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from typing import Dict, Any, List
from langgraph.graph import Graph, StateGraph
from langgraph.prebuilt import ToolNode
from pydantic import BaseModel, Field
from duckduckgo_search import DDGS
class CalculatorInput(BaseModel):
operation: str = Field(..., description="The operation to perform (add, subtract, multiply, divide)")
numbers: List[float] = Field(..., description="List of numbers to perform the operation on")
class CalculatorOutput(BaseModel):
result: float = Field(..., description="The result of the calculation")
operation: str = Field(..., description="The operation that was performed")
class CalculatorState(BaseModel):
input: CalculatorInput
output: CalculatorOutput = None
class SearchInput(BaseModel):
query: str = Field(..., description="The search query to look up")
max_results: int = Field(default=3, description="Maximum number of results to return")
class SearchResult(BaseModel):
title: str = Field(..., description="Title of the search result")
link: str = Field(..., description="URL of the search result")
snippet: str = Field(..., description="Brief description of the search result")
class SearchOutput(BaseModel):
results: List[SearchResult] = Field(..., description="List of search results")
query: str = Field(..., description="The original search query")
class SearchState(BaseModel):
input: SearchInput
output: SearchOutput = None
def create_calculator_tool() -> Graph:
"""Creates a calculator tool using LangGraph that can perform basic arithmetic operations."""
print("Creating calculator tool")
def calculator_function(state: CalculatorState) -> dict:
print("Calculator function called")
if len(state.input.numbers) < 2:
raise ValueError("At least two numbers are required for calculation")
result = state.input.numbers[0]
for num in state.input.numbers[1:]:
if state.input.operation == "add":
result += num
elif state.input.operation == "subtract":
result -= num
elif state.input.operation == "multiply":
result *= num
elif state.input.operation == "divide":
if num == 0:
raise ValueError("Cannot divide by zero")
result /= num
else:
raise ValueError(f"Unsupported operation: {state.input.operation}")
return {
"output": CalculatorOutput(
result=result,
operation=state.input.operation
)
}
# Create the graph with state schema
workflow = StateGraph(state_schema=CalculatorState)
print("Calculator graph for workflow created")
# Add the calculator tool node
workflow.add_node("calculator", ToolNode(calculator_function))
print("Calculator tool node added")
# Set the entry and exit points
workflow.set_entry_point("calculator")
workflow.set_finish_point("calculator")
print("Calculator workflow set")
return workflow.compile()
def create_search_tool() -> Graph:
"""Creates a search tool using DuckDuckGo that can search for information online."""
def search_function(state: SearchState) -> dict:
with DDGS() as ddgs:
# Run search
raw_results = list(ddgs.text(
state.input.query,
max_results=state.input.max_results
))
results = []
for r in raw_results:
try:
results.append(SearchResult(
title=r.get("title", ""),
link=r.get("href", r.get("link", "")), # DuckDuckGo sometimes uses "href"
snippet=r.get("body", r.get("snippet", ""))
))
except Exception as e:
print("Skipping malformed search result:", r, "Error:", e)
return {
"output": SearchOutput(
results=results,
query=state.input.query
)
}
# Create the graph with state schema
workflow = StateGraph(state_schema=SearchState)
# Add the search tool node
workflow.add_node("search", ToolNode(search_function))
# Set the entry and exit points
workflow.set_entry_point("search")
workflow.set_finish_point("search")
return workflow.compile()
# Example usage:
# if __name__ == "__main__":
# # Create the calculator tool
# calculator = create_calculator_tool()
# # Example calculation
# result = calculator.invoke({
# "input": {
# "operation": "add",
# "numbers": [1, 2, 3, 4]
# }
# })
# print(f"Result: {result['output'].result}")
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