diff --git a/src/test/java/org/opensearch/flowframework/workflow/RegisterRemoteModelStepTests.java b/src/test/java/org/opensearch/flowframework/workflow/RegisterRemoteModelStepTests.java
index 1312d1638..603bfde57 100644
--- a/src/test/java/org/opensearch/flowframework/workflow/RegisterRemoteModelStepTests.java
+++ b/src/test/java/org/opensearch/flowframework/workflow/RegisterRemoteModelStepTests.java
@@ -36,6 +36,7 @@
 
 import static org.opensearch.action.DocWriteResponse.Result.UPDATED;
 import static org.opensearch.flowframework.common.CommonValue.DEPLOY_FIELD;
+import static org.opensearch.flowframework.common.CommonValue.INTERFACE_FIELD;
 import static org.opensearch.flowframework.common.CommonValue.REGISTER_MODEL_STATUS;
 import static org.opensearch.flowframework.common.CommonValue.WORKFLOW_STATE_INDEX;
 import static org.opensearch.flowframework.common.WorkflowResources.CONNECTOR_ID;
@@ -68,7 +69,11 @@ public void setUp() throws Exception {
                 Map.entry("function_name", "ignored"),
                 Map.entry("name", "xyz"),
                 Map.entry("description", "description"),
-                Map.entry(CONNECTOR_ID, "abcdefg")
+                Map.entry(CONNECTOR_ID, "abcdefg"),
+                Map.entry(
+                    INTERFACE_FIELD,
+                    "{\"output\":{\"properties\":{\"inference_results\":{\"description\":\"This is a test description field\",\"type\":\"array\",\"items\":{\"type\":\"object\",\"properties\":{\"output\":{\"description\":\"This is a test description field\",\"type\":\"array\",\"items\":{\"properties\":{\"name\":{\"description\":\"This is a test description field\",\"type\":\"string\"},\"dataAsMap\":{\"description\":\"This is a test description field\",\"type\":\"object\"}}}},\"status_code\":{\"description\":\"This is a test description field\",\"type\":\"integer\"}}}}}},\"input\":{\"properties\":{\"parameters\":{\"properties\":{\"messages\":{\"description\":\"This is a test description field\",\"type\":\"string\"}}}}}}"
+                )
             ),
             "test-id",
             "test-node-id"
@@ -205,6 +210,38 @@ public void testRegisterRemoteModelFailure() {
 
     }
 
+    public void testReisterRemoteModelInterfaceFailure() {
+        doAnswer(invocation -> {
+            ActionListener<MLRegisterModelResponse> actionListener = invocation.getArgument(1);
+            actionListener.onFailure(new IllegalArgumentException("Failed to register remote model"));
+            return null;
+        }).when(mlNodeClient).register(any(MLRegisterModelInput.class), any());
+
+        WorkflowData incorrectWorkflowData = new WorkflowData(
+            Map.ofEntries(
+                Map.entry("function_name", "ignored"),
+                Map.entry("name", "xyz"),
+                Map.entry("description", "description"),
+                Map.entry(CONNECTOR_ID, "abcdefg"),
+                Map.entry(INTERFACE_FIELD, "{\"output\":")
+            ),
+            "test-id",
+            "test-node-id"
+        );
+
+        PlainActionFuture<WorkflowData> future = this.registerRemoteModelStep.execute(
+            incorrectWorkflowData.getNodeId(),
+            incorrectWorkflowData,
+            Collections.emptyMap(),
+            Collections.emptyMap(),
+            Collections.emptyMap()
+        );
+        assertTrue(future.isDone());
+        ExecutionException ex = expectThrows(ExecutionException.class, () -> future.get().getClass());
+        assertTrue(ex.getCause() instanceof FlowFrameworkException);
+        assertEquals("Failed to create model interface", ex.getCause().getMessage());
+    }
+
     public void testRegisterRemoteModelUnSafeFailure() {
         doAnswer(invocation -> {
             ActionListener<MLRegisterModelResponse> actionListener = invocation.getArgument(1);