Usage Example:

1. Maintain the conversation history in a local variable (List of Message Structure).

2. When the user sends a new message (text or uploads an image):

• Append the user's message (with appropriate Role, MessageType, and Content) to the local history variable.

• Call the Completions action, passing the API key, the updated history variable, and the desired model(s).

3. On successful return:

• Display the Response text to the user.

Update your local history variable with the returned MessageHistory output to include the AI's response for the next turn.