main.py

import asyncio
import os
import streamlit as st
from textwrap import dedent

from mcp_agent.app import MCPApp
from mcp_agent.agents.agent import Agent
from mcp_agent.workflows.llm.augmented_llm_openai import OpenAIAugmentedLLM
from mcp_agent.workflows.llm.augmented_llm import RequestParams

# Page config
st.set_page_config(page_title="Browser MCP Agent", page_icon="🌐", layout="wide")

# Title and description
st.markdown("<h1 class='main-header'>🌐 Browser MCP Agent</h1>", unsafe_allow_html=True)
st.markdown("Interact with a powerful web browsing agent that can navigate and interact with websites")

# Setup sidebar with example commands
with st.sidebar:
    st.markdown("### Example Commands")
    
    st.markdown("**Navigation**")
    st.markdown("- Go to wikipedia.org/wiki/computer_vision")
    
    st.markdown("**Interactions**")
    st.markdown("- Click on the link to object detection and take a screenshot")
    st.markdown("- Scroll down to view more content")
    
    st.markdown("**Multi-step Tasks**")
    st.markdown("- Navigate to wikipedia.org/wiki/computer_vision, scroll down, and report details")
    st.markdown("- Scroll down and summarize the wikipedia page")
    
    st.markdown("---")
    st.caption("Note: The agent uses Puppeteer to control a real browser.")

# Query input
query = st.text_area("Your Command", 
                   placeholder="Ask the agent to navigate to websites and interact with them")

# Initialize app and agent
if 'initialized' not in st.session_state:
    st.session_state.initialized = False
    st.session_state.mcp_app = MCPApp(name="streamlit_mcp_agent")
    st.session_state.mcp_context = None
    st.session_state.mcp_agent_app = None
    st.session_state.browser_agent = None
    st.session_state.llm = None
    st.session_state.loop = asyncio.new_event_loop()
    asyncio.set_event_loop(st.session_state.loop)

# Setup function that runs only once
async def setup_agent():
    if not st.session_state.initialized:
        try:
            # Create context manager and store it in session state
            st.session_state.mcp_context = st.session_state.mcp_app.run()
            st.session_state.mcp_agent_app = await st.session_state.mcp_context.__aenter__()
            
            # Create and initialize agent
            st.session_state.browser_agent = Agent(
                name="browser",
                instruction="""You are a helpful web browsing assistant that can interact with websites using puppeteer.
                    - Navigate to websites and perform browser actions (click, scroll, type)
                    - Extract information from web pages 
                    - Take screenshots of page elements when useful
                    - Provide concise summaries of web content using markdown
                    - Follow multi-step browsing sequences to complete tasks
                    
                    When navigating, start with "www.lastmileai.dev" unless instructed otherwise.""",
                server_names=["puppeteer"],
            )
            
            # Initialize agent and attach LLM
            await st.session_state.browser_agent.initialize()
            st.session_state.llm = await st.session_state.browser_agent.attach_llm(OpenAIAugmentedLLM)
            
            # List tools once
            logger = st.session_state.mcp_agent_app.logger
            tools = await st.session_state.browser_agent.list_tools()
            logger.info("Tools available:", data=tools)
            
            # Mark as initialized
            st.session_state.initialized = True
        except Exception as e:
            return f"Error during initialization: {str(e)}"
    return None

# Main function to run agent
async def run_mcp_agent(message):
    if not os.getenv("OPENAI_API_KEY"):
        return "Error: OpenAI API key not provided"
    
    try:
        # Make sure agent is initialized
        error = await setup_agent()
        if error:
            return error
        
        # Generate response without recreating agents
        # Switch use_history to False to reduce the passed context
        result = await st.session_state.llm.generate_str(
            message=message, 
            request_params=RequestParams(use_history=True)
            )
        return result
    except Exception as e:
        return f"Error: {str(e)}"

# Run button
if st.button("🚀 Run Command", type="primary", use_container_width=True):
    with st.spinner("Processing your request..."):
        result = st.session_state.loop.run_until_complete(run_mcp_agent(query))
    
    # Display results
    st.markdown("### Response")
    st.markdown(result)

# Display help text for first-time users
if 'result' not in locals():
    st.markdown(
        """<div style='padding: 20px; background-color: #f0f2f6; border-radius: 10px;'>
        <h4>How to use this app:</h4>
        <ol>
            <li>Enter your OpenAI API key in your mcp_agent.secrets.yaml file</li>
            <li>Type a command for the agent to navigate and interact with websites</li>
            <li>Click 'Run Command' to see results</li>
        </ol>
        <p><strong>Capabilities:</strong></p>
        <ul>
            <li>Navigate to websites using Puppeteer</li>
            <li>Click on elements, scroll, and type text</li>
            <li>Take screenshots of specific elements</li>
            <li>Extract information from web pages</li>
            <li>Perform multi-step browsing tasks</li>
        </ul>
        </div>""", 
        unsafe_allow_html=True
    )

# Footer
st.markdown("---")
st.write("Built with Streamlit, Puppeteer, and MCP-Agent Framework ❤️")