client.testAddHistoryWithBudget(request, history, 100);
        assertEquals(0, request.getMessages().size());
    }

    @Test
    public void test_addHistoryWithBudget_fallbackTruncation() {
        final List<LlmMessage> history = new ArrayList<>();
        history.add(LlmMessage.user("A".repeat(500)));
        final LlmChatRequest request = new LlmChatRequest();