📌Overview

Purpose: This framework aims to implement a Model Context Protocol (MCP) server that standardizes communication for AI models with external data sources and tools.

Overview: The MCP Server facilitates the integration of various AI models by providing a unified interface for different Function Calls from multiple large model vendors, simplifying API tool management, and standardizing data input/output formats.

Key Features:

• Unified Interface: MCP standardizes the Function Call formats across various AI model vendors, providing a consistent experience and reducing interoperability challenges.

• Transport Protocols: Supports multiple transmission protocols, including Stdio for local deployment and Server-Sent Events (SSE) for cloud services, catering to different usage scenarios.

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Python 从0到1构建MCP Server & Client

中文 | English

简介

MCP Server 是实现模型上下文协议（MCP）的服务器，旨在为 AI 模型提供一个标准化接口，连接外部数据源和工具，例如文件系统、数据库或 API。

MCP 的优势

在 MCP 出现前，AI 调用工具基本通过 Function Call 完成，存在以下问题：

1. 不同的大模型厂商 Function Call 格式不一致
2. 大量 API 工具的输入和输出格式不一致，封装管理繁琐

MCP 相当于一个统一的 USB-C，不仅统一了不同大模型厂商的 Function Call 格式，也对相关工具的封装进行了统一。

MCP 传输协议

目前 MCP 支持两种主要的传输协议：

1. Stdio 传输协议

   • 针对本地使用
   • 需要在用户本地安装命令行工具
   • 对运行环境有特定要求

2. SSE（Server-Sent Events）传输协议

   • 针对云服务部署
   • 基于 HTTP 长连接实现

项目结构

MCP Server

• Stdio 传输协议（本地）
• SSE 传输协议（远程）

MCP Client（客户端）

• 自建客户端（Python）
• Cursor
• Cline

环境配置

1. 安装 UV 包

MacOS/Linux:

curl -LsSf https://astral.sh/uv/install.sh | sh

Windows:

powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

2. 初始化项目

# 创建项目目录
uv init mcp-server
cd mcp-server

# 创建并激活虚拟环境
uv venv
source .venv/bin/activate  # Windows: .venv\Scripts\activate

# 安装依赖
uv add "mcp[cli]" httpx

# 创建服务器实现文件
touch main.py

构建工具函数

为了让大模型能访问市面上主流框架的技术文档，我们主要通过用户输入的 query，结合指定 site 特定域名的谷歌搜索进行搜索相关网页，并对相关网页进行解析提取网页文本并返回。

1. 构建相关文档映射字典

docs_urls = {
    "langchain": "python.langchain.com/docs",
    "llama-index": "docs.llamaindex.ai/en/stable",
    "autogen": "microsoft.github.io/autogen/stable",
    "agno": "docs.agno.com",
    "openai-agents-sdk": "openai.github.io/openai-agents-python",
    "mcp-doc": "modelcontextprotocol.io",
    "camel-ai": "docs.camel-ai.org",
    "crew-ai": "docs.crewai.com"
}

2. 构建 MCP 工具

import json
import os
import httpx
from bs4 import BeautifulSoup
from mcp import tool

async def search_web(query: str) -> dict | None:
    payload = json.dumps({"q": query, "num": 3})

    headers = {
        "X-API-KEY": os.getenv("SERPER_API_KEY"),
        "Content-Type": "application/json",
    }

    async with httpx.AsyncClient() as client:
        try:
            response = await client.post(
                SERPER_URL, headers=headers, data=payload, timeout=30.0
            )
            response.raise_for_status()
            return response.json()
        except httpx.TimeoutException:
            return {"organic": []}

async def fetch_url(url: str):
    async with httpx.AsyncClient() as client:
        try:
            response = await client.get(url, timeout=30.0)
            soup = BeautifulSoup(response.text, "html.parser")
            text = soup.get_text()
            return text
        except httpx.TimeoutException:
            return "Timeout error"

@tool()
async def get_docs(query: str, library: str):
    """
    搜索给定查询和库的最新文档。
    支持 langchain、llama-index、autogen、agno、openai-agents-sdk、mcp-doc、camel-ai 和 crew-ai。

    参数:
    query: 要搜索的查询 (例如 "React Agent")
    library: 要搜索的库 (例如 "agno")

    返回:
    文档中的文本
    """
    if library not in docs_urls:
        raise ValueError(f"Library {library} not supported by this tool")

    query = f"site:{docs_urls[library]} {query}"
    results = await search_web(query)
    if len(results["organic"]) == 0:
        return "No results found"

    text = ""
    for result in results["organic"]:
        text += await fetch_url(result["link"])

    return text

封装 MCP Server (基于 Stdio 协议)

1. MCP Server (Stdio)

# main.py
from mcp.server.fastmcp import FastMCP
from dotenv import load_dotenv
import httpx
import json
import os
from bs4 import BeautifulSoup
from typing import Any
from starlette.applications import Starlette
from mcp.server.sse import SseServerTransport
from starlette.requests import Request
from starlette.routing import Mount, Route
from mcp.server import Server
import uvicorn

load_dotenv()

mcp = FastMCP("Agentdocs")

USER_AGENT = "Agentdocs-app/1.0"
SERPER_URL = "https://google.serper.dev/search"

docs_urls = {
    "langchain": "python.langchain.com/docs",
    "llama-index": "docs.llamaindex.ai/en/stable",
    "autogen": "microsoft.github.io/autogen/stable",
    "agno": "docs.agno.com",
    "openai-agents-sdk": "openai.github.io/openai-agents-python",
    "mcp-doc": "modelcontextprotocol.io",
    "camel-ai": "docs.camel-ai.org",
    "crew-ai": "docs.crewai.com"
}

async def search_web(query: str) -> dict | None:
    payload = json.dumps({"q": query, "num": 2})

    headers = {
        "X-API-KEY": os.getenv("SERPER_API_KEY"),
        "Content-Type": "application/json",
    }

    async with httpx.AsyncClient() as client:
        try:
            response = await client.post(
                SERPER_URL, headers=headers, data=payload, timeout=30.0
            )
            response.raise_for_status()
            return response.json()
        except httpx.TimeoutException:
            return {"organic": []}

async def fetch_url(url: str):
    async with httpx.AsyncClient() as client:
        try:
            response = await client.get(url, timeout=30.0)
            soup = BeautifulSoup(response.text, "html.parser")
            text = soup.get_text()
            return text
        except httpx.TimeoutException:
            return "Timeout error"

@mcp.tool()
async def get_docs(query: str, library: str):
    if library not in docs_urls:
        raise ValueError(f"Library {library} not supported by this tool")

    query = f"site:{docs_urls[library]} {query}"
    results = await search_web(query)
    if len(results["organic"]) == 0:
        return "No results found"

    text = ""
    for result in results["organic"]:
        text += await fetch_url(result["link"])

    return text

if __name__ == "__main__":
    mcp.run(transport="stdio")

启动命令：

uv run main.py

2. 客户端配置

2.1 基于 Cline

在 Visual Studio Code 安装 Cline 插件，然后配置 MCP：

{
  "mcpServers": {
    "mcp-server": {
      "command": "uv",
      "args": [
        "--directory",
        "<你的项目路径>",
        "run",
        "main.py"
      ]
    }
  }
}

2.2 基于 Cursor

项目根目录创建 .cursor 文件夹，并创建 mcp.json 文件，示例如下：

{
  "mcpServers": {
    "mcp-server": {
      "command": "uv",
      "args": [
        "--directory",
        "<你的项目路径>",
        "run",
        "main.py"
      ]
    }
  }
}

然后在 Features 中开启 MCP 服务。

通过对话，它便通过 MCP 获取相关文档信息进行回答。

构建 SSE MCP Server (基于 SSE 协议)

1. 封装 MCP Server

from mcp.server.fastmcp import FastMCP
from dotenv import load_dotenv
import httpx
import json
import os
from bs4 import BeautifulSoup
from typing import Any
from starlette.applications import Starlette
from mcp.server.sse import SseServerTransport
from starlette.requests import Request
from starlette.routing import Mount, Route
from mcp.server import Server
import uvicorn

load_dotenv()

mcp = FastMCP("docs")

USER_AGENT = "docs-app/1.0"
SERPER_URL = "https://google.serper.dev/search"

docs_urls = {
    "langchain": "python.langchain.com/docs",
    "llama-index": "docs.llamaindex.ai/en/stable",
    "autogen": "microsoft.github.io/autogen/stable",
    "agno": "docs.agno.com",
    "openai-agents-sdk": "openai.github.io/openai-agents-python",
    "mcp-doc": "modelcontextprotocol.io",
    "camel-ai": "docs.camel-ai.org",
    "crew-ai": "docs.crewai.com"
}

async def search_web(query: str) -> dict | None:
    payload = json.dumps({"q": query, "num": 2})

    headers = {
        "X-API-KEY": os.getenv("SERPER_API_KEY"),
        "Content-Type": "application/json",
    }

    async with httpx.AsyncClient() as client:
        try:
            response = await client.post(
                SERPER_URL, headers=headers, data=payload, timeout=30.0
            )
            response.raise_for_status()
            return response.json()
        except httpx.TimeoutException:
            return {"organic": []}

async def fetch_url(url: str):
    async with httpx.AsyncClient() as client:
        try:
            response = await client.get(url, timeout=30.0)
            soup = BeautifulSoup(response.text, "html.parser")
            text = soup.get_text()
            return text
        except httpx.TimeoutException:
            return "Timeout error"

@mcp.tool()
async def get_docs(query: str, library: str):
    if library not in docs_urls:
        raise ValueError(f"Library {library} not supported by this tool")

    query = f"site:{docs_urls[library]} {query}"
    results = await search_web(query)
    if len(results["organic"]) == 0:
        return "No results found"

    text = ""
    for result in results["organic"]:
        text += await fetch_url(result["link"])

    return text

def create_starlette_app(mcp_server: Server, *, debug: bool = False) -> Starlette:
    """Create a Starlette application that can serve the provided mcp server with SSE."""
    sse = SseServerTransport("/messages/")

    async def handle_sse(request: Request) -> None:
        async with sse.connect_sse(
                request.scope,
                request.receive,
                request._send,
        ) as (read_stream, write_stream):
            await mcp_server.run(
                read_stream,
                write_stream,
                mcp_server.create_initialization_options(),
            )

    return Starlette(
        debug=debug,
        routes=[
            Route("/sse", endpoint=handle_sse),
            Mount("/messages/", app=sse.handle_post_message),
        ],
    )

if __name__ == "__main__":
    mcp_server = mcp._mcp_server

    import argparse

    parser = argparse.ArgumentParser(description='Run MCP SSE-based server')
    parser.add_argument('--host', default='0.0.0.0', help='Host to bind to')
    parser.add_argument('--port', type=int, default=8020, help='Port to listen on')
    args = parser.parse_args()

    starlette_app = create_starlette_app(mcp_server, debug=True)

    uvicorn.run(starlette_app, host=args.host, port=args.port)

启动命令：

uv run main.py --host 0.0.0.0 --port 8020

以上 MCP server 代码可直接部署在云服务器。

2. 构建 MCP Client

import asyncio
import json
import os
from typing import Optional
from contextlib import AsyncExitStack
from mcp import ClientSession
from mcp.client.sse import sse_client
from openai import AsyncOpenAI
from dotenv import load_dotenv

load_dotenv()

class MCPClient:
    def __init__(self):
        self.session: Optional[ClientSession] = None
        self.exit_stack = AsyncExitStack()
        self.openai = AsyncOpenAI(api_key=os.getenv("OPENAI_API_KEY"), base_url=os.getenv("OPENAI_BASE_URL"))

    async def connect_to_sse_server(self, server_url: str):
        self._streams_context = sse_client(url=server_url)
        streams = await self._streams_context.__aenter__()

        self._session_context = ClientSession(*streams)
        self.session = await self._session_context.__aenter__()

        await self.session.initialize()

        print("Initialized SSE client...")
        print("Listing tools...")
        response = await self.session.list_tools()
        tools = response.tools
        print("\nConnected to server with tools:", [tool.name for tool in tools])

    async def cleanup(self):
        if self._session_context:
            await self._session_context.__aexit__(None, None, None)
        if self._streams_context:
            await self._streams_context.__aexit__(None, None, None)

    async def process_query(self, query: str) -> str:
        messages = [{"role": "user", "content": query}]

        response = await self.session.list_tools()
        available_tools = [{
            "type": "function",
            "function": {
                "name": tool.name,
                "description": tool.description,
                "parameters": tool.inputSchema
            }
        } for tool in response.tools]

        completion = await self.openai.chat.completions.create(
            model=os.getenv("OPENAI_MODEL"),
            max_tokens=1000,
            messages=messages,
            tools=available_tools
        )

        tool_results = []
        final_text = []
        
        assistant_message = completion.choices[0].message
        
        if assistant_message.tool_calls:
            for tool_call in assistant_message.tool_calls:
                tool_name = tool_call.function.name
                tool_args = json.loads(tool_call.function.arguments)

                result = await self.session.call_tool(tool_name, tool_args)
                tool_results.append({"call": tool_name, "result": result})
                final_text.append(f"[Calling tool {tool_name} with args {tool_args}]")

                messages.extend([
                    {"role": "assistant", "content": None, "tool_calls": [tool_call]},
                    {"role": "tool", "tool_call_id": tool_call.id, "content": result.content[0].text}
                ])

                print(f"Tool {tool_name} returned: {result.content[0].text}")

                completion = await self.openai.chat.completions.create(
                    model=os.getenv("OPENAI_MODEL"),
                    max_tokens=1000,
                    messages=messages,
                )  
                if isinstance(completion.choices[0].message.content, (dict, list)):
                    final_text.append(str(completion.choices[0].message.content))
                else:
                    final_text.append(completion.choices[0].message.content)
        else: 
            if isinstance(assistant_message.content, (dict, list)):
                final_text.append(str(assistant_message.content))
            else:
                final_text.append(assistant_message.content)

        return "\n".join(final_text)

    async def chat_loop(self):
        print("\nMCP Client Started!")
        print("Type your queries or 'quit' to exit.")
        
        while True:
            try:
                query = input("\nQuery: ").strip()
                if query.lower() == 'quit':
                    break
                response = await self.process_query(query)
                print("\n" + response)      
            except Exception as e:
                print(f"\nError: {str(e)}")

async def main():
    import sys
    if len(sys.argv) < 2:
        print("Usage: uv run client.py <URL of SSE MCP server (i.e. http://localhost:8080/sse)>")
        sys.exit(1)

    client = MCPClient()
    try:
        await client.connect_to_sse_server(server_url=sys.argv[1])
        await client.chat_loop()
    finally:
        await client.cleanup()

if __name__ == "__main__":
    asyncio.run(main())

启动命令：

uv run client.py http://0.0.0.0:8020/sse

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以上即为 Python 从 0 到 1 搭建 MCP Server 与 MCP Client 的完整教程。欢迎指正与交流。

参考资料

• https://www.youtube.com/watch?v=Ek8JHgZtmcI
• https://serper.dev/
• https://modelcontextprotocol.io/quickstart/server
• https://modelcontextprotocol.io/quickstart/client
• https://docs.cursor.com/context/model-context-protocol