diff --git a/scripts/harb-evaluator/red-team-sweep.sh b/scripts/harb-evaluator/red-team-sweep.sh
index a41b9e2..d52ec7e 100755
--- a/scripts/harb-evaluator/red-team-sweep.sh
+++ b/scripts/harb-evaluator/red-team-sweep.sh
@@ -116,7 +116,7 @@ PYEOF
   # 3. Run red-team.sh (handles bootstrap + compile + deploy + attack)
   log "Running red-team.sh (timeout: ${TIMEOUT_PER}s)..."
   set +e
-  CLAUDE_TIMEOUT="$TIMEOUT_PER" CANDIDATE_NAME="$seed_name" OPTIMIZER_PROFILE="$OPTIMIZER_PROFILE" \
+  CLAUDE_TIMEOUT="$TIMEOUT_PER" CANDIDATE_NAME="$seed_name" OPTIMIZER_PROFILE="$OPTIMIZER_PROFILE" SWEEP_ID="$SWEEP_ID" \
     timeout "$((TIMEOUT_PER + 120))" \
     bash "$SCRIPT_DIR/red-team.sh" 2>&1 | tee "/tmp/red-team-${seed_name}.log"
   RED_TEAM_EXIT="${PIPESTATUS[0]}"
diff --git a/scripts/harb-evaluator/red-team.sh b/scripts/harb-evaluator/red-team.sh
index c2ed250..daedecd 100755
--- a/scripts/harb-evaluator/red-team.sh
+++ b/scripts/harb-evaluator/red-team.sh
@@ -201,8 +201,8 @@ EOF
     run_num=1
   fi
 
-  python3 - "$stream_file" "$memory_file" "$run_num" "$LM_ETH_BEFORE" "$CANDIDATE_NAME" "$OPTIMIZER_PROFILE" <<'PYEOF'
-import json, sys, re
+  python3 - "$stream_file" "$memory_file" "$run_num" "$LM_ETH_BEFORE" "$CANDIDATE_NAME" "$OPTIMIZER_PROFILE" "$CROSS_PATTERNS_FILE" <<'PYEOF'
+import json, os, sys, re
 from datetime import datetime, timezone
 
 stream_file = sys.argv[1]
@@ -215,6 +215,8 @@ except (ValueError, IndexError):
     sys.exit(0)
 candidate = sys.argv[5] if len(sys.argv) > 5 else "unknown"
 optimizer_profile = sys.argv[6] if len(sys.argv) > 6 else "unknown"
+cross_file = sys.argv[7] if len(sys.argv) > 7 else None
+sweep_id = os.environ.get("SWEEP_ID", "unknown")
 
 def make_pattern(strategy_name, steps_text):
     """Extract abstract op sequence preserving execution order."""
@@ -376,10 +378,46 @@ if len(all_entries) > 50:
     seen = set()
     deduped = []
     for e in trimmed:
+        # 3-tuple key: run+ts uniquely identifies the extract_memory call; strategy
+        # distinguishes entries within the same call.  Matches step-4c's identity check.
         key = (e.get("run"), e.get("ts"), e.get("strategy"))
         if key not in seen:
             seen.add(key)
             deduped.append(e)
+
+    # Export entries that would be dropped to cross-patterns before discarding them
+    if cross_file:
+        kept_keys = {(e.get("run"), e.get("ts"), e.get("strategy")) for e in deduped}
+        dropped = [e for e in all_entries if (e.get("run"), e.get("ts"), e.get("strategy")) not in kept_keys]
+        if dropped:
+            existing_cross_keys = set()
+            try:
+                with open(cross_file) as cf:
+                    for line in cf:
+                        line = line.strip()
+                        if line:
+                            try:
+                                ce = json.loads(line)
+                                existing_cross_keys.add((ce.get("pattern", ""), ce.get("candidate", ""), ce.get("result", "")))
+                            except Exception:
+                                pass
+            except FileNotFoundError:
+                pass
+            try:
+                exported = 0
+                with open(cross_file, "a") as cf:
+                    for e in dropped:
+                        key = (e.get("pattern", ""), e.get("candidate", ""), e.get("result", ""))
+                        if key not in existing_cross_keys:
+                            existing_cross_keys.add(key)
+                            e.setdefault("sweep_id", sweep_id)
+                            cf.write(json.dumps(e) + "\n")
+                            exported += 1
+                if exported:
+                    print(f"  Pre-trim export: {exported} dropped entr{'y' if exported == 1 else 'ies'} saved to cross-patterns")
+            except Exception as ex:
+                print(f"  WARNING: pre-trim export failed: {ex}", file=sys.stderr)
+
     with open(memory_file, "w") as f:
         for e in deduped:
             f.write(json.dumps(e) + "\n")