content: """
  FastMCP Echo Server with direct CallToolResult return
  """
  
  from typing import Annotated
  
  from pydantic import BaseModel
  
  from mcp.server.fastmcp import FastMCP
  from mcp.types import CallToolResult, TextContent
  
  mcp = FastMCP("Echo Server")
  
  
  class EchoResponse(BaseModel):
      text: str
  
  
  @mcp.tool()
  def echo(text: str) -> Annotated[CallToolResult, EchoResponse]:
      """Echo the input text with structure and metadata"""
      return CallToolResult(
          content=[TextContent(type="text", text=text)], structuredContent={"text": text}, _meta={"some": "metadata"}
      )
  