diff --git a/crates/aura-cli/tests/research_docs.rs b/crates/aura-cli/tests/research_docs.rs
index 36bdc80..ad5b1e7 100644
--- a/crates/aura-cli/tests/research_docs.rs
+++ b/crates/aura-cli/tests/research_docs.rs
@@ -667,6 +667,58 @@ fn campaign_introspect_unwired_lists_the_risk_slot_when_explicitly_empty() {
     );
 }
 
+/// #265: the cost and risk slots name their knobs but not their UNITS or
+/// SEMANTICS, and the two natural misreadings are silent (wrong by orders of
+/// magnitude / change an experiment's meaning, with no error). Property: when
+/// `campaign introspect --unwired` lists the open cost and risk slots, each of
+/// the four silently-misreadable knobs carries a one-line unit/semantics note
+/// that blocks its misreading — `constant.cost_per_trade` is in PRICE units
+/// (charged per close as cost/|entry−stop| in R), `vol_slippage.slip_vol_mult`
+/// is a MULTIPLIER on the per-cycle vol estimate (charged in R likewise),
+/// `vol.length` SMOOTHS the estimator and does NOT set the stop's timescale,
+/// and `vol.k` SCALES the stop distance. Autonomous: a bare `{}` envelope
+/// (both slots open) written inline, no project, hostless. Wording stays free
+/// (matched case-insensitively on load-bearing fragments, not whole lines); it
+/// fails today because the annotations are absent, not on scaffolding.
+#[test]
+fn campaign_introspect_unwired_annotates_cost_and_risk_knob_units() {
+    let dir = temp_cwd("campaign-introspect-unwired-knob-units");
+    write_doc(&dir, "bare.json", "{}");
+    let (out, code) = run_code_in(&dir, &["campaign", "introspect", "--unwired", "bare.json"]);
+    assert_eq!(code, Some(0), "stdout/stderr: {out}");
+    let low = out.to_lowercase();
+
+    // constant.cost_per_trade — price units, not R (the order-of-magnitude trap).
+    assert!(low.contains("cost_per_trade"), "the cost knob must still be named: {out}");
+    assert!(
+        low.contains("price units"),
+        "cost_per_trade must be annotated as a PRICE-unit numerator (its misreading is a cost in R): {out}"
+    );
+
+    // vol_slippage.slip_vol_mult — a multiplier on the per-cycle vol estimate.
+    assert!(low.contains("slip_vol_mult"), "the vol-slippage knob must still be named: {out}");
+    assert!(
+        low.contains("multiplier on the per-cycle vol"),
+        "slip_vol_mult must be annotated as a MULTIPLIER on the per-cycle vol estimate: {out}"
+    );
+
+    // vol.length — smooths the estimator; it does NOT set the stop's timescale.
+    assert!(
+        low.contains("smooths"),
+        "vol.length must be annotated as SMOOTHING the per-cycle vol estimator: {out}"
+    );
+    assert!(
+        low.contains("does not set the stop's timescale"),
+        "vol.length must state it does NOT set the stop's timescale (its exact misreading): {out}"
+    );
+
+    // vol.k — scales the stop distance (the risk-unit lever).
+    assert!(
+        low.contains("scales the stop distance"),
+        "vol.k must be annotated as SCALING the stop distance (the risk-unit lever): {out}"
+    );
+}
+
 #[test]
 fn campaign_introspect_unwired_reports_the_spec_example_slots() {
     let dir = temp_cwd("campaign-introspect-unwired");