From ebdd87fefdb4e5eb4a5020b8a0a95c8bff695349 Mon Sep 17 00:00:00 2001
From: lincyaw <814750204@qq.com>
Date: Fri, 31 Oct 2025 14:47:11 +0800
Subject: [PATCH 1/2] feat: add phoenix tracer

---
 .github/workflows/tests-full.yml |   4 +-
 .github/workflows/tests.yml      |   5 +-
 agentlightning/tracer/phoenix.py | 195 +++++++++++
 pyproject.toml                   |   4 +
 tests/tracer/test_phoenix.py     | 542 +++++++++++++++++++++++++++++++
 uv.lock                          |  72 +++-
 6 files changed, 817 insertions(+), 5 deletions(-)
 create mode 100644 agentlightning/tracer/phoenix.py
 create mode 100644 tests/tracer/test_phoenix.py

diff --git a/.github/workflows/tests-full.yml b/.github/workflows/tests-full.yml
index 5dbd5f4e..11b8f092 100644
--- a/.github/workflows/tests-full.yml
+++ b/.github/workflows/tests-full.yml
@@ -55,10 +55,10 @@ jobs:
         run: uv lock --upgrade
         if: matrix.setup-script == 'latest'
       - name: Sync dependencies (latest)
-        run: uv sync --frozen --no-default-groups --extra apo --group dev --group agents --group torch-gpu-stable
+        run: uv sync --frozen --no-default-groups --extra apo --extra phoenix --group dev --group agents --group torch-gpu-stable
         if: matrix.setup-script == 'latest'
       - name: Sync dependencies (stable & legacy)
-        run: uv sync --frozen --no-default-groups --extra apo --group dev --group agents --group torch-gpu-${{ matrix.setup-script }}
+        run: uv sync --frozen --no-default-groups --extra apo --extra phoenix --group dev --group agents --group torch-gpu-${{ matrix.setup-script }}
         if: matrix.setup-script != 'latest'
       - name: Freeze dependencies
         run: |
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e638275b..7dc39bd5 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -37,6 +37,7 @@ jobs:
           uv sync --frozen \
             --extra apo \
             --extra verl \
+            --extra phoenix \
             --group dev \
             --group torch-cpu \
             --group torch-stable \
@@ -115,10 +116,10 @@ jobs:
         run: uv lock --upgrade
         if: matrix.setup-script == 'latest'
       - name: Sync dependencies (latest)
-        run: uv sync --frozen --no-default-groups --extra apo --group dev --group agents --group core-stable
+        run: uv sync --frozen --no-default-groups --extra apo --extra phoenix --group dev --group agents --group core-stable
         if: matrix.setup-script == 'latest'
       - name: Sync dependencies (stable & legacy)
-        run: uv sync --frozen --no-default-groups --extra apo --group dev --group agents --group core-${{ matrix.setup-script }}
+        run: uv sync --frozen --no-default-groups --extra apo --extra phoenix --group dev --group agents --group core-${{ matrix.setup-script }}
         if: matrix.setup-script != 'latest'
       - name: Freeze dependencies
         run: |
diff --git a/agentlightning/tracer/phoenix.py b/agentlightning/tracer/phoenix.py
new file mode 100644
index 00000000..eea185c2
--- /dev/null
+++ b/agentlightning/tracer/phoenix.py
@@ -0,0 +1,195 @@
+"""Phoenix-backed tracer integration for Agent Lightning.
+
+This tracer bridges Agent Lightning's tracing interface with Arize Phoenix by
+leveraging the ``arize-phoenix-otel`` package. It registers a Phoenix-aware
+``TracerProvider`` for each worker process and reuses the built-in
+``LightningSpanProcessor`` to capture spans so that they can be stored or
+inspected inside Agent Lightning.
+"""
+
+from __future__ import annotations
+
+import inspect
+import logging
+import os
+from collections.abc import AsyncGenerator, Iterator
+from contextlib import asynccontextmanager, contextmanager
+from typing import Any
+
+from agentlightning.store.base import LightningStore
+from agentlightning.tracer.agentops import LightningSpanProcessor
+from agentlightning.tracer.base import Tracer
+from opentelemetry import trace as trace_api
+from opentelemetry.sdk.trace import ReadableSpan, TracerProvider
+from phoenix.otel import register as phoenix_register
+
+logger = logging.getLogger(__name__)
+
+
+class PhoenixTracer(Tracer):
+    """Tracer implementation that sends spans to Arize Phoenix.
+
+    Parameters are primarily thin wrappers around ``phoenix.otel.register``. By
+    default, configuration is read from the standard Phoenix environment
+    variables so that existing deployments keep working without code changes.
+
+    Note: This tracer will set its own global OpenTelemetry TracerProvider.
+    If you have already called ``setup_otel_tracing()`` from this module,
+    there may be conflicts. Choose one approach:
+
+    - For Agent Lightning training: Use PhoenixTracer with Trainer
+    - For general agent tracing: Use setup_otel_tracing()
+    """
+
+    def __init__(
+        self,
+        *,
+        endpoint: str | None = None,
+        project_name: str | None = None,
+        api_key: str | None = None,
+        auto_instrument: bool = True,
+        use_batch_processor: bool = False,
+        headers: dict[str, str] | None = None,
+        register_kwargs: dict[str, Any] | None = None,
+    ) -> None:
+        super().__init__()
+        self.endpoint = endpoint or os.getenv("PHOENIX_ENDPOINT")
+        self.project_name = project_name or os.getenv("PHOENIX_PROJECT_NAME")
+        self.api_key = api_key or os.getenv("PHOENIX_API_KEY")
+        self.auto_instrument = auto_instrument
+        self.use_batch_processor = use_batch_processor
+        self.headers = headers
+        self.register_kwargs = register_kwargs.copy() if register_kwargs else {}
+
+        self._tracer_provider: TracerProvider | None = None
+        self._lightning_span_processor: LightningSpanProcessor | None = None
+        self._initialized = False
+
+    def init(self, *args: Any, **kwargs: Any) -> None:  # noqa: D401 - hook required by interface
+        """Main-process initialization hook (no-op for Phoenix)."""
+        logger.debug("PhoenixTracer main-process init invoked.")
+
+    def teardown(self, *args: Any, **kwargs: Any) -> None:
+        logger.debug("PhoenixTracer main-process teardown invoked.")
+
+    def init_worker(self, worker_id: int, *args: Any, **kwargs: Any) -> None:
+        super().init_worker(worker_id, *args, **kwargs)
+        if self._initialized:
+            logger.warning(
+                "PhoenixTracer already initialized in worker %s; skipping re-registration.",
+                worker_id,
+            )
+            return
+
+        logger.info("[Worker %s] Configuring Phoenix tracer provider...", worker_id)
+
+        register_options: dict[str, Any] = {
+            "endpoint": self.endpoint,
+            "project_name": self.project_name,
+            "headers": self.headers,
+            "batch": self.use_batch_processor,
+            "set_global_tracer_provider": False,  # Don't override existing global provider
+            "auto_instrument": self.auto_instrument,
+        }
+        if self.api_key:
+            register_options["api_key"] = self.api_key
+        register_options.update(self.register_kwargs)
+
+        tracer_provider = phoenix_register(**register_options)
+        self._tracer_provider = tracer_provider
+
+        # Set as global tracer provider (will override if already set)
+        trace_api.set_tracer_provider(tracer_provider)
+        logger.info("[Worker %s] Phoenix tracer provider set as global.", worker_id)
+
+        self._lightning_span_processor = LightningSpanProcessor()
+        span_processor_kwargs: dict[str, Any] = {}
+        parameters = inspect.signature(tracer_provider.add_span_processor).parameters
+        if "replace_default_processor" in parameters:
+            span_processor_kwargs["replace_default_processor"] = False
+        tracer_provider.add_span_processor(
+            self._lightning_span_processor, **span_processor_kwargs
+        )  # type: ignore[misc]
+
+        self._initialized = True
+        logger.info("[Worker %s] Phoenix tracer provider ready.", worker_id)
+
+    def teardown_worker(self, worker_id: int, *args: Any, **kwargs: Any) -> None:
+        super().teardown_worker(worker_id, *args, **kwargs)
+        logger.info("[Worker %s] Tearing down Phoenix tracer provider...", worker_id)
+        if self._lightning_span_processor is not None:
+            self._lightning_span_processor.shutdown()
+            self._lightning_span_processor = None
+        if self._tracer_provider is not None:
+            self._tracer_provider.shutdown()
+            self._tracer_provider = None
+        self._initialized = False
+
+    @asynccontextmanager
+    async def trace_context(
+        self,
+        name: str | None = None,
+        *,
+        store: LightningStore | None = None,
+        rollout_id: str | None = None,
+        attempt_id: str | None = None,
+    ) -> AsyncGenerator[LightningSpanProcessor, None]:
+        if not self._lightning_span_processor:
+            raise RuntimeError(
+                "LightningSpanProcessor is not initialized. Call init_worker() first."
+            )
+
+        with self._trace_context_sync(
+            name=name,
+            store=store,
+            rollout_id=rollout_id,
+            attempt_id=attempt_id,
+        ) as processor:
+            yield processor
+
+    @contextmanager
+    def _trace_context_sync(
+        self,
+        name: str | None = None,
+        *,
+        store: LightningStore | None = None,
+        rollout_id: str | None = None,
+        attempt_id: str | None = None,
+    ) -> Iterator[LightningSpanProcessor]:
+        if not self._lightning_span_processor:
+            raise RuntimeError(
+                "LightningSpanProcessor is not initialized. Call init_worker() first."
+            )
+
+        if store is not None and rollout_id is not None and attempt_id is not None:
+            ctx = self._lightning_span_processor.with_context(
+                store=store, rollout_id=rollout_id, attempt_id=attempt_id
+            )
+            with ctx as processor:
+                yield processor
+        elif store is None and rollout_id is None and attempt_id is None:
+            with self._lightning_span_processor:
+                yield self._lightning_span_processor
+        else:
+            raise ValueError(
+                "store, rollout_id, and attempt_id must be either all provided or all None"
+            )
+
+    def get_last_trace(self) -> list[ReadableSpan]:
+        if not self._lightning_span_processor:
+            raise RuntimeError(
+                "LightningSpanProcessor is not initialized. Call init_worker() first."
+            )
+        return self._lightning_span_processor.spans()
+
+    def get_config(self) -> dict[str, Any]:
+        """Expose current Phoenix configuration for debugging or tests."""
+        return {
+            "endpoint": self.endpoint,
+            "project_name": self.project_name,
+            "api_key": bool(self.api_key),
+            "auto_instrument": self.auto_instrument,
+            "use_batch_processor": self.use_batch_processor,
+            "headers": self.headers,
+            "register_kwargs": self.register_kwargs,
+        }
diff --git a/pyproject.toml b/pyproject.toml
index 0f827f17..7065ee9d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,10 @@ dependencies = [
 apo = [
   "poml",
 ]
+phoenix = [
+  "arize-phoenix-client>=1.14.1", 
+  "arize-phoenix-otel>=0.11.0"
+]
 # It's not recommended to use agentlightning[verl] to install VERL and its dependencies.
 # though it's listed here for completeness.
 verl = [
diff --git a/tests/tracer/test_phoenix.py b/tests/tracer/test_phoenix.py
new file mode 100644
index 00000000..84a9a948
--- /dev/null
+++ b/tests/tracer/test_phoenix.py
@@ -0,0 +1,542 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+# pyright: reportPrivateUsage=false
+
+from __future__ import annotations
+
+import asyncio
+import multiprocessing
+import pickle
+import threading
+import time
+from multiprocessing.connection import Connection
+from typing import Any
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+from opentelemetry.sdk.trace import ReadableSpan
+from opentelemetry.trace import SpanContext, TraceFlags
+
+from agentlightning.reward import (
+    emit_reward,
+    find_reward_spans,
+    get_reward_value,
+    reward,
+)
+from agentlightning.store.base import LightningStore
+from agentlightning.tracer.agentops import LightningSpanProcessor
+from agentlightning.tracer.phoenix import PhoenixTracer
+
+from ..common.tracer import clear_agentops_init, clear_tracer_provider
+
+
+def create_span(
+    name: str, sampled: bool = True, with_context: bool = True
+) -> MagicMock:
+    """Helper to create mock spans with different properties."""
+    span = MagicMock(spec=ReadableSpan)
+    span.name = name
+    if with_context:
+        span.context = SpanContext(
+            trace_id=hash(name) % (2**64),
+            span_id=hash(name) % (2**64),
+            is_remote=False,
+            trace_flags=TraceFlags(0x01 if sampled else 0x00),
+        )
+    else:
+        span.context = None
+    return span
+
+
+def create_mock_store() -> MagicMock:
+    """Helper to create a mock LightningStore."""
+    store = MagicMock(spec=LightningStore)
+    store.add_otel_span = AsyncMock(return_value=None)
+    return store
+
+
+def test_initialization_and_shutdown():
+    """Test processor lifecycle: initialization, loop thread, and shutdown."""
+    processor = LightningSpanProcessor()
+
+    # Verify initialization
+    assert processor._spans == []
+    assert processor._store is None
+    assert processor._rollout_id is None
+    assert processor._attempt_id is None
+
+    # Verify loop thread is running correctly
+    assert processor._loop is not None
+    assert processor._loop.is_running()
+    assert processor._loop_thread.is_alive()
+    assert processor._loop_thread.daemon is True
+    assert processor._loop_thread.name == "otel-loop"
+
+    # Verify shutdown stops everything
+    thread = processor._loop_thread
+    processor.shutdown()
+
+    time.sleep(0.1)  # Give thread time to stop
+    assert not thread.is_alive()
+    assert processor._loop is None
+
+    # Verify double shutdown is safe (idempotent)
+    processor.shutdown()  # Should not raise
+    assert processor._loop is None
+
+
+def test_span_collection_with_filtering():
+    """Test that spans are collected with proper filtering."""
+    processor = LightningSpanProcessor()
+
+    sampled_span = create_span("sampled", sampled=True)
+    unsampled_span = create_span("unsampled", sampled=False)
+    no_context_span = create_span("no_context", with_context=False)
+
+    # Process different types of spans
+    processor.on_end(sampled_span)
+    processor.on_end(unsampled_span)
+    processor.on_end(no_context_span)
+
+    # Only sampled span with context should be collected
+    collected = processor.spans()
+    assert len(collected) == 1
+    assert collected[0] == sampled_span
+
+    processor.shutdown()
+
+
+def test_context_managers_clear_state():
+    """Test that both context managers properly manage state."""
+    processor = LightningSpanProcessor()
+    store = create_mock_store()
+
+    # Add a span first
+    span1 = create_span("span1")
+    processor.on_end(span1)
+    assert len(processor.spans()) == 1
+
+    # Test basic context manager: __enter__ clears spans
+    with processor:
+        assert len(processor.spans()) == 0
+        span2 = create_span("span2")
+        processor.on_end(span2)
+        assert len(processor.spans()) == 1
+
+    # After exit, store context should be cleared
+    assert processor._store is None
+    assert processor._rollout_id is None
+    assert processor._attempt_id is None
+
+    # Test with_context: sets and clears store context
+    with processor.with_context(store=store, rollout_id="r1", attempt_id="a1") as proc:
+        assert proc is processor
+        assert processor._store is store
+        assert processor._rollout_id == "r1"
+        assert processor._attempt_id == "a1"
+
+    # After exit, context should be cleared
+    assert processor._store is None
+    assert processor._rollout_id is None
+    assert processor._attempt_id is None
+
+    processor.shutdown()
+
+
+def test_store_integration_complete():
+    """Test all store integration scenarios: writes, errors, timeout, thread verification."""
+    processor = LightningSpanProcessor()
+    store = create_mock_store()
+
+    # Test 1: Successful store writes
+    with processor.with_context(store=store, rollout_id="r1", attempt_id="a1"):
+        span1 = create_span("span1")
+        span2 = create_span("span2")
+        processor.on_end(span1)
+        processor.on_end(span2)
+
+    # Verify both spans written to store
+    assert store.add_otel_span.call_count == 2
+    assert len(processor.spans()) == 2
+
+    # Verify call arguments
+    calls = store.add_otel_span.call_args_list
+    assert calls[0][0] == ("r1", "a1", span1)
+    assert calls[1][0] == ("r1", "a1", span2)
+
+    # Test 2: Store write errors are caught and don't crash
+    store.add_otel_span.reset_mock()
+    store.add_otel_span.side_effect = RuntimeError("Store failure")
+
+    with processor.with_context(store=store, rollout_id="r2", attempt_id="a2"):
+        span3 = create_span("span3")
+        processor.on_end(span3)  # Should not raise
+
+    # Span still collected despite store error
+    assert len(processor.spans()) == 1
+    store.add_otel_span.side_effect = None
+
+    # Test 3: Verify writes happen in loop thread
+    execution_thread = None
+
+    async def track_thread(*args: Any, **kwargs: Any):
+        nonlocal execution_thread
+        execution_thread = threading.current_thread()
+
+    store.add_otel_span = AsyncMock(side_effect=track_thread)
+
+    with processor.with_context(store=store, rollout_id="r3", attempt_id="a3"):
+        span4 = create_span("span4")
+        processor.on_end(span4)
+
+    assert execution_thread is not None
+    assert execution_thread.name == "otel-loop"
+
+    # Test 4: Unsampled and no-context spans don't trigger store writes
+    store.add_otel_span.reset_mock()
+    store.add_otel_span = AsyncMock()
+
+    with processor.with_context(store=store, rollout_id="r4", attempt_id="a4"):
+        unsampled = create_span("unsampled", sampled=False)
+        no_ctx = create_span("no_ctx", with_context=False)
+        processor.on_end(unsampled)
+        processor.on_end(no_ctx)
+
+    # Store should not be called for filtered spans
+    store.add_otel_span.assert_not_called()
+
+    processor.shutdown()
+
+
+def test_event_loop_operations():
+    """Test _await_in_loop: execution, exceptions, and timeout."""
+    processor = LightningSpanProcessor()
+
+    # Test 1: Successful coroutine execution
+    async def successful_coro():
+        await asyncio.sleep(0.01)
+        return "success"
+
+    result = processor._await_in_loop(successful_coro())
+    assert result == "success"
+
+    # Test 2: Exception propagation
+    async def failing_coro():
+        raise ValueError("Expected error")
+
+    with pytest.raises(ValueError, match="Expected error"):
+        processor._await_in_loop(failing_coro())
+
+    # Test 3: Timeout handling
+    async def slow_coro():
+        await asyncio.sleep(10)
+        return "too_slow"
+
+    with pytest.raises(Exception):  # Should timeout
+        processor._await_in_loop(slow_coro(), timeout=0.1)
+
+    processor.shutdown()
+
+
+def test_concurrent_access():
+    """Test thread-safe concurrent span processing."""
+    processor = LightningSpanProcessor()
+    store = create_mock_store()
+
+    num_threads = 10
+    spans_per_thread = 5
+    barrier = threading.Barrier(num_threads)
+
+    def process_spans(thread_id: int) -> None:
+        barrier.wait()  # Synchronize all threads to start together
+        for i in range(spans_per_thread):
+            span = create_span(f"thread{thread_id}_span{i}")
+            processor.on_end(span)
+
+    with processor.with_context(
+        store=store, rollout_id="concurrent", attempt_id="test"
+    ):
+        threads = [
+            threading.Thread(target=process_spans, args=(i,))
+            for i in range(num_threads)
+        ]
+
+        for t in threads:
+            t.start()
+        for t in threads:
+            t.join()
+
+    # All spans should be collected and written
+    assert len(processor.spans()) == num_threads * spans_per_thread
+    assert store.add_otel_span.call_count == num_threads * spans_per_thread
+
+    processor.shutdown()
+
+
+def test_multiprocessing_behavior():
+    """Test processor behavior across process boundaries."""
+
+    # Test 1: Creating new processor in subprocess works
+    def subprocess_task(result_queue: "multiprocessing.Queue[tuple[str, Any]]") -> None:
+        try:
+            processor = LightningSpanProcessor()
+
+            # Verify processor works in new process
+            assert processor._loop is not None
+            assert processor._loop_thread.is_alive()
+
+            span = create_span("subprocess_span")
+            processor.on_end(span)
+
+            result_queue.put(("success", len(processor.spans())))
+            processor.shutdown()
+        except Exception as e:
+            result_queue.put(("error", str(e)))
+
+    result_queue: multiprocessing.Queue[tuple[str, Any]] = multiprocessing.Queue()
+    process = multiprocessing.Process(target=subprocess_task, args=(result_queue,))
+    process.start()
+    process.join(timeout=5)
+
+    assert not process.is_alive()
+    status, value = result_queue.get(timeout=1)
+    assert status == "success"
+    assert value == 1
+
+    # Test 2: Processor cannot be pickled (threads aren't picklable)
+    processor = LightningSpanProcessor()
+
+    with pytest.raises((TypeError, AttributeError)):
+        pickle.dumps(processor)
+
+    processor.shutdown()
+
+
+def test_edge_cases():
+    """Test edge cases and error conditions."""
+    processor = LightningSpanProcessor()
+
+    # Test 1: force_flush always returns True
+    assert processor.force_flush() is True
+    assert processor.force_flush(timeout_millis=5000) is True
+
+    # Test 2: Calling _await_in_loop after shutdown raises
+    processor.shutdown()
+
+    async def dummy_coro():
+        return "test"
+
+    with pytest.raises(RuntimeError, match="Loop is not initialized"):
+        processor._await_in_loop(dummy_coro())
+
+    # Test 3: Verify shutdown thread join timeout is respected
+    processor2 = LightningSpanProcessor()
+
+    # Mock thread.join to verify timeout parameter
+    original_join = processor2._loop_thread.join
+    join_timeout: float | None = None
+
+    def mock_join(timeout: float | None = None) -> None:
+        nonlocal join_timeout
+        join_timeout = timeout
+        return original_join(timeout=timeout)
+
+    processor2._loop_thread.join = mock_join
+    processor2.shutdown()
+
+    assert join_timeout == 5  # Should pass 5 second timeout
+
+
+def test_store_write_timeout():
+    """Test that slow store writes respect timeout."""
+    processor = LightningSpanProcessor()
+    store = create_mock_store()
+
+    # Create a slow async function that exceeds timeout
+    async def slow_write(*args: Any, **kwargs: Any) -> None:
+        await asyncio.sleep(10)
+
+    store.add_otel_span = AsyncMock(side_effect=slow_write)
+
+    with processor.with_context(store=store, rollout_id="r1", attempt_id="a1"):
+        span = create_span("test_span")
+        # Should not raise - timeout is caught in on_end
+        processor.on_end(span)
+
+    # Span still collected despite timeout
+    # Note: The timeout in on_end is 5.0 seconds, but the error is caught
+    assert len(processor.spans()) == 1
+
+    processor.shutdown()
+
+
+def test_multiple_processors_in_same_process():
+    """Test that multiple processors can coexist in the same process."""
+    processor1 = LightningSpanProcessor()
+    processor2 = LightningSpanProcessor()
+
+    # Both should have independent loops and threads
+    assert processor1._loop is not processor2._loop
+    assert processor1._loop_thread is not processor2._loop_thread
+    assert processor1._loop is not None and processor1._loop.is_running()
+    assert processor2._loop is not None and processor2._loop.is_running()
+
+    # Both should work independently
+    span1 = create_span("p1_span")
+    span2 = create_span("p2_span")
+
+    processor1.on_end(span1)
+    processor2.on_end(span2)
+
+    assert len(processor1.spans()) == 1
+    assert len(processor2.spans()) == 1
+    assert processor1.spans()[0] == span1
+    assert processor2.spans()[0] == span2
+
+    processor1.shutdown()
+    processor2.shutdown()
+
+
+def test_context_manager_reusability():
+    """Test that context managers can be entered and exited multiple times."""
+    processor = LightningSpanProcessor()
+    store = create_mock_store()
+
+    # First usage
+    with processor.with_context(store=store, rollout_id="r1", attempt_id="a1"):
+        span1 = create_span("span1")
+        processor.on_end(span1)
+
+    assert len(processor.spans()) == 1
+    assert processor._store is None
+
+    # Second usage - should work fine
+    with processor.with_context(store=store, rollout_id="r2", attempt_id="a2"):
+        span2 = create_span("span2")
+        processor.on_end(span2)
+
+    # Spans should be cleared from first context, only span2 present
+    assert len(processor.spans()) == 1
+    assert processor.spans()[0].name == "span2"
+    assert processor._store is None
+
+    processor.shutdown()
+
+
+def _otel_reward_subprocess(mode: str, conn: Connection[tuple[str, Any]]) -> None:
+    asyncio.run(_otel_reward_subprocess_async(mode, conn))
+
+
+async def _otel_reward_subprocess_async(
+    mode: str, conn: Connection[tuple[str, Any]]
+) -> None:
+    tracer: PhoenixTracer | None = None
+    try:
+        try:
+            clear_agentops_init()
+        except Exception:
+            # Some environments ship a minimal agentops stub without tracer helpers.
+            pass
+        clear_tracer_provider()
+
+        tracer = PhoenixTracer()
+        tracer.init_worker(0)
+
+        if mode == "decorator":
+            expected_reward = 2.5
+
+            @reward
+            def compute_reward() -> float:
+                return expected_reward
+
+            async with tracer.trace_context(name="reward-decorator"):
+                returned = compute_reward()
+                if returned != expected_reward:
+                    raise AssertionError(
+                        f"Expected reward {expected_reward}, got {returned}"
+                    )
+
+        elif mode == "emit":
+            expected_reward = 4.5
+            async with tracer.trace_context(name="reward-emit"):
+                emit_reward(expected_reward)
+        else:
+            raise ValueError(f"Unsupported mode: {mode}")
+
+        spans = tracer.get_last_trace()
+        total_spans = len(spans)
+        reward_spans = find_reward_spans(spans)
+        if not reward_spans:
+            raise AssertionError("No reward spans captured by OtelTracer.")
+
+        actual_reward = get_reward_value(reward_spans[-1])
+        if actual_reward is None:
+            raise AssertionError(
+                "Captured reward span does not contain a reward value."
+            )
+
+        conn.send(
+            (
+                "success",
+                {
+                    "mode": mode,
+                    "reward": actual_reward,
+                    "expected_reward": expected_reward,
+                    "total_spans": total_spans,
+                    "reward_spans": len(reward_spans),
+                },
+            )
+        )
+    except Exception as exc:  # pragma: no cover - defensive path
+        try:
+            conn.send(("error", repr(exc)))
+        except Exception:
+            pass
+    finally:
+        if tracer is not None:
+            tracer.teardown_worker(0)
+        conn.close()
+
+
+def _run_otel_reward_test(mode: str) -> dict[str, Any]:
+    ctx = multiprocessing.get_context("spawn")
+    parent_conn, child_conn = ctx.Pipe(duplex=False)
+    proc = ctx.Process(target=_otel_reward_subprocess, args=(mode, child_conn))
+    proc.start()
+    proc.join(15.0)
+
+    if proc.is_alive():
+        proc.terminate()
+        proc.join(5)
+        pytest.fail(f"Subprocess for mode {mode!r} hung.")
+
+    try:
+        if not parent_conn.poll(1.0):
+            pytest.fail(f"No result from subprocess for mode {mode!r}: timed out")
+        status, payload = parent_conn.recv()
+    finally:
+        parent_conn.close()
+
+    if status != "success":
+        pytest.fail(f"Subprocess for mode {mode!r} failed: {payload}")
+
+    assert proc.exitcode == 0, (
+        f"Subprocess for mode {mode!r} exited with code {proc.exitcode}"
+    )
+    return payload
+
+
+def test_otel_tracer_captures_reward_from_decorator():
+    payload = _run_otel_reward_test("decorator")
+    assert payload["reward_spans"] == 1
+    assert payload["total_spans"] == 1
+    assert payload["reward"] == pytest.approx(payload["expected_reward"])  # pyright: ignore[reportUnknownMemberType]
+    assert payload["expected_reward"] == pytest.approx(2.5)  # pyright: ignore[reportUnknownMemberType]
+
+
+def test_otel_tracer_captures_reward_from_emit_reward():
+    payload = _run_otel_reward_test("emit")
+    assert payload["reward_spans"] == 1
+    assert payload["total_spans"] == 1
+    assert payload["reward"] == pytest.approx(payload["expected_reward"])  # pyright: ignore[reportUnknownMemberType]
+    assert payload["expected_reward"] == pytest.approx(4.5)  # pyright: ignore[reportUnknownMemberType]
diff --git a/uv.lock b/uv.lock
index 9aa49922..864b9162 100644
--- a/uv.lock
+++ b/uv.lock
@@ -142,6 +142,10 @@ dependencies = [
 apo = [
     { name = "poml", marker = "sys_platform == 'linux' or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-core-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-tinker') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-cu128') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-torch-gpu-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl')" },
 ]
+phoenix = [
+    { name = "arize-phoenix-client", marker = "sys_platform == 'linux' or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-core-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-tinker') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-cu128') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-torch-gpu-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl')" },
+    { name = "arize-phoenix-otel", marker = "sys_platform == 'linux' or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-core-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-tinker') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-cu128') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-torch-gpu-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl')" },
+]
 verl = [
     { name = "verl", marker = "sys_platform == 'linux' or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-core-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-tinker') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-cu128') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-torch-gpu-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl')" },
     { name = "vllm", version = "0.9.2", source = { registry = "https://pypi.org/simple" }, marker = "(sys_platform == 'linux' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (sys_platform != 'linux' and extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (sys_platform != 'linux' and extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-stable') or (sys_platform != 'linux' and extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-trl') or (sys_platform == 'linux' and extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-legacy') or (sys_platform == 'linux' and extra != 'group-14-agentlightning-torch-gpu-stable' and extra == 'group-14-agentlightning-torch-legacy') or (sys_platform == 'linux' and extra != 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-core-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-tinker') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-cu128') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra != 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra != 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra != 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-trl') or (extra != 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra != 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra != 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-core-legacy' and extra != 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-cpu' and extra != 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-cpu' and extra != 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-core-legacy' and extra != 'group-14-agentlightning-torch-gpu-legacy' and extra != 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra != 'group-14-agentlightning-torch-gpu-legacy' and extra != 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl')" },
@@ -323,6 +327,8 @@ trl = [
 requires-dist = [
     { name = "agentops", specifier = ">=0.4.13" },
     { name = "aiohttp" },
+    { name = "arize-phoenix-client", marker = "extra == 'phoenix'", specifier = ">=1.14.1" },
+    { name = "arize-phoenix-otel", marker = "extra == 'phoenix'", specifier = ">=0.11.0" },
     { name = "fastapi" },
     { name = "flask" },
     { name = "graphviz" },
@@ -341,7 +347,7 @@ requires-dist = [
     { name = "verl", marker = "extra == 'verl'", specifier = ">=0.5.0,<0.6.0" },
     { name = "vllm", marker = "extra == 'verl'", specifier = ">=0.8.4,<0.11.0" },
 ]
-provides-extras = ["apo", "verl"]
+provides-extras = ["apo", "verl", "phoenix"]
 
 [package.metadata.requires-dev]
 agents = [
@@ -865,6 +871,43 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d0/ae/9a053dd9229c0fde6b1f1f33f609ccff1ee79ddda364c756a924c6d8563b/APScheduler-3.11.0-py3-none-any.whl", hash = "sha256:fc134ca32e50f5eadcc4938e3a4545ab19131435e851abb40b34d63d5141c6da", size = 64004, upload-time = "2024-11-24T19:39:24.442Z" },
 ]
 
+[[package]]
+name = "arize-phoenix-client"
+version = "1.21.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "httpx", marker = "sys_platform == 'linux' or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-core-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-tinker') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-cu128') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-torch-gpu-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl')" },
+    { name = "openinference-instrumentation", marker = "sys_platform == 'linux' or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-core-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-tinker') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-core-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-core-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-tinker' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-cu128') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-legacy') or (extra == 'group-14-agentlightning-torch-cpu' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-gpu-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-gpu-legacy' and extra == 'group-14-agentlightning-trl') or (extra == 'group-14-agentlightning-torch-gpu-stable' and extra == 'group-14-agentlightning-torch-legacy') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-torch-stable') or (extra == 'group-14-agentlightning-torch-legacy' and extra == 'group-14-agentlightning-trl')" },
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From 8a4491f821f1ee234561ab0b2f5c52beec23e738 Mon Sep 17 00:00:00 2001
From: lincyaw <814750204@qq.com>
Date: Fri, 31 Oct 2025 14:56:01 +0800
Subject: [PATCH 2/2] fix legacy comment

---
 agentlightning/tracer/phoenix.py | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/agentlightning/tracer/phoenix.py b/agentlightning/tracer/phoenix.py
index eea185c2..b411e1c4 100644
--- a/agentlightning/tracer/phoenix.py
+++ b/agentlightning/tracer/phoenix.py
@@ -32,13 +32,6 @@ class PhoenixTracer(Tracer):
     Parameters are primarily thin wrappers around ``phoenix.otel.register``. By
     default, configuration is read from the standard Phoenix environment
     variables so that existing deployments keep working without code changes.
-
-    Note: This tracer will set its own global OpenTelemetry TracerProvider.
-    If you have already called ``setup_otel_tracing()`` from this module,
-    there may be conflicts. Choose one approach:
-
-    - For Agent Lightning training: Use PhoenixTracer with Trainer
-    - For general agent tracing: Use setup_otel_tracing()
     """
 
     def __init__(