from mcp.server.fastmcp import FastMCP

mcp = FastMCP("order-mcp-server", log_level="ERROR")
@mcp.tool(description="Query logistics information")
async def query_logistics(order_id: str) -> str:

  //Search for logistics information. 
  //When users need to query logistics information based on the order number, call this tool
  result="";
  return result

if __name__ == "__main__":
    mcp.run(transport="sse")
```
`
MCP client code：
`    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])

    result = await self.session.call_tool("query_logistics", {"order_id":"123"})
    print("Result of query_logistics tool:", result)`
`
error info ：
`Connected to server with tools: ['query_logistics']
Result of add tool: meta=None content=[TextContent(type='text', text='Error executing tool query_logistics: 1 validation error for query_logisticsArguments\norder_id\n Input should be a valid string [type=string_type, input_value=123, input_type=int]\n For further information visit https://errors.pydantic.dev/2.10/v/string_type', annotations=None)] isError=True
`
Data type conversion error