CustomAgent.py

import datasets
from langchain.docstore.document import Document
# Load the dataset
# guest_dataset = datasets.load_dataset("agents-course/unit3-invitees", split="train")

# Convert dataset entries into Document objects
# docs = [
#     Document(
#         page_content="\n".join([
#             f"Name: {guest['name']}",
#             f"Relation: {guest['relation']}",
#             f"Description: {guest['description']}",
#             f"Email: {guest['email']}"
#         ]),
#         metadata={"name": guest["name"]}
#     )
#     for guest in guest_dataset
# ]

# from langchain_community.retrievers import BM25Retriever
# from langchain.tools import Tool

# bm25_retriever = BM25Retriever.from_documents(docs)

# def extract_text(query: str) -> str:
#     """Retrieves detailed information about gala guests based on their name or relation."""
#     results = bm25_retriever.invoke(query)
#     if results:
#         return "\n\n".join([doc.page_content for doc in results[:3]])
#     else:
#         return "No matching guest information found."

# guest_info_tool = Tool(
#     name="guest_info_retriever",
#     func=extract_text,
#     description="Retrieves detailed information about gala guests based on their name or relation."
# )
#######################################################################################################################################################
from typing import TypedDict, Annotated
from langgraph.graph.message import add_messages
from langchain_core.messages import AnyMessage, HumanMessage, AIMessage,SystemMessage
from langgraph.prebuilt import ToolNode
from langgraph.graph import START, StateGraph
from langgraph.prebuilt import tools_condition
from langchain_openai import ChatOpenAI
#from WebSearch import weather_info_tool
from other_tools import (
    wiki_search, arvix_search, web_search, vector_search, 
    multiply, add, subtract, divide, modulus, power, square_root
)
import os
from dotenv import load_dotenv
load_dotenv()
# Generate the chat interface, including the tools
llm = ChatOpenAI(temperature=0
                   , model="gpt-4o-mini", openai_api_key=os.getenv("OPENAI_KEY"))

tools = [
    wiki_search, arvix_search, web_search, 
    multiply, add, subtract, divide, modulus, power, square_root
]
chat_with_tools = llm.bind_tools(tools)

#setting up prompt
ai_message = SystemMessage(content="""You are a helpful assistant tasked with answering questions using a set of tools and reference materials.

You may be provided with a reference set of questions and answers from a retriever. 
If the current question is identical to or semantically equivalent to a reference question, or if a reference answer clearly applies, use that reference answer directly.

Otherwise, reason through the question as needed to determine the correct answer.

Your output must follow these formatting rules:
- If the answer is a number, do not use commas or units (unless specifically requested).
- If the answer is a string, do not use articles, abbreviations, or short forms. Write digits in full unless specified otherwise.
- If the answer is a comma-separated list, apply the above rules to each item and include exactly one space after each comma.
- If the question matches a reference question, return the reference answer exactly as it appears.

Do not include any explanation, prefix, or extra text—output only the final answer.
""")






# Generate the AgentState and Agent graph
from langgraph.graph import MessagesState #the same as AgentState
# class AgentState(TypedDict):
#     messages: Annotated[list[AnyMessage], add_messages]

def assistant(state: MessagesState):
    return {
        "messages": [chat_with_tools.invoke(state["messages"])],
    }

def retriever(state: MessagesState):
    """Retriever node"""
    similar_question = vector_search(state["messages"][0].content)

    if similar_question:
        example_msg = HumanMessage(
            content=f"Here I provide a similar question and answer for reference: \n\n{similar_question}",
        )
        print(f"Similar question found: {similar_question}")
        return {"messages": [ai_message] + state["messages"] + [example_msg]}
    else:
        # Handle the case when no similar questions are found
        print( "No similar question found.")
        return {"messages": [ai_message] + state["messages"]}

## The graph
builder = StateGraph(MessagesState)


# Define nodes: these do the work
builder.add_node("assistant", assistant)
builder.add_node("retriever", retriever)
builder.add_node("tools", ToolNode(tools))

# Define edges: these determine how the control flow moves
builder.add_edge(START, "retriever")
builder.add_edge("retriever", "assistant")
builder.add_conditional_edges(
    "assistant",
    # If the latest message requires a tool, route to tools
    # Otherwise, provide a direct response
    tools_condition,
)
builder.add_edge("tools", "assistant")
alfred = builder.compile()

# messages = [HumanMessage(content="When was a picture of St. Thomas Aquinas first added to the Wikipedia page on the Principle of double effect?")]
# #messages = [HumanMessage(content="What the remainder of 30 divided by 7?")]
# response = alfred.invoke({"messages": messages})


# print(response['messages'][-1].content)