stdio npx MCP server not work

[caster-Q]

When using MCP tools with stdio transport ( google's chrome-devtools-mcp via npx)，it can not work

Environment

• langchain-mcp-adapters: 0.1.14
• langchain==1.1.2
• langchain-openai==1.1.0
• Python: 3.12
• MCP Server: chrome-devtools-mcp

llm = ChatOpenAI(
    model=config['LLM']['model'],
    api_key=config['LLM']['api_key'],
    base_url=config['LLM']['base_url']
)

async def initialize_tools():
    chrome_devtools = MultiServerMCPClient(
        {
            "chrome-devtools": {
                "command": "npx",
                "args": ["-y", "chrome-devtools-mcp@latest"],
                "transport": "stdio"
            }
        }
    )
    all_tools = await chrome_devtools.get_tools()
    return all_tools

all_tools = asyncio.run(initialize_tools())

agent = create_agent(
    model=llm,
    tools=all_tools
)

async def main(query: str):
    result = await agent.ainvoke(
        input={"messages": [{"role": "user", "content": query}]},
    )
    print(result)

if __name__ == "__main__":
    test_query = "open tiktok and take a snapshot"
    result = asyncio.run(main(test_query))

[sydney-runkle]

Hi, please attach a reproducible, formatted snippet with you request. This isn't super intelligible.

[caster-Q]

Hi, please attach a reproducible, formatted snippet with you request. This isn't super intelligible.

The code has been formatted and is easy to test.