Python 从0到1构建MCP Server & Client
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รันบน PlugMCP
A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.
เปิดจากผู้เผยแพร่
中文 | English
支持查询主流agent框架技术文档的MCP server（支持stdio和sse两种传输协议）, 支持 langchain、llama-index、autogen、agno、openai-agents-sdk、mcp-doc、camel-ai 和 crew-ai
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。
在 MCP 出现前，AI 调用工具基本通过 Function Call 完成，存在以下问题：
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。
目前 MCP 支持两种主要的传输协议：
Stdio 传输协议
SSE（Server-Sent Events）传输协议
MacOS/Linux:
curl -LsSf https://astral.sh/uv/install.sh | sh
Windows:
powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"
# 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
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。
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"
}
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
# 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
import httpx
from mcp.server.fastmcp import FastMCP
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):
"""
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
if __name__ == "__main__":
mcp.run(transport="stdio")
启动命令：
uv run main.py
首先在 Visual Studio Code 安装 Cline 插件，然后进行配置 MCP
{
"mcpServers": {
"mcp-server": {
"command": "uv",
"args": [
"--directory",
"<你的项目路径>",
"run",
"main.py"
]
}
}
}
成功绑定如图（左侧绿灯）：
项目根目录创建 .cursor 文件夹，并创建 mcp.json 文件，如：
然后粘贴以下内容到 mcp.json
{
"mcpServers": {
"mcp-server": {
"command": "uv",
"args": [
"--directory",
"<你的项目路径>",
"run",
"main.py"
]
}
}
}
成功配置如图：
在 Features 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：
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
import httpx
from mcp.server.fastmcp import FastMCP
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):
"""
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
## sse传输
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, # noqa: SLF001
) 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()
# Bind SSE request handling to MCP server
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 代码直接在你的云服务器跑即可。
import asyncio
import json
import os
from typing import Optional
from contextlib import AsyncExitStack
import time
from mcp import ClientSession
from mcp.client.sse import sse_client
from openai import AsyncOpenAI
from dotenv import load_dotenv
load_dotenv() # load environment variables from .env
class MCPClient:
def __init__(self):
# Initialize session and client objects
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):
"""Connect to an MCP server running with SSE transport"""
# Store the context managers so they stay alive
self._streams_context = sse_client(url=server_url)
streams = await self._streams_context.__aenter__()
self._session_context = ClientSession(*streams)
self.session: ClientSession = await self._session_context.__aenter__()
# Initialize
await self.session.initialize()
# List available tools to verify connection
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):
"""Properly clean up the session and streams"""
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:
"""Process a query using OpenAI API and available tools"""
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]
# Initial OpenAI API call
completion = await self.openai.chat.completions.create(
model=os.getenv("OPENAI_MODEL"),
max_tokens=1000,
messages=messages,
tools=available_tools
)
# Process response and handle tool calls
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)
# Execute tool call
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}]")
# Continue conversation with tool results
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}")
print("messages", messages)
# Get next response from OpenAI
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):
"""Run an interactive chat loop"""
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():
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__":
import sys
asyncio.run(main())
启动命令：
uv run client.py http://0.0.0.0:8020/sse
Client 日志：
Server 日志：
以上便是 Python 从 0 到 1 搭建 MCP Server 以及 MCP Client 的完整教程。有不对的地方请多多指教。
参考相关资料：
支持查询主流agent框架技术文档的MCP server（支持stdio和sse两种传输协议）, 支持 langchain、llama-index、autogen、agno、openai-agents-sdk、mcp-doc、camel-ai 和 crew-ai
เครื่องมือ
ยังไม่มีรายการเครื่องมือ เซิร์ฟเวอร์แบบรีโมตจะได้รายการหลังการตรวจสอบสถานะครั้งแรก
FAQ
คัดลอกคอนฟิก stdio สำหรับ Cursor, Claude Desktop, Claude Code หรือ VS Code ได้ในหน้านี้ คอนฟิกนี้ใช้การติดตั้งของผู้เผยแพร่ ไม่ใช่พร็อกซีของ PlugMCP
ระเบียนนี้ไม่ได้ระบุตัวแปรสภาพแวดล้อมที่จำเป็น
Python MCP Server Client ทำงานแบบโลคัลผ่าน stdio
ตรวจสอบล่าสุดเมื่อ 2026-11-05 支持查询主流agent框架技术文档的MCP server（支持stdio和sse两种传输协议）, 支持 langchain、llama-index、autogen、agno、openai-agents-sdk、mcp-doc、camel-ai 和 crew-ai
