diff --git a/libs/sdk-js/src/client.ts b/libs/sdk-js/src/client.ts
index 14ae37583..d48322880 100644
--- a/libs/sdk-js/src/client.ts
+++ b/libs/sdk-js/src/client.ts
@@ -979,6 +979,7 @@ export class RunsClient<
       after_seconds: payload?.afterSeconds,
       if_not_exists: payload?.ifNotExists,
       checkpoint_during: payload?.checkpointDuring,
+      langsmith_tracer: payload?._langsmithTracer,
     };
 
     const [run, response] = await this.fetch<Run>(`/threads/${threadId}/runs`, {
@@ -1059,6 +1060,12 @@ export class RunsClient<
       after_seconds: payload?.afterSeconds,
       if_not_exists: payload?.ifNotExists,
       checkpoint_during: payload?.checkpointDuring,
+      langsmith_tracer: payload?._langsmithTracer
+        ? {
+            project_name: payload?._langsmithTracer?.projectName,
+            example_id: payload?._langsmithTracer?.exampleId,
+          }
+        : undefined,
     };
     const endpoint =
       threadId == null ? `/runs/wait` : `/threads/${threadId}/runs/wait`;
diff --git a/libs/sdk-js/src/index.ts b/libs/sdk-js/src/index.ts
index 00978a121..4318bbfc0 100644
--- a/libs/sdk-js/src/index.ts
+++ b/libs/sdk-js/src/index.ts
@@ -2,51 +2,55 @@ export { Client, getApiKey } from "./client.js";
 export type { ClientConfig, RequestHook } from "./client.js";
 
 export type {
-  AssistantBase,
   Assistant,
-  AssistantVersion,
+  AssistantBase,
   AssistantGraph,
+  AssistantVersion,
+  Checkpoint,
   Config,
+  Cron,
+  CronCreateForThreadResponse,
+  CronCreateResponse,
   DefaultValues,
   GraphSchema,
+  Interrupt,
+  Item,
+  ListNamespaceResponse,
   Metadata,
   Run,
-  Thread,
-  ThreadTask,
-  ThreadState,
-  ThreadStatus,
-  Cron,
-  Checkpoint,
-  Interrupt,
-  ListNamespaceResponse,
-  Item,
   SearchItem,
   SearchItemsResponse,
-  CronCreateResponse,
-  CronCreateForThreadResponse,
+  Thread,
+  ThreadState,
+  ThreadStatus,
+  ThreadTask,
 } from "./schema.js";
 export { overrideFetchImplementation } from "./singletons/fetch.js";
 
-export type { OnConflictBehavior, Command } from "./types.js";
-export type { StreamMode } from "./types.stream.js";
 export type {
-  ValuesStreamEvent,
+  Command,
+  OnConflictBehavior,
+  RunsInvokePayload,
+} from "./types.js";
+export type {
+  AIMessage,
+  FunctionMessage,
+  HumanMessage,
+  Message,
+  RemoveMessage,
+  SystemMessage,
+  ToolMessage,
+} from "./types.messages.js";
+export type {
+  CustomStreamEvent,
+  DebugStreamEvent,
+  ErrorStreamEvent,
+  EventsStreamEvent,
+  FeedbackStreamEvent,
+  MessagesStreamEvent,
   MessagesTupleStreamEvent,
   MetadataStreamEvent,
+  StreamMode,
   UpdatesStreamEvent,
-  CustomStreamEvent,
-  MessagesStreamEvent,
-  DebugStreamEvent,
-  EventsStreamEvent,
-  ErrorStreamEvent,
-  FeedbackStreamEvent,
+  ValuesStreamEvent,
 } from "./types.stream.js";
-export type {
-  Message,
-  HumanMessage,
-  AIMessage,
-  ToolMessage,
-  SystemMessage,
-  FunctionMessage,
-  RemoveMessage,
-} from "./types.messages.js";
diff --git a/libs/sdk-js/src/types.ts b/libs/sdk-js/src/types.ts
index f9588f890..743f714b3 100644
--- a/libs/sdk-js/src/types.ts
+++ b/libs/sdk-js/src/types.ts
@@ -1,3 +1,4 @@
+import { LangChainTracer } from "@langchain/core/tracers/tracer_langchain";
 import { Checkpoint, Config, Metadata } from "./schema.js";
 import { StreamMode } from "./types.stream.js";
 
@@ -41,7 +42,7 @@ export interface Command {
   goto?: Send | Send[] | string | string[];
 }
 
-interface RunsInvokePayload {
+export interface RunsInvokePayload {
   /**
    * Input to the run. Pass `null` to resume from the current state of the thread.
    */
@@ -140,6 +141,12 @@ interface RunsInvokePayload {
    * Callback when a run is created.
    */
   onRunCreated?: (params: { run_id: string; thread_id?: string }) => void;
+
+  /**
+   * @internal
+   * For LangSmith tracing purposes only. Not part of the public API.
+   */
+  _langsmithTracer?: LangChainTracer;
 }
 
 export interface RunsStreamPayload<