docs/tutorials/umshini/deception_langchain.py

"""Simple example of running the Umshini deception environment locally using LangChain agents. This can be used to test agents before participating in a tournament."""
from langchain.schema import SystemMessage

from chatarena.environments.umshini.agents import SimpleDeceptionDefender, SimpleDeceptionAttacker, \
    PresidentDeceptionAttacker, DeceptionMultiRoleAgent
from chatarena.environments.umshini import PettingZooCompatibilityV0

env = PettingZooCompatibilityV0(env_name="deception", restricted_action="open the door", render_mode="human")
env.reset()

# Note: these agents are only intended to be used as starting examples, and tend to suffer from hallucination if the game continues for many rounds

# However, unlike the ChatArena agents, they can correct handle swapping of roles deterministically using string parsing
langchain_agents = {env.possible_agents[0]: DeceptionMultiRoleAgent(PresidentDeceptionAttacker,
                                                                    SimpleDeceptionDefender),
                    env.possible_agents[1]: DeceptionMultiRoleAgent(SimpleDeceptionAttacker, SimpleDeceptionDefender)}

for agent in env.agent_iter():
    observation, reward, termination, truncation, info = env.last()

    if termination or truncation:
        break

    # Optional: Use extra information encoded in info dict
    messages = info.get("new_messages")
    player_name = info.get("player_name")
    restricted_action = info.get("restricted_action")

    try:
        response = langchain_agents[agent].get_response([SystemMessage(content=observation)], restricted_action, player_name)
    except Exception as e:
        response = str(e).removeprefix("Could not parse LLM output: `").removesuffix("`")
    env.step(response)