diff --git a/src/agent_engine/engine/langgraph/nodes.py b/src/agent_engine/engine/langgraph/nodes.py
index 1324612..3b56eac 100644
--- a/src/agent_engine/engine/langgraph/nodes.py
+++ b/src/agent_engine/engine/langgraph/nodes.py
@@ -532,7 +532,13 @@ def __init__(
 
     async def __call__(self, state: GraphState) -> dict[str, object]:
         candidates = self._filter_children(state)
-        base_prompt = load_file(self._base_dir, self._spec.prompts.system) or self._spec.description
+        system_content = load_file(self._base_dir, self._spec.prompts.system)
+        orchestrator_content = load_file(self._base_dir, self._spec.prompts.orchestrator)
+        if system_content or orchestrator_content:
+            parts = [p for p in [system_content, orchestrator_content] if p]
+            base_prompt = "\n\n".join(parts)
+        else:
+            base_prompt = self._spec.description
         system_prompt = f"{base_prompt}\n{_ORCHESTRATOR_CONTRACT}"
         return await self._run(system_prompt, candidates, state)