From 952017fbe2e76033d6eba66895fe531be8e20797 Mon Sep 17 00:00:00 2001
From: Arjun Natarajan <arjun@langchain.dev>
Date: Mon, 2 Jun 2025 17:17:07 -0700
Subject: [PATCH] feat: support custom tracer when creating run in ts sdk

---
 libs/sdk-js/src/client.ts | 2 ++
 libs/sdk-js/src/types.ts  | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/libs/sdk-js/src/client.ts b/libs/sdk-js/src/client.ts
index 14ae37583..ab9962e73 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/${threadId}/runs`, {
@@ -1059,6 +1060,7 @@ export class RunsClient<
       after_seconds: payload?.afterSeconds,
       if_not_exists: payload?.ifNotExists,
       checkpoint_during: payload?.checkpointDuring,
+      langsmith_tracer: payload?._langsmithTracer,
     };
     const endpoint =
       threadId == null ? `/runs/wait` : `/threads/${threadId}/runs/wait`;
diff --git a/libs/sdk-js/src/types.ts b/libs/sdk-js/src/types.ts
index f9588f890..77050bed8 100644
--- a/libs/sdk-js/src/types.ts
+++ b/libs/sdk-js/src/types.ts
@@ -140,6 +140,15 @@ 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?: {
+    project_name: string;
+    example_id: string;
+  };
 }
 
 export interface RunsStreamPayload<