diff --git a/cmd/antidriftd/main.go b/cmd/antidriftd/main.go
index 012abac..1b9cc30 100644
--- a/cmd/antidriftd/main.go
+++ b/cmd/antidriftd/main.go
@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"antidrift/internal/ai"
+	"antidrift/internal/enforce"
 	"antidrift/internal/evidence"
 	"antidrift/internal/knowledge"
 	"antidrift/internal/session"
@@ -72,6 +73,9 @@ func main() {
 		log.Printf("status: writing %s", statusPath)
 	}
 
+	ctrl.SetGuard(enforce.NewGuard())
+	log.Printf("enforce: window-minimize guard")
+
 	src := evidence.NewSource()
 	go src.Watch(context.Background(), ctrl.RecordWindow)
 
diff --git a/internal/web/web_test.go b/internal/web/web_test.go
index 834006f..2de24f4 100644
--- a/internal/web/web_test.go
+++ b/internal/web/web_test.go
@@ -362,6 +362,37 @@ func TestReflectionFlowsToReviewThenPlanning(t *testing.T) {
 	}
 }
 
+type stubJudge struct{ verdict ai.Verdict }
+
+func (j stubJudge) JudgeDrift(ctx context.Context, commitment, class, title string) (ai.Verdict, error) {
+	return j.verdict, nil
+}
+
+func TestEnforceTogglePutsEnforcedOnTheWire(t *testing.T) {
+	s := newTestServer(t)
+	r := s.Router()
+	s.ctrl.SetDriftJudge(stubJudge{verdict: ai.Verdict{OnTask: false, Reason: "off-task"}})
+
+	if w := post(t, r, "/planning", ""); w.Code != http.StatusOK {
+		t.Fatalf("/planning code %d", w.Code)
+	}
+	body := `{"next_action":"a","success_condition":"b","timebox_secs":1500,"allowed_window_classes":["code"],"enforce":true}`
+	if w := post(t, r, "/commitment", body); w.Code != http.StatusOK {
+		t.Fatalf("/commitment code %d body %s", w.Code, w.Body.String())
+	}
+
+	s.ctrl.RecordWindow(evidence.WindowSnapshot{Class: "firefox", Title: "YouTube", Health: evidence.EvidenceHealth{Available: true}})
+
+	deadline := time.Now().Add(2 * time.Second)
+	for time.Now().Before(deadline) {
+		if strings.Contains(s.stateJSON(), `"enforced":true`) {
+			return
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+	t.Fatalf("state never reported enforced:true; last: %s", s.stateJSON())
+}
+
 func TestKnowledgePathSelectionReloads(t *testing.T) {
 	s := newTestServer(t)
 	s.ctrl.SetKnowledge(stubSource{profile: knowledge.Profile{Path: "/default"}})