diff --git a/cmd/mbf/internal/pkgserver/api.go b/cmd/mbf/internal/pkgserver/api.go
index e73b8bbe..125be829 100644
--- a/cmd/mbf/internal/pkgserver/api.go
+++ b/cmd/mbf/internal/pkgserver/api.go
@@ -30,7 +30,7 @@ var (
 // handleInfo writes constant system information.
 func handleInfo(w http.ResponseWriter, _ *http.Request) {
 	infoPayloadOnce.Do(func() {
-		infoPayload.Count = int(rosa.Native().Count())
+		infoPayload.Count = len(rosa.Native().Collect())
 		infoPayload.HakureiVersion = info.Version()
 	})
 	// TODO(mae): cache entire response if no additional fields are planned
diff --git a/cmd/mbf/internal/pkgserver/api_test.go b/cmd/mbf/internal/pkgserver/api_test.go
index 4c178fb9..3a9945da 100644
--- a/cmd/mbf/internal/pkgserver/api_test.go
+++ b/cmd/mbf/internal/pkgserver/api_test.go
@@ -31,7 +31,7 @@ func TestAPIInfo(t *testing.T) {
 	checkPayload(t, resp, struct {
 		Count          int    `json:"count"`
 		HakureiVersion string `json:"hakurei_version"`
-	}{rosa.Native().Count(), info.Version()})
+	}{len(rosa.Native().Collect()), info.Version()})
 }
 
 func TestAPIGet(t *testing.T) {
@@ -92,11 +92,12 @@ func TestAPIGet(t *testing.T) {
 		)
 	})
 
+	count := len(rosa.Native().Collect())
 	t.Run("index", func(t *testing.T) {
 		t.Parallel()
 		checkValidate(
-			t, "limit=1&sort=0&index", 0, rosa.Native().Count()-1,
-			"index must be an integer between 0 and "+strconv.Itoa(rosa.Native().Count()-1),
+			t, "limit=1&sort=0&index", 0, count-1,
+			"index must be an integer between 0 and "+strconv.Itoa(count-1),
 		)
 	})
 
diff --git a/cmd/mbf/main.go b/cmd/mbf/main.go
index f87d388f..bf057115 100644
--- a/cmd/mbf/main.go
+++ b/cmd/mbf/main.go
@@ -387,7 +387,7 @@ func main() {
 			}
 
 		done:
-			for _, p := range rosa.Native().Collect() {
+			for _, p := range rosa.Native().CollectAll() {
 				select {
 				case w <- p:
 					break
diff --git a/internal/rosa/package/kernel/package.az b/internal/rosa/package/kernel/package.az
index 70dbe28d..d768ebac 100644
--- a/internal/rosa/package/kernel/package.az
+++ b/internal/rosa/package/kernel/package.az
@@ -1,6 +1,7 @@
 package kernel-source {
 	description = "unpatched Linux kernel source tree";
 	website = "https://kernel.org";
+	exclude = true;
 
 	version* = "6.12.87";
 	output = remoteTar {
diff --git a/internal/rosa/package/musl/package.az b/internal/rosa/package/musl/package.az
index 893567e8..11ffd0c0 100644
--- a/internal/rosa/package/musl/package.az
+++ b/internal/rosa/package/musl/package.az
@@ -1,5 +1,6 @@
 package musl-source {
 	description = "an implementation of the C standard library - source code";
+	exclude = true;
 
 	version* = "1.2.6";
 	output = remoteTar {
diff --git a/internal/rosa/package/stage0.az b/internal/rosa/package/stage0.az
index 02930657..d1276b82 100644
--- a/internal/rosa/package/stage0.az
+++ b/internal/rosa/package/stage0.az
@@ -1,5 +1,6 @@
 package stage0-dist {
 	description = "Rosa OS stage0 bootstrap seed";
+	exclude = true;
 
 	version* = "20260504";
 	output = remoteTar {
diff --git a/internal/rosa/state.go b/internal/rosa/state.go
index 6ff6f1cf..7cdf7cb5 100644
--- a/internal/rosa/state.go
+++ b/internal/rosa/state.go
@@ -384,14 +384,14 @@ func (s *S) mustRegister(
 	})
 }
 
-// Count returns the number of [Artifact] registered to s.
-func (s *S) Count() int {
+// count returns the number of [Artifact] registered to s.
+func (s *S) count() int {
 	return int(s.artifactCount.Load())
 }
 
-// Collect returns all [ArtifactH] registered to s.
-func (s *S) Collect() (handles P) {
-	handles = make(P, 0, s.Count())
+// CollectAll returns all [ArtifactH] registered to s.
+func (s *S) CollectAll() (handles P) {
+	handles = make(P, 0, s.count())
 	s.artifacts.Range(func(key, _ any) bool {
 		handles = append(handles, key.(ArtifactH))
 		return true
@@ -402,6 +402,23 @@ func (s *S) Collect() (handles P) {
 	return
 }
 
+// Collect returns all non-excluded [ArtifactH] registered to s.
+func (s *S) Collect() (handles P) {
+	handles = make(P, 0, s.count())
+	s.artifacts.Range(func(key, _ any) bool {
+		h := key.(ArtifactH)
+		meta, _ := s.Std().MustLoad(h)
+		if !meta.Exclude {
+			handles = append(handles, h)
+		}
+		return true
+	})
+	slices.SortFunc(handles, func(a, b ArtifactH) int {
+		return strings.Compare(a.String(), b.String())
+	})
+	return
+}
+
 // deferredGit is a call to Toolchain.newTagRemote from azalea.
 type deferredGit struct {
 	url      string
@@ -915,6 +932,7 @@ func (ctx *evalContext) pf(
 		k("description"): &meta.Description,
 		k("website"):     &meta.Website,
 		k("version"):     &meta.Version,
+		k("exclude"):     &meta.Exclude,
 		k("anitya"):      &anitya,
 		k("latest"):      &meta.latest,