// Add user message immediately for session integrity under concurrent access
        final ChatMessage userChatMessage = ChatMessage.userMessage(userMessage);
        session.addMessage(userChatMessage);

        try {
            // Intent detection
            final IntentDetectionResult intentResult = llmClientManager.detectIntent(userMessage, history);
            if (logger.isDebugEnabled()) {

                startIndex = i;
            } else {
                break;
            }
        }

        for (int i = startIndex; i < history.size(); i++) {
            request.addMessage(history.get(i));
        }
    }

    /**
     * Builds the evaluation prompt for relevance checking.
     *
     * @param userMessage the user's message
     * @param query the search query