From 886fa382380c92515fdacdfe762acf2bbdb3a2d1 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Wed, 24 Sep 2025 18:13:25 -0700
Subject: [PATCH 01/12] Add in data loader and pulling from tags

---
 eval_protocol/adapters/langfuse.py            |  46 ++++++--
 eval_protocol/pytest/evaluation_test.py       |  47 ++++++--
 .../pytest/remote_rollout_processor.py        |  22 +++-
 eval_protocol/pytest/rollout_processor.py     |   8 ++
 eval_protocol/pytest/utils.py                 |  28 +++--
 tests/chinook/langfuse/remote_server.py       |   7 ++
 .../langfuse/test_remote_langfuse_chinook.py  | 103 ++++--------------
 7 files changed, 151 insertions(+), 110 deletions(-)

diff --git a/eval_protocol/adapters/langfuse.py b/eval_protocol/adapters/langfuse.py
index 9b630178..675ce1ea 100644
--- a/eval_protocol/adapters/langfuse.py
+++ b/eval_protocol/adapters/langfuse.py
@@ -12,7 +12,7 @@
 from typing import Any, Dict, List, Optional, Protocol, TYPE_CHECKING, cast
 
 from langfuse.api.resources.commons.types.observations_view import ObservationsView
-from eval_protocol.models import EvaluationRow, InputMetadata, Message
+from eval_protocol.models import EvaluationRow, InputMetadata, ExecutionMetadata, Message
 from .base import BaseAdapter
 from .utils import extract_messages_from_data
 
@@ -82,14 +82,44 @@ def convert_trace_to_evaluation_row(
         if not messages:
             return None
 
+        execution_metadata = ExecutionMetadata()
+        row_id = None
+
+        if trace.observations:
+            for obs in trace.observations:
+                if obs.metadata and "requester_metadata" in obs.metadata:
+                    req_meta = obs.metadata["requester_metadata"]
+                    if isinstance(req_meta, dict):
+                        execution_metadata.invocation_id = req_meta.get("invocation_id")
+                        execution_metadata.experiment_id = req_meta.get("experiment_id")
+                        execution_metadata.rollout_id = req_meta.get("rollout_id")
+                        execution_metadata.run_id = req_meta.get("run_id")
+                        row_id = req_meta.get("row_id")
+                    break  # Only need to get first observation
+
+        if trace.tags:
+            for tag in trace.tags:
+                if tag.startswith("invocation_id:") and not execution_metadata.invocation_id:
+                    execution_metadata.invocation_id = tag.split(":", 1)[1]
+                elif tag.startswith("experiment_id:") and not execution_metadata.experiment_id:
+                    execution_metadata.experiment_id = tag.split(":", 1)[1]
+                elif tag.startswith("rollout_id:") and not execution_metadata.rollout_id:
+                    execution_metadata.rollout_id = tag.split(":", 1)[1]
+                elif tag.startswith("run_id:") and not execution_metadata.run_id:
+                    execution_metadata.run_id = tag.split(":", 1)[1]
+                elif tag.startswith("row_id:") and not row_id:
+                    row_id = tag.split(":", 1)[1]
+
         return EvaluationRow(
             messages=messages,
             tools=tools,
             input_metadata=InputMetadata(
+                row_id=row_id,
                 session_data={
                     "langfuse_trace_id": trace.id,  # Store the trace ID here
-                }
+                },
             ),
+            execution_metadata=execution_metadata,
         )
 
     except (AttributeError, ValueError, KeyError) as e:
@@ -332,16 +362,18 @@ def get_evaluation_rows(
                         to_timestamp=to_timestamp,
                         order_by="timestamp.desc",
                     )
+
+                    # If no results, possible due to indexing delay--remote rollout processor just finished pushing rows to Langfuse
+                    if traces and hasattr(traces, "meta") and traces.meta.total_items == 0 and page == 1:
+                        raise Exception("Empty results - indexing delay")
+
                     break
                 except Exception as e:
                     list_retries += 1
-                    if "429" in str(e) and list_retries < max_retries:
+                    if list_retries < max_retries and ("429" in str(e) or "Empty results" in str(e)):
                         sleep_time = 2**list_retries  # Exponential backoff
                         logger.warning(
-                            "Rate limit hit on trace.list(), retrying in %ds (attempt %d/%d)",
-                            sleep_time,
-                            list_retries,
-                            max_retries,
+                            "Retrying in %ds (attempt %d/%d): %s", sleep_time, list_retries, max_retries, str(e)
                         )
                         time.sleep(sleep_time)
                     else:
diff --git a/eval_protocol/pytest/evaluation_test.py b/eval_protocol/pytest/evaluation_test.py
index d9dfe811..d0de8ea0 100644
--- a/eval_protocol/pytest/evaluation_test.py
+++ b/eval_protocol/pytest/evaluation_test.py
@@ -402,15 +402,33 @@ async def _execute_groupwise_eval_with_semaphore(
                                 return results
 
                         if mode == "pointwise":
-                            # Pointwise mode, rollouts will return as they complete so we can pipeline evaluation_test execution
                             pointwise_tasks: list[asyncio.Task[EvaluationRow]] = []
-                            # Use wrapper that handles retry logic internally
-                            async for row in rollout_processor_with_retry(
-                                rollout_processor, fresh_dataset, config, run_idx
-                            ):
-                                pointwise_tasks.append(
-                                    asyncio.create_task(_execute_pointwise_eval_with_semaphore(row=row))
-                                )
+
+                            if rollout_processor.supports_pipelining:
+                                # Pointwise mode, rollouts will return as they complete so we can pipeline evaluation_test execution
+                                # Use wrapper that handles retry logic internally
+                                async for row in rollout_processor_with_retry(
+                                    rollout_processor, fresh_dataset, config, run_idx
+                                ):
+                                    pointwise_tasks.append(
+                                        asyncio.create_task(_execute_pointwise_eval_with_semaphore(row=row))
+                                    )
+                            else:
+                                # Non-pipelined mode: collect all rollout results first, then postprocess, then evaluate
+                                collected_rollout_rows: list[EvaluationRow] = []
+                                async for row in rollout_processor_with_retry(
+                                    rollout_processor, fresh_dataset, config, run_idx
+                                ):
+                                    collected_rollout_rows.append(row)
+
+                                # Post-process rollout results to get evaluation inputs
+                                eval_input_rows = rollout_processor.postprocess(collected_rollout_rows)
+
+                                # Now evaluate all the post-processed rows
+                                for row in eval_input_rows:
+                                    pointwise_tasks.append(
+                                        asyncio.create_task(_execute_pointwise_eval_with_semaphore(row=row))
+                                    )
 
                             # Run evaluation tasks with progress bar
                             results = await run_tasks_with_eval_progress(pointwise_tasks, run_idx)
@@ -453,9 +471,13 @@ async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParamete
                                     lst.append(copied_row)  # pyright: ignore[reportUnknownMemberType]
                                 tasks.append(asyncio.create_task(_collect_result(config, lst)))  # pyright: ignore[reportUnknownArgumentType]
                             rollout_results = await asyncio.gather(*tasks)
-                            for result in rollout_results:
-                                for row in result:
-                                    row_groups[row.input_metadata.row_id].append(row)  # pyright: ignore[reportUnknownMemberType]
+
+                            # Flatten and postprocess all rollout results
+                            all_rollout_rows = [row for result in rollout_results for row in result]
+                            processed_rows = rollout_processor.postprocess(all_rollout_rows)
+
+                            for row in processed_rows:
+                                row_groups[row.input_metadata.row_id].append(row)
                             tasks = []
                             for _, rows in row_groups.items():  # pyright: ignore[reportUnknownVariableType]
                                 tasks.append(asyncio.create_task(_execute_groupwise_eval_with_semaphore(rows=rows)))  # pyright: ignore[reportUnknownArgumentType]
@@ -471,6 +493,9 @@ async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParamete
                                 rollout_processor, fresh_dataset, config, run_idx
                             ):
                                 input_dataset.append(row)  # pyright: ignore[reportUnknownMemberType]
+
+                            input_dataset = rollout_processor.postprocess(input_dataset)
+
                             # NOTE: we will still evaluate errored rows (give users control over this)
                             # i.e., they can choose to give EvaluateResult.score = 0 for errored rows in their test_func
                             results = await execute_pytest(
diff --git a/eval_protocol/pytest/remote_rollout_processor.py b/eval_protocol/pytest/remote_rollout_processor.py
index 04963f0d..4f0e102c 100644
--- a/eval_protocol/pytest/remote_rollout_processor.py
+++ b/eval_protocol/pytest/remote_rollout_processor.py
@@ -1,10 +1,11 @@
 import asyncio
 import time
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, List, Optional, Callable
 
 import requests
 
 from eval_protocol.models import EvaluationRow
+from eval_protocol.data_loader.dynamic_data_loader import DynamicDataLoader
 from .rollout_processor import RolloutProcessor
 from .types import RolloutProcessorConfig
 
@@ -35,6 +36,8 @@ class RemoteRolloutProcessor(RolloutProcessor):
       Returns: {"terminated": bool, "info": {...}?}
     """
 
+    supports_pipelining: bool = False  # Remote rollout processor cannot pipeline - must wait for all rollouts to complete before fetching results.
+
     def __init__(
         self,
         *,
@@ -42,6 +45,7 @@ def __init__(
         num_turns: int = 2,
         poll_interval: float = 1.0,
         timeout_seconds: float = 120.0,
+        output_data_loader: Callable[[str], DynamicDataLoader],
     ):
         # Prefer constructor-provided configuration. These can be overridden via
         # config.kwargs at call time for backward compatibility.
@@ -49,6 +53,7 @@ def __init__(
         self._num_turns = num_turns
         self._poll_interval = poll_interval
         self._timeout_seconds = timeout_seconds
+        self._output_data_loader = output_data_loader
 
     def __call__(self, rows: List[EvaluationRow], config: RolloutProcessorConfig) -> List[asyncio.Task[EvaluationRow]]:
         tasks: List[asyncio.Task[EvaluationRow]] = []
@@ -158,5 +163,20 @@ def _get_status() -> Dict[str, Any]:
 
         return tasks
 
+    def postprocess(self, finished_rollout_rows: List[EvaluationRow]) -> List[EvaluationRow]:
+        """Fetch actual evaluation rows from Langfuse using the output_data_loader."""
+        invocation_id = finished_rollout_rows[0].execution_metadata.invocation_id
+        if not invocation_id:
+            raise ValueError("Invocation ID is required in RemoteRolloutProcessor")
+
+        data_loader = self._output_data_loader(invocation_id)
+
+        results = data_loader.load()
+        output_rows: List[EvaluationRow] = []
+        for result in results:
+            output_rows.extend(result.rows)
+
+        return output_rows
+
     def cleanup(self) -> None:
         return None
diff --git a/eval_protocol/pytest/rollout_processor.py b/eval_protocol/pytest/rollout_processor.py
index 313f1768..5389b1c6 100644
--- a/eval_protocol/pytest/rollout_processor.py
+++ b/eval_protocol/pytest/rollout_processor.py
@@ -10,11 +10,19 @@ class RolloutProcessor(ABC):
     Abstract base class for all rollout processor strategies.
     """
 
+    supports_pipelining: bool = (
+        True  # Whether this processor supports pipelined evaluation (evaluate rows as rollouts complete)
+    )
+
     @abstractmethod
     def __call__(self, rows: list[EvaluationRow], config: RolloutProcessorConfig) -> list[asyncio.Task[EvaluationRow]]:
         """Process evaluation rows and return async tasks. Must be implemented by subclasses."""
         pass
 
+    def postprocess(self, finished_rollout_rows: list[EvaluationRow]) -> list[EvaluationRow]:
+        """Post-process rollout results to produce evaluation inputs. Only available for processors that return False from supports_pipelining."""
+        return finished_rollout_rows
+
     def cleanup(self) -> None:
         """Cleanup resources. Override in subclasses if cleanup is needed."""
         pass
diff --git a/eval_protocol/pytest/utils.py b/eval_protocol/pytest/utils.py
index 4e9be951..4ac472ef 100644
--- a/eval_protocol/pytest/utils.py
+++ b/eval_protocol/pytest/utils.py
@@ -4,7 +4,7 @@
 import re
 import sys
 from dataclasses import replace
-from typing import Any, Literal
+from typing import Any, Literal, Callable, AsyncGenerator
 
 from litellm.cost_calculator import cost_per_token
 from tqdm import tqdm
@@ -33,7 +33,9 @@
 AggregationMethod = Literal["mean", "max", "min", "bootstrap"]
 
 
-async def run_tasks_with_eval_progress(pointwise_tasks: list, run_idx: int):
+async def run_tasks_with_eval_progress(
+    pointwise_tasks: list[asyncio.Task[EvaluationRow]], run_idx: int
+) -> list[EvaluationRow]:
     """
     Run evaluation tasks with a progress bar and proper cancellation handling.
 
@@ -58,7 +60,7 @@ async def run_tasks_with_eval_progress(pointwise_tasks: list, run_idx: int):
         bar_format="{desc}: {percentage:3.0f}%|{bar}| {n_fmt}/{total_fmt} [{elapsed}<{remaining}, {rate_fmt}]",
     ) as eval_pbar:
 
-        async def task_with_progress(task):
+        async def task_with_progress(task: asyncio.Task[EvaluationRow]) -> EvaluationRow:
             try:
                 result = await task
                 return result
@@ -77,7 +79,9 @@ async def task_with_progress(task):
             raise
 
 
-async def run_tasks_with_run_progress(execute_run_func, num_runs, config):
+async def run_tasks_with_run_progress(
+    execute_run_func: Callable[[int, RolloutProcessorConfig], Any], num_runs: int, config: RolloutProcessorConfig
+) -> None:
     """
     Run tasks with a parallel runs progress bar, preserving original logic.
 
@@ -98,12 +102,12 @@ async def run_tasks_with_run_progress(execute_run_func, num_runs, config):
         bar_format="{desc}: {percentage:3.0f}%|{bar}| {n_fmt}/{total_fmt} [{elapsed}<{remaining}, {rate_fmt}]",
     ) as run_pbar:
 
-        async def execute_run_with_progress(run_idx: int, config):
+        async def execute_run_with_progress(run_idx: int, config: RolloutProcessorConfig) -> Any:
             result = await execute_run_func(run_idx, config)
             run_pbar.update(1)
             return result
 
-        tasks = []
+        tasks: list[asyncio.Task[Any]] = []
         for run_idx in range(num_runs):
             tasks.append(asyncio.create_task(execute_run_with_progress(run_idx, config)))
         try:
@@ -274,7 +278,7 @@ async def rollout_processor_with_retry(
     fresh_dataset: list[EvaluationRow],
     config: RolloutProcessorConfig,
     run_idx: int = 0,
-):
+) -> AsyncGenerator[EvaluationRow, None]:
     """
     Wrapper around rollout_processor that handles retry logic using the Python backoff library.
 
@@ -304,13 +308,13 @@ async def rollout_processor_with_retry(
 
         # Create a single backoff-decorated retry function that can be reused
         @exception_config.get_backoff_decorator()  # pyright: ignore[reportUntypedFunctionDecorator]
-        async def execute_row_with_backoff_retry(row: EvaluationRow):
+        async def execute_row_with_backoff_retry(row: EvaluationRow) -> EvaluationRow:
             """Execute rollout for a single row with backoff retry."""
             retry_config = replace(config, kwargs={**(config.kwargs or {}), "start_server": False})
             retry_tasks = rollout_processor([row], retry_config)
             return await retry_tasks[0]
 
-        async def execute_row_with_backoff(task: asyncio.Task, row: EvaluationRow) -> EvaluationRow:  # pyright: ignore[reportMissingTypeArgument, reportUnknownParameterType]
+        async def execute_row_with_backoff(task: asyncio.Task[EvaluationRow], row: EvaluationRow) -> EvaluationRow:
             """Execute a single row task with backoff retry."""
 
             try:
@@ -344,7 +348,9 @@ async def execute_row_with_backoff(task: asyncio.Task, row: EvaluationRow) -> Ev
                     row.rollout_status = Status.rollout_error(repr(e))
                     return row
 
-        async def execute_row_with_backoff_and_log(task: asyncio.Task, row: EvaluationRow) -> EvaluationRow:  # pyright: ignore[reportMissingTypeArgument, reportUnknownParameterType]
+        async def execute_row_with_backoff_and_log(
+            task: asyncio.Task[EvaluationRow], row: EvaluationRow
+        ) -> EvaluationRow:
             """Execute a single row task with backoff retry and logging."""
             result = await execute_row_with_backoff(task, row)
             # Log the row after execution completes (success or failure)
@@ -386,7 +392,7 @@ def sanitize_filename(text: str) -> str:
     return safe[:120]
 
 
-def extract_effort_tag(params: dict) -> str | None:  # pyright: ignore[reportMissingTypeArgument, reportUnknownParameterType]
+def extract_effort_tag(params: dict[str, Any]) -> str | None:
     """
     Extract effort tag from completion parameters for use in file naming.
 
diff --git a/tests/chinook/langfuse/remote_server.py b/tests/chinook/langfuse/remote_server.py
index 71971378..0cdc0afd 100644
--- a/tests/chinook/langfuse/remote_server.py
+++ b/tests/chinook/langfuse/remote_server.py
@@ -57,6 +57,13 @@ def _worker():
 
             # Prepare metadata payload to attach for Langfuse filtering
             metadata = {
+                "tags": [
+                    f"invocation_id:{req.metadata.get('invocation_id')}",
+                    f"experiment_id:{req.metadata.get('experiment_id')}",
+                    f"rollout_id:{req.metadata.get('rollout_id')}",
+                    f"run_id:{req.metadata.get('run_id')}",
+                    f"row_id:{req.metadata.get('row_id')}",
+                ],
                 "invocation_id": req.metadata.get("invocation_id"),
                 "experiment_id": req.metadata.get("experiment_id"),
                 "rollout_id": req.metadata.get("rollout_id"),
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook.py b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
index c121a6e4..59bf01d3 100644
--- a/tests/chinook/langfuse/test_remote_langfuse_chinook.py
+++ b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
@@ -12,6 +12,21 @@
 from eval_protocol.models import EvaluationRow, Message
 from eval_protocol.pytest import evaluation_test
 from eval_protocol.pytest.remote_rollout_processor import RemoteRolloutProcessor
+from eval_protocol.adapters.langfuse import create_langfuse_adapter
+
+INVOCATION_ID = ""
+
+
+def fetch_trajectories(invocation_id: str) -> List[EvaluationRow]:
+    global INVOCATION_ID  # This is just to verify the invocation_id is set correctly in the test
+    INVOCATION_ID = invocation_id
+
+    adapter = create_langfuse_adapter()
+    return adapter.get_evaluation_rows(tags=[f"invocation_id:{invocation_id}"])
+
+
+def create_output_data_loader(invocation_id: str) -> DynamicDataLoader:
+    return DynamicDataLoader(generators=[lambda: fetch_trajectories(invocation_id)])
 
 
 def _start_remote_server():
@@ -63,101 +78,29 @@ def remote_langfuse_data_generator() -> List[EvaluationRow]:
 
 
 @pytest.mark.skipif(os.environ.get("CI") == "true", reason="Only run this test locally (skipped in CI)")
-@pytest.mark.asyncio
+@pytest.mark.parametrize("completion_params", [{"model": "fireworks_ai/accounts/fireworks/models/kimi-k2-instruct"}])
 @evaluation_test(
     data_loaders=DynamicDataLoader(
         generators=[remote_langfuse_data_generator],
     ),
-    completion_params=[{"model": "fireworks_ai/accounts/fireworks/models/kimi-k2-instruct"}],
     rollout_processor=RemoteRolloutProcessor(
         remote_base_url="http://127.0.0.1:7077",
         num_turns=2,
         timeout_seconds=30,
+        output_data_loader=create_output_data_loader,
     ),
-    mode="pointwise",
 )
 async def test_remote_rollout_and_fetch_langfuse(row: EvaluationRow) -> EvaluationRow:
     """
     End-to-end test:
     - remote server started at import time
     - trigger remote rollout via RemoteRolloutProcessor (calls init/status)
-    - fetch traces from Langfuse filtered by metadata; FAIL if none found
+    - fetch traces from Langfuse filtered by metadata via output_data_loader; FAIL if none found
     """
-    # Debug print IDs used for filtering
-    print(
-        "[Remote-E2E] IDs:",
-        {
-            "invocation_id": row.execution_metadata.invocation_id,
-            "experiment_id": row.execution_metadata.experiment_id,
-            "rollout_id": row.execution_metadata.rollout_id,
-            "run_id": row.execution_metadata.run_id,
-        },
-    )
-
-    # Attempt retrieval via adapter
-    try:
-        from eval_protocol.adapters.langfuse import create_langfuse_adapter
-
-        adapter = create_langfuse_adapter()
-
-        # Preferred: observations-level requester_metadata contains invocation_id (proxy annotates per-request)
-        contains_val = row.execution_metadata.invocation_id or ""
-        rows = []
-        if contains_val:
-            # Retry loop to allow ingestion/flush
-            deadline = time.time() + 90
-            while time.time() < deadline and not rows:
-                rows = adapter.get_evaluation_rows(
-                    limit=10,
-                    from_timestamp=datetime.now() - timedelta(hours=2),
-                    to_timestamp=datetime.now(),
-                    include_tool_calls=False,
-                    requester_metadata_contains=contains_val,
-                )
-                if rows:
-                    break
-                time.sleep(3)
-        else:
-            print("[Remote-E2E] Missing invocation_id; skipping observations filter")
-
-        # If still empty, dump recent trace metadata for debugging
-        if not rows:
-            try:
-                from langfuse import get_client  # pyright: ignore[reportPrivateImportUsage]
-
-                lf = get_client()
-                recent = lf.api.trace.list(limit=5, order_by="timestamp.desc")
-                print("[Remote-E2E] Recent trace metadata dump (id, metadata, requester_metadata, tags):")
-                if recent and getattr(recent, "data", None):
-                    for t in recent.data:
-                        try:
-                            full = lf.api.trace.get(t.id)
-                            print(
-                                {
-                                    "id": full.id,
-                                    "metadata": getattr(full, "metadata", None),
-                                    "requester_metadata": getattr(full, "requester_metadata", None),
-                                    "tags": getattr(full, "tags", None),
-                                }
-                            )
-                        except Exception as e:
-                            print("[Remote-E2E] Failed to get trace details:", e)
-                else:
-                    print("[Remote-E2E] No recent traces found via list().")
-            except Exception as e:
-                print("[Remote-E2E] Langfuse debug fetch failed:", e)
-
-        assert rows and len(rows) > 0, (
-            "No Langfuse traces matched the metadata. Ensure the LiteLLM proxy is configured to forward "
-            "Langfuse telemetry and that LANGFUSE_* env vars are set."
-        )
-
-        # Minimal sanity: rows contain session_data.langfuse_trace_id
-        assert any((r.input_metadata.session_data or {}).get("langfuse_trace_id") for r in rows), (
-            "Expected langfuse_trace_id in session_data for at least one row"
-        )
-
-    except ImportError:
-        pytest.fail("Langfuse SDK not installed; cannot verify traces.")
+    # Sanity check: row should have an invocation_id since it came from Langfuse via output_data_loader
+    assert row.messages[0].content == "Hello there! Please say hi back.", "Row should have correct message content"
+    assert row.execution_metadata.invocation_id == INVOCATION_ID, "Row should have correct invocation_id set"
+
+    print(f"✅ Successfully received row from Langfuse with invocation_id: {row.execution_metadata.invocation_id}")
 
     return row

From 7fdb8725a7e5839032d958060c87243de98213fe Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Wed, 24 Sep 2025 18:31:54 -0700
Subject: [PATCH 02/12] break early

---
 eval_protocol/adapters/langfuse.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/eval_protocol/adapters/langfuse.py b/eval_protocol/adapters/langfuse.py
index 675ce1ea..195e9adc 100644
--- a/eval_protocol/adapters/langfuse.py
+++ b/eval_protocol/adapters/langfuse.py
@@ -110,6 +110,15 @@ def convert_trace_to_evaluation_row(
                 elif tag.startswith("row_id:") and not row_id:
                     row_id = tag.split(":", 1)[1]
 
+                if (
+                    execution_metadata.invocation_id
+                    and execution_metadata.experiment_id
+                    and execution_metadata.rollout_id
+                    and execution_metadata.run_id
+                    and row_id
+                ):
+                    break  # Break early if we've found all the metadata we need
+
         return EvaluationRow(
             messages=messages,
             tools=tools,

From 2d4d22bdd0c0bfee2342143002f56946ab8b3977 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Wed, 24 Sep 2025 18:48:58 -0700
Subject: [PATCH 03/12] fix tests

---
 eval_protocol/adapters/langfuse.py      |  2 +-
 tests/adapters/test_langfuse_adapter.py | 23 +++++++++++++++++------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/eval_protocol/adapters/langfuse.py b/eval_protocol/adapters/langfuse.py
index 195e9adc..2f0d487a 100644
--- a/eval_protocol/adapters/langfuse.py
+++ b/eval_protocol/adapters/langfuse.py
@@ -373,7 +373,7 @@ def get_evaluation_rows(
                     )
 
                     # If no results, possible due to indexing delay--remote rollout processor just finished pushing rows to Langfuse
-                    if traces and hasattr(traces, "meta") and traces.meta.total_items == 0 and page == 1:
+                    if traces and traces.meta and traces.meta.total_items == 0 and page == 1:
                         raise Exception("Empty results - indexing delay")
 
                     break
diff --git a/tests/adapters/test_langfuse_adapter.py b/tests/adapters/test_langfuse_adapter.py
index 3a4c2699..06f2d5ba 100644
--- a/tests/adapters/test_langfuse_adapter.py
+++ b/tests/adapters/test_langfuse_adapter.py
@@ -63,7 +63,9 @@ def _create_mock_trace(
     trace_id: str, input_data: Any = None, output_data: Any = None, observations: Optional[List] = None
 ):
     """Helper to create mock trace objects"""
-    return SimpleNamespace(id=trace_id, input=input_data, output=output_data, observations=observations or [])
+    return SimpleNamespace(
+        id=trace_id, input=input_data, output=output_data, observations=observations or [], tags=[], metadata={}
+    )
 
 
 def _create_mock_traces_response(traces: List[Dict[str, Any]]):
@@ -72,7 +74,15 @@ def _create_mock_traces_response(traces: List[Dict[str, Any]]):
     for trace_data in traces:
         trace_objects.append(SimpleNamespace(**trace_data))
 
-    return SimpleNamespace(data=trace_objects, meta=SimpleNamespace(page=1, total_pages=1))
+    return SimpleNamespace(
+        data=trace_objects,
+        meta=SimpleNamespace(
+            page=1,
+            total_pages=1,
+            total_items=len(trace_objects),  # Add total_items to match real API
+            limit=100,
+        ),
+    )
 
 
 @pytest.fixture
@@ -161,7 +171,7 @@ def test_trace_conversion_with_span_name():
     """Test trace conversion with specific span name"""
     # Mock observations with spans and generations
     observations = [
-        SimpleNamespace(id="span1", name="judge", type="SPAN"),
+        SimpleNamespace(id="span1", name="judge", type="SPAN", metadata={}),
         SimpleNamespace(
             id="gen1",
             name="generation",
@@ -170,6 +180,7 @@ def test_trace_conversion_with_span_name():
             input={"messages": [{"role": "user", "content": "Judge this"}]},
             output={"messages": [{"role": "assistant", "content": "Good response"}]},
             start_time=datetime.now(),
+            metadata={},
         ),
     ]
 
@@ -304,7 +315,7 @@ def test_extract_messages_from_various_formats():
         input_data={"messages": [{"role": "user", "content": "Hello"}]},
         output_data={"messages": [{"role": "assistant", "content": "Hi"}]},
     )
-    messages1 = extract_messages_from_trace(trace1)
+    messages1 = extract_messages_from_trace(trace1)  # pyright: ignore[reportArgumentType]
     assert len(messages1) == 2
     assert messages1[0].role == "user"
     assert messages1[1].role == "assistant"
@@ -313,7 +324,7 @@ def test_extract_messages_from_various_formats():
     trace2 = _create_mock_trace(
         "trace2", input_data={"prompt": "What is AI?"}, output_data={"content": "AI is artificial intelligence"}
     )
-    messages2 = extract_messages_from_trace(trace2)
+    messages2 = extract_messages_from_trace(trace2)  # pyright: ignore[reportArgumentType]
     assert len(messages2) == 2
     assert messages2[0].role == "user"
     assert messages2[0].content == "What is AI?"
@@ -326,7 +337,7 @@ def test_extract_messages_from_various_formats():
         input_data=[{"role": "user", "content": "List format"}],
         output_data=[{"role": "assistant", "content": "Response"}],
     )
-    messages3 = extract_messages_from_trace(trace3)
+    messages3 = extract_messages_from_trace(trace3)  # pyright: ignore[reportArgumentType]
     assert len(messages3) == 2
     assert messages3[0].content == "List format"
     assert messages3[1].content == "Response"

From 2dccc9c904c422c5dec9811ec6bbd7fa6e315a32 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Wed, 24 Sep 2025 23:00:04 -0700
Subject: [PATCH 04/12] use mocks instead in the test

---
 tests/adapters/test_langfuse_adapter.py | 80 +++++++++++++------------
 1 file changed, 43 insertions(+), 37 deletions(-)

diff --git a/tests/adapters/test_langfuse_adapter.py b/tests/adapters/test_langfuse_adapter.py
index 06f2d5ba..bfd336b6 100644
--- a/tests/adapters/test_langfuse_adapter.py
+++ b/tests/adapters/test_langfuse_adapter.py
@@ -1,7 +1,6 @@
 """Tests for Langfuse adapter."""
 
 from datetime import datetime, timedelta
-from types import SimpleNamespace
 from typing import Any, Dict, List, Optional
 from unittest.mock import Mock
 
@@ -63,8 +62,19 @@ def _create_mock_trace(
     trace_id: str, input_data: Any = None, output_data: Any = None, observations: Optional[List] = None
 ):
     """Helper to create mock trace objects"""
-    return SimpleNamespace(
-        id=trace_id, input=input_data, output=output_data, observations=observations or [], tags=[], metadata={}
+    # Ensure observations have metadata attribute
+    obs_with_metadata = []
+    for obs in observations or []:
+        if hasattr(obs, "metadata"):
+            obs_with_metadata.append(obs)
+        else:
+            # Add metadata to existing observation
+            obs_dict = obs.__dict__ if hasattr(obs, "__dict__") else {}
+            obs_dict["metadata"] = getattr(obs, "metadata", {})
+            obs_with_metadata.append(Mock(**obs_dict))
+
+    return Mock(
+        id=trace_id, input=input_data, output=output_data, observations=obs_with_metadata, tags=[], metadata={}
     )
 
 
@@ -72,17 +82,9 @@ def _create_mock_traces_response(traces: List[Dict[str, Any]]):
     """Helper to create mock traces list response"""
     trace_objects = []
     for trace_data in traces:
-        trace_objects.append(SimpleNamespace(**trace_data))
-
-    return SimpleNamespace(
-        data=trace_objects,
-        meta=SimpleNamespace(
-            page=1,
-            total_pages=1,
-            total_items=len(trace_objects),  # Add total_items to match real API
-            limit=100,
-        ),
-    )
+        trace_objects.append(Mock(**trace_data))
+
+    return Mock(data=trace_objects, meta=Mock(page=1, total_pages=1, total_items=len(trace_objects), limit=100))
 
 
 @pytest.fixture
@@ -111,8 +113,7 @@ def test_basic_trace_conversion():
         input_data={"messages": [{"role": "user", "content": "What's the weather?"}]},
         output_data={"messages": [{"role": "assistant", "content": "It's sunny!"}]},
     )
-
-    result = convert_trace_to_evaluation_row(trace)  # pyright: ignore[reportArgumentType]
+    result = convert_trace_to_evaluation_row(trace)
 
     assert result is not None
     assert len(result.messages) == 2
@@ -150,7 +151,7 @@ def test_trace_with_tool_calls():
         },
     )
 
-    result = convert_trace_to_evaluation_row(trace, include_tool_calls=True)  # pyright: ignore[reportArgumentType]
+    result = convert_trace_to_evaluation_row(trace, include_tool_calls=True)
 
     assert result is not None
     assert result.tools is not None
@@ -170,22 +171,27 @@ def test_trace_with_tool_calls():
 def test_trace_conversion_with_span_name():
     """Test trace conversion with specific span name"""
     # Mock observations with spans and generations
-    observations = [
-        SimpleNamespace(id="span1", name="judge", type="SPAN", metadata={}),
-        SimpleNamespace(
-            id="gen1",
-            name="generation",
-            type="GENERATION",
-            parent_observation_id="span1",
-            input={"messages": [{"role": "user", "content": "Judge this"}]},
-            output={"messages": [{"role": "assistant", "content": "Good response"}]},
-            start_time=datetime.now(),
-            metadata={},
-        ),
-    ]
+    span_mock = Mock()
+    span_mock.id = "span1"
+    span_mock.name = "judge"
+    span_mock.type = "SPAN"
+    span_mock.metadata = {}
+    span_mock.parent_observation_id = None
+
+    gen_mock = Mock()
+    gen_mock.id = "gen1"
+    gen_mock.name = "generation"
+    gen_mock.type = "GENERATION"
+    gen_mock.parent_observation_id = "span1"
+    gen_mock.input = {"messages": [{"role": "user", "content": "Judge this"}]}
+    gen_mock.output = {"messages": [{"role": "assistant", "content": "Good response"}]}
+    gen_mock.start_time = datetime.now()
+    gen_mock.metadata = {}
+
+    observations = [span_mock, gen_mock]
 
     trace = _create_mock_trace("trace_span", observations=observations)
-    result = convert_trace_to_evaluation_row(trace, span_name="judge")  # pyright: ignore[reportArgumentType]
+    result = convert_trace_to_evaluation_row(trace, span_name="judge")
 
     assert result is not None
     assert len(result.messages) == 2
@@ -197,7 +203,7 @@ def test_empty_trace_returns_none():
     """Test that empty traces return None"""
     trace = _create_mock_trace("empty_trace", input_data=None, output_data=None)
 
-    result = convert_trace_to_evaluation_row(trace)  # pyright: ignore[reportArgumentType]
+    result = convert_trace_to_evaluation_row(trace)
 
     assert result is None
 
@@ -205,9 +211,9 @@ def test_empty_trace_returns_none():
 def test_malformed_trace_returns_none():
     """Test that malformed traces are handled gracefully"""
     # Trace with missing required attributes
-    trace = SimpleNamespace(id="malformed")  # Missing input/output
+    trace = Mock(id="malformed")  # Missing input/output
 
-    result = convert_trace_to_evaluation_row(trace)  # pyright: ignore[reportArgumentType]
+    result = convert_trace_to_evaluation_row(trace)
 
     assert result is None
 
@@ -315,7 +321,7 @@ def test_extract_messages_from_various_formats():
         input_data={"messages": [{"role": "user", "content": "Hello"}]},
         output_data={"messages": [{"role": "assistant", "content": "Hi"}]},
     )
-    messages1 = extract_messages_from_trace(trace1)  # pyright: ignore[reportArgumentType]
+    messages1 = extract_messages_from_trace(trace1)
     assert len(messages1) == 2
     assert messages1[0].role == "user"
     assert messages1[1].role == "assistant"
@@ -324,7 +330,7 @@ def test_extract_messages_from_various_formats():
     trace2 = _create_mock_trace(
         "trace2", input_data={"prompt": "What is AI?"}, output_data={"content": "AI is artificial intelligence"}
     )
-    messages2 = extract_messages_from_trace(trace2)  # pyright: ignore[reportArgumentType]
+    messages2 = extract_messages_from_trace(trace2)
     assert len(messages2) == 2
     assert messages2[0].role == "user"
     assert messages2[0].content == "What is AI?"
@@ -337,7 +343,7 @@ def test_extract_messages_from_various_formats():
         input_data=[{"role": "user", "content": "List format"}],
         output_data=[{"role": "assistant", "content": "Response"}],
     )
-    messages3 = extract_messages_from_trace(trace3)  # pyright: ignore[reportArgumentType]
+    messages3 = extract_messages_from_trace(trace3)
     assert len(messages3) == 2
     assert messages3[0].content == "List format"
     assert messages3[1].content == "Response"

From 0a9a9a46d5bda2b66302e0adb2fbe19f310e0194 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Thu, 25 Sep 2025 11:35:09 -0700
Subject: [PATCH 05/12] remove the requester_metadata stuff

---
 eval_protocol/adapters/langfuse.py            | 130 +-----------------
 .../langfuse/test_remote_langfuse_chinook.py  |  16 +++
 2 files changed, 21 insertions(+), 125 deletions(-)

diff --git a/eval_protocol/adapters/langfuse.py b/eval_protocol/adapters/langfuse.py
index 2f0d487a..42eeee6f 100644
--- a/eval_protocol/adapters/langfuse.py
+++ b/eval_protocol/adapters/langfuse.py
@@ -85,29 +85,17 @@ def convert_trace_to_evaluation_row(
         execution_metadata = ExecutionMetadata()
         row_id = None
 
-        if trace.observations:
-            for obs in trace.observations:
-                if obs.metadata and "requester_metadata" in obs.metadata:
-                    req_meta = obs.metadata["requester_metadata"]
-                    if isinstance(req_meta, dict):
-                        execution_metadata.invocation_id = req_meta.get("invocation_id")
-                        execution_metadata.experiment_id = req_meta.get("experiment_id")
-                        execution_metadata.rollout_id = req_meta.get("rollout_id")
-                        execution_metadata.run_id = req_meta.get("run_id")
-                        row_id = req_meta.get("row_id")
-                    break  # Only need to get first observation
-
         if trace.tags:
             for tag in trace.tags:
-                if tag.startswith("invocation_id:") and not execution_metadata.invocation_id:
+                if tag.startswith("invocation_id:"):
                     execution_metadata.invocation_id = tag.split(":", 1)[1]
-                elif tag.startswith("experiment_id:") and not execution_metadata.experiment_id:
+                elif tag.startswith("experiment_id:"):
                     execution_metadata.experiment_id = tag.split(":", 1)[1]
-                elif tag.startswith("rollout_id:") and not execution_metadata.rollout_id:
+                elif tag.startswith("rollout_id:"):
                     execution_metadata.rollout_id = tag.split(":", 1)[1]
-                elif tag.startswith("run_id:") and not execution_metadata.run_id:
+                elif tag.startswith("run_id:"):
                     execution_metadata.run_id = tag.split(":", 1)[1]
-                elif tag.startswith("row_id:") and not row_id:
+                elif tag.startswith("row_id:"):
                     row_id = tag.split(":", 1)[1]
 
                 if (
@@ -298,9 +286,6 @@ def get_evaluation_rows(
         max_retries: int = 3,
         span_name: Optional[str] = None,
         converter: Optional[TraceConverter] = None,
-        metadata: Optional[Dict[str, Any]] = None,
-        requester_metadata: Optional[Dict[str, Any]] = None,
-        requester_metadata_contains: Optional[str] = None,
     ) -> List[EvaluationRow]:
         """Pull traces from Langfuse and convert to EvaluationRow format.
 
@@ -335,10 +320,6 @@ def get_evaluation_rows(
             to_timestamp = datetime.now()
             from_timestamp = to_timestamp - timedelta(hours=hours_back)
 
-        # If filtering by metadata/requester_metadata, prefer fetching metadata fields
-        if (metadata is not None or requester_metadata is not None or requester_metadata_contains) and not fields:
-            fields = "core,metadata,observations"
-
         # Collect trace summaries via pagination (up to limit)
         all_traces = []
         page = 1
@@ -420,74 +401,6 @@ def get_evaluation_rows(
             selected_traces = all_traces
             logger.debug("Processing all %d collected traces (no sampling)", len(all_traces))
 
-        # Helper to check if a trace matches provided metadata filters. We look in multiple places
-        # to account for Langfuse moving fields (e.g., metadata vs requester_metadata) and SDK shape.
-        def _trace_matches_metadata_filters(trace_obj: Any) -> bool:
-            if metadata is None and requester_metadata is None:
-                return True
-
-            def _as_dict(val: Any) -> Dict[str, Any]:
-                if val is None:
-                    return {}
-                if isinstance(val, dict):
-                    return val
-                # Some SDK objects expose .model_dump() or behave like pydantic models
-                dump = getattr(val, "model_dump", None)
-                if callable(dump):
-                    try:
-                        return dump()  # type: ignore[no-any-return]
-                    except Exception:
-                        return {}
-                return {}
-
-            # Try common locations for metadata on full trace
-            trace_meta = _as_dict(getattr(trace_obj, "metadata", None))
-            trace_req_meta = _as_dict(getattr(trace_obj, "requester_metadata", None))
-            # Some Langfuse deployments nest requester_metadata inside metadata
-            nested_req_meta = {}
-            try:
-                if isinstance(trace_meta, dict) and isinstance(trace_meta.get("requester_metadata"), dict):
-                    nested_req_meta = _as_dict(trace_meta.get("requester_metadata"))
-            except Exception:
-                nested_req_meta = {}
-
-            # Fallbacks: sometimes metadata is embedded in input
-            input_meta = {}
-            try:
-                inp = getattr(trace_obj, "input", None)
-                if isinstance(inp, dict):
-                    input_meta = _as_dict(inp.get("metadata"))
-            except Exception:
-                input_meta = {}
-
-            # Combine for matching convenience (later keys override earlier for equality check only)
-            combined_meta = {**trace_meta, **input_meta}
-            combined_req_meta = {**trace_req_meta}
-
-            # Also merge nested requester metadata when present
-            if nested_req_meta:
-                combined_req_meta = {**combined_req_meta, **nested_req_meta}
-
-            def _is_subset(needle: Dict[str, Any], haystack: Dict[str, Any]) -> bool:
-                for k, v in needle.items():
-                    if haystack.get(k) != v:
-                        return False
-                return True
-
-            ok_meta = True
-            ok_req_meta = True
-
-            if metadata is not None:
-                # Accept match if found either in metadata or requester_metadata buckets
-                ok_meta = _is_subset(metadata, combined_meta) or _is_subset(metadata, combined_req_meta)
-
-            if requester_metadata is not None:
-                ok_req_meta = _is_subset(requester_metadata, combined_req_meta) or _is_subset(
-                    requester_metadata, combined_meta
-                )
-
-            return ok_meta and ok_req_meta
-
         # Process each selected trace with sleep and retry logic
         for trace_info in selected_traces:
             # Sleep between gets to avoid rate limits
@@ -524,39 +437,6 @@ def _is_subset(needle: Dict[str, Any], haystack: Dict[str, Any]) -> bool:
                         break  # Skip this trace
 
             if trace_full:
-                # If metadata filters are provided, skip non-matching traces early
-                try:
-                    if not _trace_matches_metadata_filters(trace_full):
-                        continue
-                except Exception:
-                    # Be permissive on filter errors; treat as non-match
-                    continue
-
-                # If observations carry requester_metadata, allow substring filtering
-                if requester_metadata_contains:
-                    contains_val = requester_metadata_contains
-                    found_match = False
-                    try:
-                        for obs in getattr(trace_full, "observations", []) or []:
-                            obs_rmd = getattr(obs, "requester_metadata", None)
-                            if isinstance(obs_rmd, dict) and any(
-                                (isinstance(v, str) and contains_val in v) for v in obs_rmd.values()
-                            ):
-                                found_match = True
-                                break
-                            obs_md = getattr(obs, "metadata", None)
-                            if isinstance(obs_md, dict):
-                                nested = obs_md.get("requester_metadata")
-                                if isinstance(nested, dict) and any(
-                                    (isinstance(v, str) and contains_val in v) for v in nested.values()
-                                ):
-                                    found_match = True
-                                    break
-                    except Exception:
-                        found_match = False
-                    if not found_match:
-                        continue
-
                 try:
                     if converter:
                         eval_row = converter(trace_full, include_tool_calls, span_name)
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook.py b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
index 59bf01d3..0c8ffbb1 100644
--- a/tests/chinook/langfuse/test_remote_langfuse_chinook.py
+++ b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
@@ -15,6 +15,19 @@
 from eval_protocol.adapters.langfuse import create_langfuse_adapter
 
 INVOCATION_ID = ""
+ASSERTION_EXECUTED = False
+
+
+@pytest.fixture(autouse=True)
+def check_assertion_executed():
+    """Ensure the test actually executed the Langfuse validation"""
+    global ASSERTION_EXECUTED
+    ASSERTION_EXECUTED = False  # Reset before test
+    yield
+    # After test completes, verify the assertion was executed
+    assert ASSERTION_EXECUTED, (
+        "Test passed but never validated Langfuse data - check if output_data_loader returned empty results"
+    )
 
 
 def fetch_trajectories(invocation_id: str) -> List[EvaluationRow]:
@@ -97,10 +110,13 @@ async def test_remote_rollout_and_fetch_langfuse(row: EvaluationRow) -> Evaluati
     - trigger remote rollout via RemoteRolloutProcessor (calls init/status)
     - fetch traces from Langfuse filtered by metadata via output_data_loader; FAIL if none found
     """
+    global ASSERTION_EXECUTED
+
     # Sanity check: row should have an invocation_id since it came from Langfuse via output_data_loader
     assert row.messages[0].content == "Hello there! Please say hi back.", "Row should have correct message content"
     assert row.execution_metadata.invocation_id == INVOCATION_ID, "Row should have correct invocation_id set"
 
+    ASSERTION_EXECUTED = True
     print(f"✅ Successfully received row from Langfuse with invocation_id: {row.execution_metadata.invocation_id}")
 
     return row

From 903584b9ce38ec809852abb01a564ae9026e2540 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Thu, 25 Sep 2025 13:33:47 -0700
Subject: [PATCH 06/12] pipelined

---
 eval_protocol/pytest/evaluation_test.py       | 46 +++++-------------
 .../pytest/remote_rollout_processor.py        | 35 +++++++-------
 eval_protocol/pytest/rollout_processor.py     |  8 ----
 eval_protocol/quickstart/utils.py             | 22 +++++++++
 .../langfuse/test_remote_langfuse_chinook.py  | 48 +++++++++----------
 5 files changed, 75 insertions(+), 84 deletions(-)

diff --git a/eval_protocol/pytest/evaluation_test.py b/eval_protocol/pytest/evaluation_test.py
index d0de8ea0..e34f7e4b 100644
--- a/eval_protocol/pytest/evaluation_test.py
+++ b/eval_protocol/pytest/evaluation_test.py
@@ -402,33 +402,15 @@ async def _execute_groupwise_eval_with_semaphore(
                                 return results
 
                         if mode == "pointwise":
+                            # Pointwise mode, rollouts will return as they complete so we can pipeline evaluation_test execution
                             pointwise_tasks: list[asyncio.Task[EvaluationRow]] = []
-
-                            if rollout_processor.supports_pipelining:
-                                # Pointwise mode, rollouts will return as they complete so we can pipeline evaluation_test execution
-                                # Use wrapper that handles retry logic internally
-                                async for row in rollout_processor_with_retry(
-                                    rollout_processor, fresh_dataset, config, run_idx
-                                ):
-                                    pointwise_tasks.append(
-                                        asyncio.create_task(_execute_pointwise_eval_with_semaphore(row=row))
-                                    )
-                            else:
-                                # Non-pipelined mode: collect all rollout results first, then postprocess, then evaluate
-                                collected_rollout_rows: list[EvaluationRow] = []
-                                async for row in rollout_processor_with_retry(
-                                    rollout_processor, fresh_dataset, config, run_idx
-                                ):
-                                    collected_rollout_rows.append(row)
-
-                                # Post-process rollout results to get evaluation inputs
-                                eval_input_rows = rollout_processor.postprocess(collected_rollout_rows)
-
-                                # Now evaluate all the post-processed rows
-                                for row in eval_input_rows:
-                                    pointwise_tasks.append(
-                                        asyncio.create_task(_execute_pointwise_eval_with_semaphore(row=row))
-                                    )
+                            # Use wrapper that handles retry logic internally
+                            async for row in rollout_processor_with_retry(
+                                rollout_processor, fresh_dataset, config, run_idx
+                            ):
+                                pointwise_tasks.append(
+                                    asyncio.create_task(_execute_pointwise_eval_with_semaphore(row=row))
+                                )
 
                             # Run evaluation tasks with progress bar
                             results = await run_tasks_with_eval_progress(pointwise_tasks, run_idx)
@@ -471,13 +453,9 @@ async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParamete
                                     lst.append(copied_row)  # pyright: ignore[reportUnknownMemberType]
                                 tasks.append(asyncio.create_task(_collect_result(config, lst)))  # pyright: ignore[reportUnknownArgumentType]
                             rollout_results = await asyncio.gather(*tasks)
-
-                            # Flatten and postprocess all rollout results
-                            all_rollout_rows = [row for result in rollout_results for row in result]
-                            processed_rows = rollout_processor.postprocess(all_rollout_rows)
-
-                            for row in processed_rows:
-                                row_groups[row.input_metadata.row_id].append(row)
+                            for result in rollout_results:
+                                for row in result:
+                                    row_groups[row.input_metadata.row_id].append(row)  # pyright: ignore[reportUnknownMemberType]
                             tasks = []
                             for _, rows in row_groups.items():  # pyright: ignore[reportUnknownVariableType]
                                 tasks.append(asyncio.create_task(_execute_groupwise_eval_with_semaphore(rows=rows)))  # pyright: ignore[reportUnknownArgumentType]
@@ -494,8 +472,6 @@ async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParamete
                             ):
                                 input_dataset.append(row)  # pyright: ignore[reportUnknownMemberType]
 
-                            input_dataset = rollout_processor.postprocess(input_dataset)
-
                             # NOTE: we will still evaluate errored rows (give users control over this)
                             # i.e., they can choose to give EvaluateResult.score = 0 for errored rows in their test_func
                             results = await execute_pytest(
diff --git a/eval_protocol/pytest/remote_rollout_processor.py b/eval_protocol/pytest/remote_rollout_processor.py
index 4f0e102c..1e6b102e 100644
--- a/eval_protocol/pytest/remote_rollout_processor.py
+++ b/eval_protocol/pytest/remote_rollout_processor.py
@@ -36,8 +36,6 @@ class RemoteRolloutProcessor(RolloutProcessor):
       Returns: {"terminated": bool, "info": {...}?}
     """
 
-    supports_pipelining: bool = False  # Remote rollout processor cannot pipeline - must wait for all rollouts to complete before fetching results.
-
     def __init__(
         self,
         *,
@@ -156,27 +154,30 @@ def _get_status() -> Dict[str, Any]:
 
             # Update duration, regardless of termination
             row.execution_metadata.duration_seconds = time.perf_counter() - start_time
-            return row
 
-        for r in rows:
-            tasks.append(asyncio.create_task(_process_row(r)))
+            if row.execution_metadata.rollout_id is None:
+                raise ValueError("Rollout ID is required in RemoteRolloutProcessor")
 
-        return tasks
+            data_loader = self._output_data_loader(row.execution_metadata.rollout_id)
+
+            def _load_data():
+                return data_loader.load()
+
+            results = await asyncio.to_thread(_load_data)
 
-    def postprocess(self, finished_rollout_rows: List[EvaluationRow]) -> List[EvaluationRow]:
-        """Fetch actual evaluation rows from Langfuse using the output_data_loader."""
-        invocation_id = finished_rollout_rows[0].execution_metadata.invocation_id
-        if not invocation_id:
-            raise ValueError("Invocation ID is required in RemoteRolloutProcessor")
+            output_rows: List[EvaluationRow] = [row for result in results for row in result.rows]
 
-        data_loader = self._output_data_loader(invocation_id)
+            assert len(output_rows) == 1, "Dataloader used for RemoteRolloutProcessor should have exactly one row"
 
-        results = data_loader.load()
-        output_rows: List[EvaluationRow] = []
-        for result in results:
-            output_rows.extend(result.rows)
+            langfuse_row = output_rows[0]
+            langfuse_row.input_metadata.completion_params = row.input_metadata.completion_params
 
-        return output_rows
+            return langfuse_row
+
+        for r in rows:
+            tasks.append(asyncio.create_task(_process_row(r)))
+
+        return tasks
 
     def cleanup(self) -> None:
         return None
diff --git a/eval_protocol/pytest/rollout_processor.py b/eval_protocol/pytest/rollout_processor.py
index 5389b1c6..313f1768 100644
--- a/eval_protocol/pytest/rollout_processor.py
+++ b/eval_protocol/pytest/rollout_processor.py
@@ -10,19 +10,11 @@ class RolloutProcessor(ABC):
     Abstract base class for all rollout processor strategies.
     """
 
-    supports_pipelining: bool = (
-        True  # Whether this processor supports pipelined evaluation (evaluate rows as rollouts complete)
-    )
-
     @abstractmethod
     def __call__(self, rows: list[EvaluationRow], config: RolloutProcessorConfig) -> list[asyncio.Task[EvaluationRow]]:
         """Process evaluation rows and return async tasks. Must be implemented by subclasses."""
         pass
 
-    def postprocess(self, finished_rollout_rows: list[EvaluationRow]) -> list[EvaluationRow]:
-        """Post-process rollout results to produce evaluation inputs. Only available for processors that return False from supports_pipelining."""
-        return finished_rollout_rows
-
     def cleanup(self) -> None:
         """Cleanup resources. Override in subclasses if cleanup is needed."""
         pass
diff --git a/eval_protocol/quickstart/utils.py b/eval_protocol/quickstart/utils.py
index 96ecb808..a5ab49d5 100644
--- a/eval_protocol/quickstart/utils.py
+++ b/eval_protocol/quickstart/utils.py
@@ -186,6 +186,28 @@ def assistant_to_ground_truth(data: list[EvaluationRow]) -> list[EvaluationRow]:
     return processed_rows
 
 
+def filter_longest_conversation(data: list[EvaluationRow]) -> list[EvaluationRow]:
+    """
+    Filter out the longest conversation from a list of evaluation rows that share the same rollout_id.
+
+    Args:
+        data: List of EvaluationRow objects that share the same rollout_id
+
+    Returns:
+        List containing only the EvaluationRow with the most messages (longest conversation)
+    """
+    if not data:
+        return data
+
+    if len(data) == 1:
+        return data
+
+    # Find the row with the most messages (longest conversation)
+    longest_row = max(data, key=lambda row: len(row.messages))
+
+    return [longest_row]
+
+
 async def run_single_judgment(
     question_text: str, answer_a: str, answer_b: str, tools, judge_config, client
 ) -> Optional[Dict[str, Any]]:
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook.py b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
index 0c8ffbb1..28c9b9bb 100644
--- a/tests/chinook/langfuse/test_remote_langfuse_chinook.py
+++ b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
@@ -13,33 +13,37 @@
 from eval_protocol.pytest import evaluation_test
 from eval_protocol.pytest.remote_rollout_processor import RemoteRolloutProcessor
 from eval_protocol.adapters.langfuse import create_langfuse_adapter
+from eval_protocol.quickstart.utils import filter_longest_conversation
 
-INVOCATION_ID = ""
-ASSERTION_EXECUTED = False
+ROLLOUT_IDS = set()
 
 
 @pytest.fixture(autouse=True)
-def check_assertion_executed():
-    """Ensure the test actually executed the Langfuse validation"""
-    global ASSERTION_EXECUTED
-    ASSERTION_EXECUTED = False  # Reset before test
+def check_rollout_coverage():
+    """Ensure we processed all expected rollout_ids"""
+    global ROLLOUT_IDS
+    ROLLOUT_IDS.clear()
     yield
-    # After test completes, verify the assertion was executed
-    assert ASSERTION_EXECUTED, (
-        "Test passed but never validated Langfuse data - check if output_data_loader returned empty results"
+
+    # Verify we've seen the expected number of rollout_ids after test is done
+    expected_rollout_count = 3
+    assert len(ROLLOUT_IDS) == expected_rollout_count, (
+        f"Expected to see {expected_rollout_count} rollout_ids, but only saw {len(ROLLOUT_IDS)}: {ROLLOUT_IDS}"
     )
 
 
-def fetch_trajectories(invocation_id: str) -> List[EvaluationRow]:
-    global INVOCATION_ID  # This is just to verify the invocation_id is set correctly in the test
-    INVOCATION_ID = invocation_id
+def fetch_langfuse_traces(rollout_id: str) -> List[EvaluationRow]:
+    global ROLLOUT_IDS  # Track all rollout_ids we've seen
+    ROLLOUT_IDS.add(rollout_id)
 
     adapter = create_langfuse_adapter()
-    return adapter.get_evaluation_rows(tags=[f"invocation_id:{invocation_id}"])
+    return adapter.get_evaluation_rows(tags=[f"rollout_id:{rollout_id}"])
 
 
-def create_output_data_loader(invocation_id: str) -> DynamicDataLoader:
-    return DynamicDataLoader(generators=[lambda: fetch_trajectories(invocation_id)])
+def langfuse_output_data_loader(rollout_id: str) -> DynamicDataLoader:
+    return DynamicDataLoader(
+        generators=[lambda: fetch_langfuse_traces(rollout_id)], preprocess_fn=filter_longest_conversation
+    )
 
 
 def _start_remote_server():
@@ -87,7 +91,7 @@ def remote_langfuse_data_generator() -> List[EvaluationRow]:
 
     # Minimal single-user-turn message to trigger a response
     row = EvaluationRow(messages=[Message(role="user", content="Hello there! Please say hi back.")])
-    return [row]
+    return [row, row, row]
 
 
 @pytest.mark.skipif(os.environ.get("CI") == "true", reason="Only run this test locally (skipped in CI)")
@@ -100,7 +104,7 @@ def remote_langfuse_data_generator() -> List[EvaluationRow]:
         remote_base_url="http://127.0.0.1:7077",
         num_turns=2,
         timeout_seconds=30,
-        output_data_loader=create_output_data_loader,
+        output_data_loader=langfuse_output_data_loader,
     ),
 )
 async def test_remote_rollout_and_fetch_langfuse(row: EvaluationRow) -> EvaluationRow:
@@ -110,13 +114,9 @@ async def test_remote_rollout_and_fetch_langfuse(row: EvaluationRow) -> Evaluati
     - trigger remote rollout via RemoteRolloutProcessor (calls init/status)
     - fetch traces from Langfuse filtered by metadata via output_data_loader; FAIL if none found
     """
-    global ASSERTION_EXECUTED
-
-    # Sanity check: row should have an invocation_id since it came from Langfuse via output_data_loader
     assert row.messages[0].content == "Hello there! Please say hi back.", "Row should have correct message content"
-    assert row.execution_metadata.invocation_id == INVOCATION_ID, "Row should have correct invocation_id set"
-
-    ASSERTION_EXECUTED = True
-    print(f"✅ Successfully received row from Langfuse with invocation_id: {row.execution_metadata.invocation_id}")
+    assert row.execution_metadata.rollout_id in ROLLOUT_IDS, (
+        f"Row rollout_id {row.execution_metadata.rollout_id} should be in tracked rollout_ids: {ROLLOUT_IDS}"
+    )
 
     return row

From 8cb080cea9ad702fa6ab0bd5bae0a680d83fd359 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Thu, 25 Sep 2025 13:38:01 -0700
Subject: [PATCH 07/12] removing pyright

---
 eval_protocol/pytest/evaluation_test.py | 39 ++++++++++++-------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/eval_protocol/pytest/evaluation_test.py b/eval_protocol/pytest/evaluation_test.py
index e34f7e4b..4aabd296 100644
--- a/eval_protocol/pytest/evaluation_test.py
+++ b/eval_protocol/pytest/evaluation_test.py
@@ -72,7 +72,7 @@ def evaluation_test(
     input_dataset: Sequence[DatasetPathParam] | None = None,
     input_rows: Sequence[list[EvaluationRow]] | None = None,
     data_loaders: Sequence[EvaluationDataLoader] | EvaluationDataLoader | None = None,
-    dataset_adapter: Callable[[list[dict[str, Any]]], Dataset] = default_dataset_adapter,  # pyright: ignore[reportExplicitAny]
+    dataset_adapter: Callable[[list[dict[str, Any]]], Dataset] = default_dataset_adapter,
     rollout_processor: RolloutProcessor | None = None,
     evaluation_test_kwargs: Sequence[EvaluationInputParam | None] | None = None,
     rollout_processor_kwargs: RolloutProcessorInputParam | None = None,
@@ -418,9 +418,7 @@ async def _execute_groupwise_eval_with_semaphore(
                             all_results[run_idx] = results
                         elif mode == "groupwise":
                             # rollout all the completion_params for the same row at once, and then send the output to the test_func
-                            row_groups = defaultdict(  # pyright: ignore[reportUnknownVariableType]
-                                list
-                            )  # key: row_id, value: list of rollout_result
+                            row_groups = defaultdict(list)  # key: row_id, value: list of rollout_result
                             tasks: list[asyncio.Task[list[EvaluationRow]]] = []
                             # completion_groups = []
                             for idx, cp in enumerate(original_completion_params):
@@ -435,13 +433,13 @@ async def _execute_groupwise_eval_with_semaphore(
                                 )
                                 lst = []
 
-                                async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParameterType, reportMissingParameterType]
+                                async def _collect_result(config, lst):
                                     result = []
                                     async for row in rollout_processor_with_retry(
                                         rollout_processor, lst, config, run_idx
                                     ):  # pyright: ignore[reportUnknownArgumentType]
-                                        result.append(row)  # pyright: ignore[reportUnknownMemberType]
-                                    return result  # pyright: ignore[reportUnknownVariableType]
+                                        result.append(row)
+                                    return result
 
                                 for ori_row in fresh_dataset:
                                     copied_row = ori_row.model_copy(deep=True)
@@ -450,19 +448,19 @@ async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParamete
                                         str(ori_row.execution_metadata.rollout_id) + "_" + str(idx)
                                     )
                                     copied_row.input_metadata.completion_params = cp if cp is not None else {}
-                                    lst.append(copied_row)  # pyright: ignore[reportUnknownMemberType]
-                                tasks.append(asyncio.create_task(_collect_result(config, lst)))  # pyright: ignore[reportUnknownArgumentType]
+                                    lst.append(copied_row)
+                                tasks.append(asyncio.create_task(_collect_result(config, lst)))
                             rollout_results = await asyncio.gather(*tasks)
                             for result in rollout_results:
                                 for row in result:
-                                    row_groups[row.input_metadata.row_id].append(row)  # pyright: ignore[reportUnknownMemberType]
+                                    row_groups[row.input_metadata.row_id].append(row)
                             tasks = []
-                            for _, rows in row_groups.items():  # pyright: ignore[reportUnknownVariableType]
-                                tasks.append(asyncio.create_task(_execute_groupwise_eval_with_semaphore(rows=rows)))  # pyright: ignore[reportUnknownArgumentType]
+                            for _, rows in row_groups.items():
+                                tasks.append(asyncio.create_task(_execute_groupwise_eval_with_semaphore(rows=rows)))
                             results = []
                             for task in tasks:
                                 res = await task
-                                results.extend(res)  # pyright: ignore[reportUnknownMemberType]
+                                results.extend(res)
                             all_results[run_idx] = results
                         else:
                             # Batch mode: collect all results first, then evaluate (no pipelining)
@@ -470,13 +468,12 @@ async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParamete
                             async for row in rollout_processor_with_retry(
                                 rollout_processor, fresh_dataset, config, run_idx
                             ):
-                                input_dataset.append(row)  # pyright: ignore[reportUnknownMemberType]
-
+                                input_dataset.append(row)
                             # NOTE: we will still evaluate errored rows (give users control over this)
                             # i.e., they can choose to give EvaluateResult.score = 0 for errored rows in their test_func
                             results = await execute_pytest(
                                 test_func,
-                                processed_dataset=input_dataset,  # pyright: ignore[reportUnknownArgumentType]
+                                processed_dataset=input_dataset,
                                 evaluation_test_kwargs=kwargs.get("evaluation_test_kwargs") or {},
                             )
                             if (
@@ -539,16 +536,16 @@ async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParamete
                     # for groupwise mode, the result contains eval otuput from multiple completion_params, we need to differentiate them
                     # rollout_id is used to differentiate the result from different completion_params
                     if mode == "groupwise":
-                        results_by_group = [  # pyright: ignore[reportUnknownVariableType]
+                        results_by_group = [
                             [[] for _ in range(num_runs)] for _ in range(len(original_completion_params))
                         ]
                         for i_run, result in enumerate(all_results):
                             for r in result:
                                 completion_param_idx = int(r.execution_metadata.rollout_id.split("_")[1])  # pyright: ignore[reportOptionalMemberAccess]
-                                results_by_group[completion_param_idx][i_run].append(r)  # pyright: ignore[reportUnknownMemberType]
-                        for rollout_id, result in enumerate(results_by_group):  # pyright: ignore[reportUnknownVariableType, reportUnknownArgumentType]
+                                results_by_group[completion_param_idx][i_run].append(r)
+                        for rollout_id, result in enumerate(results_by_group):
                             postprocess(
-                                result,  # pyright: ignore[reportUnknownArgumentType]
+                                result,
                                 aggregation_method,
                                 passed_threshold,
                                 active_logger,
@@ -600,7 +597,7 @@ async def _collect_result(config, lst):  # pyright: ignore[reportUnknownParamete
         pytest_wrapper = pytest.mark.asyncio(pytest_wrapper)
 
         # Create the dual mode wrapper
-        dual_mode_wrapper = create_dual_mode_wrapper(  # pyright: ignore[reportUnknownVariableType]
+        dual_mode_wrapper = create_dual_mode_wrapper(
             test_func, mode, max_concurrent_rollouts, max_concurrent_evaluations, pytest_wrapper
         )
 

From 5125e5a6a89e8810d746c401aa11f4ad7f74ad7d Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Thu, 25 Sep 2025 14:37:52 -0700
Subject: [PATCH 08/12] take out litellm

---
 .../pytest/remote_rollout_processor.py        | 17 +++---
 tests/chinook/langfuse/remote_server.py       | 52 +++++++++----------
 .../langfuse/test_remote_langfuse_chinook.py  | 10 ++--
 3 files changed, 39 insertions(+), 40 deletions(-)

diff --git a/eval_protocol/pytest/remote_rollout_processor.py b/eval_protocol/pytest/remote_rollout_processor.py
index 1e6b102e..9188a078 100644
--- a/eval_protocol/pytest/remote_rollout_processor.py
+++ b/eval_protocol/pytest/remote_rollout_processor.py
@@ -4,7 +4,7 @@
 
 import requests
 
-from eval_protocol.models import EvaluationRow
+from eval_protocol.models import EvaluationRow, Status
 from eval_protocol.data_loader.dynamic_data_loader import DynamicDataLoader
 from .rollout_processor import RolloutProcessor
 from .types import RolloutProcessorConfig
@@ -167,12 +167,15 @@ def _load_data():
 
             output_rows: List[EvaluationRow] = [row for result in results for row in result.rows]
 
-            assert len(output_rows) == 1, "Dataloader used for RemoteRolloutProcessor should have exactly one row"
-
-            langfuse_row = output_rows[0]
-            langfuse_row.input_metadata.completion_params = row.input_metadata.completion_params
-
-            return langfuse_row
+            if len(output_rows) == 0:  # Fallback to original row if no Langfuse data found
+                row.rollout_status = Status(code=Status.Code.NOT_FOUND, message="No Langfuse data found for rollout")
+                return row
+            elif len(output_rows) == 1:  # Return the Langfuse row
+                langfuse_row = output_rows[0]
+                langfuse_row.input_metadata.completion_params = row.input_metadata.completion_params
+                return langfuse_row
+            else:
+                raise ValueError("RemoteRolloutProcessor's output_data_loader should return exactly one row.")
 
         for r in rows:
             tasks.append(asyncio.create_task(_process_row(r)))
diff --git a/tests/chinook/langfuse/remote_server.py b/tests/chinook/langfuse/remote_server.py
index 0cdc0afd..0a83c9e0 100644
--- a/tests/chinook/langfuse/remote_server.py
+++ b/tests/chinook/langfuse/remote_server.py
@@ -5,7 +5,7 @@
 import uvicorn
 from fastapi import FastAPI, HTTPException
 from pydantic import BaseModel
-import requests
+from langfuse.openai import openai  # pyright: ignore[reportPrivateImportUsage]
 
 
 app = FastAPI()
@@ -42,52 +42,50 @@ def init(req: InitRequest):
     # Persist state
     _STATE[req.rollout_id] = {"terminated": False}
 
-    # Kick off worker thread that runs multi-turn chat via LiteLLM proxy
+    # Kick off worker thread that runs multi-turn chat via Langfuse OpenAI integration
     def _worker():
         try:
-            base_url = os.getenv(
-                "LITELLM_BASE_URL",
-                "https://litellm-cloud-proxy-prod-644257448872.us-central1.run.app",
-            )
-            url = f"{base_url}/v1/chat/completions"
-            headers = {
-                "Authorization": f"Bearer {os.getenv('FIREWORKS_API_KEY', '')}",
-                "Content-Type": "application/json",
-            }
-
-            # Prepare metadata payload to attach for Langfuse filtering
+            # Prepare tags for Langfuse filtering
             metadata = {
-                "tags": [
+                "langfuse_tags": [
                     f"invocation_id:{req.metadata.get('invocation_id')}",
                     f"experiment_id:{req.metadata.get('experiment_id')}",
                     f"rollout_id:{req.metadata.get('rollout_id')}",
                     f"run_id:{req.metadata.get('run_id')}",
                     f"row_id:{req.metadata.get('row_id')}",
-                ],
-                "invocation_id": req.metadata.get("invocation_id"),
-                "experiment_id": req.metadata.get("experiment_id"),
-                "rollout_id": req.metadata.get("rollout_id"),
-                "run_id": req.metadata.get("run_id"),
-                "row_id": req.metadata.get("row_id"),
+                ]
             }
 
             messages = req.messages
 
             # Simulate N-1 assistant turns (single-shot or simple echo)
             for _ in range(max(1, req.num_turns)):
-                payload = {
+                completion_kwargs = {
                     "model": req.model,
                     "messages": _clean_messages_for_api(messages),
                     "metadata": metadata,
                 }
+
                 if req.tools:
-                    payload["tools"] = req.tools
-                r = requests.post(url, json=payload, headers=headers, timeout=60)
-                r.raise_for_status()
-                data = r.json()
-                assistant = data.get("choices", [{}])[0].get("message", {})
+                    completion_kwargs["tools"] = req.tools
+
+                completion = openai.chat.completions.create(**completion_kwargs)
+                assistant_message = completion.choices[0].message
+
+                # Convert to dict format for next turn
+                assistant_dict = {"role": "assistant", "content": assistant_message.content}
+                if assistant_message.tool_calls:
+                    assistant_dict["tool_calls"] = [
+                        {
+                            "id": tc.id,
+                            "type": tc.type,
+                            "function": {"name": tc.function.name, "arguments": tc.function.arguments},
+                        }
+                        for tc in assistant_message.tool_calls
+                    ]
+
                 # Append assistant for next turn
-                messages = messages + [assistant]
+                messages = messages + [assistant_dict]
 
         except Exception:
             # Best-effort; mark as done even on error to unblock polling
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook.py b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
index 28c9b9bb..e5ea0eed 100644
--- a/tests/chinook/langfuse/test_remote_langfuse_chinook.py
+++ b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
@@ -25,11 +25,7 @@ def check_rollout_coverage():
     ROLLOUT_IDS.clear()
     yield
 
-    # Verify we've seen the expected number of rollout_ids after test is done
-    expected_rollout_count = 3
-    assert len(ROLLOUT_IDS) == expected_rollout_count, (
-        f"Expected to see {expected_rollout_count} rollout_ids, but only saw {len(ROLLOUT_IDS)}: {ROLLOUT_IDS}"
-    )
+    assert len(ROLLOUT_IDS) == 3, f"Expected to see {ROLLOUT_IDS} rollout_ids, but only saw {ROLLOUT_IDS}"
 
 
 def fetch_langfuse_traces(rollout_id: str) -> List[EvaluationRow]:
@@ -95,7 +91,7 @@ def remote_langfuse_data_generator() -> List[EvaluationRow]:
 
 
 @pytest.mark.skipif(os.environ.get("CI") == "true", reason="Only run this test locally (skipped in CI)")
-@pytest.mark.parametrize("completion_params", [{"model": "fireworks_ai/accounts/fireworks/models/kimi-k2-instruct"}])
+@pytest.mark.parametrize("completion_params", [{"model": "gpt-4o"}])
 @evaluation_test(
     data_loaders=DynamicDataLoader(
         generators=[remote_langfuse_data_generator],
@@ -115,6 +111,8 @@ async def test_remote_rollout_and_fetch_langfuse(row: EvaluationRow) -> Evaluati
     - fetch traces from Langfuse filtered by metadata via output_data_loader; FAIL if none found
     """
     assert row.messages[0].content == "Hello there! Please say hi back.", "Row should have correct message content"
+    assert len(row.messages) > 1, "Row should have a response. If this fails, we fellback to the original row."
+
     assert row.execution_metadata.rollout_id in ROLLOUT_IDS, (
         f"Row rollout_id {row.execution_metadata.rollout_id} should be in tracked rollout_ids: {ROLLOUT_IDS}"
     )

From 21db77ce16e81e3bddf0dad2fe0a34f8201172b6 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Thu, 25 Sep 2025 15:33:32 -0700
Subject: [PATCH 09/12] add types

---
 eval_protocol/__init__.py                     | 12 +++
 .../pytest/remote_rollout_processor.py        |  6 --
 .../types/remote_rollout_processor.py         | 45 ++++++++++
 tests/chinook/langfuse/remote_server.py       | 89 ++++++-------------
 .../langfuse/test_remote_langfuse_chinook.py  | 64 +++----------
 5 files changed, 96 insertions(+), 120 deletions(-)
 create mode 100644 eval_protocol/types/remote_rollout_processor.py

diff --git a/eval_protocol/__init__.py b/eval_protocol/__init__.py
index e554699a..46d8a265 100644
--- a/eval_protocol/__init__.py
+++ b/eval_protocol/__init__.py
@@ -62,6 +62,13 @@
 except ImportError:
     LangSmithAdapter = None
 
+# Remote server types
+from .types.remote_rollout_processor import (
+    InitRequest,
+    RolloutMetadata,
+    StatusResponse,
+    create_langfuse_config_tags,
+)
 
 warnings.filterwarnings("default", category=DeprecationWarning, module="eval_protocol")
 
@@ -110,6 +117,11 @@
     # Submodules
     "rewards",
     "mcp",
+    # Remote server types
+    "InitRequest",
+    "RolloutMetadata",
+    "StatusResponse",
+    "create_langfuse_config_tags",
 ]
 
 from . import _version
diff --git a/eval_protocol/pytest/remote_rollout_processor.py b/eval_protocol/pytest/remote_rollout_processor.py
index 9188a078..020ea9c5 100644
--- a/eval_protocol/pytest/remote_rollout_processor.py
+++ b/eval_protocol/pytest/remote_rollout_processor.py
@@ -28,7 +28,6 @@ class RemoteRolloutProcessor(RolloutProcessor):
           "run_id": str | null,
           "row_id": str | null
         },
-        "num_turns": int
       }
       Returns: {"ok": true}
 
@@ -40,7 +39,6 @@ def __init__(
         self,
         *,
         remote_base_url: Optional[str] = None,
-        num_turns: int = 2,
         poll_interval: float = 1.0,
         timeout_seconds: float = 120.0,
         output_data_loader: Callable[[str], DynamicDataLoader],
@@ -48,7 +46,6 @@ def __init__(
         # Prefer constructor-provided configuration. These can be overridden via
         # config.kwargs at call time for backward compatibility.
         self._remote_base_url = remote_base_url
-        self._num_turns = num_turns
         self._poll_interval = poll_interval
         self._timeout_seconds = timeout_seconds
         self._output_data_loader = output_data_loader
@@ -58,7 +55,6 @@ def __call__(self, rows: List[EvaluationRow], config: RolloutProcessorConfig) ->
 
         # Start with constructor values
         remote_base_url: Optional[str] = self._remote_base_url
-        num_turns: int = self._num_turns
         poll_interval: float = self._poll_interval
         timeout_seconds: float = self._timeout_seconds
 
@@ -66,7 +62,6 @@ def __call__(self, rows: List[EvaluationRow], config: RolloutProcessorConfig) ->
         if config.kwargs:
             if remote_base_url is None:
                 remote_base_url = config.kwargs.get("remote_base_url", remote_base_url)
-            num_turns = int(config.kwargs.get("num_turns", num_turns))
             poll_interval = float(config.kwargs.get("poll_interval", poll_interval))
             timeout_seconds = float(config.kwargs.get("timeout_seconds", timeout_seconds))
 
@@ -121,7 +116,6 @@ async def _process_row(row: EvaluationRow) -> EvaluationRow:
                 "messages": clean_messages,
                 "tools": row.tools,
                 "metadata": meta,
-                "num_turns": num_turns,
             }
 
             # Fire-and-poll
diff --git a/eval_protocol/types/remote_rollout_processor.py b/eval_protocol/types/remote_rollout_processor.py
new file mode 100644
index 00000000..405692d1
--- /dev/null
+++ b/eval_protocol/types/remote_rollout_processor.py
@@ -0,0 +1,45 @@
+"""
+Request and response models for remote rollout processor servers.
+"""
+
+from typing import Any, Dict, List, Optional
+from pydantic import BaseModel, Field
+from eval_protocol.models import Message
+
+
+class RolloutMetadata(BaseModel):
+    """Metadata for rollout execution."""
+
+    invocation_id: str
+    experiment_id: str
+    rollout_id: str
+    run_id: str
+    row_id: str
+
+
+class InitRequest(BaseModel):
+    """Request model for POST /init endpoint."""
+
+    rollout_id: str
+    model: str
+    messages: List[Message] = Field(min_length=1)
+    tools: Optional[List[Dict[str, Any]]] = None
+    metadata: RolloutMetadata
+
+
+class StatusResponse(BaseModel):
+    """Response model for GET /status endpoint."""
+
+    terminated: bool
+
+
+def create_langfuse_config_tags(init_request: InitRequest) -> List[str]:
+    """Create Langfuse tags from InitRequest metadata."""
+    metadata = init_request.metadata
+    return [
+        f"invocation_id:{metadata.invocation_id}",
+        f"experiment_id:{metadata.experiment_id}",
+        f"rollout_id:{metadata.rollout_id}",
+        f"run_id:{metadata.run_id}",
+        f"row_id:{metadata.row_id}",
+    ]
diff --git a/tests/chinook/langfuse/remote_server.py b/tests/chinook/langfuse/remote_server.py
index 0a83c9e0..4c951008 100644
--- a/tests/chinook/langfuse/remote_server.py
+++ b/tests/chinook/langfuse/remote_server.py
@@ -1,37 +1,32 @@
 import os
 import threading
-from typing import Any, Dict
+from typing import Any, Dict, List
 
 import uvicorn
 from fastapi import FastAPI, HTTPException
-from pydantic import BaseModel
 from langfuse.openai import openai  # pyright: ignore[reportPrivateImportUsage]
 
-
-app = FastAPI()
+from eval_protocol.types.remote_rollout_processor import (
+    InitRequest,
+    StatusResponse,
+    create_langfuse_config_tags,
+)
+from eval_protocol.models import Message
 
 
-class InitRequest(BaseModel):
-    rollout_id: str
-    model: str
-    messages: list[dict]
-    tools: list[dict] | None = None
-    metadata: dict
-    num_turns: int = 2
+app = FastAPI()
 
 
 _STATE: Dict[str, Dict[str, Any]] = {}
 
-
 ALLOWED_MESSAGE_FIELDS = {"role", "content", "tool_calls", "tool_call_id", "name"}
 
 
-def _clean_messages_for_api(messages: list[dict]) -> list[dict]:
+def _clean_messages_for_api(messages: List[Message]) -> list[dict]:
     cleaned: list[dict] = []
     for msg in messages:
-        if not isinstance(msg, dict):
-            continue
-        cm = {k: v for k, v in msg.items() if k in ALLOWED_MESSAGE_FIELDS and v is not None}
+        msg_dict = msg.model_dump()
+        cm = {k: v for k, v in msg_dict.items() if k in ALLOWED_MESSAGE_FIELDS and v is not None}
         # Some providers dislike empty content on assistant messages; keep if present
         cleaned.append(cm)
     return cleaned
@@ -42,53 +37,25 @@ def init(req: InitRequest):
     # Persist state
     _STATE[req.rollout_id] = {"terminated": False}
 
-    # Kick off worker thread that runs multi-turn chat via Langfuse OpenAI integration
+    # Kick off worker thread that does a single-turn chat via Langfuse OpenAI integration
     def _worker():
         try:
-            # Prepare tags for Langfuse filtering
-            metadata = {
-                "langfuse_tags": [
-                    f"invocation_id:{req.metadata.get('invocation_id')}",
-                    f"experiment_id:{req.metadata.get('experiment_id')}",
-                    f"rollout_id:{req.metadata.get('rollout_id')}",
-                    f"run_id:{req.metadata.get('run_id')}",
-                    f"row_id:{req.metadata.get('row_id')}",
-                ]
+            metadata = {"langfuse_tags": create_langfuse_config_tags(req)}
+
+            completion_kwargs = {
+                "model": req.model,
+                "messages": _clean_messages_for_api(req.messages),
+                "metadata": metadata,
             }
 
-            messages = req.messages
-
-            # Simulate N-1 assistant turns (single-shot or simple echo)
-            for _ in range(max(1, req.num_turns)):
-                completion_kwargs = {
-                    "model": req.model,
-                    "messages": _clean_messages_for_api(messages),
-                    "metadata": metadata,
-                }
-
-                if req.tools:
-                    completion_kwargs["tools"] = req.tools
-
-                completion = openai.chat.completions.create(**completion_kwargs)
-                assistant_message = completion.choices[0].message
-
-                # Convert to dict format for next turn
-                assistant_dict = {"role": "assistant", "content": assistant_message.content}
-                if assistant_message.tool_calls:
-                    assistant_dict["tool_calls"] = [
-                        {
-                            "id": tc.id,
-                            "type": tc.type,
-                            "function": {"name": tc.function.name, "arguments": tc.function.arguments},
-                        }
-                        for tc in assistant_message.tool_calls
-                    ]
-
-                # Append assistant for next turn
-                messages = messages + [assistant_dict]
-
-        except Exception:
+            if req.tools:
+                completion_kwargs["tools"] = req.tools
+
+            completion = openai.chat.completions.create(**completion_kwargs)
+
+        except Exception as e:
             # Best-effort; mark as done even on error to unblock polling
+            print(f"❌ Error in rollout {req.rollout_id}: {e}")
             pass
         finally:
             _STATE[req.rollout_id]["terminated"] = True
@@ -98,12 +65,12 @@ def _worker():
     return {"ok": True}
 
 
-@app.get("/status")
-def status(rollout_id: str):
+@app.get("/status", response_model=StatusResponse)
+def status(rollout_id: str) -> StatusResponse:
     st = _STATE.get(rollout_id)
     if not st:
         raise HTTPException(status_code=404, detail="unknown rollout_id")
-    return {"terminated": bool(st.get("terminated", False))}
+    return StatusResponse(terminated=bool(st.get("terminated", False)))
 
 
 def main():
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook.py b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
index e5ea0eed..b82722e0 100644
--- a/tests/chinook/langfuse/test_remote_langfuse_chinook.py
+++ b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
@@ -1,12 +1,14 @@
+# MANUAL SERVER STARTUP REQUIRED:
+# Before running this test, start the remote server manually:
+# cd /Users/derekxu/Documents/code/python-sdk
+# python -m tests.chinook.langfuse.remote_server
+#
+# The server should be running on http://127.0.0.1:7077
+
 import os
-import multiprocessing
-import time
-from datetime import datetime, timedelta
 from typing import List
-import atexit
 
 import pytest
-import requests
 
 from eval_protocol.data_loader.dynamic_data_loader import DynamicDataLoader
 from eval_protocol.models import EvaluationRow, Message
@@ -33,7 +35,7 @@ def fetch_langfuse_traces(rollout_id: str) -> List[EvaluationRow]:
     ROLLOUT_IDS.add(rollout_id)
 
     adapter = create_langfuse_adapter()
-    return adapter.get_evaluation_rows(tags=[f"rollout_id:{rollout_id}"])
+    return adapter.get_evaluation_rows(tags=[f"rollout_id:{rollout_id}"], max_retries=5)
 
 
 def langfuse_output_data_loader(rollout_id: str) -> DynamicDataLoader:
@@ -42,51 +44,8 @@ def langfuse_output_data_loader(rollout_id: str) -> DynamicDataLoader:
     )
 
 
-def _start_remote_server():
-    # Starts FastAPI server defined in remote_server.py using absolute import
-    import importlib
-
-    os.environ.setdefault("REMOTE_SERVER_HOST", "127.0.0.1")
-    os.environ.setdefault("REMOTE_SERVER_PORT", "7077")
-    mod = importlib.import_module("tests.chinook.langfuse.remote_server")
-    mod.main()
-
-
-def _ensure_server_running():
-    host = os.getenv("REMOTE_SERVER_HOST", "127.0.0.1")
-    port = int(os.getenv("REMOTE_SERVER_PORT", "7077"))
-    base_url = f"http://{host}:{port}"
-
-    def _is_up() -> bool:
-        try:
-            r = requests.get(f"{base_url}/status", params={"rollout_id": "ping"}, timeout=1.0)
-            return r.status_code in (200, 404)
-        except Exception:
-            return False
-
-    if _is_up():
-        return None
-
-    # Launch in a background process
-    proc = multiprocessing.Process(target=_start_remote_server, daemon=True)
-    proc.start()
-
-    # Poll for readiness up to 10s
-    deadline = time.time() + 10
-    while time.time() < deadline:
-        if _is_up():
-            break
-        time.sleep(0.5)
-    return proc
-
-
 def remote_langfuse_data_generator() -> List[EvaluationRow]:
-    # Ensure server is running BEFORE rollouts start (evaluation_test triggers rollouts before test body)
-    _SERVER_PROC = _ensure_server_running()
-    atexit.register(lambda: (_SERVER_PROC and _SERVER_PROC.is_alive() and _SERVER_PROC.terminate()))
-
-    # Minimal single-user-turn message to trigger a response
-    row = EvaluationRow(messages=[Message(role="user", content="Hello there! Please say hi back.")])
+    row = EvaluationRow(messages=[Message(role="user", content="What is the capital of France?")])
     return [row, row, row]
 
 
@@ -98,7 +57,6 @@ def remote_langfuse_data_generator() -> List[EvaluationRow]:
     ),
     rollout_processor=RemoteRolloutProcessor(
         remote_base_url="http://127.0.0.1:7077",
-        num_turns=2,
         timeout_seconds=30,
         output_data_loader=langfuse_output_data_loader,
     ),
@@ -106,11 +64,11 @@ def remote_langfuse_data_generator() -> List[EvaluationRow]:
 async def test_remote_rollout_and_fetch_langfuse(row: EvaluationRow) -> EvaluationRow:
     """
     End-to-end test:
-    - remote server started at import time
+    - REQUIRES MANUAL SERVER STARTUP: python -m tests.chinook.langfuse.remote_server
     - trigger remote rollout via RemoteRolloutProcessor (calls init/status)
     - fetch traces from Langfuse filtered by metadata via output_data_loader; FAIL if none found
     """
-    assert row.messages[0].content == "Hello there! Please say hi back.", "Row should have correct message content"
+    assert row.messages[0].content == "What is the capital of France?", "Row should have correct message content"
     assert len(row.messages) > 1, "Row should have a response. If this fails, we fellback to the original row."
 
     assert row.execution_metadata.rollout_id in ROLLOUT_IDS, (

From aa8ee84d3d28e35d86bd9a463527ea0acc1996a8 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Thu, 25 Sep 2025 15:37:52 -0700
Subject: [PATCH 10/12] clean up

---
 tests/chinook/langfuse/remote_server.py                | 1 -
 tests/chinook/langfuse/test_remote_langfuse_chinook.py | 4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/tests/chinook/langfuse/remote_server.py b/tests/chinook/langfuse/remote_server.py
index 4c951008..2add76c1 100644
--- a/tests/chinook/langfuse/remote_server.py
+++ b/tests/chinook/langfuse/remote_server.py
@@ -62,7 +62,6 @@ def _worker():
 
     t = threading.Thread(target=_worker, daemon=True)
     t.start()
-    return {"ok": True}
 
 
 @app.get("/status", response_model=StatusResponse)
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook.py b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
index b82722e0..cdcd68fb 100644
--- a/tests/chinook/langfuse/test_remote_langfuse_chinook.py
+++ b/tests/chinook/langfuse/test_remote_langfuse_chinook.py
@@ -44,7 +44,7 @@ def langfuse_output_data_loader(rollout_id: str) -> DynamicDataLoader:
     )
 
 
-def remote_langfuse_data_generator() -> List[EvaluationRow]:
+def rows() -> List[EvaluationRow]:
     row = EvaluationRow(messages=[Message(role="user", content="What is the capital of France?")])
     return [row, row, row]
 
@@ -53,7 +53,7 @@ def remote_langfuse_data_generator() -> List[EvaluationRow]:
 @pytest.mark.parametrize("completion_params", [{"model": "gpt-4o"}])
 @evaluation_test(
     data_loaders=DynamicDataLoader(
-        generators=[remote_langfuse_data_generator],
+        generators=[rows],
     ),
     rollout_processor=RemoteRolloutProcessor(
         remote_base_url="http://127.0.0.1:7077",

From 4de4d9e5665654743dadfad94ad956db81152aa4 Mon Sep 17 00:00:00 2001
From: Dylan Huang <dhuang@fireworks.ai>
Date: Thu, 25 Sep 2025 15:39:27 -0700
Subject: [PATCH 11/12] add typescript simple example (#218)

* add typescript simple example

* publish npm package for eval protocol (#219)

* publish typescript SDK

* add createLangfuseConfigTags function and update version to 0.1.1

* use eval-protocol npm dependency

* refactor statusInfoSchema to use a record type and update version to 0.1.2

* add eval_metadata to langfuse_row in RemoteRolloutProcessor

* Refactor data generator function name and update eval-protocol version to 0.1.2

* done
---
 .../pytest/remote_rollout_processor.py        |    1 +
 ...test_remote_langfuse_chinook_typescript.py |   75 +
 .../langfuse/typescript-server/.gitignore     |    1 +
 .../langfuse/typescript-server/README.md      |  151 ++
 .../chinook/langfuse/typescript-server/env.ts |   31 +
 .../typescript-server/instrumentation.ts      |   15 +
 .../langfuse/typescript-server/package.json   |   38 +
 .../langfuse/typescript-server/pnpm-lock.yaml | 1828 +++++++++++++++++
 .../langfuse/typescript-server/server.ts      |  203 ++
 .../langfuse/typescript-server/tsconfig.json  |   30 +
 .../use-bun-instead-of-node-vite-npm-pnpm.mdc |  111 +
 typescript/.gitignore                         |   36 +
 typescript/README.md                          |   13 +
 typescript/bun.lock                           |   37 +
 typescript/index.ts                           |  104 +
 typescript/package.json                       |   16 +
 typescript/tsconfig.json                      |   29 +
 17 files changed, 2719 insertions(+)
 create mode 100644 tests/chinook/langfuse/test_remote_langfuse_chinook_typescript.py
 create mode 100644 tests/chinook/langfuse/typescript-server/.gitignore
 create mode 100644 tests/chinook/langfuse/typescript-server/README.md
 create mode 100644 tests/chinook/langfuse/typescript-server/env.ts
 create mode 100644 tests/chinook/langfuse/typescript-server/instrumentation.ts
 create mode 100644 tests/chinook/langfuse/typescript-server/package.json
 create mode 100644 tests/chinook/langfuse/typescript-server/pnpm-lock.yaml
 create mode 100644 tests/chinook/langfuse/typescript-server/server.ts
 create mode 100644 tests/chinook/langfuse/typescript-server/tsconfig.json
 create mode 100644 typescript/.cursor/rules/use-bun-instead-of-node-vite-npm-pnpm.mdc
 create mode 100644 typescript/.gitignore
 create mode 100644 typescript/README.md
 create mode 100644 typescript/bun.lock
 create mode 100644 typescript/index.ts
 create mode 100644 typescript/package.json
 create mode 100644 typescript/tsconfig.json

diff --git a/eval_protocol/pytest/remote_rollout_processor.py b/eval_protocol/pytest/remote_rollout_processor.py
index 020ea9c5..5efa793e 100644
--- a/eval_protocol/pytest/remote_rollout_processor.py
+++ b/eval_protocol/pytest/remote_rollout_processor.py
@@ -167,6 +167,7 @@ def _load_data():
             elif len(output_rows) == 1:  # Return the Langfuse row
                 langfuse_row = output_rows[0]
                 langfuse_row.input_metadata.completion_params = row.input_metadata.completion_params
+                langfuse_row.eval_metadata = row.eval_metadata
                 return langfuse_row
             else:
                 raise ValueError("RemoteRolloutProcessor's output_data_loader should return exactly one row.")
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook_typescript.py b/tests/chinook/langfuse/test_remote_langfuse_chinook_typescript.py
new file mode 100644
index 00000000..bb3b7bf5
--- /dev/null
+++ b/tests/chinook/langfuse/test_remote_langfuse_chinook_typescript.py
@@ -0,0 +1,75 @@
+import os
+from typing import List
+import atexit
+
+import pytest
+
+from eval_protocol.data_loader.dynamic_data_loader import DynamicDataLoader
+from eval_protocol.models import EvaluationRow, Message
+from eval_protocol.pytest import evaluation_test
+from eval_protocol.pytest.remote_rollout_processor import RemoteRolloutProcessor
+from eval_protocol.adapters.langfuse import create_langfuse_adapter
+from eval_protocol.quickstart.utils import filter_longest_conversation
+
+ROLLOUT_IDS = set()
+
+
+@pytest.fixture(autouse=True)
+def check_rollout_coverage():
+    """Ensure we processed all expected rollout_ids"""
+    global ROLLOUT_IDS
+    ROLLOUT_IDS.clear()
+    yield
+
+    # Verify we've seen the expected number of rollout_ids after test is done
+    expected_rollout_count = 3
+    assert len(ROLLOUT_IDS) == expected_rollout_count, (
+        f"Expected to see {expected_rollout_count} rollout_ids, but only saw {len(ROLLOUT_IDS)}: {ROLLOUT_IDS}"
+    )
+
+
+def fetch_langfuse_traces(rollout_id: str) -> List[EvaluationRow]:
+    global ROLLOUT_IDS  # Track all rollout_ids we've seen
+    ROLLOUT_IDS.add(rollout_id)
+
+    adapter = create_langfuse_adapter()
+    return adapter.get_evaluation_rows(tags=[f"rollout_id:{rollout_id}"])
+
+
+def langfuse_output_data_loader(rollout_id: str) -> DynamicDataLoader:
+    return DynamicDataLoader(
+        generators=[lambda: fetch_langfuse_traces(rollout_id)], preprocess_fn=filter_longest_conversation
+    )
+
+
+def rows() -> List[EvaluationRow]:
+    # Minimal single-user-turn message to trigger a response
+    row = EvaluationRow(messages=[Message(role="user", content="What is the capital of France?")])
+    return [row, row, row]
+
+
+@pytest.mark.skipif(os.environ.get("CI") == "true", reason="Only run this test locally (skipped in CI)")
+@pytest.mark.parametrize("completion_params", [{"model": "gpt-5"}])
+@evaluation_test(
+    data_loaders=DynamicDataLoader(
+        generators=[rows],
+    ),
+    rollout_processor=RemoteRolloutProcessor(
+        remote_base_url="http://127.0.0.1:3000",
+        timeout_seconds=30,
+        output_data_loader=langfuse_output_data_loader,
+    ),
+)
+async def test_remote_rollout_and_fetch_langfuse_typescript(row: EvaluationRow) -> EvaluationRow:
+    """
+    End-to-end test:
+    - remote server started at import time
+    - trigger remote rollout via RemoteRolloutProcessor (calls init/status)
+    - fetch traces from Langfuse filtered by metadata via output_data_loader; FAIL if none found
+    """
+    assert row.messages[0].content == "What is the capital of France?", "Row should have correct message content"
+    assert row.execution_metadata.rollout_id in ROLLOUT_IDS, (
+        f"Row rollout_id {row.execution_metadata.rollout_id} should be in tracked rollout_ids: {ROLLOUT_IDS}"
+    )
+
+    return row
diff --git a/tests/chinook/langfuse/typescript-server/.gitignore b/tests/chinook/langfuse/typescript-server/.gitignore
new file mode 100644
index 00000000..803352ef
--- /dev/null
+++ b/tests/chinook/langfuse/typescript-server/.gitignore
@@ -0,0 +1 @@
+!package.json
diff --git a/tests/chinook/langfuse/typescript-server/README.md b/tests/chinook/langfuse/typescript-server/README.md
new file mode 100644
index 00000000..434b82a8
--- /dev/null
+++ b/tests/chinook/langfuse/typescript-server/README.md
@@ -0,0 +1,151 @@
+# TypeScript Express Server for Remote Rollout Processor
+
+This TypeScript Express server implements the Remote Rollout Processor API contract as specified in the Eval Protocol documentation.
+
+## Features
+
+- **POST /init** - Initialize a rollout with validation using Zod schemas
+- **GET /status** - Check the status of a rollout
+- **GET /health** - Health check endpoint
+- Full TypeScript support with strict type checking
+- Request validation using Zod
+- Error handling and logging
+- CORS and security middleware
+
+## Installation
+
+```bash
+pnpm install
+```
+
+## Development
+
+```bash
+# Run in development mode with hot reload
+pnpm run dev
+
+# Build for production
+pnpm run build
+
+# Run production build
+pnpm run start
+```
+
+## API Endpoints
+
+### POST /init
+
+Initialize a new rollout.
+
+**Request Body:**
+```json
+{
+  "rollout_id": "rll_ijkl",
+  "model": "openai/gpt-4o",
+  "messages": [
+    { "role": "user", "content": "Hello" }
+  ],
+  "tools": null,
+  "metadata": {
+    "invocation_id": "ivk_abcd",
+    "experiment_id": "exp_efgh",
+    "rollout_id": "rll_ijkl",
+    "run_id": "run_123",
+    "row_id": "row_123"
+  },
+  "num_turns": 2
+}
+```
+
+**Response:**
+```json
+{
+  "status": "accepted",
+  "rollout_id": "rll_ijkl",
+  "message": "Rollout initialized successfully"
+}
+```
+
+### GET /status
+
+Check the status of a rollout.
+
+**Query Parameters:**
+- `rollout_id` (required): The ID of the rollout to check
+
+**Response (Running):**
+```json
+{
+  "terminated": false
+}
+```
+
+**Response (Completed):**
+```json
+{
+  "terminated": true,
+  "info": {
+    "reason": "completed",
+    "ended_at": "2025-01-24T12:34:56Z",
+    "num_turns": 2
+  }
+}
+```
+
+### GET /health
+
+Health check endpoint.
+
+**Response:**
+```json
+{
+  "status": "healthy",
+  "timestamp": "2025-01-24T12:34:56Z"
+}
+```
+
+## Usage with Eval Protocol
+
+This server can be used with the Eval Protocol's `RemoteRolloutProcessor`:
+
+```python
+from eval_protocol import (
+    evaluation_test,
+    DynamicDataLoader,
+    RemoteRolloutProcessor,
+)
+
+@pytest.mark.parametrize("completion_params", [{"model": "openai/gpt-4o"}])
+@evaluation_test(
+    data_loaders=[InlineDataLoader(messages=[[Message(role="user", content="Hello")]])],
+    rollout_processor=RemoteRolloutProcessor(
+        remote_base_url="http://localhost:3000",
+        output_data_loader=create_output_data_loader,
+    )
+)
+def test_remote_http(row: EvaluationRow) -> EvaluationRow:
+    return row
+```
+
+## Configuration
+
+The server runs on port 3000 by default. You can change this by setting the `PORT` environment variable:
+
+```bash
+PORT=8080 pnpm run dev
+```
+
+## Error Handling
+
+The server includes comprehensive error handling:
+- Request validation errors return 400 with detailed error messages
+- Missing rollout IDs return 404
+- Server errors return 500 with error details
+- All errors are logged to the console
+
+## Development Notes
+
+- The server simulates async rollout execution with a 1-second delay per turn
+- Rollout states are stored in memory (not persistent across restarts)
+- All requests are validated using Zod schemas
+- TypeScript strict mode is enabled for better type safety
diff --git a/tests/chinook/langfuse/typescript-server/env.ts b/tests/chinook/langfuse/typescript-server/env.ts
new file mode 100644
index 00000000..202f673d
--- /dev/null
+++ b/tests/chinook/langfuse/typescript-server/env.ts
@@ -0,0 +1,31 @@
+import * as dotenv from "dotenv";
+
+// Helper to resolve the root of the repo (for .env loading, etc.)
+import path from "path";
+import { fileURLToPath } from "url";
+import fs from "fs";
+
+// Returns the absolute path to the root of the repo (where .git or .env is found)
+function getRepoRoot(): string {
+  // __dirname is not available in ES modules, so use fileURLToPath
+  const currentDir = path.dirname(fileURLToPath(import.meta.url));
+  let dir = currentDir;
+  while (true) {
+    if (
+      fs.existsSync(path.join(dir, ".git")) ||
+      fs.existsSync(path.join(dir, ".env"))
+    ) {
+      return dir;
+    }
+    const parent = path.dirname(dir);
+    if (parent === dir) break;
+    dir = parent;
+  }
+  // Fallback to current directory if not found
+  return currentDir;
+}
+
+export const REPO_ROOT = getRepoRoot();
+
+// Load environment variables from .env at the root of the repo
+dotenv.config({ path: path.join(REPO_ROOT, ".env") });
diff --git a/tests/chinook/langfuse/typescript-server/instrumentation.ts b/tests/chinook/langfuse/typescript-server/instrumentation.ts
new file mode 100644
index 00000000..5918ac32
--- /dev/null
+++ b/tests/chinook/langfuse/typescript-server/instrumentation.ts
@@ -0,0 +1,15 @@
+import { NodeSDK } from "@opentelemetry/sdk-node";
+import { LangfuseSpanProcessor } from "@langfuse/otel";
+import "./env";
+
+const sdk = new NodeSDK({
+  spanProcessors: [
+    new LangfuseSpanProcessor({
+      publicKey: process.env["LANGFUSE_PUBLIC_KEY"]!,
+      secretKey: process.env["LANGFUSE_SECRET_KEY"]!,
+      baseUrl: process.env["LANGFUSE_HOST"]!,
+    }),
+  ],
+});
+
+sdk.start();
diff --git a/tests/chinook/langfuse/typescript-server/package.json b/tests/chinook/langfuse/typescript-server/package.json
new file mode 100644
index 00000000..7e64fee5
--- /dev/null
+++ b/tests/chinook/langfuse/typescript-server/package.json
@@ -0,0 +1,38 @@
+{
+  "name": "typescript-server",
+  "version": "1.0.0",
+  "description": "TypeScript Express server for Remote Rollout Processor",
+  "main": "dist/server.js",
+  "type": "module",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/server.js",
+    "dev": "tsx server.ts",
+    "test": "node test-server.js",
+    "test:server": "node test-server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "packageManager": "pnpm@10.6.2",
+  "dependencies": {
+    "@langfuse/openai": "^4.2.0",
+    "@langfuse/otel": "^4.2.0",
+    "@langfuse/tracing": "^4.2.0",
+    "@opentelemetry/sdk-node": "^0.205.0",
+    "cors": "^2.8.5",
+    "dotenv": "^17.2.2",
+    "eval-protocol": "^0.1.2",
+    "express": "^5.1.0",
+    "helmet": "^7.1.0",
+    "openai": "^5.23.0"
+  },
+  "devDependencies": {
+    "@types/cors": "^2.8.17",
+    "@types/express": "^4.17.23",
+    "@types/node": "^20.10.0",
+    "tsx": "^4.6.0",
+    "typescript": "^5.9.2",
+    "zod": "^3.22.4"
+  }
+}
diff --git a/tests/chinook/langfuse/typescript-server/pnpm-lock.yaml b/tests/chinook/langfuse/typescript-server/pnpm-lock.yaml
new file mode 100644
index 00000000..a105871d
--- /dev/null
+++ b/tests/chinook/langfuse/typescript-server/pnpm-lock.yaml
@@ -0,0 +1,1828 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    dependencies:
+      '@langfuse/openai':
+        specifier: ^4.2.0
+        version: 4.2.0(@opentelemetry/api@1.9.0)
+      '@langfuse/otel':
+        specifier: ^4.2.0
+        version: 4.2.0(@opentelemetry/api@1.9.0)(@opentelemetry/core@2.1.0(@opentelemetry/api@1.9.0))(@opentelemetry/exporter-trace-otlp-http@0.205.0(@opentelemetry/api@1.9.0))(@opentelemetry/sdk-trace-base@2.1.0(@opentelemetry/api@1.9.0))
+      '@langfuse/tracing':
+        specifier: ^4.2.0
+        version: 4.2.0(@opentelemetry/api@1.9.0)
+      '@opentelemetry/sdk-node':
+        specifier: ^0.205.0
+        version: 0.205.0(@opentelemetry/api@1.9.0)
+      cors:
+        specifier: ^2.8.5
+        version: 2.8.5
+      dotenv:
+        specifier: ^17.2.2
+        version: 17.2.2
+      eval-protocol:
+        specifier: ^0.1.2
+        version: 0.1.2(typescript@5.9.2)
+      express:
+        specifier: ^5.1.0
+        version: 5.1.0
+      helmet:
+        specifier: ^7.1.0
+        version: 7.2.0
+      openai:
+        specifier: ^5.23.0
+        version: 5.23.0(zod@3.25.76)
+    devDependencies:
+      '@types/cors':
+        specifier: ^2.8.17
+        version: 2.8.19
+      '@types/express':
+        specifier: ^4.17.23
+        version: 4.17.23
+      '@types/node':
+        specifier: ^20.10.0
+        version: 20.19.17
+      tsx:
+        specifier: ^4.6.0
+        version: 4.20.5
+      typescript:
+        specifier: ^5.9.2
+        version: 5.9.2
+      zod:
+        specifier: ^3.22.4
+        version: 3.25.76
+
+packages:
+
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+      zod: 4.1.11
+
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diff --git a/tests/chinook/langfuse/typescript-server/server.ts b/tests/chinook/langfuse/typescript-server/server.ts
new file mode 100644
index 00000000..0f14f58c
--- /dev/null
+++ b/tests/chinook/langfuse/typescript-server/server.ts
@@ -0,0 +1,203 @@
+import express, { Request, Response } from "express";
+import cors from "cors";
+import helmet from "helmet";
+import { z } from "zod";
+import { OpenAI } from "openai";
+import { observeOpenAI } from "@langfuse/openai";
+import "./instrumentation";
+import "./env";
+import {
+  initRequestSchema,
+  statusResponseSchema,
+  StatusResponse,
+  initRequestToCompletionParams,
+  InitRequest,
+  createLangfuseConfigTags,
+} from "eval-protocol";
+
+// In-memory storage for rollout states
+interface RolloutState {
+  rollout_id: string;
+  status: "running" | "completed" | "failed" | "timeout" | "cancelled";
+  started_at: string;
+  ended_at?: string;
+  completed_turns: number;
+  error?: string;
+}
+
+const rolloutStates = new Map<string, RolloutState>();
+
+// Express app setup
+const app: express.Application = express();
+const PORT = process.env["PORT"] || 3000;
+
+// Middleware
+app.use(helmet());
+app.use(cors());
+app.use(express.json());
+
+// Health check endpoint
+app.get("/health", (_req: Request, res: Response) => {
+  res.json({ status: "healthy", timestamp: new Date().toISOString() });
+});
+
+// POST /init endpoint
+app.post("/init", async (req: Request, res: Response) => {
+  try {
+    // Validate request body
+    const validatedData = initRequestSchema.parse(req.body);
+    const { rollout_id, model } = validatedData;
+
+    console.log(`Initializing rollout ${rollout_id} with model ${model}`);
+
+    // Create rollout state
+    const rolloutState: RolloutState = {
+      rollout_id,
+      status: "running",
+      started_at: new Date().toISOString(),
+      completed_turns: 0,
+    };
+
+    rolloutStates.set(rollout_id, rolloutState);
+
+    // Simulate async processing
+    setTimeout(async () => {
+      await simulateRolloutExecution(validatedData);
+    }, 100);
+
+    res.status(200).json({
+      status: "accepted",
+      rollout_id,
+      message: "Rollout initialized successfully",
+    });
+  } catch (error) {
+    console.error("Error in /init endpoint:", error);
+
+    if (error instanceof z.ZodError) {
+      res.status(400).json({
+        error: "Validation error",
+        details: error.errors,
+      });
+    } else {
+      res.status(500).json({
+        error: "Internal server error",
+        message: error instanceof Error ? error.message : "Unknown error",
+      });
+    }
+  }
+});
+
+// GET /status endpoint
+app.get("/status", (req: Request, res: Response) => {
+  try {
+    const { rollout_id } = req.query;
+
+    if (!rollout_id || typeof rollout_id !== "string") {
+      res.status(400).json({
+        error: "Missing or invalid rollout_id parameter",
+      });
+      return;
+    }
+
+    const rolloutState = rolloutStates.get(rollout_id);
+
+    if (!rolloutState) {
+      res.status(404).json({
+        error: "Rollout not found",
+        rollout_id,
+      });
+      return;
+    }
+
+    const response: StatusResponse = {
+      terminated: rolloutState.status !== "running",
+    };
+
+    if (rolloutState.status !== "running") {
+      response.info = {
+        reason: rolloutState.status,
+        ended_at: rolloutState.ended_at || new Date().toISOString(),
+        ...(rolloutState.error && { error: rolloutState.error }),
+      };
+    }
+
+    const validatedResponse = statusResponseSchema.parse(response);
+
+    res.json(validatedResponse);
+  } catch (error) {
+    console.error("Error in /status endpoint:", error);
+    res.status(500).json({
+      error: "Internal server error",
+      message: error instanceof Error ? error.message : "Unknown error",
+    });
+  }
+});
+
+// Simulate rollout execution
+async function simulateRolloutExecution(
+  initRequest: InitRequest
+): Promise<void> {
+  const rolloutState = rolloutStates.get(initRequest.rollout_id);
+  if (!rolloutState) return;
+
+  try {
+    console.log(`Starting rollout execution for ${initRequest.rollout_id}`);
+
+    const openai = new OpenAI({
+      apiKey: process.env["OPENAI_API_KEY"],
+    });
+
+    const tracedOpenAI = observeOpenAI(openai, {
+      tags: createLangfuseConfigTags(initRequest),
+    });
+
+    const completionParams = initRequestToCompletionParams(initRequest);
+
+    await tracedOpenAI.chat.completions.create(completionParams);
+
+    // Mark as completed
+    rolloutState.status = "completed";
+    rolloutState.ended_at = new Date().toISOString();
+    rolloutState.completed_turns = 1;
+
+    console.log(`Rollout ${initRequest.rollout_id} completed successfully`);
+  } catch (error) {
+    console.error(
+      `Error in rollout execution for ${initRequest.rollout_id}:`,
+      error
+    );
+
+    rolloutState.status = "failed";
+    rolloutState.ended_at = new Date().toISOString();
+    rolloutState.error =
+      error instanceof Error ? error.message : "Unknown error";
+  }
+}
+
+// Error handling middleware
+app.use((error: Error, _req: Request, res: Response, _next: any) => {
+  console.error("Unhandled error:", error);
+  res.status(500).json({
+    error: "Internal server error",
+    message: error.message,
+  });
+});
+
+// 404 handler
+app.use((_req: Request, res: Response) => {
+  res.status(404).json({
+    error: "Not found",
+    path: _req.originalUrl,
+  });
+});
+
+// Start server
+app.listen(PORT, () => {
+  console.log(`🚀 TypeScript Express server running on port ${PORT}`);
+  console.log(`📋 Available endpoints:`);
+  console.log(`   POST /init - Initialize a rollout`);
+  console.log(`   GET /status?rollout_id={id} - Check rollout status`);
+  console.log(`   GET http://localhost:${PORT}/health - Health check`);
+});
+
+export default app;
diff --git a/tests/chinook/langfuse/typescript-server/tsconfig.json b/tests/chinook/langfuse/typescript-server/tsconfig.json
new file mode 100644
index 00000000..82ca67bc
--- /dev/null
+++ b/tests/chinook/langfuse/typescript-server/tsconfig.json
@@ -0,0 +1,30 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "lib": ["ES2020"],
+    "outDir": "./dist",
+    "rootDir": "./",
+    "strict": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "removeComments": false,
+    "noImplicitAny": true,
+    "noImplicitReturns": true,
+    "noImplicitThis": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "exactOptionalPropertyTypes": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noUncheckedIndexedAccess": true
+  },
+  "include": ["*.ts"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/typescript/.cursor/rules/use-bun-instead-of-node-vite-npm-pnpm.mdc b/typescript/.cursor/rules/use-bun-instead-of-node-vite-npm-pnpm.mdc
new file mode 100644
index 00000000..b8100b77
--- /dev/null
+++ b/typescript/.cursor/rules/use-bun-instead-of-node-vite-npm-pnpm.mdc
@@ -0,0 +1,111 @@
+---
+description: Use Bun instead of Node.js, npm, pnpm, or vite.
+globs: "*.ts, *.tsx, *.html, *.css, *.js, *.jsx, package.json"
+alwaysApply: false
+---
+
+Default to using Bun instead of Node.js.
+
+- Use `bun <file>` instead of `node <file>` or `ts-node <file>`
+- Use `bun test` instead of `jest` or `vitest`
+- Use `bun build <file.html|file.ts|file.css>` instead of `webpack` or `esbuild`
+- Use `bun install` instead of `npm install` or `yarn install` or `pnpm install`
+- Use `bun run <script>` instead of `npm run <script>` or `yarn run <script>` or `pnpm run <script>`
+- Bun automatically loads .env, so don't use dotenv.
+
+## APIs
+
+- `Bun.serve()` supports WebSockets, HTTPS, and routes. Don't use `express`.
+- `bun:sqlite` for SQLite. Don't use `better-sqlite3`.
+- `Bun.redis` for Redis. Don't use `ioredis`.
+- `Bun.sql` for Postgres. Don't use `pg` or `postgres.js`.
+- `WebSocket` is built-in. Don't use `ws`.
+- Prefer `Bun.file` over `node:fs`'s readFile/writeFile
+- Bun.$`ls` instead of execa.
+
+## Testing
+
+Use `bun test` to run tests.
+
+```ts#index.test.ts
+import { test, expect } from "bun:test";
+
+test("hello world", () => {
+  expect(1).toBe(1);
+});
+```
+
+## Frontend
+
+Use HTML imports with `Bun.serve()`. Don't use `vite`. HTML imports fully support React, CSS, Tailwind.
+
+Server:
+
+```ts#index.ts
+import index from "./index.html"
+
+Bun.serve({
+  routes: {
+    "/": index,
+    "/api/users/:id": {
+      GET: (req) => {
+        return new Response(JSON.stringify({ id: req.params.id }));
+      },
+    },
+  },
+  // optional websocket support
+  websocket: {
+    open: (ws) => {
+      ws.send("Hello, world!");
+    },
+    message: (ws, message) => {
+      ws.send(message);
+    },
+    close: (ws) => {
+      // handle close
+    }
+  },
+  development: {
+    hmr: true,
+    console: true,
+  }
+})
+```
+
+HTML files can import .tsx, .jsx or .js files directly and Bun's bundler will transpile & bundle automatically. `<link>` tags can point to stylesheets and Bun's CSS bundler will bundle.
+
+```html#index.html
+<html>
+  <body>
+    <h1>Hello, world!</h1>
+    <script type="module" src="./frontend.tsx"></script>
+  </body>
+</html>
+```
+
+With the following `frontend.tsx`:
+
+```tsx#frontend.tsx
+import React from "react";
+
+// import .css files directly and it works
+import './index.css';
+
+import { createRoot } from "react-dom/client";
+
+const root = createRoot(document.body);
+
+export default function Frontend() {
+  return <h1>Hello, world!</h1>;
+}
+
+root.render(<Frontend />);
+```
+
+Then, run index.ts
+
+```sh
+bun --hot ./index.ts
+```
+
+For more information, read the Bun API docs in `node_modules/bun-types/docs/**.md`.
diff --git a/typescript/.gitignore b/typescript/.gitignore
new file mode 100644
index 00000000..a0dd6762
--- /dev/null
+++ b/typescript/.gitignore
@@ -0,0 +1,36 @@
+# dependencies (bun install)
+node_modules
+
+# output
+out
+dist
+*.tgz
+
+# code coverage
+coverage
+*.lcov
+
+# logs
+logs
+_.log
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# caches
+.eslintcache
+.cache
+*.tsbuildinfo
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store
+
+!package.json
diff --git a/typescript/README.md b/typescript/README.md
new file mode 100644
index 00000000..03727695
--- /dev/null
+++ b/typescript/README.md
@@ -0,0 +1,13 @@
+# eval-protocol
+
+This is the TypeScript SDK for [eval-protocol](https://evalprotocol.io).
+
+It includes helpful Zod schemas. TypeScript types, and helper functions for
+creating a remote server for
+[RemoteRolloutProcessor](https://evalprotocol.io/tutorial/remote-rollout-processor).
+
+Installation
+
+```bash
+npm install eval-protocol
+```
diff --git a/typescript/bun.lock b/typescript/bun.lock
new file mode 100644
index 00000000..5401210e
--- /dev/null
+++ b/typescript/bun.lock
@@ -0,0 +1,37 @@
+{
+  "lockfileVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "eval-protocol",
+      "dependencies": {
+        "zod": "^4.1.11",
+      },
+      "devDependencies": {
+        "@types/bun": "latest",
+        "openai": "^5.23.0",
+      },
+      "peerDependencies": {
+        "typescript": "^5",
+      },
+    },
+  },
+  "packages": {
+    "@types/bun": ["@types/bun@1.2.22", "", { "dependencies": { "bun-types": "1.2.22" } }, "sha512-5A/KrKos2ZcN0c6ljRSOa1fYIyCKhZfIVYeuyb4snnvomnpFqC0tTsEkdqNxbAgExV384OETQ//WAjl3XbYqQA=="],
+
+    "@types/node": ["@types/node@24.5.2", "", { "dependencies": { "undici-types": "~7.12.0" } }, "sha512-FYxk1I7wPv3K2XBaoyH2cTnocQEu8AOZ60hPbsyukMPLv5/5qr7V1i8PLHdl6Zf87I+xZXFvPCXYjiTFq+YSDQ=="],
+
+    "@types/react": ["@types/react@19.1.13", "", { "dependencies": { "csstype": "^3.0.2" } }, "sha512-hHkbU/eoO3EG5/MZkuFSKmYqPbSVk5byPFa3e7y/8TybHiLMACgI8seVYlicwk7H5K/rI2px9xrQp/C+AUDTiQ=="],
+
+    "bun-types": ["bun-types@1.2.22", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-hwaAu8tct/Zn6Zft4U9BsZcXkYomzpHJX28ofvx7k0Zz2HNz54n1n+tDgxoWFGB4PcFvJXJQloPhaV2eP3Q6EA=="],
+
+    "csstype": ["csstype@3.1.3", "", {}, "sha512-M1uQkMl8rQK/szD0LNhtqxIPLpimGm8sOBwU7lLnCpSbTyY3yeU1Vc7l4KT5zT4s/yOxHH5O7tIuuLOCnLADRw=="],
+
+    "openai": ["openai@5.23.0", "", { "peerDependencies": { "ws": "^8.18.0", "zod": "^3.23.8" }, "optionalPeers": ["ws", "zod"], "bin": { "openai": "bin/cli" } }, "sha512-Cfq155NHzI7VWR67LUNJMIgPZy2oSh7Fld/OKhxq648BiUjELAvcge7g30xJ6vAfwwXf6TVK0KKuN+3nmIJG/A=="],
+
+    "typescript": ["typescript@5.9.2", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A=="],
+
+    "undici-types": ["undici-types@7.12.0", "", {}, "sha512-goOacqME2GYyOZZfb5Lgtu+1IDmAlAEu5xnD3+xTzS10hT0vzpf0SPjkXwAw9Jm+4n/mQGDP3LO8CPbYROeBfQ=="],
+
+    "zod": ["zod@4.1.11", "", {}, "sha512-WPsqwxITS2tzx1bzhIKsEs19ABD5vmCVa4xBo2tq/SrV4RNZtfws1EnCWQXM6yh8bD08a1idvkB5MZSBiZsjwg=="],
+  }
+}
diff --git a/typescript/index.ts b/typescript/index.ts
new file mode 100644
index 00000000..b1b5572c
--- /dev/null
+++ b/typescript/index.ts
@@ -0,0 +1,104 @@
+import z from "zod";
+import type { ChatCompletionCreateParamsNonStreaming } from "openai/resources/chat/completions/completions";
+
+// Zod schemas for validation
+const roleSchema = z.enum(["system", "user", "assistant"]);
+const messageSchema = z.union([
+  z.object({
+    role: roleSchema,
+    content: z.string(),
+  }),
+  z.object({
+    role: z.literal("tool"),
+    content: z.string(),
+    tool_call_id: z.string(),
+  }),
+]);
+
+const functionDefinitionSchema = z
+  .object({
+    name: z.string().regex(/^[a-zA-Z0-9_-]{1,64}$/),
+    description: z.string().optional(),
+    // JSON Schema object; allow arbitrary keys
+    parameters: z.object({}).loose().optional(),
+  })
+  .loose();
+
+const toolSchema = z.object({
+  type: z.literal("function"),
+  function: functionDefinitionSchema,
+});
+
+const metadataSchema = z
+  .object({
+    invocation_id: z.string(),
+    experiment_id: z.string(),
+    rollout_id: z.string(),
+    run_id: z.string(),
+    row_id: z.string(),
+  })
+  .loose();
+
+export const initRequestSchema = z.object({
+  rollout_id: z.string(),
+  model: z.string(),
+  messages: z.array(messageSchema).min(1),
+  tools: z.array(toolSchema).optional().nullable(),
+  metadata: metadataSchema,
+});
+
+export const statusInfoSchema = z.record(z.string(), z.any());
+
+export const statusResponseSchema = z.object({
+  terminated: z.boolean(),
+  info: statusInfoSchema.optional(),
+});
+
+// Infer types from schemas
+export type Message = z.infer<typeof messageSchema>;
+export type FunctionDefinition = z.infer<typeof functionDefinitionSchema>;
+export type Tool = z.infer<typeof toolSchema>;
+export type Metadata = z.infer<typeof metadataSchema>;
+export type InitRequest = z.infer<typeof initRequestSchema>;
+export type StatusInfo = z.infer<typeof statusInfoSchema>;
+export type StatusResponse = z.infer<typeof statusResponseSchema>;
+
+export function initRequestToCompletionParams(
+  initRequest: InitRequest
+): ChatCompletionCreateParamsNonStreaming {
+  const toolsToOpenAI = initRequest.tools?.map((tool) => ({
+    type: "function" as const,
+    function: tool.function.description
+      ? {
+          name: tool.function.name,
+          description: tool.function.description,
+          parameters: tool.function.parameters || {},
+        }
+      : {
+          name: tool.function.name,
+          parameters: tool.function.parameters || {},
+        },
+  }));
+
+  const completionParams = toolsToOpenAI
+    ? {
+        model: initRequest.model,
+        messages: initRequest.messages,
+        tools: toolsToOpenAI,
+      }
+    : {
+        model: initRequest.model,
+        messages: initRequest.messages,
+      };
+  return completionParams;
+}
+
+export function createLangfuseConfigTags(initRequest: InitRequest): string[] {
+  return [
+    `invocation_id:${initRequest.metadata.invocation_id}`,
+    `experiment_id:${initRequest.metadata.experiment_id}`,
+    `rollout_id:${initRequest.metadata.rollout_id}`,
+    `run_id:${initRequest.metadata.run_id}`,
+    `row_id:${initRequest.metadata.row_id}`,
+  ];
+}
diff --git a/typescript/package.json b/typescript/package.json
new file mode 100644
index 00000000..986409e2
--- /dev/null
+++ b/typescript/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "eval-protocol",
+  "module": "index.ts",
+  "type": "module",
+  "version": "0.1.2",
+  "devDependencies": {
+    "@types/bun": "latest",
+    "openai": "^5.23.0"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  },
+  "dependencies": {
+    "zod": "^4.1.11"
+  }
+}
diff --git a/typescript/tsconfig.json b/typescript/tsconfig.json
new file mode 100644
index 00000000..bfa0fead
--- /dev/null
+++ b/typescript/tsconfig.json
@@ -0,0 +1,29 @@
+{
+  "compilerOptions": {
+    // Environment setup & latest features
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "Preserve",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+    "noImplicitOverride": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}

From 941b21eb9e64c4ec848d70954efd01897d9d79b8 Mon Sep 17 00:00:00 2001
From: Derek Xu <xzrderek@gmail.com>
Date: Thu, 25 Sep 2025 15:49:17 -0700
Subject: [PATCH 12/12] move folders

---
 eval_protocol/types/remote_rollout_processor.py    |  1 +
 .../langfuse => remote_server}/remote_server.py    | 14 +-------------
 .../test_remote_langfuse.py}                       |  4 ++--
 .../test_remote_langfuse_typescript.py}            |  1 -
 .../typescript-server/.gitignore                   |  0
 .../typescript-server/README.md                    |  0
 .../typescript-server/env.ts                       |  0
 .../typescript-server/instrumentation.ts           |  2 +-
 .../typescript-server/package.json                 |  0
 .../typescript-server/pnpm-lock.yaml               |  0
 .../typescript-server/server.ts                    |  4 ++--
 .../typescript-server/tsconfig.json                |  0
 12 files changed, 7 insertions(+), 19 deletions(-)
 rename tests/{chinook/langfuse => remote_server}/remote_server.py (77%)
 rename tests/{chinook/langfuse/test_remote_langfuse_chinook.py => remote_server/test_remote_langfuse.py} (95%)
 rename tests/{chinook/langfuse/test_remote_langfuse_chinook_typescript.py => remote_server/test_remote_langfuse_typescript.py} (99%)
 rename tests/{chinook/langfuse => remote_server}/typescript-server/.gitignore (100%)
 rename tests/{chinook/langfuse => remote_server}/typescript-server/README.md (100%)
 rename tests/{chinook/langfuse => remote_server}/typescript-server/env.ts (100%)
 rename tests/{chinook/langfuse => remote_server}/typescript-server/instrumentation.ts (95%)
 rename tests/{chinook/langfuse => remote_server}/typescript-server/package.json (100%)
 rename tests/{chinook/langfuse => remote_server}/typescript-server/pnpm-lock.yaml (100%)
 rename tests/{chinook/langfuse => remote_server}/typescript-server/server.ts (99%)
 rename tests/{chinook/langfuse => remote_server}/typescript-server/tsconfig.json (100%)

diff --git a/eval_protocol/types/remote_rollout_processor.py b/eval_protocol/types/remote_rollout_processor.py
index 405692d1..bdc1f9f2 100644
--- a/eval_protocol/types/remote_rollout_processor.py
+++ b/eval_protocol/types/remote_rollout_processor.py
@@ -31,6 +31,7 @@ class StatusResponse(BaseModel):
     """Response model for GET /status endpoint."""
 
     terminated: bool
+    info: Optional[Dict[str, Any]] = None
 
 
 def create_langfuse_config_tags(init_request: InitRequest) -> List[str]:
diff --git a/tests/chinook/langfuse/remote_server.py b/tests/remote_server/remote_server.py
similarity index 77%
rename from tests/chinook/langfuse/remote_server.py
rename to tests/remote_server/remote_server.py
index 2add76c1..edd7f198 100644
--- a/tests/chinook/langfuse/remote_server.py
+++ b/tests/remote_server/remote_server.py
@@ -19,18 +19,6 @@
 
 _STATE: Dict[str, Dict[str, Any]] = {}
 
-ALLOWED_MESSAGE_FIELDS = {"role", "content", "tool_calls", "tool_call_id", "name"}
-
-
-def _clean_messages_for_api(messages: List[Message]) -> list[dict]:
-    cleaned: list[dict] = []
-    for msg in messages:
-        msg_dict = msg.model_dump()
-        cm = {k: v for k, v in msg_dict.items() if k in ALLOWED_MESSAGE_FIELDS and v is not None}
-        # Some providers dislike empty content on assistant messages; keep if present
-        cleaned.append(cm)
-    return cleaned
-
 
 @app.post("/init")
 def init(req: InitRequest):
@@ -44,7 +32,7 @@ def _worker():
 
             completion_kwargs = {
                 "model": req.model,
-                "messages": _clean_messages_for_api(req.messages),
+                "messages": req.messages,
                 "metadata": metadata,
             }
 
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook.py b/tests/remote_server/test_remote_langfuse.py
similarity index 95%
rename from tests/chinook/langfuse/test_remote_langfuse_chinook.py
rename to tests/remote_server/test_remote_langfuse.py
index cdcd68fb..313908d1 100644
--- a/tests/chinook/langfuse/test_remote_langfuse_chinook.py
+++ b/tests/remote_server/test_remote_langfuse.py
@@ -1,7 +1,7 @@
 # MANUAL SERVER STARTUP REQUIRED:
 # Before running this test, start the remote server manually:
 # cd /Users/derekxu/Documents/code/python-sdk
-# python -m tests.chinook.langfuse.remote_server
+# python -m tests.remote_server.remote_server
 #
 # The server should be running on http://127.0.0.1:7077
 
@@ -64,7 +64,7 @@ def rows() -> List[EvaluationRow]:
 async def test_remote_rollout_and_fetch_langfuse(row: EvaluationRow) -> EvaluationRow:
     """
     End-to-end test:
-    - REQUIRES MANUAL SERVER STARTUP: python -m tests.chinook.langfuse.remote_server
+    - REQUIRES MANUAL SERVER STARTUP: python -m tests.remote_server.remote_server
     - trigger remote rollout via RemoteRolloutProcessor (calls init/status)
     - fetch traces from Langfuse filtered by metadata via output_data_loader; FAIL if none found
     """
diff --git a/tests/chinook/langfuse/test_remote_langfuse_chinook_typescript.py b/tests/remote_server/test_remote_langfuse_typescript.py
similarity index 99%
rename from tests/chinook/langfuse/test_remote_langfuse_chinook_typescript.py
rename to tests/remote_server/test_remote_langfuse_typescript.py
index bb3b7bf5..942a12ad 100644
--- a/tests/chinook/langfuse/test_remote_langfuse_chinook_typescript.py
+++ b/tests/remote_server/test_remote_langfuse_typescript.py
@@ -1,6 +1,5 @@
 import os
 from typing import List
-import atexit
 
 import pytest
 
diff --git a/tests/chinook/langfuse/typescript-server/.gitignore b/tests/remote_server/typescript-server/.gitignore
similarity index 100%
rename from tests/chinook/langfuse/typescript-server/.gitignore
rename to tests/remote_server/typescript-server/.gitignore
diff --git a/tests/chinook/langfuse/typescript-server/README.md b/tests/remote_server/typescript-server/README.md
similarity index 100%
rename from tests/chinook/langfuse/typescript-server/README.md
rename to tests/remote_server/typescript-server/README.md
diff --git a/tests/chinook/langfuse/typescript-server/env.ts b/tests/remote_server/typescript-server/env.ts
similarity index 100%
rename from tests/chinook/langfuse/typescript-server/env.ts
rename to tests/remote_server/typescript-server/env.ts
diff --git a/tests/chinook/langfuse/typescript-server/instrumentation.ts b/tests/remote_server/typescript-server/instrumentation.ts
similarity index 95%
rename from tests/chinook/langfuse/typescript-server/instrumentation.ts
rename to tests/remote_server/typescript-server/instrumentation.ts
index 5918ac32..1992f78a 100644
--- a/tests/chinook/langfuse/typescript-server/instrumentation.ts
+++ b/tests/remote_server/typescript-server/instrumentation.ts
@@ -1,6 +1,6 @@
 import { NodeSDK } from "@opentelemetry/sdk-node";
 import { LangfuseSpanProcessor } from "@langfuse/otel";
-import "./env";
+import "./env.js";
 
 const sdk = new NodeSDK({
   spanProcessors: [
diff --git a/tests/chinook/langfuse/typescript-server/package.json b/tests/remote_server/typescript-server/package.json
similarity index 100%
rename from tests/chinook/langfuse/typescript-server/package.json
rename to tests/remote_server/typescript-server/package.json
diff --git a/tests/chinook/langfuse/typescript-server/pnpm-lock.yaml b/tests/remote_server/typescript-server/pnpm-lock.yaml
similarity index 100%
rename from tests/chinook/langfuse/typescript-server/pnpm-lock.yaml
rename to tests/remote_server/typescript-server/pnpm-lock.yaml
diff --git a/tests/chinook/langfuse/typescript-server/server.ts b/tests/remote_server/typescript-server/server.ts
similarity index 99%
rename from tests/chinook/langfuse/typescript-server/server.ts
rename to tests/remote_server/typescript-server/server.ts
index 0f14f58c..0551e639 100644
--- a/tests/chinook/langfuse/typescript-server/server.ts
+++ b/tests/remote_server/typescript-server/server.ts
@@ -4,8 +4,8 @@ import helmet from "helmet";
 import { z } from "zod";
 import { OpenAI } from "openai";
 import { observeOpenAI } from "@langfuse/openai";
-import "./instrumentation";
-import "./env";
+import "./instrumentation.js";
+import "./env.js";
 import {
   initRequestSchema,
   statusResponseSchema,
diff --git a/tests/chinook/langfuse/typescript-server/tsconfig.json b/tests/remote_server/typescript-server/tsconfig.json
similarity index 100%
rename from tests/chinook/langfuse/typescript-server/tsconfig.json
rename to tests/remote_server/typescript-server/tsconfig.json