diff --git a/webui/modules/agents/langchain_agent.py b/webui/modules/agents/langchain_agent.py
index 6dd2a75e..7bef5855 100644
--- a/webui/modules/agents/langchain_agent.py
+++ b/webui/modules/agents/langchain_agent.py
@@ -143,6 +143,7 @@ def cfg_chat_openai():
     widgets['temperature'] = gr.Slider(label='Temperature', minimum=0., maximum=1., step=0.1, value=0.7, info=i18n('temperature'))
     widgets['extra_stop'] = gr.Textbox(label='Extra stop words', info=i18n('extra_stop'))
     widgets['meta_prompt'] = gr.Textbox(label='Meta prompt', info=i18n('meta_prompt'), value='Respond to the human as helpfully and accurately as possible.', lines=5)
+    widgets['greeting'] = gr.Textbox(label='Greeting', info=i18n('greeting'), value=None, lines=5)
     return widgets
 
 
@@ -150,9 +151,12 @@ def langchain_style_history(history) -> ChatMessageHistory:
     memory = ChatMessageHistory()
     for row in history['internal']:
         response = ''
+        if row[0]:
+            memory.add_user_message(row[0])
         for step in row[1]:
             if isinstance(step, msg.ToolInput):
-                response += f'Thought: {step.thought or ""}\n'
+                if step.thought:
+                    response += f'Thought: {step.thought}\n'
                 args = json.dumps({k: v['content'] for k, v in step.args.items()}, ensure_ascii=False)
                 tool_str = f'{{\n  "action": "{step.name}",\n  "action_input": {args}\n}}'
                 response += 'Action:\n```\n' + tool_str + '\n```\n'
@@ -166,7 +170,6 @@ def langchain_style_history(history) -> ChatMessageHistory:
                 response += f'Thought: {step.thought or ""}\n'
                 tool_str = f'{{\n  "action": "Final Answer",\n  "action_input": "{step.text}"\n}}'
                 response += 'Action:\n```\n' + tool_str + '\n```\n'
-        memory.add_user_message(row[0])
         memory.add_ai_message(response)
     return memory
 
diff --git a/webui/modules/chat.py b/webui/modules/chat.py
index ea98736f..6639f261 100644
--- a/webui/modules/chat.py
+++ b/webui/modules/chat.py
@@ -135,7 +135,7 @@ def redraw_html(history):
 
 
 def modify_last_message(history):
-    if len(history['visible']) > 0 and history['internal'][-1][0] != '<|BEGIN-VISIBLE-CHAT|>':
+    if len(history['visible']) > 0 and history['visible'][-1][0] != '<|BEGIN-VISIBLE-CHAT|>':
         last = history['internal'].pop()
         history['visible'].pop()
     else:
@@ -147,8 +147,14 @@ def modify_last_message(history):
 def start_new_chat():
     history = {'internal': [], 'visible': []}
 
-    unique_id = datetime.now().strftime('%Y%m%d-%H-%M-%S')
-    save_history(history, unique_id)
+    from .message_schema import Answer
+    from .settings import get_agent_settings
+    if shared.agent_name:
+        agent_settings = get_agent_settings(shared.agent_name)
+        greeting = agent_settings.get('greeting', None)
+        if greeting:
+            history['internal'] += [['', [Answer(text=greeting)]]]
+            history['visible'] += [['<|BEGIN-VISIBLE-CHAT|>', greeting]]
 
     return history
 
diff --git a/webui/modules/html_generator.py b/webui/modules/html_generator.py
index 03efc1b3..0846ea7d 100644
--- a/webui/modules/html_generator.py
+++ b/webui/modules/html_generator.py
@@ -38,6 +38,8 @@ def replace_blockquote(m):
 
 
 def convert_to_markdown(string):
+    if string == '<|BEGIN-VISIBLE-CHAT|>':
+        return ''
 
     # Blockquote
     string = re.sub(r'(^|[\n])&gt;', r'\1>', string)
diff --git a/webui/modules/i18n.yml b/webui/modules/i18n.yml
index 3803aab1..d0415992 100644
--- a/webui/modules/i18n.yml
+++ b/webui/modules/i18n.yml
@@ -81,6 +81,9 @@ langchain_agent:
   meta_prompt:
     en: "The extra meta prompt to the agent."
     zh: "额外的系统提示词"
+  greeting:
+    en: "If set, use the message as the first generated message when start a new chat."
+    zh: "如果设置，在开始新聊天时，使用此消息作为生成的第一条消息。"
 
 # agents/lagent_agent.py
 lagent_agent:
diff --git a/webui/modules/ui_chat.py b/webui/modules/ui_chat.py
index c8736639..685afb2f 100644
--- a/webui/modules/ui_chat.py
+++ b/webui/modules/ui_chat.py
@@ -95,7 +95,7 @@ def create_event_handlers():
         .then(chat.redraw_html, gradio('history'), gradio('display'))
 
     shared.gradio['Start new chat']\
-        .click(lambda: {'internal': [], 'visible': []}, None, gradio('history'))\
+        .click(chat.start_new_chat, None, gradio('history'))\
         .then(chat.redraw_html, gradio('history'), gradio('display'))\
         .then(lambda: gr.update(value=None), None, gradio('unique_id'))
 
diff --git a/webui/modules/utils.py b/webui/modules/utils.py
index f9d08ec7..08ad8d0e 100644
--- a/webui/modules/utils.py
+++ b/webui/modules/utils.py
@@ -29,12 +29,13 @@ def parse_inputs(toolmeta: ToolMeta, args: Union[str, tuple, dict]) -> Mapping[s
 
     parsed_args = {}
     for k, v in args.items():
-        p = params[k]
-        if p.type is ImageIO:
+        if k not in params:
+            parsed_args[k] = dict(type='text', content=v)
+        elif params[k].type is ImageIO:
             parsed_args[k] = dict(type='image', content=v)
-        elif p.type is AudioIO:
+        elif params[k].type is AudioIO:
             parsed_args[k] = dict(type='audio', content=v)
-        elif p.type is File:
+        elif params[k].type is File:
             parsed_args[k] = dict(type='file', content=v)
         else:
             parsed_args[k] = dict(type='text', content=v)