xerrors
Error: 添加MCP：@benborla29/[email protected] （MySQL工具）一直卡着？请问这是怎么回事呢？
1️⃣ 描述一下问题
"mcp_server_mysql": {
"command": "npx",
"args": ["-y", "@benborla29/[email protected]"],
"env": {
"MYSQL_HOST": "localhost",
"MYSQL_PORT": "3306",
"MYSQL_USER": "root",
"MYSQL_PASS": "2211",
"MYSQL_DB": "gy",
},
"transport": "stdio"
},
2️⃣ 报错日志
请运行以下命令，并提供部分相关日志：
运行之后，一直卡着
11-28 20:44:35 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: mcp_server_mysql
{'mcp_server_mysql': {'command': 'npx', 'args': ['-y', '@benborla29/[email protected]'], 'env': {'MYSQL_HOST': 'localhost', 'MYSQL_PORT': '3306', 'MYSQL_USER': 'root', 'MYSQL_PASS': '2211', 'MYSQL_DB': 'gy'}, 'transport': 'stdio'}}
11-28 20:44:35 INFO mcp.py:79: Initialized MCP client with servers: ['mcp_server_mysql']
3️⃣ 相关截图
#️⃣ 其他相关信息
这是MCP.py,请博主看看呢
`"""MCP Client setup and management for LangGraph ReAct Agent."""
import asyncio
from collections.abc import Callable
from typing import Any, cast
from langchain_mcp_adapters.client import ( # type: ignore[import-untyped]
MultiServerMCPClient,
)
# from langchain_mcp_adapters.client import MultiServerMCPClient
from src.utils import logger
# Global MCP tools cache
_mcp_tools_cache: dict[str, list[Callable[..., Any]]] = {}
# MCP Server configurations
MCP_SERVERS = {
# "sequentialthinking": {
# "command": "npx",
# "args": ["-y", "@modelcontextprotocol/server-sequential-thinking"],
# "transport": "stdio"
# },
# "weather": {
# "command": "python",
# "args": ["-u",
# r"./mcp_servers\weather_server.py"],
# "transport": "stdio"
# },
# "mcp_server_chart": {
# "command": "npx",
# "args": ["-y", "@antv/mcp-server-chart"],
# "transport": "stdio"
# },
# "mcp-echarts": {
# "args": [
# "-y",
# "mcp-echarts"
# ],
# "command": "npx",
# "transport": "stdio",
# },
"mcp_server_mysql": {
"command": "npx",
"args": ["-y", "@benborla29/[email protected]"],
"env": {
"MYSQL_HOST": "localhost",
"MYSQL_PORT": "3306",
"MYSQL_USER": "root",
"MYSQL_PASS": "2211",
"MYSQL_DB": "gy",
},
"transport": "stdio"
},
}
async def get_mcp_client(
server_configs: dict[str, Any] | None = None,
) -> MultiServerMCPClient | None:
"""Initializes an MCP client with the given server configurations."""
configs = server_configs or MCP_SERVERS
print(configs)
try:
client = MultiServerMCPClient(configs) # pyright: ignore[reportArgumentType]
logger.info(f"Initialized MCP client with servers: {list(configs.keys())}")
return client
except Exception as e:
logger.error("Failed to initialize MCP client: {}", e)
return None
async def get_mcp_tools(server_name: str, additional_servers: dict[str, dict] = None) -> list[Callable[..., Any]]:
"""Get MCP tools for a specific server, initializing client if needed."""
global _mcp_tools_cache
# Return cached tools if available
if server_name in _mcp_tools_cache:
return _mcp_tools_cache[server_name]
mcp_servers = MCP_SERVERS | (additional_servers or {})
try:
assert server_name in mcp_servers, f"Server {server_name} not found in MCP_SERVERS"
client = await get_mcp_client({server_name: mcp_servers[server_name]})
# print(client)
if client is None:
logger.error("Failed to initialize MCP client")
return []
# Get all tools and filter by server (if tools have server metadata)
all_tools = await client.get_tools()
print(all_tools)
tools = cast(list[Callable[..., Any]], all_tools)
print(tools)
_mcp_tools_cache[server_name] = tools
logger.info(f"Loaded {len(tools)} tools from MCP server '{server_name}'")
return tools
except AssertionError as e:
logger.warning(f"Failed to load tools from MCP server '{server_name}': {e}")
return []
except Exception as e:
logger.error(f"Failed to load tools from MCP server '{server_name}': {e}")
return []
async def get_all_mcp_tools() -> list[Callable[..., Any]]:
"""Get all tools from all configured MCP servers."""
all_tools = []
for server_name in MCP_SERVERS.keys():
tools = await get_mcp_tools(server_name)
all_tools.extend(tools)
return all_tools
def add_mcp_server(name: str, config: dict[str, Any]) -> None:
"""Add a new MCP server configuration."""
MCP_SERVERS[name] = config
# Clear client to force reinitialization with new config
clear_mcp_cache()
def clear_mcp_cache() -> None:
"""Clear the MCP tools cache (useful for testing)."""
global _mcp_tools_cache
_mcp_tools_cache = {}`
奇了怪了；目前测试下来，使用 uvx / uv 启动的项目，就是启动的时候加载久一点，但还是能用。其余的都能成功，但是 npx 启用的 mcp 就会报错（不过这个mcp工具用着不舒服，我自己使用的是自己写的 mysql 工具，没有使用 mcp） 。
MCP_SERVERS = {
# （1）远程 host 的 MCP
"sequentialthinking": {
"url": "https://remote.mcpservers.org/sequentialthinking/mcp",
"transport": "streamable_http",
},
# （2）本地使用 npx 运行；需要在 docker 内安装 npx （**失败**）
"mysql-npx": {
"command": "npx",
"args": ["-y", "src/agents/common/mcp_repos/mcp-server-mysql"],
"env": {
"MYSQL_HOST": "172.19.13.6",
"MYSQL_PORT": "3306",
"MYSQL_USER": "read-only",
"MYSQL_PASS": "password123",
"MYSQL_DB": "feed"
},
"transport": "stdio"
},
# （3）本地使用 uvx 运行
"mysql-mcp-server-uvx": {
"command": "uvx",
"args": ["mysql_mcp_server"],
"env": {
"MYSQL_DATABASE": "your_database",
"MYSQL_HOST": "localhost",
"MYSQL_PASSWORD": "your_password",
"MYSQL_PORT": "3306",
"MYSQL_USER": "your_username"
},
"transport": "stdio"
},
# （4）本地使用 uv + git clone repo 运行（加载速度快）
"arxiv-mcp-server": {
"command": "uv",
"args": [
"tool",
"run",
"arxiv-mcp-server",
"--storage-path", "src/agents/mcp_repos/arxiv-mcp-server"
],
"transport": "stdio"
}
}
11-30 23:59:47 INFO mcp.py:104: Loaded 1 tools from MCP server 'sequentialthinking'
11-30 23:59:47 INFO dynamic_tool_middleware.py:38: Registered 1 tools from sequentialthinking
11-30 23:59:47 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: mysql-npx
11-30 23:59:47 INFO mcp.py:76: Initialized MCP client with servers: ['mysql-npx']
11-30 23:59:48 ERROR mcp.py:110: Failed to load tools from MCP server 'mysql-npx': unhandled errors in a TaskGroup (1 sub-exception), traceback: + Exception Group Traceback (most recent call last):
| File "/app/src/agents/common/mcp.py", line 100, in get_mcp_tools
| all_tools = await client.get_tools()
| ^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/client.py", line 189, in get_tools
| tools_list = await asyncio.gather(*load_mcp_tool_tasks)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/tools.py", line 369, in load_mcp_tools
| async with create_session(
| ^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/contextlib.py", line 231, in __aexit__
| await self.gen.athrow(value)
| File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 418, in create_session
| async with _create_stdio_session(**params) as session:
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/contextlib.py", line 231, in __aexit__
| await self.gen.athrow(value)
| File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 231, in _create_stdio_session
| stdio_client(server_params) as (read, write),
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/contextlib.py", line 231, in __aexit__
| await self.gen.athrow(value)
| File "/usr/local/lib/python3.12/site-packages/mcp/client/stdio/__init__.py", line 183, in stdio_client
| anyio.create_task_group() as tg,
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 783, in __aexit__
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Exception Group Traceback (most recent call last):
| File "/usr/local/lib/python3.12/site-packages/mcp/client/stdio/__init__.py", line 189, in stdio_client
| yield read_stream, write_stream
| File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 232, in _create_stdio_session
| ClientSession(read, write, **(session_kwargs or {})) as session,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/site-packages/mcp/shared/session.py", line 220, in __aexit__
| return await self._task_group.__aexit__(exc_type, exc_val, exc_tb)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 783, in __aexit__
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 234, in _create_stdio_session
| yield session
| File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 419, in create_session
| yield session
| File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/tools.py", line 372, in load_mcp_tools
| await tool_session.initialize()
| File "/usr/local/lib/python3.12/site-packages/mcp/client/session.py", line 152, in initialize
| result = await self.send_request(
| ^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/site-packages/mcp/shared/session.py", line 288, in send_request
| raise McpError(response_or_error.error)
| mcp.shared.exceptions.McpError: Connection closed
+------------------------------------
11-30 23:59:48 INFO dynamic_tool_middleware.py:38: Registered 0 tools from mysql-npx
11-30 23:59:48 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: mysql-mcp-server-uvx
11-30 23:59:48 INFO mcp.py:76: Initialized MCP client with servers: ['mysql-mcp-server-uvx']
11-30 23:59:49 INFO mcp.py:104: Loaded 1 tools from MCP server 'mysql-mcp-server-uvx'
11-30 23:59:49 INFO dynamic_tool_middleware.py:38: Registered 1 tools from mysql-mcp-server-uvx
11-30 23:59:49 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: arxiv-mcp-server
11-30 23:59:49 INFO mcp.py:76: Initialized MCP client with servers: ['arxiv-mcp-server']
11-30 23:59:49 INFO mcp.py:104: Loaded 4 tools from MCP server 'arxiv-mcp-server'
11-30 23:59:49 INFO dynamic_tool_middleware.py:38: Registered 4 tools from arxiv-mcp-server
我这边是一直卡住 好像没有报错 其他的npx工具都可以 唯独就是这个不行
---原始邮件--- 发件人: "Wenjie @.> 发送时间: 2025年12月1日(周一) 凌晨0:05 收件人: @.>; 抄送: @.@.>; 主题: Re: [xerrors/Yuxi-Know] Error: @.@. （MySQL工具）一直卡着？请问这是怎么回事呢？ (Issue #351)
xerrors left a comment (xerrors/Yuxi-Know#351)
奇了怪了；目前测试下来，使用 uvx / uv 启动的项目，就是启动的时候加载久一点，但还是能用。其余的都能成功，但是 npx 启用的 mcp 就会报错（不过这个mcp工具用着不舒服，我自己使用的是自己写的 mysql 工具，没有使用 mcp） 。
MCP_SERVERS = { # （1）远程 host 的 MCP "sequentialthinking": { "url": "https://remote.mcpservers.org/sequentialthinking/mcp", "transport": "streamable_http", }, # （2）本地使用 npx 运行；需要在 docker 内安装 npx （失败） "mysql-npx": { "command": "npx", "args": ["-y", "src/agents/common/mcp_repos/mcp-server-mysql"], "env": { "MYSQL_HOST": "172.19.13.6", "MYSQL_PORT": "3306", "MYSQL_USER": "read-only", "MYSQL_PASS": "password123", "MYSQL_DB": "feed" }, "transport": "stdio" }, # （3）本地使用 uvx 运行 "mysql-mcp-server-uvx": { "command": "uvx", "args": ["mysql_mcp_server"], "env": { "MYSQL_DATABASE": "your_database", "MYSQL_HOST": "localhost", "MYSQL_PASSWORD": "your_password", "MYSQL_PORT": "3306", "MYSQL_USER": "your_username" }, "transport": "stdio" }, # （4）本地使用 uv + git clone repo 运行（加载速度快） "arxiv-mcp-server": { "command": "uv", "args": [ "tool", "run", "arxiv-mcp-server", "--storage-path", "src/agents/mcp_repos/arxiv-mcp-server" ], "transport": "stdio" } }
11-30 23:59:47 INFO mcp.py:104: Loaded 1 tools from MCP server 'sequentialthinking' 11-30 23:59:47 INFO dynamic_tool_middleware.py:38: Registered 1 tools from sequentialthinking 11-30 23:59:47 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: mysql-npx 11-30 23:59:47 INFO mcp.py:76: Initialized MCP client with servers: ['mysql-npx'] 11-30 23:59:48 ERROR mcp.py:110: Failed to load tools from MCP server 'mysql-npx': unhandled errors in a TaskGroup (1 sub-exception), traceback: + Exception Group Traceback (most recent call last): | File "/app/src/agents/common/mcp.py", line 100, in get_mcp_tools | all_tools = await client.get_tools() | ^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/client.py", line 189, in get_tools | tools_list = await asyncio.gather(*load_mcp_tool_tasks) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/tools.py", line 369, in load_mcp_tools | async with create_session( | ^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/contextlib.py", line 231, in aexit | await self.gen.athrow(value) | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 418, in create_session | async with _create_stdio_session(*params) as session: | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/contextlib.py", line 231, in aexit | await self.gen.athrow(value) | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 231, in _create_stdio_session | stdio_client(server_params) as (read, write), | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/contextlib.py", line 231, in aexit | await self.gen.athrow(value) | File "/usr/local/lib/python3.12/site-packages/mcp/client/stdio/init.py", line 183, in stdio_client | anyio.create_task_group() as tg, | ^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 783, in aexit | raise BaseExceptionGroup( | ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception) +-+---------------- 1 ---------------- | Exception Group Traceback (most recent call last): | File "/usr/local/lib/python3.12/site-packages/mcp/client/stdio/init.py", line 189, in stdio_client | yield read_stream, write_stream | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 232, in _create_stdio_session | ClientSession(read, write, (session_kwargs or {})) as session, | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/mcp/shared/session.py", line 220, in aexit | return await self._task_group.aexit(exc_type, exc_val, exc_tb) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 783, in aexit | raise BaseExceptionGroup( | ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception) +-+---------------- 1 ---------------- | Traceback (most recent call last): | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 234, in _create_stdio_session | yield session | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 419, in create_session | yield session | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/tools.py", line 372, in load_mcp_tools | await tool_session.initialize() | File "/usr/local/lib/python3.12/site-packages/mcp/client/session.py", line 152, in initialize | result = await self.send_request( | ^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/mcp/shared/session.py", line 288, in send_request | raise McpError(response_or_error.error) | mcp.shared.exceptions.McpError: Connection closed +------------------------------------ 11-30 23:59:48 INFO dynamic_tool_middleware.py:38: Registered 0 tools from mysql-npx 11-30 23:59:48 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: mysql-mcp-server-uvx 11-30 23:59:48 INFO mcp.py:76: Initialized MCP client with servers: ['mysql-mcp-server-uvx'] 11-30 23:59:49 INFO mcp.py:104: Loaded 1 tools from MCP server 'mysql-mcp-server-uvx' 11-30 23:59:49 INFO dynamic_tool_middleware.py:38: Registered 1 tools from mysql-mcp-server-uvx 11-30 23:59:49 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: arxiv-mcp-server 11-30 23:59:49 INFO mcp.py:76: Initialized MCP client with servers: ['arxiv-mcp-server'] 11-30 23:59:49 INFO mcp.py:104: Loaded 4 tools from MCP server 'arxiv-mcp-server' 11-30 23:59:49 INFO dynamic_tool_middleware.py:38: Registered 4 tools from arxiv-mcp-server
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还有一个好像博主你的参数和我的有点不一样，我是使用的官方的
---原始邮件--- 发件人: "Wenjie @.> 发送时间: 2025年12月1日(周一) 凌晨0:05 收件人: @.>; 抄送: @.@.>; 主题: Re: [xerrors/Yuxi-Know] Error: @.@. （MySQL工具）一直卡着？请问这是怎么回事呢？ (Issue #351)
xerrors left a comment (xerrors/Yuxi-Know#351)
奇了怪了；目前测试下来，使用 uvx / uv 启动的项目，就是启动的时候加载久一点，但还是能用。其余的都能成功，但是 npx 启用的 mcp 就会报错（不过这个mcp工具用着不舒服，我自己使用的是自己写的 mysql 工具，没有使用 mcp） 。
MCP_SERVERS = { # （1）远程 host 的 MCP "sequentialthinking": { "url": "https://remote.mcpservers.org/sequentialthinking/mcp", "transport": "streamable_http", }, # （2）本地使用 npx 运行；需要在 docker 内安装 npx （失败） "mysql-npx": { "command": "npx", "args": ["-y", "src/agents/common/mcp_repos/mcp-server-mysql"], "env": { "MYSQL_HOST": "172.19.13.6", "MYSQL_PORT": "3306", "MYSQL_USER": "read-only", "MYSQL_PASS": "password123", "MYSQL_DB": "feed" }, "transport": "stdio" }, # （3）本地使用 uvx 运行 "mysql-mcp-server-uvx": { "command": "uvx", "args": ["mysql_mcp_server"], "env": { "MYSQL_DATABASE": "your_database", "MYSQL_HOST": "localhost", "MYSQL_PASSWORD": "your_password", "MYSQL_PORT": "3306", "MYSQL_USER": "your_username" }, "transport": "stdio" }, # （4）本地使用 uv + git clone repo 运行（加载速度快） "arxiv-mcp-server": { "command": "uv", "args": [ "tool", "run", "arxiv-mcp-server", "--storage-path", "src/agents/mcp_repos/arxiv-mcp-server" ], "transport": "stdio" } }
11-30 23:59:47 INFO mcp.py:104: Loaded 1 tools from MCP server 'sequentialthinking' 11-30 23:59:47 INFO dynamic_tool_middleware.py:38: Registered 1 tools from sequentialthinking 11-30 23:59:47 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: mysql-npx 11-30 23:59:47 INFO mcp.py:76: Initialized MCP client with servers: ['mysql-npx'] 11-30 23:59:48 ERROR mcp.py:110: Failed to load tools from MCP server 'mysql-npx': unhandled errors in a TaskGroup (1 sub-exception), traceback: + Exception Group Traceback (most recent call last): | File "/app/src/agents/common/mcp.py", line 100, in get_mcp_tools | all_tools = await client.get_tools() | ^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/client.py", line 189, in get_tools | tools_list = await asyncio.gather(*load_mcp_tool_tasks) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/tools.py", line 369, in load_mcp_tools | async with create_session( | ^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/contextlib.py", line 231, in aexit | await self.gen.athrow(value) | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 418, in create_session | async with _create_stdio_session(*params) as session: | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/contextlib.py", line 231, in aexit | await self.gen.athrow(value) | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 231, in _create_stdio_session | stdio_client(server_params) as (read, write), | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/contextlib.py", line 231, in aexit | await self.gen.athrow(value) | File "/usr/local/lib/python3.12/site-packages/mcp/client/stdio/init.py", line 183, in stdio_client | anyio.create_task_group() as tg, | ^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 783, in aexit | raise BaseExceptionGroup( | ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception) +-+---------------- 1 ---------------- | Exception Group Traceback (most recent call last): | File "/usr/local/lib/python3.12/site-packages/mcp/client/stdio/init.py", line 189, in stdio_client | yield read_stream, write_stream | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 232, in _create_stdio_session | ClientSession(read, write, (session_kwargs or {})) as session, | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/mcp/shared/session.py", line 220, in aexit | return await self._task_group.aexit(exc_type, exc_val, exc_tb) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 783, in aexit | raise BaseExceptionGroup( | ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception) +-+---------------- 1 ---------------- | Traceback (most recent call last): | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 234, in _create_stdio_session | yield session | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/sessions.py", line 419, in create_session | yield session | File "/usr/local/lib/python3.12/site-packages/langchain_mcp_adapters/tools.py", line 372, in load_mcp_tools | await tool_session.initialize() | File "/usr/local/lib/python3.12/site-packages/mcp/client/session.py", line 152, in initialize | result = await self.send_request( | ^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/mcp/shared/session.py", line 288, in send_request | raise McpError(response_or_error.error) | mcp.shared.exceptions.McpError: Connection closed +------------------------------------ 11-30 23:59:48 INFO dynamic_tool_middleware.py:38: Registered 0 tools from mysql-npx 11-30 23:59:48 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: mysql-mcp-server-uvx 11-30 23:59:48 INFO mcp.py:76: Initialized MCP client with servers: ['mysql-mcp-server-uvx'] 11-30 23:59:49 INFO mcp.py:104: Loaded 1 tools from MCP server 'mysql-mcp-server-uvx' 11-30 23:59:49 INFO dynamic_tool_middleware.py:38: Registered 1 tools from mysql-mcp-server-uvx 11-30 23:59:49 INFO dynamic_tool_middleware.py:33: Pre-loading MCP tools from: arxiv-mcp-server 11-30 23:59:49 INFO mcp.py:76: Initialized MCP client with servers: ['arxiv-mcp-server'] 11-30 23:59:49 INFO mcp.py:104: Loaded 4 tools from MCP server 'arxiv-mcp-server' 11-30 23:59:49 INFO dynamic_tool_middleware.py:38: Registered 4 tools from arxiv-mcp-server
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测试了一下 这个mcp本身是没有问题的 可能是这个项目哪一个地方影响到这个 触发了BUG 我单独通过langchain和langgraph实现的 是可以调用的
"mysql-mcp-server-uvx": { "command": "uvx", "args": ["mysql_mcp_server"], "env": { "MYSQL_HOST": "127.0.0.1", "MYSQL_PORT": "3306", "MYSQL_USER": "root", "MYSQL_PASSWORD": "2211", "MYSQL_DATABASE": "gy" }, "transport": "stdio" }
12-01 11:07:10 ERROR mcp.py:200: Failed to load tools from MCP server 'mysql-mcp-server-uvx': [WinError 2] 系统找不到指定的文件。
博主使用这个mcp工具为啥找不到文件 我是中Windows上跑的