final List<LlmMessage> messages = request.getMessages();
        // system + user = 2 messages (no history added)
        assertEquals(2, messages.size());
    }

    @Test
    public void test_buildIntentRequest_trimsHistoryToMaxSix() {
        final List<LlmMessage> history = new ArrayList<>();
        history.add(LlmMessage.user("Q1"));
        history.add(LlmMessage.assistant("A1"));
        history.add(LlmMessage.user("Q2"));