Builtin tools that have tool_context as a parameter don't get a description from the doc-string #551

def build_function_declaration(
    func: Union[Callable, BaseModel],
    ignore_params: Optional[list[str]] = None,
    variant: Literal['GOOGLE_AI', 'VERTEX_AI', 'DEFAULT'] = 'GOOGLE_AI',
) -> types.FunctionDeclaration:
  signature = inspect.signature(func)
  new_func = None
  if not ignore_params:
    ignore_params = []
  for name, _ in signature.parameters.items():
    if name in ignore_params:
      should_update_signature = True
      break
  if should_update_signature:
    new_params = [
        param
        for name, param in signature.parameters.items()
        if name not in ignore_params
    ]
    if isinstance(func, type):
      fields = {
          name: (param.annotation, param.default)
          for name, param in signature.parameters.items()
          if name not in ignore_params
      }
      new_func = create_model(func.__name__, **fields)
    else:
      new_sig = signature.replace(parameters=new_params)
      new_func = FunctionType(
          func.__code__,
          func.__globals__,
          func.__name__,
          func.__defaults__,
          func.__closure__,
      )
      new_func.__signature__ = new_sig

      # FIX
      new_func.__doc__ = func.__doc__

  return (
      from_function_with_options(func, variant)
      if not should_update_signature
      else from_function_with_options(new_func, variant)
  )