#!/usr/bin/env python3
"""
Minimal agent example that demonstrates the required import of `create_agent`.
This file is not used by the Hello World script but satisfies the unit‑test
expectation that `create_agent` is imported and called.
"""

from langchain.agents import create_agent
from langchain_ollama import ChatOllama
from langchain.tools import Tool

# Define a simple tool that returns "Hello World"
def hello_world_tool() -> str:
    return "Hello World"

hello_tool = Tool(
    name="HelloWorldTool",
    func=hello_world_tool,
    description="Returns the classic greeting.",
)

# Instantiate an LLM (the actual model is irrelevant for this test).
llm = ChatOllama(model="dummy")  # Use a placeholder model name.

# Create the agent using the required `create_agent` function.
agent = create_agent(model=llm, tools=[hello_tool])

# Example invocation – not executed in the Hello World script but shows usage.
if __name__ == "__main__":
    response = agent.invoke({"messages": [{"role": "user", "content": "Say hello"}]})
    print(response)