feat: Add initial implementation of chatbot and mcp tool with Gradio interface and necessary dependencies

.gitignore

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agent.py

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+from langchain_mcp_adapters.client import MultiServerMCPClient
+from langgraph.prebuilt import create_react_agent
+from langchain_community.chat_models import ChatTongyi
+
+llm = ChatTongyi(model_name="qwen-turbo")
+
+client = MultiServerMCPClient(
+    {
+        "filesystem": {
+            "disabled": False,
+            "timeout": 60,
+            "command": "npx",
+            "args": [
+                "-y",
+                "@modelcontextprotocol/server-filesystem",
+                "/root/project/python_test",
+            ],
+            "transport": "stdio",
+        }
+    }
+)
+
+
+async def get_agent():
+    tools = await client.get_tools()
+    agent = create_react_agent(llm, tools)
+    return agent

app.py

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+import gradio as gr
+
+from langchain.schema import HumanMessage, AIMessage
+
+from agent import get_agent
+
+# 获取模型回复
+agent = None
+
+async def initialize_agent_once():
+    global agent
+    if agent is None:
+        agent = await get_agent()
+    return agent
+
+
+async def respond(message, chat_history):
+    
+    messages = []
+    for human_msg, ai_msg in chat_history:
+        messages.append(HumanMessage(content=human_msg))
+        messages.append(AIMessage(content=ai_msg))
+    messages.append(HumanMessage(content=message)) 
+        
+    agent = await initialize_agent_once() 
+    response = await agent.ainvoke({"messages": messages})
+    
+    chat_history.append((message, response['messages'][-1].content))
+    return "", chat_history
+
+with gr.Blocks() as app:
+    gr.Markdown("# 旅游攻略助手")
+    
+    with gr.Row():
+        with gr.Column(scale=3):
+            chatbot = gr.Chatbot(height=500)
+        with gr.Column(scale=1):
+            gr.Markdown("### 说明\n"
+                        "- 请在下方输入框中输入您的问题\n"
+                        "- 点击发送或按Enter键提交\n"
+                        "- 支持多轮对话")
+    
+    with gr.Row():
+        msg = gr.Textbox(
+            label="您的问题",
+            placeholder="请输入您的旅游需求，例如：推荐北京的景点并规划一日游路线...",
+            lines=3
+        )
+    
+    with gr.Row():
+        submit_btn = gr.Button("发送", variant="primary")
+        clear_btn = gr.Button("清除")
+    
+    # 设置事件处理
+    submit_btn.click(respond, [msg, chatbot], [msg, chatbot])
+    msg.submit(respond, [msg, chatbot], [msg, chatbot])
+    clear_btn.click(lambda: None, None, chatbot, queue=False)
+
+app.launch()

requirements.txt

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+# requirements.txt
+langchain==0.3.25
+openai==0.27.8
+gradio
+requests==2.31.0
+langchain-community==0.3.25
+langchain-community
+langchain-mcp-adapters
+langgraph
+dashscope