diff --git a/internal/kernel/runtime.go b/internal/kernel/runtime.go
index 9d36430..c2531e4 100644
--- a/internal/kernel/runtime.go
+++ b/internal/kernel/runtime.go
@@ -19,7 +19,11 @@ import (
 	"moos/kernel/internal/reactive"
 )
 
-const subscriberBufferSize = 64
+const (
+	subscriberBufferSize        = 64
+	driftAnnotationSemanticPort = "{semantic}"
+	driftAnnotationContractURN  = graph.URN("urn:moos:contract:hdc-drift-annotation.v1")
+)
 
 // Runtime is the kernel — the effect layer wrapping the pure catamorphism.
 // It holds the current graph state (derived), the append-only log (truth),
@@ -888,14 +892,18 @@ func (rt *Runtime) runHDCIndexAndDriftLocked(trigger graph.Envelope) {
 		}
 
 		linkClaim := graph.Envelope{
-			RewriteType:     graph.LINK,
-			RewriteCategory: graph.WF11,
+			RewriteType: graph.LINK,
+			// Re-home drift annotations to WF15 open-semantic links.
+			// WF11 only declares synced-via/sync-target; the old tagged/tagged-in
+			// pair was rejected by the declaration gate (moos-kernel#52).
+			RewriteCategory: graph.WF15,
 			Actor:           actor,
 			RelationURN:     relURN,
 			SrcURN:          claimURN,
-			SrcPort:         "tagged",
+			SrcPort:         driftAnnotationSemanticPort,
 			TgtURN:          row.URN,
-			TgtPort:         "tagged-in",
+			TgtPort:         driftAnnotationSemanticPort,
+			ContractURN:     driftAnnotationContractURN,
 		}
 		rt.applyReactiveLocked(linkClaim)
 	}
diff --git a/internal/kernel/runtime_reactive_test.go b/internal/kernel/runtime_reactive_test.go
index 8c238b4..4f960cd 100644
--- a/internal/kernel/runtime_reactive_test.go
+++ b/internal/kernel/runtime_reactive_test.go
@@ -485,12 +485,12 @@ func TestRuntime_HDCDriftEmitsClaimAndAnnotation(t *testing.T) {
 
 	var annotationCount int
 	for _, rel := range rt.state.Relations {
-		if rel.RewriteCategory == graph.WF11 {
+		if rel.RewriteCategory == graph.WF15 && rel.ContractURN == driftAnnotationContractURN {
 			annotationCount++
 		}
 	}
 	if annotationCount == 0 {
-		t.Fatal("expected at least one WF11 drift annotation relation")
+		t.Fatal("expected at least one WF15 semantic drift annotation relation")
 	}
 
 	expressions = rt.HDCTypeExpressions()