class_docstr: Example one person world that talks to a provided agent (bot).
class_docstr_tok: ["Example","one","person","world","that","talks","to","a","provided","agent","(","bot",")","."]
code: def assign_roles(agents):
      agents[0].disp_id = "ChatbotAgent"
  
imports: from parlai.core.worlds import World
  from parlai.chat_service.services.messenger.worlds import OnboardWorld
  from parlai.core.agents import create_agent_from_shared
label_desc: Use image node_id 3 for calling the MessengerBotChatTaskWorld obj's underlying member method code with example usage: obj.assign_roles(agents) without return types