diff --git a/crates/aura-cli/src/main.rs b/crates/aura-cli/src/main.rs
index f4b6990..2f0731b 100644
--- a/crates/aura-cli/src/main.rs
+++ b/crates/aura-cli/src/main.rs
@@ -3998,6 +3998,69 @@ mod tests {
         let _ = std::fs::remove_dir_all(&dir);
     }
 
+    #[test]
+    fn reproduce_re_derives_the_member_stop_regime_not_the_default() {
+        // Property: reproduce re-runs each member under the SAME stop regime the member
+        // was minted with (its manifest stamps stop_length/stop_k) — the stop defines
+        // the risk unit R and is part of the member's identity (C1). A family minted
+        // under a NON-default vol-stop regime (a campaign risk-regime cell, or wf/mc/
+        // generalize with --stop-length/--stop-k) must still reproduce bit-identically;
+        // silently re-running it under the default Vol{3,2.0} reports a spurious DIVERGED.
+        let dir = std::env::temp_dir().join(format!("aura-repro-stop-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        std::fs::create_dir_all(&dir).expect("temp dir");
+        let reg = Registry::open(dir.join("runs.jsonl"));
+
+        let env = project::Env::std();
+        let data = DataSource::Synthetic;
+        // A CLOSED blueprint (both SMA knobs bound): its wrapped param_space is empty, so
+        // the stop regime is the ONLY dimension that can differ between mint and reproduce
+        // — isolating the defect to the hardcoded reproduce-side stop.
+        let closed = load_closed_r_sma();
+        let doc = blueprint_to_json(&closed).expect("serializes");
+        let reload = || blueprint_from_json(&doc, &|t| std_vocabulary(t)).expect("loads");
+        let topo = topology_hash(&reload());
+        let space = blueprint_axis_probe(&doc, &env).param_space();
+        let pip = data.pip_size();
+        let window = data.full_window(&env);
+
+        // Mint one member under a NON-default vol-stop regime (default is length=3, k=2.0).
+        // run_blueprint_member stamps stop_length=8/stop_k=4.0 into the manifest params.
+        let non_default = StopRule::Vol { length: 8, k: 4.0 };
+        let report = run_blueprint_member(
+            reload(),
+            &[],
+            &space,
+            data.run_sources(&env),
+            window,
+            0,
+            pip,
+            &topo,
+            &env,
+            non_default,
+        );
+
+        // persist exactly as the sweep/campaign paths do: store the blueprint, append the family.
+        let canonical = blueprint_to_json(&reload()).unwrap();
+        reg.put_blueprint(&topo, &canonical).expect("store blueprint");
+        let id = reg
+            .append_family("stoprepro", FamilyKind::Sweep, &[report])
+            .expect("append");
+
+        // reproduce: the member re-derives bit-identically only if reproduce honours the
+        // manifest's recorded stop regime — currently DIVERGED because reproduce hardcodes
+        // the default Vol{3,2.0} for both the param-space probe and the member re-run.
+        let rep = reproduce_family_in(&reg, &id, &data, &env);
+        assert_eq!(rep.outcomes.len(), 1, "one member reproduced");
+        assert!(
+            rep.outcomes.iter().all(|(_, ok)| *ok),
+            "the non-default-stop member re-derives bit-identically: {:?}",
+            rep.outcomes
+        );
+
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+
     #[test]
     fn reproduce_family_re_derives_every_mc_member_bit_identically() {
         let dir = std::env::temp_dir().join(format!("aura-repro-mc-{}", std::process::id()));