diff --git a/src/uipath/runtime/context.py b/src/uipath/runtime/context.py
index c77ceb0..4dad0ed 100644
--- a/src/uipath/runtime/context.py
+++ b/src/uipath/runtime/context.py
@@ -37,8 +37,13 @@ class UiPathRuntimeContext(BaseModel):
     )
     exchange_id: str | None = Field(None, description="Exchange identifier for CAS")
     message_id: str | None = Field(None, description="Message identifier for CAS")
-    voice_mode: Literal["config", "toolCall"] | None = Field(
-        None, description="Voice job type for CAS"
+    voice_mode: Literal["session"] | None = Field(
+        None,
+        description=(
+            "Set when this job hosts a voice agent session. "
+            "Only 'session' is supported; the runtime factory uses its presence "
+            "to dispatch to the voice runtime."
+        ),
     )
     mcp_server_id: str | None = None
     mcp_server_slug: str | None = None