A state-of-the-art multi-agent travel planning system built with LangGraph, Google Gemini Flash-2.0, and DuckDuckGo Search. The system offers three different planning approaches, from traditional single-agent to cutting-edge multi-agent collaboration using modern industry frameworks.
Choose from three different planning experiences:
- Traditional single AI agent approach
- Direct planning methodology
- Proven reliability and efficiency
- 6 specialized AI agents working together
- Custom multi-agent framework
- Enhanced recommendations through collaboration
- Google Gemini Flash-2.0 powered agents
- DuckDuckGo real-time search integration
- LangGraph workflow orchestration
- State-of-the-art multi-agent collaboration
- LangGraph StateGraph: Workflow orchestration and state management
- Google Gemini Flash-2.0: Advanced AI reasoning and natural language processing
- DuckDuckGo Search: Real-time information retrieval (no API key needed)
- Pydantic: Type safety and data validation
- Custom Agent Protocols: Specialized communication between agents
| Agent | Role | Capabilities |
|---|---|---|
| Coordinator | Workflow orchestration & decision synthesis | Master planning, task delegation, consensus building |
| Travel Advisor | Destination expertise with live search | Attraction research, destination insights, cultural guidance |
| Weather Analyst | Weather intelligence with current data | Weather forecasting, climate analysis, packing advice |
| Budget Optimizer | Cost analysis with real-time pricing | Budget planning, cost optimization, savings strategies |
| Local Expert | Insider knowledge with local info | Local tips, hidden gems, cultural etiquette |
| Itinerary Planner | Schedule optimization & logistics | Day-by-day planning, route optimization, timing |
- ✅ Real-time Search Integration: Live data from DuckDuckGo
- ✅ State Management: Persistent conversation state across agents
- ✅ Tool-Augmented Agents: Each agent has specialized search tools
- ✅ Collaborative Decision Making: Agents work together to create optimal plans
- ✅ Workflow Orchestration: LangGraph manages complex agent interactions
- ✅ Error Handling: Robust error recovery and fallback mechanisms
- Destination Information: General destination research
- Weather Intelligence: Current and forecasted weather data
- Attraction Discovery: Top attractions and activities
- Hotel Research: Accommodation options and pricing
- Restaurant Finder: Dining recommendations and reviews
- Local Insights: Cultural tips and insider knowledge
- Budget Analysis: Cost estimates and budget planning
# Python 3.8+
pip install -r requirements.txt- Get Gemini API Key: Visit Google AI Studio
- Configure Environment: Add your API key to
.envfileGEMINI_API_KEY=your_actual_api_key_here
- Verify Installation: Run the test script
python test_langgraph_system.py
python main.py
# Select option 3 for LangGraph (Recommended)
# Select option 2 for Legacy Multi-Agent
# Select option 1 for Single-Agentpython langgraph_main.pypython test_langgraph_system.pypython langgraph_main.py
# Select option 1 for Tokyo demonstrationpython langgraph_main.py
# Select option 2 for custom trip planningpython test_langgraph_system.py
# Tests all components without API calls# Required for LangGraph System
GEMINI_API_KEY=your_gemini_api_key
# Optional (for legacy systems)
OPENWEATHER_API_KEY=your_weather_api_key
GOOGLE_PLACES_API_KEY=your_places_api_key
EXCHANGERATE_API_KEY=your_exchange_rate_api_keyclass LangGraphConfig:
GEMINI_MODEL = "gemini-2.0-flash"
TEMPERATURE = 0.7
MAX_TOKENS = 4000
TOP_P = 0.9For enhanced legacy functionality, obtain free API keys:
-
Google Gemini API (Required for LangGraph system)
- Get key: https://makersuite.google.com/app/apikey
- Add to .env:
GEMINI_API_KEY=your_key
-
OpenWeather API (Legacy weather data)
- Get key: https://openweathermap.org/api
- Add to .env:
OPENWEATHER_API_KEY=your_key
-
Google Places API (Legacy attractions/hotels)
- Get key: Google Cloud Console
- Add to .env:
GOOGLE_PLACES_API_KEY=your_key
-
Exchange Rate API (Legacy currency conversion)
- Get key: https://exchangerate-api.com/
- Add to .env:
EXCHANGERATE_API_KEY=your_key
Note: The LangGraph system uses DuckDuckGo search (no API key needed) and works independently of legacy APIs.
🌍 AI Travel Agent & Expense Planner
====================================
Enter destination: London
Start date: 2025-12-25
End date: 2025-12-30
Budget range: Mid-range
Currency: CAD
Group size: 2
Interests: museums, food, culture
→ Generates complete 5-day London itinerary with:
• Weather forecasts
• Museum and restaurant recommendations
• Hotel options
• Daily cost breakdowns
• Currency-converted expenses
================================================================================
LANGGRAPH MULTI-AGENT AI TRAVEL PLANNING REPORT
================================================================================
Generated: 2025-06-20 12:58:25
System: LangGraph Framework with Google Gemini & DuckDuckGo
TRIP OVERVIEW:
----------------------------------------
Destination: Delhi
Duration: 3 days
Group Size: 3 people
Budget Range: mid-range
Interests:
SYSTEM PERFORMANCE:
----------------------------------------
Planning Method: LangGraph Multi-Agent Collaboration
Total Iterations: 7
Agents Involved: 5
AGENT CONTRIBUTIONS:
----------------------------------------
TRAVEL ADVISOR:
Status: completed
Timestamp: 2025-06-20T12:57:24.431678
Response: _agent: Okay, I can help you plan a 3-day trip to Delhi for 3 people, with a mid-range budget, sometime between July 21st and July 30th, 2025. Since you haven't specified any particular interests, I'll create a well-rounded itinerary covering historical sites, cultural experiences, and local flavors. Here's a possible plan:
**General Advice & Considerations:**
* **Best Time to Visit:** While your travel dates are in July, keep in mind that Delhi experiences its monsoon season around that time. Expect high humidity and occasional heavy rainfall. Pack accordingly (light, quick-drying clothes, umbrella/raincoat).
* **Transportation:** Delhi has a well-developed metro system which is efficient and cost-effective for getting around. Auto-rickshaws and taxis (Ola/Uber) are also readily available. Negotiate fares with auto-rickshaws beforehand.
* **Accommodation:** I'll suggest areas with a range of mid-range hotel options.
* **Food:** Delhi is a food lover's paradise! Be adventurous and try local street food, but ensure hygiene. Stick to reputable vendors and bottled water.
* **Safety:** Be aware of your surroundings, especially in crowded areas. Keep valuables secure.
**Top Attractions and Must-See Places:**
* **Historical Monuments:** Red Fort, Humayun's Tomb, Qutub Minar, India Gate
* **Religious Sites:** Lotus Temple, Akshardham Temple, Jama Masjid
* **Museums:** National Museum, National Rail Museum
* **Gardens:** Lodhi Garden, Garden of Five Senses
* **Markets:** Chandni Chowk, Dilli Haat, Khan Market
**Cultural Insights and Etiquette Tips:**
* **Dress Code:** Dress modestly, especially when visiting religious sites. Shoulders and knees should be covered.
* **Greetings:** "Namaste" is a respectful greeting.
* **Photography:** Ask for permission before taking photos of people, especially women.
* **Shoes:** Remove shoes before entering temples and mosques.
* **Tipping:** Tipping is customary in restaurants and for services.
* **Bargaining:** Bargaining is common in markets.
**Best Areas to Stay and Explore (Mid-Range Budget):**
* **Connaught Place (CP):** Central location, good connectivity, lots of restaurants and shopping.
* **Karol Bagh:** More budget-friendly than CP, bustling market area.
* **South Delhi (Hauz Khas, Green Park):** Quieter, more residential, with trendy cafes and boutiques.
* **Paharganj:** Very budget-friendly, close to the New Delhi Railway Station, but can be crowded and overwhelming.
**Possible 3-Day Itinerary:**
**Day 1: Old Delhi & Central Delhi**
* **Morning:** Explore **Old Delhi**. Take a rickshaw ride through **Chandni Chowk**, visit **Jama Masjid** (one of India's largest mosques), and sample street food (parathe, jalebi).
* **Afternoon:** Visit the **Red Fort**, a UNESCO World Heritage Site.
* **Evening:** Stroll through **Connaught Place**, have dinner at a restaurant of your choice.
**Day 2: New Delhi & Historical Sites**
* **Morning:** Visit **Humayun's Tomb**, a precursor to the Taj Mahal.
* **Afternoon:** Explore **Qutub Minar**, another UNESCO World Heritage Site.
* **Late Afternoon:** Drive past **India Gate** and **Presidential Palace**.
* **Evening:** Visit **Dilli Haat** (an open-air crafts bazaar) for shopping and cultural performances. Have dinner there.
**Day 3: Temples & Gardens**
* **Morning:** Visit **Lotus Temple**, a Baháʼí House of Worship known for its distinctive lotus-like shape.
* **Afternoon:** Explore **Akshardham Temple**, a sprawling complex dedicated to Swaminarayan. (Note: Allow ample time for security checks).
* **Evening:** Relax in **Lodhi Garden**, a historical garden with tombs and monuments. Have a farewell dinner at a restaurant in Hauz Khas Village.
**Activity Recommendations Based on Interests (Since None Were Specified):**
* **Food Tour:** If you're foodies, consider a guided food tour of Delhi.
* **Cooking Class:** Learn to cook authentic Indian dishes.
* **Yoga/Meditation:** Find a yoga class or meditation session for relaxation.
* **Shopping:** Explore different markets for souvenirs and handicrafts.
* **Sufi Music:** Experience a Sufi music performance at Nizamuddin Dargah (Thursday evenings are particularly popular).
**Mid-Range Budget Considerations:**
* **Accommodation:** Expect to pay around INR 3,000-6,000 per night for a decent mid-range hotel room for three people.
* **Food:** Meals can range from INR 300-1,000 per person per meal, depending on the restaurant.
* **Transportation:** Metro is very affordable. Budget around INR 500-1000 per day for taxis/auto-rickshaws, depending on usage.
* **Entrance Fees:** Monument entrance fees can add up. Factor in around INR 1,000-2,000 per person for all the sites.
This is a flexible itinerary that can be adjusted to your preferences. Once you provide more specific interests, I can tailor the plan further. Let me know if you have any questions!
WEATHER ANALYST:
Status: completed
Timestamp: 2025-06-20T12:57:26.070786
Response: Okay, thanks for the detailed itinerary. To make it weather-intelligent and provide the best recommendations, I need to understand the expected weather conditions during your travel dates (July 21st - July 30th, 2025) in Delhi.
NEED_SEARCH: average weather conditions in Delhi between July 21 and July 30
BUDGET OPTIMIZER:
Status: completed
Timestamp: 2025-06-20T12:57:36.309040
Response: Okay, here's a budget optimization plan for a 3-day trip to Delhi for 3 people on a mid-range budget.
**Estimated Daily and Total Costs:**
* **Estimated Daily Cost (per person):** ₹3,000 - ₹5,000 (This is a broad range, and we'll refine it below)
* **Estimated Total Cost (for 3 people, 3 days):** ₹27,000 - ₹45,000
**Budget Breakdown by Category (for 3 people, 3 days - flexible based on your preferences):**
| Category | Percentage | Estimated Cost (Lower End - ₹27,000) | Estimated Cost (Higher End - ₹45,000) | Notes |
|---------------|------------|--------------------------------------|---------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Accommodation | 30% | ₹8,100 | ₹13,500 | Mid-range hotels or well-reviewed guesthouses/Airbnb. Aim for ₹900-₹1500 per room per night. |
| Food | 30% | ₹8,100 | ₹13,500 | Mix of street food, local restaurants, and a few nicer meals. Budget ₹900-₹1500 per person per day. |
| Activities | 20% | ₹5,400 | ₹9,000 | Entrance fees to monuments, guided tours, and other experiences. Prioritize must-see sites. |
| Transport | 10% | ₹2,700 | ₹4,500 | Metro, auto-rickshaws, and ride-sharing apps. The Delhi Metro is very efficient and affordable. |
| Miscellaneous | 10% | ₹2,700 | ₹4,500 | Souvenirs, tips, unexpected expenses. Always good to have a buffer. |
**Money-Saving Tips and Strategies:**
* **Accommodation:**
* **Travel during the shoulder season (spring or autumn):** You'll find better deals on accommodation and fewer crowds.
* **Consider guesthouses or homestays:** Often cheaper than hotels and offer a more authentic experience. Look for well-reviewed options on platforms like Booking.com or Airbnb. Negotiate the price if possible.
* **Book in advance:** Secure better rates, especially if traveling during peak season.
* **Food:**
* **Eat like a local:** Street food and local restaurants are much cheaper than tourist-oriented establishments. Be mindful of hygiene; choose vendors with high turnover and visible cleanliness.
* **Lunch thalis:** A great value for money, offering a variety of dishes at a fixed price.
* **Carry a reusable water bottle:** Refill it whenever possible to avoid buying bottled water.
* **Activities:**
* **Take advantage of free activities:** Many parks, gardens, and religious sites (like Bangla Sahib Gurudwara) are free to enter.
* **Consider a Delhi Tourism hop-on-hop-off bus:** A cost-effective way to see many of the major attractions. Check reviews before booking.
* **Group discounts:** Inquire about group discounts at monuments and museums.
* **Transport:**
* **Use the Delhi Metro extensively:** It's clean, efficient, and very affordable. Buy a tourist card for unlimited travel.
* **Negotiate auto-rickshaw fares:** Always agree on a price before getting in. Use ride-sharing apps like Uber or Ola for predictable pricing.
* **Avoid taxis for short distances:** They are generally more expensive than auto-rickshaws or ride-sharing.
* **General:**
* **Bargain respectfully:** Bargaining is common in markets and with auto-rickshaw drivers. Be polite and respectful.
* **Travel in the off-season or shoulder season:** You'll find better deals on flights and accommodation.
* **Use credit cards with no foreign transaction fees:** This can save you money on exchange rates.
* **Alert your bank:** Inform your bank of your travel dates to avoid having your cards blocked.
**Cost-Effective Alternatives for Expensive Activities:**
* **Instead of hiring a private car for sightseeing:** Use the Delhi Metro and auto-rickshaws.
* **Instead of eating at fancy restaurants every night:** Explore street food markets and local dhabas.
* **Instead of guided tours at every monument:** Read up on the history and significance of the sites beforehand and explore on your own. Consider hiring a local guide at one or two key sites.
* **Instead of buying expensive souvenirs:** Look for unique, locally made crafts in markets like Dilli Haat (though entrance fee applies, the variety and authenticity are worth it).
To give you even more specific recommendations, I need a little more information:
* **What are your "must-see" attractions in Delhi?**
* **What kind of food are you interested in trying?**
* **What is your preferred accommodation style (hotel, guesthouse, Airbnb)?**
Once I have this, I can refine the budget further and suggest specific places to visit and eat.
LOCAL EXPERT:
Status: completed
Timestamp: 2025-06-20T12:57:47.676662
Response: Great! Knowing your interests helps me tailor the recommendations. Here's a more specific plan for a 3-day trip to Delhi for 3 people, focusing on history, culture, and food, while optimizing for a mid-range budget:
**Refined Budget Breakdown (Based on Interests):**
Let's assume you're aiming for the lower end of the initial budget range (₹27,000 total for 3 people, 3 days). We can adjust the percentages slightly to prioritize activities related to history and culture.
| Category | Percentage | Estimated Cost (₹27,000 Total) | Notes |
|---------------|------------|-----------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| Accommodation | 30% | ₹8,100 | Focus on well-reviewed guesthouses or budget-friendly hotels in central locations like Paharganj (budget) or Karol Bagh (mid-range). |
| Food | 30% | ₹8,100 | Prioritize street food experiences and local restaurants. |
| Activities | 25% | ₹6,750 | Allocate more for entrance fees to historical sites and potentially a guided tour or two. |
| Transport | 10% | ₹2,700 | Metro and auto-rickshaws. |
| Miscellaneous | 5% | ₹1,350 | Buffer for unexpected expenses, small souvenirs. |
**Detailed Itinerary and Recommendations:**
**Day 1: Old Delhi Immersion**
* **Morning (Historical):**
* **Red Fort (Lal Qila):** Explore this UNESCO World Heritage Site. Allocate 2-3 hours. Entrance fee: ₹60 for Indians, ₹800 for foreigners.
* **Budget Tip:** Hire a government-approved guide at the entrance for a more enriching experience (negotiate the price beforehand).
* **Lunch (Food):**
* **Karim's (near Jama Masjid):** Iconic Mughlai restaurant. Try their kebabs, biryani, and nahari. (₹500-₹800 for 3 people)
* **Afternoon (Cultural/Spiritual):**
* **Jama Masjid:** One of India's largest mosques. Dress modestly (cover shoulders and knees). Entrance is free, but there's a small fee for photography.
* **Chandni Chowk:** Explore the bustling market. Sample street food like *parathe* (stuffed flatbreads) at Parathe Wali Gali, *jalebi* (sweet fried dough), and *lassi* (yogurt drink). Be mindful of hygiene.
* **Evening (Cultural):**
* **Sound and Light Show at Red Fort (optional):** Check timings and book tickets in advance (₹600-₹800 for 3 people).
* **Dinner:** Continue exploring street food in Chandni Chowk or find a local restaurant in the area.
**Day 2: New Delhi Exploration**
* **Morning (Historical):**
* **Humayun's Tomb:** A precursor to the Taj Mahal. Beautiful Mughal architecture. Entrance fee: ₹40 for Indians, ₹600 for foreigners.
* **Budget Tip:** Take the metro to JLN Stadium station and then an auto-rickshaw to the tomb (₹50-₹80).
* **Lunch (Food):**
* **Khan Market:** Upscale market with a variety of restaurants. Explore options like *Big Yellow Door* (casual cafe) or *SodaBottleOpenerWala* (Parsi cuisine). (₹800-₹1200 for 3 people)
* **Afternoon (Historical/Cultural):**
* **Qutub Minar:** Another UNESCO World Heritage Site. A towering minaret with intricate carvings. Entrance fee: ₹40 for Indians, ₹600 for foreigners.
* **Mehrauli Archaeological Park (adjacent to Qutub Minar):** Explore historical ruins and tombs (free entry).
* **Evening (Spiritual/Cultural):**
* **Lotus Temple:** A Baháʼí House of Worship. Striking architectural design. Free entry.
* **Dinner:** Explore Hauz Khas Village for a variety of dining options (from budget to mid-range).
**Day 3: Museums and Markets**
* **Morning (Cultural/Historical):**
* **National Museum:** Extensive collection of Indian art, artifacts, and historical exhibits. Entrance fee: ₹20 for Indians, ₹650 for foreigners.
* **Budget Tip:** Check for student discounts if applicable.
* **Lunch (Food):**
* **Connaught Place (CP):** Central business district with numerous restaurants. Explore options for North Indian, South Indian, or international cuisine. (₹700-₹1000 for 3 people)
* **Afternoon (Shopping/Cultural):**
* **Dilli Haat (INA):** A crafts village showcasing handicrafts and cuisine from different states of India. Entrance fee: ₹30.
* **Janpath Market (near CP):** Bargain for clothes, jewelry, and souvenirs.
* **Evening (Relaxation/Departure):**
* **India Gate:** Visit this iconic war memorial. Enjoy a walk around the area.
* **Dinner:** Depending on your departure time, have a final meal at a restaurant near your hotel or the airport.
**Local Dining Recommendations (Beyond the Itinerary):**
* **Street Food:**
* **Rajinder Da Dhaba (Safdarjung Enclave):** Famous for its non-vegetarian kebabs and curries (budget-friendly).
* **Dolma Aunty Momos (Lajpat Nagar):** Delicious and affordable momos (dumplings).
* **Local Restaurants:**
* **Andhra Bhavan (near India Gate):** Authentic Andhra cuisine (South Indian) at very reasonable prices.
* **Bukhara (ITC Maurya):** High-end, but iconic for its Dal Bukhara and tandoori dishes (splurge).
* **Gulati (Pandara Road Market):** Popular for North Indian cuisine, especially butter chicken and dal makhani.
**Cultural Etiquette and Customs:**
* **Dress Modestly:** Especially when visiting religious sites. Cover shoulders and knees.
* **Remove Shoes:** Before entering temples, mosques, and some homes.
* **Use Your Right Hand:** For eating and giving/receiving things.
* **Bargain Respectfully:** It's expected in markets, but do so politely.
* **Avoid Public Displays of Affection:** While attitudes are changing, it's still generally considered inappropriate.
* **Be Mindful of Personal Space:** Crowded areas are common.
* **Learn a Few Basic Hindi Phrases:** "Namaste" (hello), "Shukriya" (thank you), "Kitna hai?" (how much?).
**Insider Tips:**
* **Stay Hydrated:** Delhi can get very hot and humid, especially in the summer.
* **Be Aware of Scams:** Be cautious of touts and unsolicited offers.
* **Download Ride-Sharing Apps:** Uber and Ola are widely used and convenient.
* **Use Google Maps:** For navigation and public transport directions.
* **Carry Small Denomination Bills:** For auto-rickshaws and street vendors.
* **Beware of Pickpockets:** Be vigilant in crowded areas.
* **Learn to Say "No" Firmly:** To avoid being pressured into buying things you don't want.
* **Check the Weather Forecast:** Plan your activities accordingly.
* **Be Prepared for Traffic:** Delhi traffic can be chaotic.
This itinerary is a suggestion, feel free to customize it based on your preferences and energy levels. Enjoy your trip to Delhi!
ITINERARY PLANNER:
Status: completed
Timestamp: 2025-06-20T12:57:55.320014
Response: This is an excellent refined itinerary, incorporating budget considerations, specific restaurant recommendations, cultural tips, and practical advice. Here are a few minor suggestions to further enhance its usefulness:
**1. Transportation Specifics & Optimization:**
* **Day 1:**
* "Take the metro to Chawri Bazaar station" before heading to Jama Masjid and Chandni Chowk. This is the most efficient way to reach that area. Specify that auto-rickshaws are readily available from the metro station if they prefer not to walk.
* Add: "Consider taking a cycle rickshaw tour of Chandni Chowk for a unique experience (negotiate the price beforehand)." This provides a specific alternative activity within the area.
* **Day 2:**
* Specify which metro station is closest to Khan Market (Khan Market station).
* Add a note about the distance between Qutub Minar and Mehrauli Archaeological Park (walking distance vs. auto-rickshaw).
* **Day 3:**
* Specify the metro station for Dilli Haat (INA station).
* Mention that Janpath Market is walking distance from Connaught Place.
**2. Timing Considerations:**
* **General:** Emphasize the importance of starting early, especially during peak season or hot weather, to avoid crowds and heat exhaustion. Suggest starting activities around 9:00 AM each day.
* **Red Fort (Day 1):** Suggest arriving right at opening time (usually 9:30 AM) to avoid the biggest crowds.
* **Lotus Temple (Day 2):** Mention that there can be long queues, especially on weekends. Suggest visiting during off-peak hours (e.g., late afternoon).
**3. Alternative Activities (Contingency Planning):**
* Have a backup plan for each day in case of unexpected closures (e.g., strikes, holidays). Examples:
* **Day 1 (Alternative):** If Red Fort is unexpectedly closed, visit the National Gandhi Museum near Raj Ghat.
* **Day 2 (Alternative):** If Humayun's Tomb is too crowded, visit Safdarjung's Tomb, another Mughal-era tomb with similar architecture but fewer visitors.
* **Day 3 (Alternative):** If Dilli Haat is not appealing, consider visiting the State Emporia Complex on Baba Kharak Singh Marg for fixed-price handicrafts.
**4. Food Considerations:**
* **Dietary Restrictions:** Include a brief sentence about how Delhi caters to various dietary restrictions (vegetarian, vegan, gluten-free) and how to communicate those needs to restaurants.
* **Water:** Reinforce the importance of drinking bottled water or filtered water only.
**5. Safety and Health:**
* **Mosquito Repellent:** Recommend using mosquito repellent, especially in the evenings.
* **Air Pollution:** Briefly mention the air quality in Delhi and suggest checking the Air Quality Index (AQI) and taking precautions if necessary (e.g., wearing a mask on particularly bad days).
**Revised Snippets Incorporating Suggestions:**
* **Day 1: Old Delhi Immersion**
* **Morning:** "...Take the metro to *Chawri Bazaar* station. From the station, auto-rickshaws are readily available if you prefer not to walk to Jama Masjid and Chandni Chowk. Consider taking a cycle rickshaw tour of Chandni Chowk for a unique experience (negotiate the price beforehand)."
* **Day 2: New Delhi Exploration**
* **Morning:** "...Take the metro to *JLN Stadium* station and then an auto-rickshaw to the tomb (₹50-₹80)."
* **Lunch:** "...Khan Market (metro station: *Khan Market*)."
* **Afternoon:** "...Mehrauli Archaeological Park (adjacent to Qutub Minar): Explore historical ruins and tombs (free entry). The park is within walking distance of Qutub Minar, or a short auto-rickshaw ride."
* **Alternative:** If Humayun's Tomb is too crowded, visit Safdarjung's Tomb, another Mughal-era tomb with similar architecture but fewer visitors.
* **Day 3: Museums and Markets**
* **Afternoon:** "...Dilli Haat (INA) (metro station: *INA*)...Janpath Market (near CP): Bargain for clothes, jewelry, and souvenirs. Janpath Market is within walking distance from Connaught Place."
* **General Timing:** "To avoid the biggest crowds and the heat, aim to start your sightseeing around 9:00 AM each day."
* **Food Considerations:** "Delhi caters well to various dietary restrictions (vegetarian, vegan, gluten-free). Don't hesitate to communicate your needs to restaurant staff. Always drink bottled or filtered water."
* **Safety and Health:** "Remember to use mosquito repellent, especially in the evenings. Check the Air Quality Index (AQI) daily and consider wearing a mask on days with high pollution levels."
By incorporating these minor adjustments, you'll make the itinerary even more practical, informative, and user-friendly. Great work!
================================================================================
End of LangGraph Multi-Agent Travel Planning Report
================================================================================
📁 ai_travel_agent/
├── main.py # Multi-system entry point
├── langgraph_main.py # LangGraph system entry
├── test_langgraph_system.py # Comprehensive testing
├── agents/ # Agent implementations
│ ├── langgraph_agents.py # LangGraph agent system
│ ├── multi_agent_orchestrator.py # Legacy multi-agent
│ └── travel_agents.py # Individual agent classes
├── config/ # Configuration management
│ ├── langgraph_config.py # LangGraph configuration
│ ├── api_config.py # Legacy API settings
│ └── app_config.py # Application settings
├── tools/ # LangGraph tools
│ └── travel_tools.py # 7 DuckDuckGo search tools
├── data/ # Data models
│ └── models.py # Data classes
├── modules/ # Legacy business logic
│ ├── user_input.py # Input handling & validation
│ ├── weather_service.py # Weather data integration
│ ├── attraction_finder.py # Attraction discovery
│ ├── hotel_estimator.py # Accommodation estimation
│ ├── currency_converter.py # Currency conversion
│ ├── expense_calculator.py # Cost calculations
│ ├── itinerary_planner.py # Day-by-day planning
│ └── trip_summary.py # Report generation
└── utils/ # Utility functions
└── helpers.py # Common helper functions
| Feature | Single-Agent | Legacy Multi-Agent | LangGraph System |
|---|---|---|---|
| Framework | Custom | Custom | LangGraph + LangChain |
| LLM | Mock/Static | Mock/Static | Google Gemini Flash-2.0 |
| Search | Static Data | Static Data | DuckDuckGo Real-time |
| State Management | None | Basic | Advanced (StateGraph) |
| Tool Integration | Limited | Limited | Full Tool Ecosystem |
| Collaboration | None | Basic | Advanced Workflows |
| Scalability | Low | Medium | High |
| Maintainability | Low | Medium | High |
requests>=2.31.0 # HTTP requests for API calls
python-dotenv>=1.0.0 # Environment variable management
- OpenWeather API: Weather forecasts
- Google Places API: Attractions and hotels
- Exchange Rate API: Currency conversion
# LangGraph system validation (no API key needed)
python test_langgraph_system.py
# Legacy system tests
python -m pytest tests/ (if tests directory exists)The test_langgraph_system.py script validates:
- All LangGraph components
- Tool integrations
- Configuration management
- Import compatibility
- System readiness
-
API Quota Exceeded
Error: 429 You exceeded your current quota Solution: Wait for quota reset or upgrade API plan -
Import Errors
pip install -r requirements.txt
-
Configuration Issues
python test_langgraph_system.py
-
Missing API Key
Error: GEMINI_API_KEY not found Solution: Add your API key to .env file
export DEBUG=true
python langgraph_main.py- 5-day weather forecasts
- Temperature, conditions, humidity
- Weather-based activity recommendations
- Packing suggestions
- Museums and cultural sites
- Restaurants by cuisine type
- Activities based on interests
- Rating and cost information
- Budget-appropriate hotel recommendations
- Price per night calculations
- Amenity listings
- Group accommodation options
- Real-time exchange rates
- 10+ international currencies
- Automatic cost conversion
- Rate caching for performance
- Day-by-day schedules
- Weather-optimized activity ordering
- Transportation suggestions
- Timing recommendations
- Detailed cost breakdowns
- Budget vs actual tracking
- Group cost calculations
- Cost-saving recommendations
- Follow object-oriented design principles
- Maintain modular architecture
- Include comprehensive error handling
- Add unit tests for new features
# Install development dependencies
pip install -r requirements.txt
# Run validation
python validate.py
# Test specific modules
python -m pytest tests/test_attraction.pyThis project is for educational purposes as part of the AI Agents assignment.
For issues or questions:
- Check the validation script:
python validate.py - Review error messages and logs
- Verify API key configuration (if using external APIs)
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