perhaps better typing

libs/sdk-js/src/client.ts

@@ -1060,7 +1060,12 @@ export class RunsClient<
       after_seconds: payload?.afterSeconds,
       if_not_exists: payload?.ifNotExists,
       checkpoint_during: payload?.checkpointDuring,
-      langsmith_tracer: payload?._langsmithTracer,
+      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`;

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";
 
@@ -145,10 +146,7 @@ interface RunsInvokePayload {
    * @internal
    * For LangSmith tracing purposes only. Not part of the public API.
    */
-  _langsmithTracer?: {
-    project_name: string;
-    example_id: string;
-  };
+  _langsmithTracer?: LangChainTracer;
 }
 
 export interface RunsStreamPayload<