diff --git a/modules/mesh-delivery-indexer/internal/index/revision_verb.go b/modules/mesh-delivery-indexer/internal/index/revision_verb.go
index e9a72a65..ffcf0d07 100644
--- a/modules/mesh-delivery-indexer/internal/index/revision_verb.go
+++ b/modules/mesh-delivery-indexer/internal/index/revision_verb.go
@@ -34,8 +34,8 @@ func RevisionCallers(entries []meshcatalog.CatalogEntry, holder string) stdio.Ca
 // graph revision, the trunk's newest when the input names none, a kept trunk revision by its number, or a candidate's by
 // its group and heads, with one page of its entries whole, by module name. The caller is the runtime's proof: it is
 // answered only when the newest trunk revision's entry of its module declares the verb in invokes, and the holder is
-// refused too. With no trunk revision kept yet nobody is answered and the reader waits (ErrNoRevision), never an empty
-// catalog.
+// refused too. With no trunk revision kept yet the answer is `none-yet` alone (design 47 G §530), never an empty
+// catalog and never an error.
 func Revision(ctx context.Context, o Objects, holder, caller string, in meshcatalog.RevisionInput) (meshcatalog.RevisionAnswer, error) {
 	var out meshcatalog.RevisionAnswer
 	newest, ok, err := newestTrunk(ctx, o)
@@ -43,7 +43,8 @@ func Revision(ctx context.Context, o Objects, holder, caller string, in meshcata
 		return out, fmt.Errorf("the catalog graph revisions cannot be read: %w", err)
 	}
 	if !ok {
-		return out, ErrNoRevision
+		// An answer is told by its fields (design 47 G §530): no trunk revision kept yet is `none-yet`, no error.
+		return meshcatalog.RevisionAnswer{NoneYet: true}, nil
 	}
 	_, trunkEntries, err := ReadRevision(ctx, o, RevisionObject(newest))
 	if err != nil {
diff --git a/modules/mesh-delivery-indexer/internal/index/toolchains_test.go b/modules/mesh-delivery-indexer/internal/index/toolchains_test.go
index 4e1e75aa..aab661ed 100644
--- a/modules/mesh-delivery-indexer/internal/index/toolchains_test.go
+++ b/modules/mesh-delivery-indexer/internal/index/toolchains_test.go
@@ -620,8 +620,8 @@ func TestBasesAreComputedFirstAndNoFingerprintTakesTheBuilder(t *testing.T) { //
 			t.Fatal(err)
 		}
 	}
-	if _, err := Revision(context.Background(), verbObjects, Module, "n1.node-tools", meshcatalog.RevisionInput{}); !errors.Is(err, ErrNoRevision) {
-		t.Errorf("revision with none kept answered %v, want it to wait", err)
+	if got, err := Revision(context.Background(), verbObjects, Module, "n1.node-tools", meshcatalog.RevisionInput{}); err != nil || !got.NoneYet || got.Revision != nil || len(got.Entries) != 0 {
+		t.Errorf("revision with none kept answered %+v, %v, want none-yet alone with no error (design 47 G §530)", got, err)
 	}
 	keep(meshcatalog.CatalogRevision{Revision: 3, Kind: "trunk"}, map[string]bool{"node-tools": true, Module: true})
 	keep(meshcatalog.CatalogRevision{Revision: 4, Kind: "candidate", Group: "feat/x", Heads: "0123456789ab"}, map[string]bool{"node-tools": true, "mesh-grants": true})