diff --git a/backend/src/ea_chatbot/graph/state.py b/backend/src/ea_chatbot/graph/state.py
index 0885782..b7bb191 100644
--- a/backend/src/ea_chatbot/graph/state.py
+++ b/backend/src/ea_chatbot/graph/state.py
@@ -34,3 +34,13 @@ class AgentState(AS):
 
     # Number of execution attempts
     iterations: int
+
+    # --- DeepAgents Extensions ---
+    # High-level plan/checklist: List of Task objects (dicts)
+    checklist: List[Dict[str, Any]]
+    
+    # Current active step in the checklist
+    current_step: int
+    
+    # Virtual File System (VFS): Map of filenames to content/metadata
+    vfs: Dict[str, Any]
diff --git a/backend/tests/test_state_extensions.py b/backend/tests/test_state_extensions.py
new file mode 100644
index 0000000..07eee10
--- /dev/null
+++ b/backend/tests/test_state_extensions.py
@@ -0,0 +1,15 @@
+from typing import get_type_hints, List, Dict, Any
+from ea_chatbot.graph.state import AgentState
+
+def test_agent_state_extensions():
+    """Verify that AgentState has the new DeepAgents fields."""
+    hints = get_type_hints(AgentState)
+    
+    assert "checklist" in hints
+    # checklist: List[Dict[str, Any]] (or similar for tasks)
+    
+    assert "current_step" in hints
+    assert hints["current_step"] == int
+    
+    assert "vfs" in hints
+    # vfs: Dict[str, Any]