diff --git a/src/uipath/runtime/context.py b/src/uipath/runtime/context.py
index 2fe81a8..f226177 100644
--- a/src/uipath/runtime/context.py
+++ b/src/uipath/runtime/context.py
@@ -37,6 +37,9 @@ 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")
+    synthetic_user_id: str | None = Field(
+        None, description="Conversation owner id (synthetic user) for CAS"
+    )
     voice_mode: Literal["session"] | None = Field(
         None, description="Voice job type for CAS"
     )
@@ -364,6 +367,7 @@ def from_config(
             "conversationalService.conversationId": "conversation_id",
             "conversationalService.exchangeId": "exchange_id",
             "conversationalService.messageId": "message_id",
+            "conversationalService.syntheticUserId": "synthetic_user_id",
             "mcpServer.id": "mcp_server_id",
             "mcpServer.slug": "mcp_server_slug",
             "voice.mode": "voice_mode",
diff --git a/tests/test_context.py b/tests/test_context.py
index 9231f65..41312c0 100644
--- a/tests/test_context.py
+++ b/tests/test_context.py
@@ -183,6 +183,7 @@ def test_from_config_extracts_fps_properties_without_runtime(tmp_path: Path) ->
             "conversationalService.conversationId": "conv-123",
             "conversationalService.exchangeId": "ex-456",
             "conversationalService.messageId": "msg-789",
+            "conversationalService.syntheticUserId": "owner-guid",
             "mcpServer.id": "server-id-123",
             "mcpServer.slug": "my-mcp-server",
         }
@@ -195,6 +196,7 @@ def test_from_config_extracts_fps_properties_without_runtime(tmp_path: Path) ->
     assert ctx.conversation_id == "conv-123"
     assert ctx.exchange_id == "ex-456"
     assert ctx.message_id == "msg-789"
+    assert ctx.synthetic_user_id == "owner-guid"
     assert ctx.mcp_server_id == "server-id-123"
     assert ctx.mcp_server_slug == "my-mcp-server"