diff --git a/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue b/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
index 5bc10d15..4ab551e7 100644
--- a/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
+++ b/web/hwlab-cloud-web/src/components/agent/TraceTimeline.vue
@@ -127,7 +127,7 @@ function firstNonEmptyString(...values: unknown[]): string | null {
 </script>
 
 <template>
-  <section v-if="trace" class="trace-timeline" :data-status="trace.status" :data-projection-health="trace.projection?.projectionHealth || trace.projectionHealth || undefined" :data-following="following ? 'true' : 'false'">
+  <section v-if="trace" class="trace-timeline" :data-trace-id="trace.traceId || undefined" :data-status="trace.status" :data-projection-health="trace.projection?.projectionHealth || trace.projectionHealth || undefined" :data-following="following ? 'true' : 'false'">
     <details class="trace-disclosure" :open="expanded" @toggle="onDisclosureToggle">
       <summary class="trace-disclosure-summary" aria-label="折叠运行记录">
         <span class="trace-disclosure-caret" aria-hidden="true" />
@@ -135,7 +135,7 @@ function firstNonEmptyString(...values: unknown[]): string | null {
       </summary>
       <div class="trace-disclosure-body">
         <ol ref="listRef" @scroll="onScroll">
-          <li v-for="(row, index) in readableRows" :key="rowKey(row, index)" class="trace-render-row" :data-event-status="row.tone" :data-terminal="row.terminal ? 'true' : 'false'" :data-row-kind="rowIsTool(row) ? 'tool' : 'message'" :data-row-id="row.rowId">
+          <li v-for="(row, index) in readableRows" :key="rowKey(row, index)" class="trace-render-row" data-testid="trace-render-row" :data-trace-id="trace.traceId || undefined" :data-projected-seq="row.seq ?? undefined" :data-event-kind="row.rowId" :data-event-status="row.tone" :data-terminal="row.terminal ? 'true' : 'false'" :data-row-kind="rowIsTool(row) ? 'tool' : 'message'" :data-row-id="row.rowId" :aria-posinset="row.seq ?? index + 1">
             <details v-if="rowIsTool(row)" class="trace-tool-details">
               <summary>
                 <code>{{ row.header }}</code>