How to create an AI agent that can fetch and analyze Yelp reviews

pip install exfunc langgraph langchain langchain-openai

export EXFUNC_API_KEY=...
export OPENAI_API_KEY=...

from exfunc import Exfunc
from langchain_openai import ChatOpenAI

exfunc = Exfunc()
llm = ChatOpenAI(model="gpt-4o-mini")

from langchain_core.tools import tool

@tool
def search_businesses(query: str, location: str) -> list:
    """Search businesses on Yelp."""
    search_businesses_result = exfunc.yelp.search_businesses(request={
        "query": query,
        "location": location,
    })
    return search_businesses_result.businesses

@tool
def get_business_reviews(business_id: str) -> dict:
    """Get a list of reviews on Yelp for a given business ID."""
    get_business_reviews_result = exfunc.yelp.get_business_reviews(request={
        "business_id": business_id,
    })
    return get_business_reviews_result.reviews


tools = [search_businesses, get_business_reviews]

from langgraph.prebuilt import create_react_agent

agent = create_react_agent(llm, tools)

def print_stream(stream):
    for s in stream:
        message = s["messages"][-1]
        if isinstance(message, tuple):
            print(message)
        else:
            message.pretty_print()

query = "analyze reviews of yin du wonton noodle soup in SF"
inputs = {"messages": [("user", query)]}
print_stream(agent.stream(inputs, stream_mode="values"))

================================ Human Message =================================
analyze reviews of yin du wonton noodle soup in SF
================================== Ai Message ==================================
Tool Calls:
  search_businesses (call_l4...)
 Call ID: call_l4...
  Args:
    query: Yin Du Wonton Noodle Soup
    location: San Francisco
================================= Tool Message =================================
Name: search_businesses

**Redacted**
================================== Ai Message ==================================
Tool Calls:
  get_business_reviews (call_XK...)
 Call ID: call_XK...
  Args:
    business_id: TS...
================================= Tool Message =================================
Name: get_business_reviews

**Redacted**
================================== Ai Message ==================================
**Yin Du Wonton Noodle Soup** in San Francisco has garnered a mixture of reviews, reflecting both its authentic character and some areas of concern. Here’s an overview of the insights based on customer feedback:

### Overall Rating
- **Rating:** 3.7/5 based on 456 reviews

### Positive Aspects
1. **Authenticity:** Many customers appreciate the authentic feel of the restaurant, often commenting on its classic Chinatown vibe, including cash-only transactions and communal seating.
2. **Quality of Food:** The food, particularly the wonton and noodle soups, receive praise for being homey and comforting. Dishes like the Wonton Shrimp & Pork Soup and Stewed Beef Rice Noodle Soup are frequently mentioned for their rich flavors and hearty portions.
3. **Value for Money:** Several reviews highlight the value, noting that the prices are reasonable for the amount and quality of food provided, especially in a city like San Francisco.
4. **Quick Service:** Despite the sometimes chaotic atmosphere, many customers note that service is quick, with meals arriving promptly even during busy hours.

### Areas for Improvement
1. **Service Issues:** Some reviewers mention that the service can be disorganized, with staff being too busy to attend to customers promptly. This is a common theme, suggesting that while the food is good, the customer service experience may not be as high a priority.
2. **Ambience:** The restaurant's ambiance is described as simple and no-frills, which may not appeal to everyone. A few reviews indicate that cleanliness could be improved.
3. **Inconsistent Experiences:** While many reviews are positive, there are mentions of inconsistency in food quality, with some dishes being deemed average or lacking standout flavors.

### Notable Reviews
- **Redacted (4 stars):** Enjoyed the "home-cooked" flavor of the Wonton Shrimp & Pork Soup but noted the chaotic service.
- **Redacted (5 stars):** Described the egg noodles as "bouncing" and highlighted the deliciousness of the beef stew and other menu items.
- **Redacted (4 stars):** Loved the rich, flavorful broth of the stewed beef rice noodle soup, although noted that one wonton was missing filling.
- **Redacted (3 stars):** Found the food decent but nothing standout, emphasizing the cash-only policy and average cleanliness.
- **Redacted (4 stars):** Praised the beef brisket for its tenderness and depth of flavor but noted some issues with wonton fillings.

### Conclusion
Yin Du Wonton Noodle Soup is a beloved local spot known for its authentic flavors and quick service, despite some service-related complaints. It’s a great choice for those looking to enjoy hearty wonton noodles in a classic Chinatown setting, but diners should be prepared for a casual dining experience with potentially long wait times during peak hours.