*/
    public static LlmMessage system(final String content) {
        return new LlmMessage(ROLE_SYSTEM, content);
    }

    /**
     * Creates a user message with the specified content.
     *
     * @param content the message content
     * @return a new user message
     */
    public static LlmMessage user(final String content) {
        return new LlmMessage(ROLE_USER, content);
    }

    /**

    public void test_systemFactory() {
        final LlmMessage message = LlmMessage.system("System prompt");
        assertEquals(LlmMessage.ROLE_SYSTEM, message.getRole());
        assertEquals("System prompt", message.getContent());
    }

    @Test
    public void test_userFactory() {
        final LlmMessage message = LlmMessage.user("User question");
        assertEquals(LlmMessage.ROLE_USER, message.getRole());

     */
    public LlmChatRequest addMessage(final LlmMessage message) {
        messages.add(message);
        return this;
    }

    /**
     * Adds a system message to the request.
     *
     * @param content the message content
     * @return this request for method chaining
     */
    public LlmChatRequest addSystemMessage(final String content) {
        messages.add(LlmMessage.system(content));
        return this;
    }