diff --git a/internal/cloud/server-workbench-http.ts b/internal/cloud/server-workbench-http.ts
index bf6b53fd..8d7d1c45 100644
--- a/internal/cloud/server-workbench-http.ts
+++ b/internal/cloud/server-workbench-http.ts
@@ -23,6 +23,7 @@ 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_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 = {}) {
@@ -486,7 +487,7 @@ async function queryFactsForSessionSummaries(readModel, sessions = []) {
   const traceIds = uniqueText(sessions.map(factLastTraceId));
   if (sessionIds.length === 0 && traceIds.length === 0) return { facts: emptyFactSet(), count: 0, durable: false, persistence: null };
   const bySessionPromise = sessionIds.length > 0
-    ? readModel.queryFacts({ sessionIds, families: ["messages", "parts", "turns"] })
+    ? readModel.queryFacts({ sessionIds, families: ["messages", "turns"] })
     : Promise.resolve({ facts: emptyFactSet(), count: 0, durable: false, persistence: null });
   const byTracePromise = traceIds.length > 0
     ? readModel.queryFacts({ traceIds, families: ["checkpoints"] })
@@ -1057,7 +1058,7 @@ async function handleWorkbenchSessionDetail(response, options, actor, sessionId)
 
 async function handleWorkbenchMessagePage(response, url, options, actor, sessionId) {
   const readModel = createWorkbenchReadModel(options, actor);
-  const result = await queryFactsByRouteId(readModel, sessionId, { families: WORKBENCH_SESSION_DETAIL_FAMILIES });
+  const result = await queryFactsByRouteId(readModel, sessionId, { families: WORKBENCH_SESSION_MESSAGE_PAGE_FAMILIES });
   if (result.error) return sendJson(response, 503, workbenchProjectionStoreError(result.error));
   const session = visibleFactSessions(result.facts, actor)[0] ?? null;
   if (!session) return sendJson(response, 404, workbenchError("workbench_session_not_found", "Workbench session is not visible to the current actor.", { sessionId }));
@@ -1094,7 +1095,7 @@ async function handleWorkbenchTurnSnapshot(response, url, options, actor, rawTur
     return sendJson(response, 400, body);
   }
   const readModel = createWorkbenchReadModel(options, actor);
-  const result = await readModel.queryFacts({ traceId, limit: MAX_PAGE_LIMIT });
+  const result = await readModel.queryFacts({ traceId, limit: MAX_PAGE_LIMIT, families: WORKBENCH_TRACE_EVENT_METADATA_FAMILIES });
   if (result.error) {
     const body = workbenchProjectionStoreError(result.error);
     recordWorkbenchTurnReadMetric(options, url, 503, body, startedAt);