// Create: user, assistant, user, assistant, user, assistant (6 messages)
        session.addUserMessage("User 1");
        session.addAssistantMessage("Assistant 1");
        session.addUserMessage("User 2");
        session.addAssistantMessage("Assistant 2");
        session.addUserMessage("User 3");
        session.addAssistantMessage("Assistant 3");
        assertEquals(6, session.getMessageCount());

    public static final String ROLE_USER = "user";

    /** The role identifier for assistant messages. */
    public static final String ROLE_ASSISTANT = "assistant";

    /** The unique identifier for this message. */
    private String id;

    /** The role of the message sender (user or assistant). */
    private String role;

    /** The content of the message. */
    private String content;

        final LlmChatRequest result = request.addAssistantMessage("Assistant response");

        assertSame(request, result);
        assertEquals(1, request.getMessages().size());
        assertEquals(LlmMessage.ROLE_ASSISTANT, request.getMessages().get(0).getRole());
        assertEquals("Assistant response", request.getMessages().get(0).getContent());
    }

    @Test

        return new LlmMessage(ROLE_USER, content);
    }

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

    /**
     * Gets the message role.

        assertEquals("Q1", history.get(0).getContent());
        assertEquals("assistant", history.get(1).getRole());
        assertEquals("A1", history.get(1).getContent());
        assertEquals("user", history.get(2).getRole());
        assertEquals("Q2", history.get(2).getContent());
        assertEquals("assistant", history.get(3).getRole());
        assertEquals("A2", history.get(3).getContent());
    }

     *
     * @param content the message content
     */
    public void addUserMessage(final String content) {
        addMessage(ChatMessage.userMessage(content));
    }

    /**
     * Adds an assistant message to this session.
     *
     * @param content the message content
     */
    public void addAssistantMessage(final String content) {
        addMessage(ChatMessage.assistantMessage(content));
    }

        message.setId("msg-123");
        message.setRole("assistant");
        message.setContent("Test content");
        message.setTimestamp(timestamp);
        message.setSources(sources);

        assertEquals("msg-123", message.getId());
        assertEquals("assistant", message.getRole());
        assertEquals("Test content", message.getContent());

    /**
     * Gets the maximum characters for assistant message in history.
     *
     * @return the maximum characters
     */
    default int getHistoryAssistantMaxChars() {
        return 800;
    }

    /**
     * Gets the maximum characters for assistant summary in history.
     *
     * @return the maximum characters
     */

        labels: {
            thinking: 'Thinking...',
            waiting: '...',
            error: 'An error occurred. Please try again.',
            sources: 'Sources',
            statusReady: 'AI Assistant',
            statusThinking: 'Processing',
            statusError: 'Error',
            copied: 'Copied!',
            copyFailed: 'Copy failed',
            phases: {
                intent: 'Analyzing question...',

    /**
     * Gets the maximum characters for assistant message content in history.
     * The default returns 800. Override in subclasses for provider-specific tuning.
     *
     * @return the maximum characters
     */
    @Override
    public int getHistoryAssistantMaxChars() {
        return 800;
    }

    /**
     * Gets the maximum characters for assistant summary content in history.