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Add Langchain external search tool examples for PraisonAI agents #407

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Mar 10, 2025
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Add Langchain external search tool examples for PraisonAI agents #407

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18 changes: 18 additions & 0 deletions examples/tools/langchain/brave-search.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
# pip install langchain-community
# export BRAVE_SEARCH_API=your_api_key_here
# export OPENAI_API_KEY=your_api_key_here

from praisonaiagents import Agent, PraisonAIAgents
from langchain_community.tools import BraveSearch
import os

def search_brave(query: str):
"""Searches using BraveSearch and returns results."""
api_key = os.environ['BRAVE_SEARCH_API']
tool = BraveSearch.from_api_key(api_key=api_key, search_kwargs={"count": 3})
return tool.run(query)
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high

Consider adding error handling to check if the BRAVE_SEARCH_API environment variable is set. If it's not set, the program will crash. You can use os.getenv with a default value or raise an exception with a helpful message.

Suggested change
api_key = os.environ['BRAVE_SEARCH_API']
tool = BraveSearch.from_api_key(api_key=api_key, search_kwargs={"count": 3})
return tool.run(query)
api_key = os.getenv('BRAVE_SEARCH_API')
if not api_key:
raise ValueError("BRAVE_SEARCH_API environment variable not set.")
tool = BraveSearch.from_api_key(api_key=api_key, search_kwargs={"count": 3})


data_agent = Agent(instructions="Search about AI job trends in 2025", tools=[search_brave])
editor_agent = Agent(instructions="Write a blog article")
agents = PraisonAIAgents(agents=[data_agent, editor_agent])
agents.start()
18 changes: 18 additions & 0 deletions examples/tools/langchain/google-trends.py
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# pip install langchain-community google-search-results
# export SERPAPI_API_KEY=your_api_key_here
# export OPENAI_API_KEY=your_api_key_here
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medium

It's good to include the installation and environment variable setup instructions, but it's missing instructions on how to obtain the SERPAPI_API_KEY.

Suggested change
# pip install langchain-community google-search-results
# export SERPAPI_API_KEY=your_api_key_here
# export OPENAI_API_KEY=your_api_key_here
# pip install langchain-community google-search-results
# export SERPAPI_API_KEY=your_api_key_here # Get your API key from https://serpapi.com/
# export OPENAI_API_KEY=your_api_key_here


from langchain_community.utilities.google_trends import GoogleTrendsAPIWrapper
from praisonaiagents import Agent, PraisonAIAgents

research_agent = Agent(
instructions="Research trending topics related to AI",
tools=[GoogleTrendsAPIWrapper]
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medium

For consistency with the other examples (brave-search.py and serp-api.py), consider wrapping GoogleTrendsAPIWrapper in a function.

Suggested change
research_agent = Agent(
instructions="Research trending topics related to AI",
tools=[GoogleTrendsAPIWrapper]
def google_trends_search(query: str):
"""Searches Google Trends and returns results."""
tool = GoogleTrendsAPIWrapper()
return tool.run(query)
research_agent = Agent(
instructions="Research trending topics related to AI",
tools=[google_trends_search]
)

)

summarise_agent = Agent(
instructions="Summarise findings from the research agent",
)

agents = PraisonAIAgents(agents=[research_agent, summarise_agent])
agents.start()
12 changes: 12 additions & 0 deletions examples/tools/langchain/serp-api.py
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# pip install langchain-community google-search-results
# export SERPAPI_API_KEY=your_api_key_here
# export OPENAI_API_KEY=your_api_key_here

from praisonaiagents import Agent, PraisonAIAgents
from langchain_community.utilities import SerpAPIWrapper

data_agent = Agent(instructions="Search about AI job trends in 2025", tools=[SerpAPIWrapper])
editor_agent = Agent(instructions="Write a blog article")

agents = PraisonAIAgents(agents=[data_agent, editor_agent])
agents.start()
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