference.langchain.com/javascript/langchain-react/useStreamContext) - [`useSubmissionQueue()`](https://reference.langchain.com/javascript/langchain-react/useSubmissionQueue) - [`useSuspenseStream()`](https://reference.langchain.com/javascript/langchain-react/useSuspenseStream) - [`useToolCalls()`](https://reference.langchain.com/javascript/langchain-react/useToolCalls) - [`useValues()`](https://reference.langchain.com/javascript/langchain-react/useValues) - [`useVideo()`](https://reference.langchain.com/javascript/langchain-react/useVideo) - [`useVideoPlayer()`](https://reference.langchain.com/javascript/langchain-react/useVideoPlayer) ## Interfaces - [`AgentServerAdapter`](https://reference.langchain.com/javascript/langchain-react/AgentServerAdapter) - [`AssembledToolCall`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall) - [`AudioMedia`](https://reference.langchain.com/javascript/langchain-react/AudioMedia) - [`AudioPlayerHandle`](https://reference.langchain.com/javascript/langchain-react/AudioPlayerHandle) - [`FileMedia`](https://reference.langchain.com/javascript/langchain-react/FileMedia) - [`FlushPendingHeadlessToolInterruptsOptions`](https://reference.langchain.com/javascript/langchain-react/FlushPendingHeadlessToolInterruptsOptions) - [`HeadlessToolImplementation`](https://reference.langchain.com/javascript/langchain-react/HeadlessToolImplementation) - [`HeadlessToolInterrupt`](https://reference.langchain.com/javascript/langchain-react/HeadlessToolInterrupt) - [`HttpAgentServerAdapterOptions`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions) - [`ImageMedia`](https://reference.langchain.com/javascript/langchain-react/ImageMedia) - [`MediaBase`](https://reference.langchain.com/javascript/langchain-react/MediaBase) - [`MessageMetadata`](https://reference.langchain.com/javascript/langchain-react/MessageMetadata) - [`StreamStopOptions`](https://reference.langchain.com/javascript/langchain-react/StreamStopOptions) - [`StreamSubmitOptions`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions) - [`SubagentDiscoverySnapshot`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot) - [`SubgraphDiscoverySnapshot`](https://reference.langchain.com/javascript/langchain-react/SubgraphDiscoverySnapshot) - [`SubmissionQueueEntry`](https://reference.langchain.com/javascript/langchain-react/SubmissionQueueEntry) - [`ToolEvent`](https://reference.langchain.com/javascript/langchain-react/ToolEvent) - [`UseAudioPlayerOptions`](https://reference.langchain.com/javascript/langchain-react/UseAudioPlayerOptions) - [`UseChannelEffectOptions`](https://reference.langchain.com/javascript/langchain-react/UseChannelEffectOptions) - [`UseStreamReturn`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn) - [`UseSubmissionQueueReturn`](https://reference.langchain.com/javascript/langchain-react/UseSubmissionQueueReturn) - [`UseVideoPlayerOptions`](https://reference.langchain.com/javascript/langchain-react/UseVideoPlayerOptions) - [`VideoMedia`](https://reference.langchain.com/javascript/langchain-react/VideoMedia) - [`VideoPlayerHandle`](https://reference.langchain.com/javascript/langchain-react/VideoPlayerHandle) ## Types - [`AgentServerOptions`](https://reference.langchain.com/javascript/langchain-react/AgentServerOptions) - [`AnyHeadlessToolImplementation`](https://reference.langchain.com/javascript/langchain-react/AnyHeadlessToolImplementation) - [`AnyMediaHandle`](https://reference.langchain.com/javascript/langchain-react/AnyMediaHandle) - [`AnyStream`](https://reference.langchain.com/javascript/langchain-react/AnyStream) - [`CustomAdapterOptions`](https://reference.langchain.com/javascript/langchain-react/CustomAdapterOptions) - [`DefaultToolCall`](https://reference.langchain.com/javascript/langchain-react/DefaultToolCall) - [`InferStateType`](https://reference.langchain.com/javascript/langchain-react/InferStateType) - [`InferSubagentStates`](https://reference.langchain.com/javascript/langchain-react/InferSubagentStates) - [`InferToolCalls`](https://reference.langchain.com/javascript/langchain-react/InferToolCalls) - [`InferToolOutput`](https://reference.langchain.com/javascript/langchain-react/InferToolOutput) - [`MediaAssemblyErrorKind`](https://reference.langchain.com/javascript/langchain-react/MediaAssemblyErrorKind) - [`MediaBlockType`](https://reference.langchain.com/javascript/langchain-react/MediaBlockType) - [`MessageMetadataMap`](https://reference.langchain.com/javascript/langchain-react/MessageMetadataMap) - [`OnToolCallback`](https://reference.langchain.com/javascript/langchain-react/OnToolCallback) - [`PlayerStatus`](https://reference.langchain.com/javascript/langchain-react/PlayerStatus) - [`SelectorTarget`](https://reference.langchain.com/javascript/langchain-react/SelectorTarget) - [`StreamProviderCustomProps`](https://reference.langchain.com/javascript/langchain-react/StreamProviderCustomProps) - [`StreamProviderProps`](https://reference.langchain.com/javascript/langchain-react/StreamProviderProps) - [`SubmissionQueueSnapshot`](https://reference.langchain.com/javascript/langchain-react/SubmissionQueueSnapshot) - [`ToolCallFromTool`](https://reference.langchain.com/javascript/langchain-react/ToolCallFromTool) - [`ToolCallsFromTools`](https://reference.langchain.com/javascript/langchain-react/ToolCallsFromTools) - [`ToolCallState`](https://reference.langchain.com/javascript/langchain-react/ToolCallState) - [`ToolCallStatus`](https://reference.langchain.com/javascript/langchain-react/ToolCallStatus) - [`ToolCallWithResult`](https://reference.langchain.com/javascript/langchain-react/ToolCallWithResult) - [`UseStreamOptions`](https://reference.langchain.com/javascript/langchain-react/UseStreamOptions) - [`UseStreamResult`](https://reference.langchain.com/javascript/langchain-react/UseStreamResult) - [`UseSuspenseStreamReturn`](https://reference.langchain.com/javascript/langchain-react/UseSuspenseStreamReturn) - [`WidenUpdateMessages`](https://reference.langchain.com/javascript/langchain-react/WidenUpdateMessages) ## Constants - [`apiUrl`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapter/apiUrl) - [`getState`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapter/getState) - [`threadId`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapter/threadId) - [`cause`](https://reference.langchain.com/javascript/langchain-react/MediaAssemblyError/cause) - [`kind`](https://reference.langchain.com/javascript/langchain-react/MediaAssemblyError/kind) - [`messageId`](https://reference.langchain.com/javascript/langchain-react/MediaAssemblyError/messageId) - [`partialBytes`](https://reference.langchain.com/javascript/langchain-react/MediaAssemblyError/partialBytes) - [`threadId`](https://reference.langchain.com/javascript/langchain-react/AgentServerAdapter/threadId) - [`args`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/args) - [`callId`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/callId) - [`error`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/error) - [`id`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/id) - [`input`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/input) - [`name`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/name) - [`namespace`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/namespace) - [`output`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/output) - [`status`](https://reference.langchain.com/javascript/langchain-react/AssembledToolCall/status) - [`blob`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/blob) - [`error`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/error) - [`id`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/id) - [`messageId`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/messageId) - [`mimeType`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/mimeType) - [`monotonic`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/monotonic) - [`namespace`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/namespace) - [`node`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/node) - [`objectURL`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/objectURL) - [`partialBytes`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/partialBytes) - [`stream`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/stream) - [`transcript`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/transcript) - [`type`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/type) - [`url`](https://reference.langchain.com/javascript/langchain-react/AudioMedia/url) - [`currentTime`](https://reference.langchain.com/javascript/langchain-react/AudioPlayerHandle/currentTime) - [`duration`](https://reference.langchain.com/javascript/langchain-react/AudioPlayerHandle/duration) - [`error`](https://reference.langchain.com/javascript/langchain-react/AudioPlayerHandle/error) - [`level`](https://reference.langchain.com/javascript/langchain-react/AudioPlayerHandle/level) - [`status`](https://reference.langchain.com/javascript/langchain-react/AudioPlayerHandle/status) - [`strategy`](https://reference.langchain.com/javascript/langchain-react/AudioPlayerHandle/strategy) - [`blob`](https://reference.langchain.com/javascript/langchain-react/FileMedia/blob) - [`error`](https://reference.langchain.com/javascript/langchain-react/FileMedia/error) - [`filename`](https://reference.langchain.com/javascript/langchain-react/FileMedia/filename) - [`id`](https://reference.langchain.com/javascript/langchain-react/FileMedia/id) - [`messageId`](https://reference.langchain.com/javascript/langchain-react/FileMedia/messageId) - [`mimeType`](https://reference.langchain.com/javascript/langchain-react/FileMedia/mimeType) - [`monotonic`](https://reference.langchain.com/javascript/langchain-react/FileMedia/monotonic) - [`namespace`](https://reference.langchain.com/javascript/langchain-react/FileMedia/namespace) - [`node`](https://reference.langchain.com/javascript/langchain-react/FileMedia/node) - [`objectURL`](https://reference.langchain.com/javascript/langchain-react/FileMedia/objectURL) - [`partialBytes`](https://reference.langchain.com/javascript/langchain-react/FileMedia/partialBytes) - [`stream`](https://reference.langchain.com/javascript/langchain-react/FileMedia/stream) - [`type`](https://reference.langchain.com/javascript/langchain-react/FileMedia/type) - [`url`](https://reference.langchain.com/javascript/langchain-react/FileMedia/url) - [`defer`](https://reference.langchain.com/javascript/langchain-react/FlushPendingHeadlessToolInterruptsOptions/defer) - [`onTool`](https://reference.langchain.com/javascript/langchain-react/FlushPendingHeadlessToolInterruptsOptions/onTool) - [`resumeSubmit`](https://reference.langchain.com/javascript/langchain-react/FlushPendingHeadlessToolInterruptsOptions/resumeSubmit) - [`execute`](https://reference.langchain.com/javascript/langchain-react/HeadlessToolImplementation/execute) - [`tool`](https://reference.langchain.com/javascript/langchain-react/HeadlessToolImplementation/tool) - [`toolCall`](https://reference.langchain.com/javascript/langchain-react/HeadlessToolInterrupt/toolCall) - [`type`](https://reference.langchain.com/javascript/langchain-react/HeadlessToolInterrupt/type) - [`apiUrl`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions/apiUrl) - [`asyncCaller`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions/asyncCaller) - [`defaultHeaders`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions/defaultHeaders) - [`fetch`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions/fetch) - [`onRequest`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions/onRequest) - [`paths`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions/paths) - [`threadId`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions/threadId) - [`webSocketFactory`](https://reference.langchain.com/javascript/langchain-react/HttpAgentServerAdapterOptions/webSocketFactory) - [`blob`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/blob) - [`error`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/error) - [`height`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/height) - [`id`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/id) - [`messageId`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/messageId) - [`mimeType`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/mimeType) - [`monotonic`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/monotonic) - [`namespace`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/namespace) - [`node`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/node) - [`objectURL`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/objectURL) - [`partialBytes`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/partialBytes) - [`stream`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/stream) - [`type`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/type) - [`url`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/url) - [`width`](https://reference.langchain.com/javascript/langchain-react/ImageMedia/width) - [`blob`](https://reference.langchain.com/javascript/langchain-react/MediaBase/blob) - [`error`](https://reference.langchain.com/javascript/langchain-react/MediaBase/error) - [`id`](https://reference.langchain.com/javascript/langchain-react/MediaBase/id) - [`messageId`](https://reference.langchain.com/javascript/langchain-react/MediaBase/messageId) - [`mimeType`](https://reference.langchain.com/javascript/langchain-react/MediaBase/mimeType) - [`monotonic`](https://reference.langchain.com/javascript/langchain-react/MediaBase/monotonic) - [`namespace`](https://reference.langchain.com/javascript/langchain-react/MediaBase/namespace) - [`node`](https://reference.langchain.com/javascript/langchain-react/MediaBase/node) - [`objectURL`](https://reference.langchain.com/javascript/langchain-react/MediaBase/objectURL) - [`partialBytes`](https://reference.langchain.com/javascript/langchain-react/MediaBase/partialBytes) - [`stream`](https://reference.langchain.com/javascript/langchain-react/MediaBase/stream) - [`url`](https://reference.langchain.com/javascript/langchain-react/MediaBase/url) - [`optimisticStatus`](https://reference.langchain.com/javascript/langchain-react/MessageMetadata/optimisticStatus) - [`parentCheckpointId`](https://reference.langchain.com/javascript/langchain-react/MessageMetadata/parentCheckpointId) - [`cancel`](https://reference.langchain.com/javascript/langchain-react/StreamStopOptions/cancel) - [`_stateType`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions/_stateType) - [`config`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions/config) - [`forkFrom`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions/forkFrom) - [`metadata`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions/metadata) - [`multitaskStrategy`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions/multitaskStrategy) - [`onError`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions/onError) - [`signal`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions/signal) - [`threadId`](https://reference.langchain.com/javascript/langchain-react/StreamSubmitOptions/threadId) - [`completedAt`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/completedAt) - [`depth`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/depth) - [`error`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/error) - [`id`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/id) - [`name`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/name) - [`namespace`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/namespace) - [`output`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/output) - [`parentId`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/parentId) - [`startedAt`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/startedAt) - [`status`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/status) - [`taskInput`](https://reference.langchain.com/javascript/langchain-react/SubagentDiscoverySnapshot/taskInput) - [`completedAt`](https://reference.langchain.com/javascript/langchain-react/SubgraphDiscoverySnapshot/completedAt) - [`id`](https://reference.langchain.com/javascript/langchain-react/SubgraphDiscoverySnapshot/id) - [`namespace`](https://reference.langchain.com/javascript/langchain-react/SubgraphDiscoverySnapshot/namespace) - [`nodeName`](https://reference.langchain.com/javascript/langchain-react/SubgraphDiscoverySnapshot/nodeName) - [`startedAt`](https://reference.langchain.com/javascript/langchain-react/SubgraphDiscoverySnapshot/startedAt) - [`status`](https://reference.langchain.com/javascript/langchain-react/SubgraphDiscoverySnapshot/status) - [`createdAt`](https://reference.langchain.com/javascript/langchain-react/SubmissionQueueEntry/createdAt) - [`id`](https://reference.langchain.com/javascript/langchain-react/SubmissionQueueEntry/id) - [`options`](https://reference.langchain.com/javascript/langchain-react/SubmissionQueueEntry/options) - [`values`](https://reference.langchain.com/javascript/langchain-react/SubmissionQueueEntry/values) - [`args`](https://reference.langchain.com/javascript/langchain-react/ToolEvent/args) - [`duration`](https://reference.langchain.com/javascript/langchain-react/ToolEvent/duration) - [`error`](https://reference.langchain.com/javascript/langchain-react/ToolEvent/error) - [`name`](https://reference.langchain.com/javascript/langchain-react/ToolEvent/name) - [`phase`](https://reference.langchain.com/javascript/langchain-react/ToolEvent/phase) - [`result`](https://reference.langchain.com/javascript/langchain-react/ToolEvent/result) - [`autoPlay`](https://reference.langchain.com/javascript/langchain-react/UseAudioPlayerOptions/autoPlay) - [`pcm`](https://reference.langchain.com/javascript/langchain-react/UseAudioPlayerOptions/pcm) - [`pcmMimePrefixes`](https://reference.langchain.com/javascript/langchain-react/UseAudioPlayerOptions/pcmMimePrefixes) - [`strategy`](https://reference.langchain.com/javascript/langchain-react/UseAudioPlayerOptions/strategy) - [`bufferSize`](https://reference.langchain.com/javascript/langchain-react/UseChannelEffectOptions/bufferSize) - [`enabled`](https://reference.langchain.com/javascript/langchain-react/UseChannelEffectOptions/enabled) - [`onError`](https://reference.langchain.com/javascript/langchain-react/UseChannelEffectOptions/onError) - [`onEvent`](https://reference.langchain.com/javascript/langchain-react/UseChannelEffectOptions/onEvent) - [`replay`](https://reference.langchain.com/javascript/langchain-react/UseChannelEffectOptions/replay) - [`target`](https://reference.langchain.com/javascript/langchain-react/UseChannelEffectOptions/target) - [`assistantId`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/assistantId) - [`client`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/client) - [`error`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/error) - [`hydrationPromise`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/hydrationPromise) - [`interrupt`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/interrupt) - [`interrupts`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/interrupts) - [`isLoading`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/isLoading) - [`isThreadLoading`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/isThreadLoading) - [`messages`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/messages) - [`subagents`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/subagents) - [`subgraphs`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/subgraphs) - [`subgraphsByNode`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/subgraphsByNode) - [`threadId`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/threadId) - [`toolCalls`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/toolCalls) - [`values`](https://reference.langchain.com/javascript/langchain-react/UseStreamReturn/values) - [`entries`](https://reference.langchain.com/javascript/langchain-react/UseSubmissionQueueReturn/entries) - [`size`](https://reference.langchain.com/javascript/langchain-react/UseSubmissionQueueReturn/size) - [`autoPlay`](https://reference.langchain.com/javascript/langchain-react/UseVideoPlayerOptions/autoPlay) - [`blob`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/blob) - [`error`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/error) - [`id`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/id) - [`messageId`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/messageId) - [`mimeType`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/mimeType) - [`monotonic`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/monotonic) - [`namespace`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/namespace) - [`node`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/node) - [`objectURL`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/objectURL) - [`partialBytes`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/partialBytes) - [`stream`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/stream) - [`type`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/type) - [`url`](https://reference.langchain.com/javascript/langchain-react/VideoMedia/url) - [`currentTime`](https://reference.langchain.com/javascript/langchain-react/VideoPlayerHandle/currentTime) - [`duration`](https://reference.langchain.com/javascript/langchain-react/VideoPlayerHandle/duration) - [`error`](https://reference.langchain.com/javascript/langchain-react/VideoPlayerHandle/error) - [`status`](https://reference.langchain.com/javascript/langchain-react/VideoPlayerHandle/status) - [`args`](https://reference.langchain.com/javascript/langchain-react/DefaultToolCall/args) - [`id`](https://reference.langchain.com/javascript/langchain-react/DefaultToolCall/id) - [`name`](https://reference.langchain.com/javascript/langchain-react/DefaultToolCall/name) - [`type`](https://reference.langchain.com/javascript/langchain-react/DefaultToolCall/type) - [`STREAM_CONTROLLER`](https://reference.langchain.com/javascript/langchain-react/STREAM_CONTROLLER)