final String systemPrompt = capturedRequest.getMessages().get(0).getContent();
        assertTrue(systemPrompt.contains("no_relevant_results"));
    }

    @Test
    public void test_regenerateQuery_emptyHistory() {
        client.setChatResponse("{\"query\": \"simple query\", \"reasoning\": \"test\"}");

        final String result = client.regenerateQuery("question", "original", "no_results", Collections.emptyList());