if (Constants.NONE.equals(llmType)) {
            throw new LlmException("LLM client is not available");
        }
        if (!isRagChatEnabled()) {
            throw new LlmException("LLM client is not available");
        }
        final LlmClient client = getClient();
        if (client == null || !client.isAvailable()) {
            throw new LlmException("LLM client is not available");
        }
        return client;

                logger.debug("SSE stream completed. sessionId={}, hasHtmlContent={}", result.getSessionId(), htmlContent != null);
            }

        } catch (final LlmException e) {
            // LlmException from streamChatEnhanced already sent onError via callback - avoid double-send
            logger.warn("LLM error during stream request. sessionId={}, errorCode={}, message={}", sessionId, e.getErrorCode(),