diff --git a/libs/langgraph-core/src/pregel/index.ts b/libs/langgraph-core/src/pregel/index.ts
index 88bf92f03..3bdaad837 100644
--- a/libs/langgraph-core/src/pregel/index.ts
+++ b/libs/langgraph-core/src/pregel/index.ts
@@ -2012,6 +2012,10 @@ export class Pregel<
       durability,
     ] = this._defaults(restConfig);
 
+    // Tag root run with LangGraph integration metadata, but don't override
+    // if already set (e.g. by downstream frameworks like DeepAgents)
+    config.metadata = { ls_integration: "langgraph", ...config.metadata };
+
     // At entrypoint, `configurable` is an alias for `context`.
     if (typeof config.context !== "undefined") {
       config.context = await this._validateContext(config.context);
diff --git a/libs/langgraph-core/src/tests/pregel.test.ts b/libs/langgraph-core/src/tests/pregel.test.ts
index fe3e1ebae..fd0527089 100644
--- a/libs/langgraph-core/src/tests/pregel.test.ts
+++ b/libs/langgraph-core/src/tests/pregel.test.ts
@@ -5351,7 +5351,7 @@ graph TD;
         payload: {
           config: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -5383,7 +5383,7 @@ graph TD;
         payload: {
           config: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -5393,7 +5393,7 @@ graph TD;
           },
           parentConfig: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -5451,7 +5451,7 @@ graph TD;
         payload: {
           config: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -5461,7 +5461,7 @@ graph TD;
           },
           parentConfig: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -5519,7 +5519,7 @@ graph TD;
         payload: {
           config: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -5529,7 +5529,7 @@ graph TD;
           },
           parentConfig: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -5587,7 +5587,7 @@ graph TD;
         payload: {
           config: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -5597,7 +5597,7 @@ graph TD;
           },
           parentConfig: {
             tags: [],
-            metadata: { thread_id: "10" },
+            metadata: { ls_integration: "langgraph", thread_id: "10" },
             recursion_limit: 25,
             configurable: {
               thread_id: "10",
@@ -9175,6 +9175,7 @@ graph TD;
           langgraph_checkpoint_ns: expect.stringMatching(/^p_one:/),
           __pregel_task_id: expect.any(String),
           checkpoint_ns: expect.stringMatching(/^p_one:/),
+          ls_integration: "langgraph",
           name: "p_one",
           tags: ["graph:step:1"],
         },
@@ -9191,6 +9192,7 @@ graph TD;
           langgraph_checkpoint_ns: expect.stringMatching(/^p_two:.*\|c_one:.*/),
           __pregel_task_id: expect.any(String),
           checkpoint_ns: expect.stringMatching(/^p_two:/),
+          ls_integration: "langgraph",
           name: "c_one",
           tags: ["graph:step:1"],
         },
@@ -9207,6 +9209,7 @@ graph TD;
           langgraph_checkpoint_ns: expect.stringMatching(/^p_two:.*\|c_one:.*/),
           __pregel_task_id: expect.any(String),
           checkpoint_ns: expect.stringMatching(/^p_two:/),
+          ls_integration: "langgraph",
           name: "c_one",
           tags: ["graph:step:1"],
         },
@@ -9223,6 +9226,7 @@ graph TD;
           langgraph_checkpoint_ns: expect.stringMatching(/^p_two:.*\|c_two:.*/),
           __pregel_task_id: expect.any(String),
           checkpoint_ns: expect.stringMatching(/^p_two:/),
+          ls_integration: "langgraph",
           ls_model_type: "chat",
           ls_provider: "FakeChatModel",
           ls_stop: undefined,
@@ -9243,6 +9247,7 @@ graph TD;
           langgraph_checkpoint_ns: expect.stringMatching(/^p_two:.*\|c_two:.*/),
           __pregel_task_id: expect.any(String),
           checkpoint_ns: expect.stringMatching(/^p_two:/),
+          ls_integration: "langgraph",
           ls_model_type: "chat",
           ls_provider: "FakeChatModel",
           ls_stop: undefined,
@@ -9263,6 +9268,7 @@ graph TD;
           langgraph_checkpoint_ns: expect.stringMatching(/^p_three/),
           __pregel_task_id: expect.any(String),
           checkpoint_ns: expect.stringMatching(/^p_three/),
+          ls_integration: "langgraph",
           ls_model_type: "chat",
           ls_provider: "FakeChatModel",
           ls_stop: undefined,
@@ -9293,8 +9299,21 @@ graph TD;
       )
     );
 
-    expect(streamedCombinedEvents).toMatchObject([
+    // The relative ordering of "custom" and "messages" events for the same
+    // chunk is non-deterministic across Node.js versions, so sort by mode
+    // before asserting (custom < messages alphabetically).
+    const sortedCombinedEvents = [...streamedCombinedEvents].sort((a, b) => {
+      const aMode = a[0] as string;
+      const bMode = b[0] as string;
+      if (aMode !== bMode) return aMode < bMode ? -1 : 1;
+      // within same mode, preserve original order by index
+      return (
+        streamedCombinedEvents.indexOf(a) - streamedCombinedEvents.indexOf(b)
+      );
+    });
+    expect(sortedCombinedEvents).toMatchObject([
       ["custom", { from: "parent" }],
+      ["custom", { from: "subgraph", content: "1" }],
       [
         "messages",
         [
@@ -9307,6 +9326,7 @@ graph TD;
             langgraph_checkpoint_ns: expect.stringMatching(/^p_one:/),
             __pregel_task_id: expect.any(String),
             checkpoint_ns: expect.stringMatching(/^p_one:/),
+            ls_integration: "langgraph",
             name: "p_one",
             tags: ["graph:step:1"],
           },
@@ -9325,6 +9345,7 @@ graph TD;
               expect.stringMatching(/^p_two:.*\|c_one:.*/),
             __pregel_task_id: expect.any(String),
             checkpoint_ns: expect.stringMatching(/^p_two:/),
+            ls_integration: "langgraph",
             name: "c_one",
             tags: ["graph:step:1"],
           },
@@ -9343,6 +9364,7 @@ graph TD;
               expect.stringMatching(/^p_two:.*\|c_one:.*/),
             __pregel_task_id: expect.any(String),
             checkpoint_ns: expect.stringMatching(/^p_two:/),
+            ls_integration: "langgraph",
             name: "c_one",
             tags: ["graph:step:1"],
           },
@@ -9361,6 +9383,7 @@ graph TD;
               expect.stringMatching(/^p_two:.*\|c_two:.*/),
             __pregel_task_id: expect.any(String),
             checkpoint_ns: expect.stringMatching(/^p_two:/),
+            ls_integration: "langgraph",
             ls_model_type: "chat",
             ls_provider: "FakeChatModel",
             ls_stop: undefined,
@@ -9369,7 +9392,6 @@ graph TD;
           },
         ],
       ],
-      ["custom", { from: "subgraph", content: "1" }],
       [
         "messages",
         [
@@ -9383,6 +9405,7 @@ graph TD;
               expect.stringMatching(/^p_two:.*\|c_two:.*/),
             __pregel_task_id: expect.any(String),
             checkpoint_ns: expect.stringMatching(/^p_two:/),
+            ls_integration: "langgraph",
             ls_model_type: "chat",
             ls_provider: "FakeChatModel",
             ls_stop: undefined,
@@ -9402,6 +9425,7 @@ graph TD;
             langgraph_checkpoint_ns: expect.stringMatching(/^p_three/),
             __pregel_task_id: expect.any(String),
             checkpoint_ns: expect.stringMatching(/^p_three/),
+            ls_integration: "langgraph",
             ls_model_type: "chat",
             ls_provider: "FakeChatModel",
             ls_stop: undefined,
diff --git a/libs/langgraph-core/src/tests/tracing.test.ts b/libs/langgraph-core/src/tests/tracing.test.ts
index 1165d5d16..8d1079d5c 100644
--- a/libs/langgraph-core/src/tests/tracing.test.ts
+++ b/libs/langgraph-core/src/tests/tracing.test.ts
@@ -48,7 +48,7 @@ it("stream events for a multi-node graph", async () => {
       name: "LangGraph",
       tags: [],
       run_id: expect.any(String),
-      metadata: {},
+      metadata: { ls_integration: "langgraph" },
     },
     {
       event: "on_chain_start",
@@ -260,7 +260,7 @@ it("stream events for a multi-node graph", async () => {
       run_id: expect.any(String),
       name: "LangGraph",
       tags: [],
-      metadata: {},
+      metadata: { ls_integration: "langgraph" },
       data: {
         chunk: {
           testnode: {
@@ -279,7 +279,7 @@ it("stream events for a multi-node graph", async () => {
       run_id: expect.any(String),
       name: "LangGraph",
       tags: [],
-      metadata: {},
+      metadata: { ls_integration: "langgraph" },
     },
   ]);
 });
@@ -391,7 +391,7 @@ it("Should respect .withConfig", async () => {
       name: "OVERRIDDEN_NAME",
       tags: [],
       run_id: expect.any(String),
-      metadata: {},
+      metadata: { ls_integration: "langgraph" },
     },
     {
       event: "on_chain_start",
@@ -603,7 +603,7 @@ it("Should respect .withConfig", async () => {
       run_id: expect.any(String),
       name: "OVERRIDDEN_NAME",
       tags: [],
-      metadata: {},
+      metadata: { ls_integration: "langgraph" },
       data: {
         chunk: {
           testnode: {
@@ -622,7 +622,7 @@ it("Should respect .withConfig", async () => {
       run_id: expect.any(String),
       name: "OVERRIDDEN_NAME",
       tags: [],
-      metadata: {},
+      metadata: { ls_integration: "langgraph" },
     },
   ]);
 });