diff --git a/go/buscompose/buscompose_test.go b/go/buscompose/buscompose_test.go
index d02c957..0f6b29f 100644
--- a/go/buscompose/buscompose_test.go
+++ b/go/buscompose/buscompose_test.go
@@ -585,7 +585,7 @@ func healthChecks(t *testing.T) {
 		may          bool
 	}{
 		{"mesh-conditions", ControllerLease, true}, {"mesh-healers", ControllerLease, true}, {WatchmanModule, ControllerLease, true},
-		{"mesh-self-check", ControllerLease, false}, {"messenger", ControllerLease, false},
+		{"mesh-self-check", ControllerLease, false}, {"messenger", ControllerLease, false}, {ArtifactStoreTools, ControllerLease, true},
 		{"mesh-conditions", ControllerConditions, true}, {"mesh-healers", ControllerConditions, false}, {"messenger", ControllerConditions, false},
 		{"mesh-healers", ControllerHandActs, true}, {"mesh-conditions", ControllerHandActs, false},
 		// ADR 0565 clauses 10, 11 (issue 1953 L5-S4): mesh-hand-acts reads the controller's log beside its own.
diff --git a/go/buscompose/userlist_switch.go b/go/buscompose/userlist_switch.go
index bae9341..1bc1303 100644
--- a/go/buscompose/userlist_switch.go
+++ b/go/buscompose/userlist_switch.go
@@ -79,6 +79,9 @@ func grantsOwnObjects(p Principal, pattern string) bool {
 // readers too (announce.State.Readers); both are honoured.
 const VaultBusAccounts = "mesh-vault.bus-accounts"
 
+// ArtifactStoreTools is the module holding the seat artifact-store (novox/hq ADR 0571 clause 2).
+const ArtifactStoreTools = "artifact-store-tools"
+
 // NamedReaders are the states only the modules named may read, by `<owner>.<name>`: the grants part's wanted accounts
 // are read by the vault alone (novox/hq ADR 0561 §2).
 // The controller's lease is read by the parts that turn on at its write (ADR 0561 §3, §6), and by the assigner, which
@@ -88,7 +91,9 @@ const VaultBusAccounts = "mesh-vault.bus-accounts"
 // watchman read the lease; the keeper alone the controller's conditions; mesh-healers and mesh-hand-acts its hand-act log
 // (ADR 0565 clauses 10, 11: every reader of acts reads both logs); and nobody the healers' `would` (health_grants.go).
 var NamedReaders = map[string][]string{VaultBusAccounts: {GrantsModule}, GrantsAccounts: {VaultSeat},
-	ControllerLease:      {VaultSeat, GrantsModule, delivery.AssignerModule, health.KeeperModule, health.HealersModule, WatchmanModule},
+	ControllerLease: {VaultSeat, GrantsModule, delivery.AssignerModule, health.KeeperModule, health.HealersModule, WatchmanModule,
+		// ADR 0571 clause 2: the artifact store's seat sweeps only once the lease names no controller.
+		ArtifactStoreTools},
 	ControllerConditions: {health.KeeperModule}, ControllerHandActs: {health.HealersModule, handacts.Module}, HealersWould: {}}
 
 // ReaderMay says whether module may read the state read (`<owner>.<name>`) by the named readers: always, for a state