[View code on GitHub](https://github.com/creatorrr/turbo-chat/blob/master/turbo_chat/types/tools.py)

The code provided defines a type alias called `Tool` that represents a specific type of callable function. This type alias is likely used throughout the turbo-chat project to represent functions that perform certain operations on strings and return the result asynchronously.

The `Tool` type alias is defined using the `Callable` and `Awaitable` types from the `typing` module. The `Callable` type is used to represent a function that can be called with a specific set of arguments and return a specific type. In this case, the `Tool` type alias represents a function that takes a single argument of type `str` (a string) and returns an `Awaitable[str]`.

The `Awaitable` type is used to represent an object that can be used with the `await` keyword in an asynchronous context. In this case, the `Awaitable[str]` type means that the function represented by the `Tool` type alias is expected to return a string asynchronously, i.e., the function is likely defined using the `async def` syntax.

The `__all__` variable is a list that defines the public interface of this module. It specifies which names should be imported when a client imports this module using a wildcard import (e.g., `from module_name import *`). In this case, the `__all__` list contains only the `Tool` type alias, indicating that this is the only name that should be imported from this module.

Here's an example of how the `Tool` type alias might be used in the turbo-chat project:

```python
from typing import List
from .tool_type import Tool

async def process_messages(messages: List[str], tool: Tool) -> List[str]:
    processed_messages = []
    for message in messages:
        processed_message = await tool(message)
        processed_messages.append(processed_message)
    return processed_messages
```

In this example, the `process_messages` function takes a list of messages and a `Tool` function as arguments. It processes each message using the provided `Tool` function and returns a list of processed messages.
## Questions: 
 1. **What is the purpose of the `Tool` type alias in this code?**

   The `Tool` type alias is defined as a `Callable` that takes a single `str` argument and returns an `Awaitable[str]`. This is used to represent a function or a method that takes a string input and returns an awaitable string object, which can be used in asynchronous programming.

2. **What is the significance of the `__all__` variable in this code?**

   The `__all__` variable is a list that defines the public interface of this module. It specifies which names should be imported when a client imports this module using a wildcard import (e.g., `from turbo_chat import *`). In this case, only the `Tool` type alias is part of the public interface.

3. **Why are the `Awaitable` and `Callable` types imported from the `typing` module?**

   The `Awaitable` and `Callable` types are imported from the `typing` module to provide type hints for the `Tool` type alias. These type hints help developers understand the expected input and output types for the `Tool` and can also be used by static type checkers to catch potential type-related issues in the code.