How to Diagnose Bad Search Quality Before tuning, establish baselines. Use exact KNN as ground truth, compare against approximate HNSW. Target 95% recall@K for production. Don't Know What's Wrong Yet Use when: results are irrelevant or missing expected matches and you need to isolate the cause. - For a no-code quick check, use the Web UI's ANN Recall tab to compare approximate vs exact Web UI ANN Recall - For the same comparison in code (CI gating, regression tests), run each query twice — once approximate, once with — and compute from the overlap ANN recall in CI - Exact search bad = model o…