fix: update Interrupt object attribute access for LangGraph 1.0+ (#730) (#731)

* Update uv.lock to sync with pyproject.toml

* fix: update Interrupt object attribute access for LangGraph 1.0+ (#730)

The Interrupt class in LangGraph 1.0 no longer has the 'ns' attribute.
This change updates _create_interrupt_event() to use the new 'id'
attribute instead, with a fallback to thread_id for compatibility.

Changes:
- Replace event_data["__interrupt__"][0].ns[0] with interrupt.id
- Use getattr() with fallback for backward compatibility
- Update debug log message from 'ns=' to 'id='
- Add unit tests for _create_interrupt_event function

* fix the unit test error and address review comment

---------

Co-authored-by: Willem Jiang <143703838+willem-bd@users.noreply.github.com>

tests/unit/server/test_app.py

@@ -12,7 +12,12 @@ from langchain_core.messages import AIMessageChunk, ToolMessage
 from langgraph.types import Command
 
 from src.config.report_style import ReportStyle
-from src.server.app import _astream_workflow_generator, _make_event, app
+from src.server.app import (
+    _astream_workflow_generator,
+    _create_interrupt_event,
+    _make_event,
+    app,
+)
 
 
 @pytest.fixture
@@ -657,9 +662,9 @@ class TestAstreamWorkflowGenerator:
     @pytest.mark.asyncio
     @patch("src.server.app.graph")
     async def test_astream_workflow_generator_interrupt_event(self, mock_graph):
-        # Mock interrupt data
+        # Mock interrupt data with the new 'id' attribute (LangGraph 1.0+)
         mock_interrupt = MagicMock()
-        mock_interrupt.ns = ["interrupt_id"]
+        mock_interrupt.id = "interrupt_id"
         mock_interrupt.value = "Plan requires approval"
 
         interrupt_data = {"__interrupt__": [mock_interrupt]}
@@ -920,3 +925,94 @@ class TestGenerateProseEndpoint:
         response = client.post("/api/prose/generate", json=request_data)
         assert response.status_code == 500
         assert response.json()["detail"] == "Internal Server Error"
+
+
+class TestCreateInterruptEvent:
+    """Tests for _create_interrupt_event function (Issue #730 fix)."""
+
+    def test_create_interrupt_event_with_id_attribute(self):
+        """Test that _create_interrupt_event works with LangGraph 1.0+ Interrupt objects that have 'id' attribute."""
+        # Create a mock Interrupt object with the new 'id' attribute (LangGraph 1.0+)
+        mock_interrupt = MagicMock()
+        mock_interrupt.id = "interrupt-123"
+        mock_interrupt.value = "Please review the research plan"
+
+        event_data = {"__interrupt__": [mock_interrupt]}
+        thread_id = "thread-456"
+
+        result = _create_interrupt_event(thread_id, event_data)
+
+        # Verify the result is a properly formatted SSE event
+        assert "event: interrupt\n" in result
+        assert '"thread_id": "thread-456"' in result
+        assert '"id": "interrupt-123"' in result
+        assert '"content": "Please review the research plan"' in result
+        assert '"finish_reason": "interrupt"' in result
+        assert '"role": "assistant"' in result
+
+    def test_create_interrupt_event_fallback_to_thread_id(self):
+        """Test that _create_interrupt_event falls back to thread_id when 'id' attribute is None."""
+        # Create a mock Interrupt object where id is None
+        mock_interrupt = MagicMock()
+        mock_interrupt.id = None
+        mock_interrupt.value = "Plan review needed"
+
+        event_data = {"__interrupt__": [mock_interrupt]}
+        thread_id = "thread-789"
+
+        result = _create_interrupt_event(thread_id, event_data)
+
+        # Verify it falls back to thread_id
+        assert '"id": "thread-789"' in result
+        assert '"thread_id": "thread-789"' in result
+        assert '"content": "Plan review needed"' in result
+
+    def test_create_interrupt_event_without_id_attribute(self):
+        """Test that _create_interrupt_event handles objects without 'id' attribute (backward compatibility)."""
+        # Create a mock object that doesn't have 'id' attribute at all
+        class MockInterrupt:
+            pass
+        mock_interrupt = MockInterrupt()
+        mock_interrupt.value = "Waiting for approval"
+
+        event_data = {"__interrupt__": [mock_interrupt]}
+        thread_id = "thread-abc"
+
+        result = _create_interrupt_event(thread_id, event_data)
+
+        # Verify it falls back to thread_id when id attribute doesn't exist
+        assert '"id": "thread-abc"' in result
+        assert '"content": "Waiting for approval"' in result
+
+    def test_create_interrupt_event_options(self):
+        """Test that _create_interrupt_event includes correct options."""
+        mock_interrupt = MagicMock()
+        mock_interrupt.id = "int-001"
+        mock_interrupt.value = "Review plan"
+
+        event_data = {"__interrupt__": [mock_interrupt]}
+        thread_id = "thread-xyz"
+
+        result = _create_interrupt_event(thread_id, event_data)
+
+        # Verify options are included
+        assert '"options":' in result
+        assert '"text": "Edit plan"' in result
+        assert '"value": "edit_plan"' in result
+        assert '"text": "Start research"' in result
+        assert '"value": "accepted"' in result
+
+    def test_create_interrupt_event_with_complex_value(self):
+        """Test that _create_interrupt_event handles complex content values."""
+        mock_interrupt = MagicMock()
+        mock_interrupt.id = "int-complex"
+        mock_interrupt.value = {"plan": "Research AI", "steps": ["step1", "step2"]}
+
+        event_data = {"__interrupt__": [mock_interrupt]}
+        thread_id = "thread-complex"
+
+        result = _create_interrupt_event(thread_id, event_data)
+
+        # Verify complex value is included (will be serialized as JSON)
+        assert '"id": "int-complex"' in result
+        assert "Research AI" in result or "plan" in result