diff --git a/modules/mesh-delivery-indexer/internal/index/seed_steps.go b/modules/mesh-delivery-indexer/internal/index/seed_steps.go
index adbe12b8..934fbe62 100644
--- a/modules/mesh-delivery-indexer/internal/index/seed_steps.go
+++ b/modules/mesh-delivery-indexer/internal/index/seed_steps.go
@@ -13,6 +13,7 @@ import (
 	mcc "git.novox.be/novox/mesh-contracts/health-and-repair/go/clients/meshconditionsclient"
 	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/meshcatalog"
 	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/nodebuildgo"
+	sdkstep "git.novox.be/novox/mesh-delivery/modules/mesh-delivery-sdk/buildstep"
 	"git.novox.be/novox/mesh-sdk/go/keys"
 	"git.novox.be/novox/mesh-sdk/go/seatdef"
 )
@@ -77,7 +78,7 @@ func (ix *Indexer) SeedModulesFrom(ctx context.Context, defs map[string]seatdef.
 	unbuilt := map[string][]string{} // module -> each artifact of it no build seat builds, with its language or kind
 	for _, e := range entries {
 		for _, a := range e.Artifacts {
-			if packedOrFetched(a) {
+			if sdkstep.PackedOrFetched(a.Language, a.Kind) {
 				continue
 			}
 			seat, err := buildSeatOf(defs, a)
@@ -103,7 +104,7 @@ func (ix *Indexer) SeedModulesFrom(ctx context.Context, defs map[string]seatdef.
 		}
 		for _, a := range e.Artifacts {
 			name := artifactName(a.Ref)
-			if packedOrFetched(a) {
+			if sdkstep.PackedOrFetched(a.Language, a.Kind) {
 				// The builder packs or fetches it: no steps call, and its lint, unit and integration are bypass (A-324).
 				m.Artifacts = append(m.Artifacts, SeedArtifact{Name: name, Answered: true})
 				continue
@@ -135,12 +136,6 @@ func (ix *Indexer) SeedModulesFrom(ctx context.Context, defs map[string]seatdef.
 	return out, nil
 }
 
-// packedOrFetched says the artifact is one the builder packs or fetches itself, of kind archive or upstream with no
-// language: it has no lint, unit or integration step, so no build seat's steps is called for it (design 47 G A-324).
-func packedOrFetched(a meshcatalog.Artifact) bool {
-	return a.Language == "" && (a.Kind == "archive" || a.Kind == "upstream")
-}
-
 // unbuiltWords names an artifact no build seat builds, with its language, else its kind.
 func unbuiltWords(a meshcatalog.Artifact) string {
 	if a.Language != "" {
diff --git a/modules/mesh-delivery-pipeline/internal/pipeline/place.go b/modules/mesh-delivery-pipeline/internal/pipeline/place.go
index 48feee34..b4037762 100644
--- a/modules/mesh-delivery-pipeline/internal/pipeline/place.go
+++ b/modules/mesh-delivery-pipeline/internal/pipeline/place.go
@@ -16,6 +16,7 @@ import (
 	nodebuildgo "git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/nodebuildgo"
 	nodebuildimage "git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/nodebuildimage"
 	nodebuildnode "git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/nodebuildnode"
+	sdkstep "git.novox.be/novox/mesh-delivery/modules/mesh-delivery-sdk/buildstep"
 	"git.novox.be/novox/mesh-sdk/go/seatdef"
 )
 
@@ -96,7 +97,7 @@ func Place(p seat.Pipeline, reg catalog.Registration, entries map[string]catalog
 		for _, step := range buildSteps {
 			status := Status(reg, name, step)
 			why := "bypassed by the module's policy"
-			if packedOrFetched(a) {
+			if sdkstep.PackedOrFetched(a.Language, a.Kind) {
 				status, why = seat.StepResultStatusBypass, fmt.Sprintf("an artifact of kind %s has no %s step: the builder packs or fetches it", a.Kind, step)
 			}
 			s := seat.StepResult{Step: step, Artifact: a.Ref, Status: status, Fingerprint: p.Fingerprint}
@@ -147,13 +148,6 @@ func Place(p seat.Pipeline, reg catalog.Registration, entries map[string]catalog
 	return steps, asks
 }
 
-// packedOrFetched says the artifact is one the builder packs or fetches itself, of kind archive or upstream with no language:
-// it has no lint, unit or integration step, so those are bypass whatever the policy says and no build seat is asked
-// (design 47 G A-324, A-325).
-func packedOrFetched(a catalog.Artifact) bool {
-	return a.Language == "" && (a.Kind == "archive" || a.Kind == "upstream")
-}
-
 // Asked is one ask to put on a build seat's work queue.
 type Asked struct {
 	Seat string
diff --git a/modules/mesh-delivery-sdk/buildstep/packed.go b/modules/mesh-delivery-sdk/buildstep/packed.go
new file mode 100644
index 00000000..807ca36c
--- /dev/null
+++ b/modules/mesh-delivery-sdk/buildstep/packed.go
@@ -0,0 +1,9 @@
+package buildstep
+
+// PackedOrFetched says an artifact of language and kind (its catalog entry's) is one the builder packs or fetches itself,
+// of kind archive or upstream with no language: it has no lint, unit or integration step, so the seed calls no build seat's
+// steps for it and the runner places those steps bypassed, whatever the policy says (design 47 G A-324, A-325). The
+// indexer's seed and the runner read this one rule.
+func PackedOrFetched(language, kind string) bool {
+	return language == "" && (kind == "archive" || kind == "upstream")
+}
diff --git a/modules/mesh-delivery-sdk/buildstep/step_test.go b/modules/mesh-delivery-sdk/buildstep/step_test.go
index bc93f2b0..284e6290 100644
--- a/modules/mesh-delivery-sdk/buildstep/step_test.go
+++ b/modules/mesh-delivery-sdk/buildstep/step_test.go
@@ -87,3 +87,17 @@ func TestParseStepKeyReadsBothFormsAndRefusesAThird(t *testing.T) {
 		}
 	}
 }
+
+// Design 47 G A-324, A-325: only an artifact of kind archive or upstream with no language is packed or fetched by the builder.
+func TestPackedOrFetchedIsAnArchiveOrUpstreamWithNoLanguage(t *testing.T) {
+	for _, c := range []struct {
+		language, kind string
+		want           bool
+	}{
+		{"", "archive", true}, {"", "upstream", true}, {"go", "archive", false}, {"", "image", false}, {"go", "", false}, {"", "", false},
+	} {
+		if got := PackedOrFetched(c.language, c.kind); got != c.want {
+			t.Errorf("PackedOrFetched(%q, %q) = %v, want %v", c.language, c.kind, got, c.want)
+		}
+	}
+}