def append_instructions(self, instructions: list[str]) -> None:
    """Appends instructions to the system instruction.

    Args:
      instructions: The instructions to append.
    """

    if self.config.system_instruction:
      self.config.system_instruction += '\n\n' + '\n\n'.join(instructions)
    else:
      self.config.system_instruction = '\n\n'.join(instructions)
Appends instructions to the system instruction.

    Args:
      instructions: The instructions to append.
    
src/google/adk/models/llm_request.py