diff --git a/mcp-server/index.ts b/mcp-server/index.ts
index 3029b1a..814e8a5 100644
--- a/mcp-server/index.ts
+++ b/mcp-server/index.ts
@@ -519,7 +519,12 @@ async function main() {
             }
           }
           const hybridRes = await api("POST", "/vectors/hybrid", {
-            question: b.question, index_name: b.index || "workers_500k_v1",
+            // Default index MUST share an id-space with the default filter_dataset.
+            // ethereal_workers (10K SQL rows) aligns with ethereal_workers_v1 (10K
+            // chunks). The old default workers_500k_v1 (50K chunks, different worker set)
+            // returned wrong-state workers flagged sql_verified:true — e.g. state='IL'
+            // surfaced a KY worker, because worker_id 1768 is a different person in each.
+            question: b.question, index_name: b.index || "ethereal_workers_v1",
             sql_filter: filter, filter_dataset: b.dataset || "ethereal_workers",
             id_column: b.id_column || "worker_id", top_k: b.top_k || 5, generate: b.generate !== false,
             use_playbook_memory: b.use_playbook_memory !== false,