Cannot start client with npx

[nmoeller]

Describe the bug
I wanted to try running the client sample with the server-everything mcp server.
Unfortunatly i always have the issue that i get the following error message :

[[WinError 2] The system cannot find the file specified](https://discuss.python.org/t/filenotfounderror-winerror-2-the-system-cannot-find-the-file-specified/9757)

The issues seems to be related that it cannot find npx, but i have installed node,npm and npx.
When i am running npx -v in a standalone console it responds with 10.8.0. Also when debugging the get_default_environment() contains my Path variable which contains the path to node / npx.

Do you have any idea of what could be wrong ? Could somebody verify that this works on other Machines as expected and it's due to my machine ?

from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client
from mcp import types

# Create server parameters for stdio connection
server_params = StdioServerParameters(
    command="npx", # Executable
    args=["-y @modelcontextprotocol/server-everything"], # Optional command line arguments
    env=None # Optional environment variables
)

# Optional: create a sampling callback
async def handle_sampling_message(message: types.CreateMessageRequestParams) -> types.CreateMessageResult:
    return types.CreateMessageResult(
        role="assistant",
        content=types.TextContent(
            type="text",
            text="Hello, world! from model",
        ),
        model="gpt-3.5-turbo",
        stopReason="endTurn",
    )

async def run():
    async with stdio_client(server_params) as (read, write):
        async with ClientSession(read, write, sampling_callback=handle_sampling_message) as session:
            # Initialize the connection
            await session.initialize()

            # List available prompts
            prompts = await session.list_prompts()

            # Get a prompt
            prompt = await session.get_prompt("example-prompt", arguments={"arg1": "value"})

            # List available resources
            resources = await session.list_resources()

            # List available tools
            tools = await session.list_tools()

            # Read a resource
            content, mime_type = await session.read_resource("file://some/path")

            # Call a tool
            result = await session.call_tool("tool-name", arguments={"arg1": "value"})

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

[dsp-ant]

I would try providing the absolute path to NPX. If that works then the culprit would be path handling