diff --git a/src/bus/message.rs b/src/bus/message.rs
index bfadaab..c674f0b 100644
--- a/src/bus/message.rs
+++ b/src/bus/message.rs
@@ -585,6 +585,9 @@ impl OutboundMessage {
                         outbound.push(resp);
                     }
 
+                    // AssistantResponse 已携带 reasoning 时，ToolCall 不再重复；
+                    // 只有 AssistantResponse 没发时，ToolCall 才带 reasoning
+                    let tc_reasoning = if has_content_or_reasoning { None } else { message.reasoning_content.clone() };
                     outbound.extend(tool_calls.iter().map(|tool_call| {
                         let mut tc = Self::tool_call(
                             channel.to_string(),
@@ -596,7 +599,7 @@ impl OutboundMessage {
                             reply_to.clone(),
                             metadata.clone(),
                         );
-                        tc.reasoning_content = message.reasoning_content.clone();
+                        tc.reasoning_content = tc_reasoning.clone();
                         tc
                     }));
                     outbound
diff --git a/src/gateway/default_agent_prompt.md b/src/gateway/default_agent_prompt.md
index 4b92a47..c0dbdf8 100644
--- a/src/gateway/default_agent_prompt.md
+++ b/src/gateway/default_agent_prompt.md
@@ -102,6 +102,7 @@
 - 回答应以帮助用户完成当前目标为中心。
 - 在信息不足时先补关键前提，在信息充分时直接执行。
 - Skill 不是工具名。看到可用 Skill 时，不能直接调用 Skill 名称；必须先调用 skill_activate，并传入对应的 name。
+- 调用工具的时候必须同时用简短的话告诉用户你调用工具是做什么
 
 
 ## 定时任务
@@ -109,5 +110,3 @@
 - 默认创建静默任务（silent_agent_task），在独立后台会话中执行，不干扰主对话
 - 静默模式下如需发送消息给用户，prompt中需显式使用 send_session_message 工具
 
-## 注意
-- 不要通过一次调用写入一个很长的文件，请分段写入
diff --git a/src/protocol/ws_adapter.rs b/src/protocol/ws_adapter.rs
index 42c0080..c581420 100644
--- a/src/protocol/ws_adapter.rs
+++ b/src/protocol/ws_adapter.rs
@@ -29,6 +29,8 @@ pub(crate) fn ws_outbound_from_chat_message(message: &ChatMessage) -> Vec<WsOutb
                     });
                 }
 
+                // AssistantResponse 已携带 reasoning 时，ToolCall 不再重复
+                let tc_reasoning = if has_content_or_reasoning { None } else { message.reasoning_content.clone() };
                 outbound.extend(tool_calls.iter().map(|tool_call| WsOutbound::ToolCall {
                     id: message.id.clone(),
                     tool_call_id: tool_call.id.clone(),
@@ -39,7 +41,7 @@ pub(crate) fn ws_outbound_from_chat_message(message: &ChatMessage) -> Vec<WsOutb
                     subagent_task_id: None,
                     topic_id: None,
                     timestamp: None,
-                    reasoning_content: message.reasoning_content.clone(),
+                    reasoning_content: tc_reasoning.clone(),
                 }));
                 outbound
             } else {
diff --git a/web/src/App.tsx b/web/src/App.tsx
index c4e0795..790beaf 100644
--- a/web/src/App.tsx
+++ b/web/src/App.tsx
@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
-import { Zap, ArrowLeft, Bot, Clock, Sun, Moon, PanelRightOpen, X } from 'lucide-react'
+import { Zap, ArrowLeft, Bot, Clock, Sun, Moon, PanelRightOpen, X, Brain } from 'lucide-react'
 import { ChatContainer } from './components/Chat/ChatContainer'
 import { TopicList } from './components/Sidebar/TopicList'
 import { SchedulerJobList } from './components/Sidebar/SchedulerJobList'
@@ -120,6 +120,14 @@ function App() {
     return () => clearTimeout(timer)
   }, [theme])
 
+  const [showThinking, setShowThinking] = useState(() => {
+    return localStorage.getItem('picobot-show-thinking') !== 'false'
+  })
+
+  useEffect(() => {
+    localStorage.setItem('picobot-show-thinking', String(showThinking))
+  }, [showThinking])
+
   // ---- WebSocket 初始化 ----
 
   // Step 1: 连接建立后先请求通道列表
@@ -443,6 +451,18 @@ function App() {
           >
             {theme === 'dark' ? <Sun className="h-4 w-4" /> : <Moon className="h-4 w-4" />}
           </button>
+          <button
+            onClick={() => setShowThinking(prev => !prev)}
+            className={`flex h-8 w-8 items-center justify-center rounded-lg transition-all ${
+              showThinking
+                ? 'text-purple-400 hover:text-purple-300 bg-purple-500/10 hover:bg-purple-500/20'
+                : 'text-[var(--text-muted)] hover:text-[var(--text-secondary)] hover:bg-[var(--overlay-hover)]'
+            }`}
+            title={showThinking ? '隐藏思考过程' : '显示思考过程'}
+            aria-label="Toggle thinking display"
+          >
+            <Brain className="h-4 w-4" />
+          </button>
         </div>
         <div className="flex items-center gap-4 text-sm text-[var(--text-secondary)]">
           <ChannelSelector
@@ -589,6 +609,7 @@ function App() {
               onSendMessage={subAgentView || schedulerView ? () => {} : handleSendMessage}
               onNavigateToSubAgent={handleNavigateToSubAgent}
               onStop={handleStopExecution}
+              showThinking={showThinking}
             />
           </div>
         </div>
diff --git a/web/src/components/Chat/ChatContainer.tsx b/web/src/components/Chat/ChatContainer.tsx
index c3602dd..b6cf5dd 100644
--- a/web/src/components/Chat/ChatContainer.tsx
+++ b/web/src/components/Chat/ChatContainer.tsx
@@ -10,6 +10,7 @@ interface ChatContainerProps {
   onSendMessage: (content: string, attachments: Attachment[]) => void
   onNavigateToSubAgent?: (taskId: string, description: string) => void
   onStop?: () => void
+  showThinking?: boolean
 }
 
 export function ChatContainer({
@@ -20,11 +21,12 @@ export function ChatContainer({
   onSendMessage,
   onNavigateToSubAgent,
   onStop,
+  showThinking = true,
 }: ChatContainerProps) {
   return (
     <div className="flex h-full flex-col">
       <div className="flex-1 overflow-hidden">
-        <MessageList messages={messages} onNavigateToSubAgent={onNavigateToSubAgent} />
+        <MessageList messages={messages} onNavigateToSubAgent={onNavigateToSubAgent} showThinking={showThinking} />
       </div>
       <MessageInput
         onSend={onSendMessage}
diff --git a/web/src/components/Chat/MessageBubble.tsx b/web/src/components/Chat/MessageBubble.tsx
index 68e11a8..374fc69 100644
--- a/web/src/components/Chat/MessageBubble.tsx
+++ b/web/src/components/Chat/MessageBubble.tsx
@@ -58,6 +58,7 @@ function StatusIcon({ status, size = 14 }: { status: 'calling' | 'result' | 'pen
 interface MessageBubbleProps {
   message: ChatMessage
   onNavigateToSubAgent?: (taskId: string, description: string) => void
+  showThinking?: boolean
 }
 
 function getAttachmentIcon(mediaType: string) {
@@ -240,13 +241,13 @@ function ThinkingSection({ content }: { content: string }) {
   const [expanded, setExpanded] = useState(false)
 
   return (
-    <div className="mb-3 rounded-lg border border-purple-500/20 bg-purple-500/5 overflow-hidden">
+    <div className="mb-3 rounded-lg border border-[var(--border-color)] bg-[var(--overlay-hover)] overflow-hidden">
       <button
         onClick={(e) => { e.stopPropagation(); setExpanded(!expanded) }}
-        className="flex items-center gap-2 w-full px-3 py-2 text-xs text-[var(--text-muted)] hover:text-[var(--text-secondary)] hover:bg-purple-500/5 transition-colors cursor-pointer select-none"
+        className="flex items-center gap-2 w-full px-3 py-2 text-xs text-[var(--text-muted)] hover:text-[var(--text-secondary)] hover:bg-[var(--overlay-subtle)] transition-colors cursor-pointer select-none"
       >
-        <Brain className="h-3.5 w-3.5 text-purple-400 flex-shrink-0" />
-        <span className="font-medium text-purple-300">Thinking</span>
+        <Brain className="h-3.5 w-3.5 text-[var(--accent-purple)] flex-shrink-0" />
+        <span className="font-medium text-[var(--accent-purple)]">Thinking</span>
         {expanded ? (
           <ChevronDown className="h-3 w-3 ml-auto flex-shrink-0" />
         ) : (
@@ -259,8 +260,8 @@ function ThinkingSection({ content }: { content: string }) {
         )}
       </button>
       {expanded && (
-        <div className="px-3 py-2 border-t border-purple-500/10 animate-thinking-reveal">
-          <div className="text-xs text-purple-200/80 whitespace-pre-wrap leading-relaxed max-h-64 overflow-y-auto scrollbar-thin">
+        <div className="px-3 py-2 border-t border-[var(--border-color)] animate-thinking-reveal">
+          <div className="text-xs text-[var(--text-secondary)] whitespace-pre-wrap leading-relaxed max-h-64 overflow-y-auto scrollbar-thin">
             {content}
           </div>
         </div>
@@ -288,7 +289,7 @@ function parseTaskResult(content: string): TaskToolResult | null {
   }
 }
 
-export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubbleProps) {
+export function MessageBubble({ message, onNavigateToSubAgent, showThinking = true }: MessageBubbleProps) {
   const isUser = message.role === 'user'
   const isTool = message.role === 'tool'
   const isMergedTool = message.type === 'merged_tool'
@@ -438,7 +439,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
             </div>
 
             {/* 模型思考内容（工具调用时展示） */}
-            {message.reasoningContent && !toolExpanded && (
+            {showThinking && message.reasoningContent && !toolExpanded && (
               <div className="px-3 pb-1">
                 <ThinkingSection content={message.reasoningContent} />
               </div>
@@ -502,7 +503,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
             {toolExpanded && (
               <div className="border-t border-[var(--border-color)] px-3 py-2 space-y-2">
                 {/* 模型思考内容（展开时也展示） */}
-                {message.reasoningContent && (
+                {showThinking && message.reasoningContent && (
                   <ThinkingSection content={message.reasoningContent} />
                 )}
                 {taskResult ? (
@@ -653,7 +654,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
           ) : (
             // 模型思考内容（仅助手消息，非工具消息）
             <>
-            {!isTool && message.reasoningContent && (
+            {showThinking && !isTool && message.reasoningContent && (
               <ThinkingSection content={message.reasoningContent} />
             )}
             {/* AI 和工具消息使用 Markdown 渲染 */}
diff --git a/web/src/components/Chat/MessageList.tsx b/web/src/components/Chat/MessageList.tsx
index 0e9a2b9..bc81fac 100644
--- a/web/src/components/Chat/MessageList.tsx
+++ b/web/src/components/Chat/MessageList.tsx
@@ -6,9 +6,10 @@ import { Sparkles, ArrowDown, ArrowUp } from 'lucide-react'
 interface MessageListProps {
   messages: ChatMessage[]
   onNavigateToSubAgent?: (taskId: string, description: string) => void
+  showThinking?: boolean
 }
 
-export function MessageList({ messages, onNavigateToSubAgent }: MessageListProps) {
+export function MessageList({ messages, onNavigateToSubAgent, showThinking = true }: MessageListProps) {
   const bottomRef = useRef<HTMLDivElement>(null)
   const containerRef = useRef<HTMLDivElement>(null)
   const isAtBottomRef = useRef(true)
@@ -116,7 +117,7 @@ export function MessageList({ messages, onNavigateToSubAgent }: MessageListProps
         className="h-full overflow-y-auto p-6 space-y-6"
       >
         {messages.map((message) => (
-          <MessageBubble key={message.id} message={message} onNavigateToSubAgent={onNavigateToSubAgent} />
+          <MessageBubble key={message.id} message={message} onNavigateToSubAgent={onNavigateToSubAgent} showThinking={showThinking} />
         ))}
         <div ref={bottomRef} />
       </div>