Access Multiple Previous Steps Output

from agno.agent.agent import Agent
from agno.tools.duckduckgo import DuckDuckGoTools
from agno.tools.hackernews import HackerNewsTools
from agno.workflow.step import Step
from agno.workflow.types import StepInput, StepOutput
from agno.workflow.workflow import Workflow

# Define the research agents
hackernews_agent = Agent(
    name="HackerNews Researcher",
    instructions="You are a researcher specializing in finding the latest tech news and discussions from Hacker News. Focus on startup trends, programming topics, and tech industry insights.",
    tools=[HackerNewsTools()],
)

web_agent = Agent(
    name="Web Researcher",
    instructions="You are a comprehensive web researcher. Search across multiple sources including news sites, blogs, and official documentation to gather detailed information.",
    tools=[DuckDuckGoTools()],
)

reasoning_agent = Agent(
    name="Reasoning Agent",
    instructions="You are an expert analyst who creates comprehensive reports by analyzing and synthesizing information from multiple sources. Create well-structured, insightful reports.",
)

# Create the research steps
research_hackernews = Step(
    name="research_hackernews",
    agent=hackernews_agent,
    description="Research latest tech trends from Hacker News",
)

research_web = Step(
    name="research_web",
    agent=web_agent,
    description="Comprehensive web research on the topic",
)

# Custom function step that has access to ALL previous step outputs


def create_comprehensive_report(step_input: StepInput) -> StepOutput:
    """
    Custom function that creates a report using data from multiple previous steps.
    This function has access to ALL previous step outputs and the original workflow message.
    """

    # Access original workflow input
    original_topic = step_input.input or ""

    # Access specific step outputs by name
    hackernews_data = step_input.get_step_content("research_hackernews") or ""
    web_data = step_input.get_step_content("research_web") or ""

    # Or access ALL previous content
    _ = step_input.get_all_previous_content()

    # Create a comprehensive report combining all sources
    report = f"""
        # Comprehensive Research Report: {original_topic}

        ## Executive Summary
        Based on research from HackerNews and web sources, here's a comprehensive analysis of {original_topic}.

        ## HackerNews Insights
        {hackernews_data[:500]}...

        ## Web Research Findings
        {web_data[:500]}...
    """

    return StepOutput(
        step_name="comprehensive_report", content=report.strip(), success=True
    )


comprehensive_report_step = Step(
    name="comprehensive_report",
    executor=create_comprehensive_report,
    description="Create comprehensive report from all research sources",
)

# Final reasoning step using reasoning agent
reasoning_step = Step(
    name="final_reasoning",
    agent=reasoning_agent,
    description="Apply reasoning to create final insights and recommendations",
)

workflow = Workflow(
    name="Enhanced Research Workflow",
    description="Multi-source research with custom data flow and reasoning",
    steps=[
        research_hackernews,
        research_web,
        comprehensive_report_step,  # Has access to both previous steps
        reasoning_step,  # Gets the last step output (comprehensive report)
    ],
)

if __name__ == "__main__":
    workflow.print_response(
        "Latest developments in artificial intelligence and machine learning",
        stream=True,
        stream_events=True,
    )