diff --git a/web/src/components/ToolCallingResult/tools/ListKbsTool.vue b/web/src/components/ToolCallingResult/tools/ListKbsTool.vue
index 72995c08..c6fe59b3 100644
--- a/web/src/components/ToolCallingResult/tools/ListKbsTool.vue
+++ b/web/src/components/ToolCallingResult/tools/ListKbsTool.vue
@@ -3,6 +3,8 @@
     <template #header>
       <div class="sep-header">
         <span class="note">{{ operationLabel }}</span>
+        <span class="separator">|</span>
+        <span class="description">{{ headerSummary }}</span>
       </div>
     </template>
     <template #result="{}">
@@ -50,6 +52,17 @@ const kbList = computed(() => {
   const data = parseData(resultContent)
   return Array.isArray(data) ? data : []
 })
+
+const headerSummary = computed(() => {
+  const names = kbList.value.map((kb) => kb?.name).filter(Boolean)
+  if (!names.length) return '暂无知识库'
+
+  const previewNames = names.slice(0, 3).join('，')
+  const remainingCount = names.length - 3
+  return remainingCount > 0
+    ? `${names.length}个知识库：${previewNames} 等${remainingCount}个`
+    : `${names.length}个知识库：${previewNames}`
+})
 </script>
 
 <style scoped lang="less">
diff --git a/web/src/components/ToolCallingResult/tools/MysqlDescribeTableTool.vue b/web/src/components/ToolCallingResult/tools/MysqlDescribeTableTool.vue
index 6a0b81e0..0d9e8f94 100644
--- a/web/src/components/ToolCallingResult/tools/MysqlDescribeTableTool.vue
+++ b/web/src/components/ToolCallingResult/tools/MysqlDescribeTableTool.vue
@@ -1,5 +1,5 @@
 <template>
-  <BaseToolCall :tool-call="toolCall" :default-expanded="true" :hide-params="true">
+  <BaseToolCall :tool-call="toolCall" :hide-params="true">
     <template #header-success>
       <span class="sep-header">
         <span class="keywords">描述表结构：</span>
diff --git a/web/src/components/ToolCallingResult/tools/MysqlListTablesTool.vue b/web/src/components/ToolCallingResult/tools/MysqlListTablesTool.vue
index 0120f539..fb24f6f0 100644
--- a/web/src/components/ToolCallingResult/tools/MysqlListTablesTool.vue
+++ b/web/src/components/ToolCallingResult/tools/MysqlListTablesTool.vue
@@ -1,5 +1,5 @@
 <template>
-  <BaseToolCall :tool-call="toolCall" :default-expanded="true" :hide-params="true">
+  <BaseToolCall :tool-call="toolCall" :hide-params="true">
     <template #header-success>
       <span class="sep-header">
         <span class="keywords">列出数据库表</span>
diff --git a/web/src/components/ToolCallingResult/tools/MysqlQueryTool.vue b/web/src/components/ToolCallingResult/tools/MysqlQueryTool.vue
index e25513e6..db38833b 100644
--- a/web/src/components/ToolCallingResult/tools/MysqlQueryTool.vue
+++ b/web/src/components/ToolCallingResult/tools/MysqlQueryTool.vue
@@ -1,5 +1,5 @@
 <template>
-  <BaseToolCall :tool-call="toolCall" :default-expanded="true">
+  <BaseToolCall :tool-call="toolCall">
     <template #header-success>
       <span class="sep-header">
         <span class="keywords">执行SQL查询：</span>
diff --git a/web/src/components/sources/KbResultGroupedList.vue b/web/src/components/sources/KbResultGroupedList.vue
index b6290fda..b260e172 100644
--- a/web/src/components/sources/KbResultGroupedList.vue
+++ b/web/src/components/sources/KbResultGroupedList.vue
@@ -12,7 +12,7 @@
           @click="toggleFile(fileGroup.filename)"
         >
           <div class="file-info">
-            <FileText :size="14" />
+            <FileText :size="14" color="var(--gray-600)" />
             <span class="file-name">{{ fileGroup.filename }}</span>
             <span class="chunk-count">{{ fileGroup.chunks.length }} chunks</span>
           </div>
@@ -109,17 +109,11 @@ const fileGroupList = computed(() => {
 watch(
   fileGroupList,
   (groups) => {
-    // 分组变化时清理失效展开项，并默认展开“仅包含一个块”的文件分组。
+    // 分组变化时仅清理失效展开项，默认保持折叠状态。
     const validFilenames = new Set(groups.map((item) => item.filename))
-    const nextExpanded = new Set(
+    expandedFiles.value = new Set(
       [...expandedFiles.value].filter((filename) => validFilenames.has(filename))
     )
-    for (const group of groups) {
-      if (group.chunks.length === 1) {
-        nextExpanded.add(group.filename)
-      }
-    }
-    expandedFiles.value = nextExpanded
   },
   { immediate: true }
 )
@@ -200,7 +194,6 @@ const openChunkDetail = (chunk, index) => {
 
         .file-name {
           font-size: 13px;
-          font-weight: 500;
           color: var(--gray-700);
           flex: 1;
           min-width: 0;