class_docstr: OPT BB3 Agent.
class_docstr_tok: ["OPT","BB3","Agent","."]
code: def opening_token(self):
      return PROMPT.OPENING_PREFIX
  
imports: import copy
  import random
  from typing import List, Optional, Dict, Any, Union, Tuple
  from parlai.agents.rag.retrievers import Document
  from parlai.core.agents import Agent, create_agent
  from parlai.core.message import Message
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  import parlai.utils.logging
  from projects.bb3.agents.module import Module
  from projects.bb3.agents.r2c2_bb3_agent import BlenderBot3Agent
  from projects.bb3.agents.opt_api_agent import BB3OPTAgent
  from projects.bb3.agents.search_agent import SearchAgent
  from projects.bb3.agents.utils import Decision, APIUtils, is_opener, DisplayUtils, set_failed_reply
  import projects.bb3.prompts
label_desc: Use image node_id 8 for calling the BlenderBot3Agent obj's underlying member method code with example usage: obj.opening_token() and returns: PROMPT