diff --git a/README.md b/README.md
index df0b6d5..1288ecd 100644
--- a/README.md
+++ b/README.md
@@ -29,13 +29,13 @@ db_host: localhost
 db_port: 3306
 db_user: root
 db_password: ""
-db_name: glm_chat
+db_name: nano_claw
 ```
 
 ### 3. 初始化数据库
 
 ```bash
-mysql -u root -p -e "CREATE DATABASE glm_chat CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"
+mysql -u root -p -e "CREATE DATABASE nano_claw CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"
 
 ```
 
diff --git a/backend/models.py b/backend/models.py
index 0454439..3186f40 100644
--- a/backend/models.py
+++ b/backend/models.py
@@ -1,4 +1,5 @@
 from datetime import datetime, timezone
+from sqlalchemy.dialects.mysql import LONGTEXT
 from . import db
 
 
@@ -45,7 +46,7 @@ class Message(db.Model):
     thinking_content = db.Column(db.Text, default="")
     
     # Tool call support
-    tool_calls = db.Column(db.Text)  # JSON string: tool call requests (assistant messages)
+    tool_calls = db.Column(LONGTEXT)  # JSON string: tool call requests (assistant messages)
     tool_call_id = db.Column(db.String(64))  # Tool call ID (tool messages)
     name = db.Column(db.String(64))  # Tool name (tool messages)
     
diff --git a/docs/Design.md b/docs/Design.md
index 605d4ea..9e41208 100644
--- a/docs/Design.md
+++ b/docs/Design.md
@@ -349,7 +349,13 @@ GET /api/models
 ```json
 {
   "code": 0,
-  "data": ["glm-5", "glm-4", "glm-3-turbo"]
+  "data": [
+    {"id": "glm-5", "name": "GLM-5"},
+    {"id": "glm-5-turbo", "name": "GLM-5 Turbo"},
+    {"id": "glm-4.5", "name": "GLM-4.5"},
+    {"id": "glm-4.6", "name": "GLM-4.6"},
+    {"id": "glm-4.7", "name": "GLM-4.7"}
+  ]
 }
 ```
 
diff --git a/docs/ToolSystemDesign.md b/docs/ToolSystemDesign.md
index f6d66f9..3357a53 100644
--- a/docs/ToolSystemDesign.md
+++ b/docs/ToolSystemDesign.md
@@ -361,7 +361,7 @@ classDiagram
 class SearchService:
     """搜索服务"""
     def __init__(self, engine=None):
-        from duckduckgo_search import DDGS
+        from ddgs import DDGS
         self.engine = engine or DDGS()
 
     def search(self, query: str, max_results: int = 5) -> list:
@@ -431,7 +431,7 @@ from .factory import tool
 def init_tools():
     """初始化所有内置工具"""
     # 导入即自动注册
-    from .builtin import crawler, data, file_ops
+    from .builtin import crawler, data, weather
 
 # 使用时
 init_tools()
@@ -446,10 +446,10 @@ init_tools()
 | crawler | `web_search`    | 网页搜索 | SearchService |
 | crawler | `fetch_page`    | 单页抓取 | FetchService  |
 | crawler | `crawl_batch`   | 批量爬取 | FetchService  |
-| data    | `calculator`    | 数学计算 | -             |
-| data    | `data_analysis` | 数据分析 | -             |
-| file    | `file_reader`   | 文件读取 | -             |
-| file    | `file_writer`   | 文件写入 | -             |
+| data    | `calculator`    | 数学计算 | CalculatorService |
+| data    | `text_process`  | 文本处理 | -             |
+| data    | `json_process`  | JSON处理 | -             |
+| weather | `get_weather`   | 天气查询 | - (模拟数据)      |
 
 ---
 
diff --git a/frontend/src/api/index.js b/frontend/src/api/index.js
index 9a6da0d..5b78353 100644
--- a/frontend/src/api/index.js
+++ b/frontend/src/api/index.js
@@ -1,5 +1,8 @@
 const BASE = '/api'
 
+// Cache for models list
+let modelsCache = null
+
 async function request(url, options = {}) {
   const res = await fetch(`${BASE}${url}`, {
     headers: { 'Content-Type': 'application/json' },
@@ -17,6 +20,34 @@ export const modelApi = {
   list() {
     return request('/models')
   },
+
+  // Get cached models or fetch from server
+  async getCached() {
+    if (modelsCache) {
+      return { data: modelsCache }
+    }
+
+    // Try localStorage cache first
+    const cached = localStorage.getItem('models_cache')
+    if (cached) {
+      try {
+        modelsCache = JSON.parse(cached)
+        return { data: modelsCache }
+      } catch (_) {}
+    }
+
+    // Fetch from server
+    const res = await this.list()
+    modelsCache = res.data
+    localStorage.setItem('models_cache', JSON.stringify(modelsCache))
+    return res
+  },
+
+  // Clear cache (e.g., when models changed on server)
+  clearCache() {
+    modelsCache = null
+    localStorage.removeItem('models_cache')
+  }
 }
 
 export const statsApi = {
diff --git a/frontend/src/components/ChatView.vue b/frontend/src/components/ChatView.vue
index 02b63ae..5d28087 100644
--- a/frontend/src/components/ChatView.vue
+++ b/frontend/src/components/ChatView.vue
@@ -290,7 +290,8 @@ defineExpose({ scrollToBottom })
 .message-bubble {
   display: flex;
   gap: 12px;
-  padding: 16px 0;
+  padding: 0;
+  margin-bottom: 16px;
 }
 
 .message-bubble .avatar {
@@ -312,6 +313,11 @@ defineExpose({ scrollToBottom })
   flex: 1;
   min-width: 0;
   overflow: hidden;
+  padding: 16px;
+  border: 1px solid var(--border-light);
+  border-radius: 12px;
+  background: var(--bg-primary);
+  transition: background 0.2s, border-color 0.2s;
 }
 
 .streaming-content {
diff --git a/frontend/src/components/MessageBubble.vue b/frontend/src/components/MessageBubble.vue
index 5775b27..816b802 100644
--- a/frontend/src/components/MessageBubble.vue
+++ b/frontend/src/components/MessageBubble.vue
@@ -70,7 +70,8 @@ function copyContent() {
 .message-bubble {
   display: flex;
   gap: 12px;
-  padding: 16px 0;
+  padding: 0;
+  margin-bottom: 16px;
 }
 
 .message-bubble.user {
@@ -108,6 +109,11 @@ function copyContent() {
 .message-body {
   flex: 1;
   min-width: 0;
+  padding: 16px;
+  border: 1px solid var(--border-light);
+  border-radius: 12px;
+  background: var(--bg-primary);
+  transition: background 0.2s, border-color 0.2s;
 }
 
 .message-content {
diff --git a/frontend/src/components/SettingsPanel.vue b/frontend/src/components/SettingsPanel.vue
index 9fe1cef..6b6dcfc 100644
--- a/frontend/src/components/SettingsPanel.vue
+++ b/frontend/src/components/SettingsPanel.vue
@@ -97,11 +97,6 @@
           </div>
         </div>
 
-        <div class="settings-footer">
-          <button class="btn-cancel" @click="$emit('close')">取消</button>
-          <button class="btn-save" @click="save">保存</button>
-        </div>
-
         <div class="settings-stats">
           <StatsPanel />
         </div>
@@ -112,7 +107,7 @@
 
 <script setup>
 import { reactive, ref, watch, onMounted } from 'vue'
-import { modelApi } from '../api'
+import { modelApi, conversationApi } from '../api'
 import { useTheme } from '../composables/useTheme'
 import StatsPanel from './StatsPanel.vue'
 
@@ -137,15 +132,15 @@ const form = reactive({
 
 async function loadModels() {
   try {
-    const res = await modelApi.list()
+    const res = await modelApi.getCached()
     models.value = res.data || []
   } catch (e) {
     console.error('Failed to load models:', e)
   }
 }
 
-watch(() => props.visible, (val) => {
-  if (val && props.conversation) {
+function syncFormFromConversation() {
+  if (props.conversation) {
     form.title = props.conversation.title || ''
     form.model = props.conversation.model || ''
     form.system_prompt = props.conversation.system_prompt || ''
@@ -153,14 +148,33 @@ watch(() => props.visible, (val) => {
     form.max_tokens = props.conversation.max_tokens ?? 65536
     form.thinking_enabled = props.conversation.thinking_enabled ?? false
   }
+}
+
+// Sync form when panel opens
+watch(() => props.visible, (visible) => {
+  if (visible) {
+    syncFormFromConversation()
+  }
 })
 
-onMounted(loadModels)
+// Auto-save with debounce when form changes
+watch(form, () => {
+  if (props.visible && props.conversation) {
+    saveChanges()
+  }
+}, { deep: true })
 
-function save() {
-  emit('save', { ...form })
-  emit('close')
+async function saveChanges() {
+  if (!props.conversation) return
+  try {
+    const res = await conversationApi.update(props.conversation.id, { ...form })
+    emit('save', res.data)
+  } catch (e) {
+    console.error('Failed to save settings:', e)
+  }
 }
+
+onMounted(loadModels)
 </script>
 
 <style scoped>
@@ -358,45 +372,6 @@ function save() {
   margin: 24px 0;
 }
 
-.settings-footer {
-  padding: 16px 24px;
-  border-top: 1px solid var(--border-light);
-  display: flex;
-  justify-content: flex-end;
-  gap: 8px;
-}
-
-.btn-cancel {
-  padding: 8px 20px;
-  border-radius: 8px;
-  border: 1px solid var(--border-medium);
-  background: none;
-  color: var(--text-secondary);
-  font-size: 14px;
-  cursor: pointer;
-  transition: all 0.15s;
-}
-
-.btn-cancel:hover {
-  background: var(--bg-hover);
-  color: var(--text-primary);
-}
-
-.btn-save {
-  padding: 8px 20px;
-  border-radius: 8px;
-  border: none;
-  background: var(--accent-primary);
-  color: white;
-  font-size: 14px;
-  cursor: pointer;
-  transition: all 0.15s;
-}
-
-.btn-save:hover {
-  background: var(--accent-primary-hover);
-}
-
 .settings-stats {
   padding: 16px 24px 24px;
   border-top: 1px solid var(--border-light);