diff --git a/mateclaw-ui/src/components/chat/MessageBubble.vue b/mateclaw-ui/src/components/chat/MessageBubble.vue
index 6933b12c..10b3419e 100644
--- a/mateclaw-ui/src/components/chat/MessageBubble.vue
+++ b/mateclaw-ui/src/components/chat/MessageBubble.vue
@@ -342,8 +342,10 @@ const errorDescription = computed(() => {
   // 优先展示后端 extractUserFriendlyError 生成的具体消息（比泛化模板更有指向性，
   // 比如"当前模型不支持工具调用，请切换到 qwen3 / qwen2.5 ..."）。
   // 仅当 rawMessage 为空/过短时才回退到分类模板。
+  // 阈值用 3：可过滤 "OK"/"fail" 之类无意义短串，又能放行 "无权操作该会话"
+  // 这类 7 字中文 / "Forbidden" 这类英文短消息，避免被泛模板覆盖。
   const raw = errorInfo.value.rawMessage?.trim() || ''
-  if (raw.length > 8) {
+  if (raw.length > 3) {
     // 去掉后端冗余前缀，错误卡标题已经表达了类别
     return raw
       .replace(/^Bad request:\s*/i, '')
diff --git a/mateclaw-ui/src/composables/chat/useChat.ts b/mateclaw-ui/src/composables/chat/useChat.ts
index 358ec752..e3bc44e5 100644
--- a/mateclaw-ui/src/composables/chat/useChat.ts
+++ b/mateclaw-ui/src/composables/chat/useChat.ts
@@ -454,8 +454,14 @@ export function useChat(options: UseChatOptions): UseChatReturn {
   let errorFired = false
   stream.on('error', (data) => {
     if (isStaleEvent(data)) return
+    // Always carry data.message as rawMessage, so the inline error card can
+    // surface the actual reason ("无权操作该会话" etc.) instead of the generic
+    // unknown.description template. classifyBackendError already does this
+    // when errorType is present; the fallback path used to drop it.
     const errorInfo: ChatErrorInfo = data.errorInfo
-      || (data.errorType ? classifyBackendError(data) : { category: 'unknown', retryable: true, timestamp: Date.now() })
+      || (data.errorType
+        ? classifyBackendError(data)
+        : { category: 'unknown', rawMessage: data.message, retryable: true, timestamp: Date.now() })
     if (currentAssistantId.value) {
       const msg = getMessage(currentAssistantId.value)
       if (msg) {
@@ -469,7 +475,8 @@ export function useChat(options: UseChatOptions): UseChatReturn {
       }
       currentAssistantId.value = null
     }
-    error.value = new Error(data.message || '请求失败')
+    const errorMessage = data.message || '请求失败'
+    error.value = new Error(errorMessage)
     streamPhase.value = 'idle'
     phaseInfo.value = null
     // Clear queue on error to avoid stale state
diff --git a/mateclaw-ui/src/views/ChatConsole.vue b/mateclaw-ui/src/views/ChatConsole.vue
index 2438133f..32c96f30 100644
--- a/mateclaw-ui/src/views/ChatConsole.vue
+++ b/mateclaw-ui/src/views/ChatConsole.vue
@@ -565,6 +565,11 @@ const { startObserving: startECharts, dispose: disposeECharts } = useEChartsRend
 const { startObserving: startKatex, dispose: disposeKatex } = useKatexRenderer(echartsContainerRef)
 const { startObserving: startMermaid, dispose: disposeMermaid } = useMermaidRenderer(echartsContainerRef)
 
+// Last-attempt draft, restored into the input box when the SSE error event
+// arrives async (sendChatMessage resolves on connect, the error fires later,
+// so the catch in handleSendMessage cannot recover input by itself).
+const pendingSendDraft = ref<{ input: string; attachments: any[] } | null>(null)
+
 // 使用 useChat composable
 const {
   messages,
@@ -584,11 +589,29 @@ const {
   baseUrl: '',
   thinkingLevel,
   onStreamEnd: async (meta) => {
+    // Restore the input/attachments if the turn ended in an error and the
+    // user hasn't typed something else in the meantime.
+    if (meta.reason === 'error' && pendingSendDraft.value) {
+      const draft = pendingSendDraft.value
+      if (!inputText.value) inputText.value = draft.input
+      if (pendingAttachments.value.length === 0) pendingAttachments.value = draft.attachments
+    }
+    if (meta.reason !== 'error') {
+      pendingSendDraft.value = null
+    }
     // 流结束后刷新会话列表（更新 lastActiveTime / 标题等）
     await loadConversations()
     if (meta.conversationId && meta.conversationId === currentConversationId.value) {
-      // 审批挂起或中断续跑时不从 DB 刷新消息，避免覆盖本地状态或破坏消息顺序
-      if (meta.reason !== 'awaiting_approval' && meta.reason !== 'interrupted') {
+      // Skip DB refresh for awaiting_approval / interrupted / error:
+      //  - awaiting_approval / interrupted: avoids overwriting local-only state
+      //    or breaking message ordering.
+      //  - error: the failed turn (e.g. SSE setup failure like "无权操作该会话")
+      //    was never persisted, so refreshing would wipe the user's just-sent
+      //    bubble and the failed assistant placeholder, leaving no trace of
+      //    the attempt in the chat window.
+      if (meta.reason !== 'awaiting_approval'
+          && meta.reason !== 'interrupted'
+          && meta.reason !== 'error') {
         await refreshCurrentConversationMessages(meta.conversationId)
       }
     }
@@ -736,6 +759,22 @@ function handleKeyboardShortcuts(e: KeyboardEvent) {
 let activityPollTimer: number | null = null
 const ACTIVITY_POLL_MS = 4000
 
+/**
+ * 判断当前消息列表的末尾是不是一条"本地仅有的失败气泡"。
+ * 典型场景：SSE setup 阶段就抛错（如"无权操作该会话"），
+ * 这次 turn 的 user / assistant 消息从未持久化进 DB。
+ * 数据库快照不知道它们存在，pollActivity 的对齐会把它们冲掉。
+ *
+ * 识别条件：末尾 assistant 状态为 failed、带 errorInfo、且 id 不是 DB 数值 id（client uuid）。
+ */
+function hasLocalOnlyFailedTail(): boolean {
+  const last = messages.value[messages.value.length - 1] as any
+  if (!last || last.role !== 'assistant') return false
+  if (last.status !== 'failed') return false
+  if (!last.errorInfo) return false
+  return !/^\d+$/.test(String(last.id))
+}
+
 async function pollActivity() {
   // 页面不可见时不轮询，避免切到别的标签还在空耗
   if (typeof document !== 'undefined' && document.hidden) return
@@ -759,8 +798,11 @@ async function pollActivity() {
         await refreshCurrentConversationMessages(cid)
         if (currentConversationId.value !== cid || isGenerating.value) return
         await reconnectStream(cid)
-      } else {
-        // 不在跑：从 DB 对齐消息（新 user 消息 / 刚落库 assistant 会合并进来）
+      } else if (!hasLocalOnlyFailedTail()) {
+        // 不在跑：从 DB 对齐消息（新 user 消息 / 刚落库 assistant 会合并进来）。
+        // 但若末尾是本地失败气泡（SSE setup 失败一类，后端从未持久化过），
+        // 就跳过对齐 —— 不然这次的 user/失败 assistant 会被 DB 快照覆盖掉，
+        // 用户除了上面的 toast 看不到任何痕迹。
         await refreshCurrentConversationMessages(cid)
       }
     } catch {
@@ -1214,6 +1256,8 @@ async function handleSendMessage(content: string) {
   // 先暂存，发送成功后再清空（失败时恢复）
   const savedInput = inputText.value
   const savedAttachments = [...pendingAttachments.value]
+  // Stash for async-error recovery in onStreamEnd (sync catch can't reach this).
+  pendingSendDraft.value = { input: savedInput, attachments: savedAttachments }
   inputText.value = ''
   chatInputRef.value?.clear?.()
   pendingAttachments.value = []