diff --git a/internal/cloud/server-workbench-http.ts b/internal/cloud/server-workbench-http.ts
index 680a38e7..b9b4b3eb 100644
--- a/internal/cloud/server-workbench-http.ts
+++ b/internal/cloud/server-workbench-http.ts
@@ -24,7 +24,7 @@ const MAX_PAGE_LIMIT = 100;
 const DEFAULT_WORKBENCH_SSE_HEARTBEAT_MS = 15000;
 const WORKBENCH_SESSION_LIST_PAGE_FAMILIES = Object.freeze(["sessions"]);
 const WORKBENCH_SESSION_DETAIL_FAMILIES = Object.freeze(["sessions", "messages", "parts", "turns", "checkpoints"]);
-const WORKBENCH_SESSION_MESSAGE_PAGE_FAMILIES = Object.freeze(["sessions", "messages", "parts"]);
+const WORKBENCH_SESSION_MESSAGE_PAGE_FAMILIES = Object.freeze(["sessions", "messages", "parts", "turns", "checkpoints"]);
 const WORKBENCH_TRACE_EVENT_METADATA_FAMILIES = Object.freeze(["sessions", "messages", "turns", "checkpoints"]);
 const WORKBENCH_TRACE_EVENT_PAGE_FAMILIES = Object.freeze(["traceEvents"]);
 export async function handleWorkbenchReadModelHttp(request, response, url, options = {}) {