def run_agent(user_input):
    intermediate_steps = []
    while True:
        result = agent_chain.invoke({
            "input": user_input,
            "intermediate_steps": intermediate_steps
        })
        if isinstance(result, AgentFinish):
            return result.log

        tool = {
            "get_web_results": get_web_results,
        }[result.tool]

        observation = tool.run(result.tool_input)
        intermediate_steps.append((result, observation))