* @param message the error message
     */
    public LlmException(final String message) {
        super(message);
        errorCode = ERROR_UNKNOWN;
    }

    /**
     * Creates a new exception with the specified message and cause.
     *
     * @param message the error message
     * @param cause the cause of the exception
     */
    public LlmException(final String message, final Throwable cause) {

        final LlmException exception = new LlmException("Error occurred", cause);
        assertEquals(LlmException.ERROR_UNKNOWN, exception.getErrorCode());
    }

    @Test
    public void test_constructorWithMessageAndErrorCode() {
        final LlmException exception = new LlmException("Rate limit exceeded", LlmException.ERROR_RATE_LIMIT);

    /**
     * Performs a chat completion request.
     *
     * @param request the chat request containing messages and parameters
     * @return the chat response from the LLM
     * @throws LlmException if an error occurs during the request
     */
    LlmChatResponse chat(LlmChatRequest request);

    /**
     * Performs a streaming chat completion request.