diff --git a/trustgraph-base/trustgraph/schema/services/agent.py b/trustgraph-base/trustgraph/schema/services/agent.py
index a6168eed..ac9562f2 100644
--- a/trustgraph-base/trustgraph/schema/services/agent.py
+++ b/trustgraph-base/trustgraph/schema/services/agent.py
@@ -20,7 +20,7 @@ class AgentStep:
 class AgentRequest:
     question: str = ""
     state: str = ""
-    group: list[str] = field(default_factory=list)
+    group: list[str] | None = None
     history: list['AgentStep'] = field(default_factory=list)
     user: str = ""              # User context for multi-tenancy
     streaming: bool = False     # NEW: Enable streaming response delivery (default false)