from langchain.tools import tool
from typing import List

@tool
def add_numbers(a: int, b: int) -> int:
    """
    Add two numbers and return the sum.

    Parameters
    ----------
    a : int
        The first number.
    b : int
        The second number.

    Returns
    -------
    int
        The sum of a and b.
    """
    return a + b

@tool
def search_item(items: List[str], query: str) -> List[str]:
    """
    Search for items containing the query string (case-insensitive).

    Parameters
    ----------
    items : List[str]
        The list of items to search.
    query : str
        The search query.

    Returns
    -------
    List[str]
        A list of items that contain the query string.
    """
    query_lower = query.lower()
    return [item for item in items if query_lower in item.lower()]