diff --git a/tests/instrument/adapters/frameworks/langfuse/__init__.py b/tests/instrument/adapters/frameworks/langfuse/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/instrument/adapters/frameworks/langfuse/test_lifecycle.py b/tests/instrument/adapters/frameworks/langfuse/test_lifecycle.py
new file mode 100644
index 0000000..de8dec7
--- /dev/null
+++ b/tests/instrument/adapters/frameworks/langfuse/test_lifecycle.py
@@ -0,0 +1,245 @@
+"""Tests for Langfuse adapter lifecycle.
+
+Ported as-is from ateam tests/adapters/langfuse/test_lifecycle.py.
+Only import paths were rewritten (stratix.sdk.python.adapters → layerlens.instrument.adapters)
+and the adapter module path adjusted to .frameworks.langfuse. Test bodies, semantics,
+and assertions are preserved verbatim.
+
+Note: The Langfuse adapter is a batch IMPORTER, not a runtime instrumentation adapter.
+These tests focus on lifecycle (with/without config), connect-without-config edge case,
+import/export SyncResult error semantics, SyncState tracking, health_check, get_status,
+and serialize_for_replay (REPLAY surface). They deliberately do NOT assert streaming
+behavior — Langfuse has no streaming entry point, and PR #110 honestly excludes
+STREAMING from its capability declaration.
+"""
+
+from unittest.mock import MagicMock, patch
+
+from layerlens.instrument.adapters._base import (
+    AdapterCapability,
+    AdapterStatus,
+    ReplayableTrace,
+)
+from layerlens.instrument.adapters.frameworks.langfuse.config import (
+    LangfuseConfig,
+    SyncDirection,
+    SyncState,
+)
+from layerlens.instrument.adapters.frameworks.langfuse.lifecycle import LangfuseAdapter
+
+
+class MockStratix:
+    """Mock STRATIX instance for testing."""
+
+    def __init__(self):
+        self.events = []
+
+    def __bool__(self):
+        return True
+
+    def emit(self, event_type: str, payload: dict):
+        self.events.append({"type": event_type, "payload": payload})
+
+    def get_events(self, event_type: str = None):
+        if event_type:
+            return [e for e in self.events if e["type"] == event_type]
+        return self.events
+
+
+class TestLangfuseAdapter:
+    """Tests for LangfuseAdapter lifecycle."""
+
+    def test_adapter_initialization(self):
+        adapter = LangfuseAdapter()
+        assert adapter.FRAMEWORK == "langfuse"
+        assert adapter.VERSION == "0.1.0"
+        assert not adapter.is_connected
+
+    def test_adapter_with_stratix(self):
+        stratix = MockStratix()
+        adapter = LangfuseAdapter(stratix=stratix)
+        assert adapter.has_stratix
+
+    def test_adapter_without_stratix(self):
+        adapter = LangfuseAdapter()
+        assert not adapter.has_stratix
+
+    def test_connect_without_config(self):
+        """Connect without config succeeds — adapter is usable standalone."""
+        adapter = LangfuseAdapter()
+        adapter.connect()
+        assert adapter.is_connected
+        assert adapter.status == AdapterStatus.HEALTHY
+
+    @patch("layerlens.instrument.adapters.frameworks.langfuse.lifecycle.LangfuseAPIClient")
+    def test_connect_with_config(self, MockClient):  # noqa: N803
+        """Connect with config creates API client and checks health."""
+        mock_client = MagicMock()
+        mock_client.health_check.return_value = {"status": "OK"}
+        MockClient.return_value = mock_client
+
+        config = LangfuseConfig(public_key="pk", secret_key="sk")
+        adapter = LangfuseAdapter(config=config)
+        adapter.connect()
+
+        assert adapter.is_connected
+        assert adapter.status == AdapterStatus.HEALTHY
+        mock_client.health_check.assert_called_once()
+
+    @patch("layerlens.instrument.adapters.frameworks.langfuse.lifecycle.LangfuseAPIClient")
+    def test_connect_health_check_fails(self, MockClient):  # noqa: N803
+        """Connect with failed health check sets DEGRADED status."""
+        from layerlens.instrument.adapters.frameworks.langfuse.client import LangfuseAPIError
+
+        mock_client = MagicMock()
+        mock_client.health_check.side_effect = LangfuseAPIError("Connection refused")
+        MockClient.return_value = mock_client
+
+        config = LangfuseConfig(public_key="pk", secret_key="sk")
+        adapter = LangfuseAdapter(config=config)
+        adapter.connect()
+
+        assert adapter.is_connected
+        assert adapter.status == AdapterStatus.DEGRADED
+
+    @patch("layerlens.instrument.adapters.frameworks.langfuse.lifecycle.LangfuseAPIClient")
+    def test_connect_with_config_arg(self, MockClient):  # noqa: N803
+        """Config can be passed to connect() directly."""
+        mock_client = MagicMock()
+        mock_client.health_check.return_value = {"status": "OK"}
+        MockClient.return_value = mock_client
+
+        adapter = LangfuseAdapter()
+        config = LangfuseConfig(public_key="pk", secret_key="sk")
+        adapter.connect(config=config)
+
+        assert adapter.is_connected
+        assert adapter.config is config
+
+    def test_disconnect(self):
+        adapter = LangfuseAdapter()
+        adapter.connect()
+        adapter.disconnect()
+
+        assert not adapter.is_connected
+        assert adapter.status == AdapterStatus.DISCONNECTED
+
+    def test_disconnect_clears_client(self):
+        adapter = LangfuseAdapter()
+        adapter.connect()
+        adapter.disconnect()
+
+        assert adapter._client is None
+        assert adapter._importer is None
+        assert adapter._exporter is None
+        assert adapter._sync is None
+
+    def test_health_check_no_config(self):
+        adapter = LangfuseAdapter()
+        adapter.connect()
+        health = adapter.health_check()
+
+        assert health.status == AdapterStatus.HEALTHY
+        assert health.framework_name == "langfuse"
+        assert "No Langfuse config" in health.message
+
+    @patch("layerlens.instrument.adapters.frameworks.langfuse.lifecycle.LangfuseAPIClient")
+    def test_health_check_connected(self, MockClient):  # noqa: N803
+        mock_client = MagicMock()
+        mock_client.health_check.return_value = {"status": "OK"}
+        MockClient.return_value = mock_client
+
+        config = LangfuseConfig(public_key="pk", secret_key="sk")
+        adapter = LangfuseAdapter(config=config)
+        adapter.connect()
+
+        health = adapter.health_check()
+        assert health.status == AdapterStatus.HEALTHY
+        assert "reachable" in health.message
+
+    def test_get_adapter_info(self):
+        adapter = LangfuseAdapter()
+        info = adapter.get_adapter_info()
+
+        assert info.name == "LangfuseAdapter"
+        assert info.framework == "langfuse"
+        assert AdapterCapability.TRACE_TOOLS in info.capabilities
+        assert AdapterCapability.TRACE_MODELS in info.capabilities
+        assert AdapterCapability.REPLAY in info.capabilities
+        assert "Bidirectional" in info.description
+
+    def test_serialize_for_replay(self):
+        adapter = LangfuseAdapter()
+        trace = adapter.serialize_for_replay()
+
+        assert isinstance(trace, ReplayableTrace)
+        assert trace.adapter_name == "LangfuseAdapter"
+        assert trace.framework == "langfuse"
+        assert trace.trace_id
+
+    def test_serialize_includes_sync_state(self):
+        adapter = LangfuseAdapter()
+        adapter._sync_state.imported_trace_ids.add("t1")
+        adapter._sync_state.exported_trace_ids.add("t2")
+
+        trace = adapter.serialize_for_replay()
+        meta = trace.metadata
+        assert meta["sync_state"]["imported"] == 1
+        assert meta["sync_state"]["exported"] == 1
+
+    def test_get_status(self):
+        adapter = LangfuseAdapter()
+        adapter.connect()
+        status = adapter.get_status()
+
+        assert status["connected"] is True
+        assert status["imported_traces"] == 0
+        assert status["exported_traces"] == 0
+
+    @patch("layerlens.instrument.adapters.frameworks.langfuse.lifecycle.LangfuseAPIClient")
+    def test_get_status_with_config(self, MockClient):  # noqa: N803
+        mock_client = MagicMock()
+        mock_client.health_check.return_value = {"status": "OK"}
+        MockClient.return_value = mock_client
+
+        config = LangfuseConfig(public_key="pk", secret_key="sk", mode="bidirectional")
+        adapter = LangfuseAdapter(config=config)
+        adapter.connect()
+
+        status = adapter.get_status()
+        assert status["host"] == "https://cloud.langfuse.com"
+        assert status["mode"] == "bidirectional"
+        assert status["langfuse_healthy"] is True
+
+    def test_import_without_connection(self):
+        adapter = LangfuseAdapter()
+        adapter.connect()  # No config, so no importer
+        result = adapter.import_traces()
+        assert result.direction == SyncDirection.IMPORT
+        assert len(result.errors) > 0
+
+    def test_export_without_connection(self):
+        adapter = LangfuseAdapter()
+        adapter.connect()
+        result = adapter.export_traces()
+        assert result.direction == SyncDirection.EXPORT
+        assert len(result.errors) > 0
+
+    def test_sync_without_connection(self):
+        adapter = LangfuseAdapter()
+        adapter.connect()
+        result = adapter.sync()
+        assert len(result.errors) > 0
+
+    def test_sync_state_property(self):
+        adapter = LangfuseAdapter()
+        assert isinstance(adapter.sync_state, SyncState)
+
+    def test_config_property(self):
+        config = LangfuseConfig(public_key="pk", secret_key="sk")
+        adapter = LangfuseAdapter(config=config)
+        assert adapter.config is config
+
+    def test_config_property_none(self):
+        adapter = LangfuseAdapter()
+        assert adapter.config is None