content: """
  FastMCP Complex inputs Example
  
  Demonstrates validation via pydantic with complex models.
  """
  
  from typing import Annotated
  
  from pydantic import BaseModel, Field
  
  from mcp.server.fastmcp import FastMCP
  
  mcp = FastMCP("Shrimp Tank")
  
  
  class ShrimpTank(BaseModel):
      class Shrimp(BaseModel):
          name: Annotated[str, Field(max_length=10)]
  
      shrimp: list[Shrimp]
  
  
  @mcp.tool()
  def name_shrimp(
      tank: ShrimpTank,
      # You can use pydantic Field in function signatures for validation.
      extra_names: Annotated[list[str], Field(max_length=10)],
  ) -> list[str]:
      """List all shrimp names in the tank"""
      return [shrimp.name for shrimp in tank.shrimp] + extra_names
  