diff --git a/internal/sanitize/types.go b/internal/sanitize/types.go
index 9c522a8a..8e4a9353 100644
--- a/internal/sanitize/types.go
+++ b/internal/sanitize/types.go
@@ -95,11 +95,17 @@ func isOperationalLabel(key string) bool {
 // that belongs in Git, and stripping them would silently drop a user's sync
 // ordering. Hence the exact-key match.
 //
+// `kcp.io/cluster` is matched exactly for the same reason. kcp stamps it on every
+// object to name the logical cluster the object was read from, so it is an address
+// rather than intent: committed to Git it would pin a manifest to one workspace and
+// travel with it into every other. Sibling `kcp.io/` keys are not assumed to be
+// bookkeeping too, so this is not a prefix strip either.
+//
 // Exercised end-to-end against a real Argo CD in
 // test/e2e/argocd_bi_directional_e2e_test.go.
 func isOperationalAnnotation(key string) bool {
 	switch key {
-	case "argocd.argoproj.io/tracking-id", "argocd.argoproj.io/installation-id":
+	case "argocd.argoproj.io/tracking-id", "argocd.argoproj.io/installation-id", "kcp.io/cluster":
 		return true
 	}
 
diff --git a/internal/sanitize/types_test.go b/internal/sanitize/types_test.go
index c0b36f80..64b0344b 100644
--- a/internal/sanitize/types_test.go
+++ b/internal/sanitize/types_test.go
@@ -309,12 +309,37 @@ func TestCleanAnnotations(t *testing.T) {
 				"argocd.argoproj.io/hook":            "kept",
 			},
 		},
+		{
+			// kcp names the logical cluster an object was read from. It is an address,
+			// not intent: in Git it would pin the manifest to one workspace and travel
+			// with it into every other.
+			name: "remove kcp logical-cluster annotation",
+			input: map[string]string{
+				"kcp.io/cluster":  "root:org:team",
+				"user-annotation": "kept",
+			},
+			expected: map[string]string{
+				"user-annotation": "kept",
+			},
+		},
+		{
+			// Exact-key, not a `kcp.io/` prefix strip: sibling keys under the prefix are
+			// not assumed to be bookkeeping.
+			name: "keep other kcp annotations",
+			input: map[string]string{
+				"kcp.io/path": "kept",
+			},
+			expected: map[string]string{
+				"kcp.io/path": "kept",
+			},
+		},
 		{
 			name: "all annotations operational - return nil",
 			input: map[string]string{
 				"kubectl.kubernetes.io/last-applied-configuration": "removed",
 				"control-plane.alpha.kubernetes.io/leader":         "removed",
 				"argocd.argoproj.io/tracking-id":                   "removed",
+				"kcp.io/cluster":                                   "removed",
 			},
 			expected: nil,
 		},