src/backend/base/langflow/initial_setup/starter_projects/complex_agent.py

from langflow.components.crewai.crewai import CrewAIAgentComponent
from langflow.components.crewai.hierarchical_crew import HierarchicalCrewComponent
from langflow.components.crewai.hierarchical_task import HierarchicalTaskComponent
from langflow.components.inputs import ChatInput
from langflow.components.models import OpenAIModelComponent
from langflow.components.outputs import ChatOutput
from langflow.components.prompts import PromptComponent
from langflow.components.tools import SearchAPIComponent, YfinanceToolComponent
from langflow.graph import Graph


def complex_agent_graph():
    llm = OpenAIModelComponent(model_name="gpt-4o-mini")
    manager_llm = OpenAIModelComponent(model_name="gpt-4o")
    search_api_tool = SearchAPIComponent()
    yahoo_search_tool = YfinanceToolComponent()
    dynamic_agent = CrewAIAgentComponent()
    chat_input = ChatInput()
    role_prompt = PromptComponent(_display_name="Role Prompt")
    role_prompt.set(
        template="""Define a Role that could execute or answer well the user's query.

User's query: {query}

Role should be two words max. Something like "Researcher" or "Software Developer".
"""
    )

    goal_prompt = PromptComponent(_display_name="Goal Prompt")
    goal_prompt.set(
        template="""Define the Goal of this Role, given the User's Query.
User's query: {query}

Role: {role}

The goal should be concise and specific.
Goal:
""",
        query=chat_input.message_response,
        role=role_prompt.build_prompt,
    )
    backstory_prompt = PromptComponent(_display_name="Backstory Prompt")
    backstory_prompt.set(
        template="""Define a Backstory of this Role and Goal, given the User's Query.
User's query: {query}

Role: {role}
Goal: {goal}

The backstory should be specific and well aligned with the rest of the information.
Backstory:""",
        query=chat_input.message_response,
        role=role_prompt.build_prompt,
        goal=goal_prompt.build_prompt,
    )
    dynamic_agent.set(
        tools=[search_api_tool.build_tool, yahoo_search_tool.build_tool],
        llm=llm.build_model,
        role=role_prompt.build_prompt,
        goal=goal_prompt.build_prompt,
        backstory=backstory_prompt.build_prompt,
    )

    response_prompt = PromptComponent()
    response_prompt.set(
        template="""User's query:
{query}

Respond to the user with as much as information as you can about the topic. Delete if needed.
If it is just a general query (e.g a greeting) you can respond them directly.""",
        query=chat_input.message_response,
    )
    manager_agent = CrewAIAgentComponent()
    manager_agent.set(
        llm=manager_llm.build_model,
        role="Manager",
        goal="You can answer general questions from the User and may call others for help if needed.",
        backstory="You are polite and helpful. You've always been a beacon of politeness.",
    )
    task = HierarchicalTaskComponent()
    task.set(
        task_description=response_prompt.build_prompt,
        expected_output="Succinct response that answers the User's query.",
    )
    crew_component = HierarchicalCrewComponent()
    crew_component.set(
        tasks=task.build_task, agents=[dynamic_agent.build_output], manager_agent=manager_agent.build_output
    )
    chat_output = ChatOutput()
    chat_output.set(input_value=crew_component.build_output)

    return Graph(
        start=chat_input,
        end=chat_output,
        flow_name="Sequential Tasks Agent",
        description="This Agent runs tasks in a predefined sequence.",
    )