sdk patch: raise errors on update/create examples when passing mismat…

…ching length sequences (#1238)

python/langsmith/client.py

@@ -3413,6 +3413,22 @@ def create_examples(
 
         if dataset_id is None:
             dataset_id = self.read_dataset(dataset_name=dataset_name).id
+
+        sequence_args = {
+            "outputs": outputs,
+            "metadata": metadata,
+            "splits": splits,
+            "ids": ids,
+            "source_run_ids": source_run_ids,
+        }
+        # Since inputs are required, we will check against them
+        input_len = len(inputs)
+        for arg_name, arg_value in sequence_args.items():
+            if arg_value is not None and len(arg_value) != input_len:
+                raise ValueError(
+                    f"Length of {arg_name} ({len(arg_value)}) does not match"
+                    f" length of inputs ({input_len})"
+                )
         examples = [
             {
                 "inputs": in_,
@@ -3816,6 +3832,21 @@ def update_examples(
         Dict[str, Any]
             The response from the server (specifies the number of examples updated).
         """
+        sequence_args = {
+            "inputs": inputs,
+            "outputs": outputs,
+            "metadata": metadata,
+            "splits": splits,
+            "dataset_ids": dataset_ids,
+        }
+        # Since inputs are required, we will check against them
+        examples_len = len(example_ids)
+        for arg_name, arg_value in sequence_args.items():
+            if arg_value is not None and len(arg_value) != examples_len:
+                raise ValueError(
+                    f"Length of {arg_name} ({len(arg_value)}) does not match"
+                    f" length of examples ({examples_len})"
+                )
         examples = [
             {
                 "id": id_,

python/tests/integration_tests/test_client.py

@@ -1018,3 +1018,44 @@ def create_encoder(*args, **kwargs):
                 myobj["key_1"]
 
         assert not caplog.records
+
+
+def test_examples_length_validation(langchain_client: Client) -> None:
+    """Test that mismatched lengths raise ValueError for create and update examples."""
+    dataset_name = "__test_examples_length_validation" + uuid4().hex[:4]
+    dataset = langchain_client.create_dataset(dataset_name=dataset_name)
+
+    # Test create_examples validation
+    inputs = [{"text": "hello"}, {"text": "world"}]
+    outputs = [{"response": "hi"}]  # One less than inputs
+    with pytest.raises(ValueError) as exc_info:
+        langchain_client.create_examples(
+            inputs=inputs, outputs=outputs, dataset_id=dataset.id
+        )
+    assert "Length of outputs (1) does not match length of inputs (2)" in str(
+        exc_info.value
+    )
+
+    # Create some valid examples for testing update
+    langchain_client.create_examples(
+        inputs=[{"text": "hello"}, {"text": "world"}],
+        outputs=[{"response": "hi"}, {"response": "earth"}],
+        dataset_id=dataset.id,
+    )
+    example_ids = [
+        example.id for example in langchain_client.list_examples(dataset_id=dataset.id)
+    ]
+
+    # Test update_examples validation
+    with pytest.raises(ValueError) as exc_info:
+        langchain_client.update_examples(
+            example_ids=example_ids,
+            inputs=[{"text": "new hello"}],  # One less than example_ids
+            outputs=[{"response": "new hi"}, {"response": "new earth"}],
+        )
+    assert "Length of inputs (1) does not match length of examples (2)" in str(
+        exc_info.value
+    )
+
+    # Clean up
+    langchain_client.delete_dataset(dataset_id=dataset.id)