diff --git a/agentscope-extensions/agentscope-extensions-sandbox/agentscope-extensions-sandbox-e2b/src/main/java/io/agentscope/extensions/sandbox/e2b/E2bEnvdProcessClient.java b/agentscope-extensions/agentscope-extensions-sandbox/agentscope-extensions-sandbox-e2b/src/main/java/io/agentscope/extensions/sandbox/e2b/E2bEnvdProcessClient.java
index d8fb0b9dc0..7a43e3bcab 100644
--- a/agentscope-extensions/agentscope-extensions-sandbox/agentscope-extensions-sandbox-e2b/src/main/java/io/agentscope/extensions/sandbox/e2b/E2bEnvdProcessClient.java
+++ b/agentscope-extensions/agentscope-extensions-sandbox/agentscope-extensions-sandbox-e2b/src/main/java/io/agentscope/extensions/sandbox/e2b/E2bEnvdProcessClient.java
@@ -341,10 +341,11 @@ private DynamicMessage parseJsonStartResponse(byte[] data) throws IOException {
             DynamicMessage.Builder endBuilder = DynamicMessage.newBuilder(endDesc);
             Descriptors.FieldDescriptor exitCodeField = endDesc.findFieldByName("exit_code");
             JsonNode exitCodeNode = endNode.path("exitCode");
-            if (exitCodeNode.canConvertToInt()) {
+            boolean hasExitCode = exitCodeNode.canConvertToInt();
+            if (hasExitCode) {
                 endBuilder.setField(exitCodeField, exitCodeNode.intValue());
-                event.setField(processEventDesc.findFieldByName("end"), endBuilder.build());
             }
+            event.setField(processEventDesc.findFieldByName("end"), endBuilder.build());
         }
 
         if (!event.getAllFields().isEmpty()) {
diff --git a/agentscope-extensions/agentscope-extensions-sandbox/agentscope-extensions-sandbox-e2b/src/test/java/io/agentscope/extensions/sandbox/e2b/E2bEnvdProcessClientTest.java b/agentscope-extensions/agentscope-extensions-sandbox/agentscope-extensions-sandbox-e2b/src/test/java/io/agentscope/extensions/sandbox/e2b/E2bEnvdProcessClientTest.java
index 95d37d8dd5..4589877f01 100644
--- a/agentscope-extensions/agentscope-extensions-sandbox/agentscope-extensions-sandbox-e2b/src/test/java/io/agentscope/extensions/sandbox/e2b/E2bEnvdProcessClientTest.java
+++ b/agentscope-extensions/agentscope-extensions-sandbox/agentscope-extensions-sandbox-e2b/src/test/java/io/agentscope/extensions/sandbox/e2b/E2bEnvdProcessClientTest.java
@@ -148,7 +148,7 @@ void jsonCodecReturnsEmptyOutputsWhenOnlyEndPresent() throws Exception {
     }
 
     @Test
-    void jsonCodecPreservesZeroExitCode() throws Exception {
+    void jsonCodecPreservesSuccessfulExitCode() throws Exception {
         E2bEnvdProcessClient client = new E2bEnvdProcessClient(options(E2bCodec.JSON));
         ByteArrayOutputStream stdout = new ByteArrayOutputStream();
         ByteArrayOutputStream stderr = new ByteArrayOutputStream();
@@ -158,6 +158,17 @@ void jsonCodecPreservesZeroExitCode() throws Exception {
         assertEquals(0, exit);
     }
 
+    @Test
+    void jsonCodecTreatsEmptyEndEventAsSuccessfulExit() throws Exception {
+        E2bEnvdProcessClient client = new E2bEnvdProcessClient(options(E2bCodec.JSON));
+        ByteArrayOutputStream stdout = new ByteArrayOutputStream();
+        ByteArrayOutputStream stderr = new ByteArrayOutputStream();
+        int exit =
+                drainStartStream(client, connectFrame("{\"event\":{\"end\":{}}}"), stdout, stderr);
+
+        assertEquals(0, exit);
+    }
+
     private static DynamicMessage dataResponse(
             E2bEnvdProcessClient client, String stdout, String stderr) {
         Descriptors.FileDescriptor fd = client.fileDescriptor();