diff --git a/modules/mesh-delivery-checker/cmd/mesh-delivery-checker/integration_test.go b/modules/mesh-delivery-checker/cmd/mesh-delivery-checker/integration_test.go
index 3a65048..f42d8ec 100644
--- a/modules/mesh-delivery-checker/cmd/mesh-delivery-checker/integration_test.go
+++ b/modules/mesh-delivery-checker/cmd/mesh-delivery-checker/integration_test.go
@@ -22,9 +22,9 @@ import (
 	"github.com/nats-io/nats.go"
 	"github.com/nats-io/nats.go/jetstream"
 
+	gobuild "git.novox.be/novox/mesh-catalog/modules/mesh-build-go/buildstep"
 	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-builder/buildrun"
 	"git.novox.be/novox/mesh-sdk/go/announce"
-	"git.novox.be/novox/mesh-sdk/go/buildstep"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
 	"git.novox.be/novox/mesh-sdk/go/process"
 
@@ -88,7 +88,7 @@ type fakeBuildModules struct {
 	calls    map[string]int // by `<module>.<tool>`
 	testTool *testing.T
 	// beside is, by workspace, the siblings the fetch placed in it as `<owner/repo> <commit>`, sorted: a digest echoes them
-	// (1929/AC2; mesh-sdk buildstep.besideOf), or the level runs whole and keeps nothing.
+	// (1929/AC2; mesh-build-go buildstep.besideOf), or the level runs whole and keeps nothing.
 	beside map[string][]string
 	// names are the nodes' names the last check ask carried, for the names check (ADR 0567 §12).
 	names []string
@@ -156,11 +156,11 @@ func (f *fakeBuildModules) serve(t *testing.T, module string, kept jetstream.Key
 		t.Fatal(err)
 	}
 	language := strings.TrimPrefix(module, "mesh-build-")
-	if err := buildstep.DeclareAskWorkers(f.ctx, f.js, language, 30*time.Second); err != nil {
+	if err := gobuild.DeclareAskWorkers(f.ctx, f.js, language, 30*time.Second); err != nil {
 		t.Fatal(err)
 	}
 	prefix := map[string]string{"mesh-build-go": "build_go_", "mesh-build-node": "build_node_"}[module]
-	call := func(name string) buildstep.StepFunc {
+	call := func(name string) gobuild.StepFunc {
 		return func(ctx context.Context, args map[string]any) (any, error) {
 			tool := prefix + name
 			f.mu.Lock()
@@ -169,7 +169,7 @@ func (f *fakeBuildModules) serve(t *testing.T, module string, kept jetstream.Key
 			return f.result(t, tool, args), nil
 		}
 	}
-	steps := buildstep.AskSteps{Fetch: call("fetch"), Test: call("test"),
+	steps := gobuild.AskSteps{Fetch: call("fetch"), Test: call("test"),
 		Kept: func(ctx context.Context, level, digest string) (int, bool, error) {
 			key, err := delivery.KeptKey(level, digest)
 			if err != nil {
@@ -192,7 +192,7 @@ func (f *fakeBuildModules) serve(t *testing.T, module string, kept jetstream.Key
 		raw, _ := value.(json.RawMessage)
 		return kv.Put(f.ctx, key, raw)
 	}
-	p := &buildstep.Puller{Source: &buildstep.JetStreamAsks{JS: f.js, Language: language}, Language: language, Node: "n1", Put: put,
+	p := &gobuild.Puller{Source: &gobuild.JetStreamAsks{JS: f.js, Language: language}, Language: language, Node: "n1", Put: put,
 		Capacity: func() int { return 2 }, PullWait: 200 * time.Millisecond,
 		Run: func(ctx context.Context, a delivery.StepAsk) (any, error) {
 			if a.Check != nil {
@@ -200,7 +200,7 @@ func (f *fakeBuildModules) serve(t *testing.T, module string, kept jetstream.Key
 				f.names = a.Check.NodeNames
 				f.mu.Unlock()
 			}
-			return buildstep.RunAsk(ctx, steps, a)
+			return gobuild.RunAsk(ctx, steps, a)
 		}}
 	go func() { _ = p.Pull(f.ctx) }()
 }
diff --git a/modules/mesh-delivery-checker/go.mod b/modules/mesh-delivery-checker/go.mod
index d8a8fe7..fd9ebb3 100644
--- a/modules/mesh-delivery-checker/go.mod
+++ b/modules/mesh-delivery-checker/go.mod
@@ -3,6 +3,7 @@ module mesh-delivery-checker
 go 1.26.0
 
 require (
+	git.novox.be/novox/mesh-catalog/modules/mesh-build-go/buildstep v0.0.0-20261102182241-9c57f7afb339
 	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261102112556-abf5eace7791
 	github.com/nats-io/nats-server/v2 v2.11.17
 	github.com/nats-io/nats.go v1.54.0
diff --git a/modules/mesh-delivery-checker/internal/check/examiner_test.go b/modules/mesh-delivery-checker/internal/check/examiner_test.go
index 8a4ea45..1eedd5d 100644
--- a/modules/mesh-delivery-checker/internal/check/examiner_test.go
+++ b/modules/mesh-delivery-checker/internal/check/examiner_test.go
@@ -18,8 +18,8 @@ import (
 	"time"
 	"unicode/utf8"
 
+	gobuild "git.novox.be/novox/mesh-catalog/modules/mesh-build-go/buildstep"
 	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-builder/buildrun"
-	"git.novox.be/novox/mesh-sdk/go/buildstep"
 	"git.novox.be/novox/mesh-sdk/go/composer"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
@@ -136,12 +136,12 @@ func refsOf(v any) []BesideRef {
 // toolPrefix is the start of each build module's tool names, as the fake build modules answer them.
 var toolPrefix = map[string]string{buildrun.GoBuildModule: "build_go_", buildrun.NodeBuildModule: "build_node_"}
 
-// answer runs a check ask as the build module that pulls it does (buildstep.RunAsk), with the fake tools on shanks and the
+// answer runs a check ask as the build module that pulls it does (gobuild.RunAsk), with the fake tools on shanks and the
 // bench's kept verdicts, and answers the step it writes.
 func (b *bench) answer(a delivery.StepAsk) delivery.Step {
 	module, _ := delivery.BuildModuleOf(a.Language)
 	const node = "shanks"
-	tool := func(name string) buildstep.StepFunc {
+	tool := func(name string) gobuild.StepFunc {
 		return func(ctx context.Context, args map[string]any) (any, error) {
 			raw, err := b.steps.Run(ctx, module, node, toolPrefix[module]+name, args)
 			if err != nil {
@@ -150,7 +150,7 @@ func (b *bench) answer(a delivery.StepAsk) delivery.Step {
 			return raw, nil
 		}
 	}
-	steps := buildstep.AskSteps{Fetch: tool("fetch"), Test: tool("test"),
+	steps := gobuild.AskSteps{Fetch: tool("fetch"), Test: tool("test"),
 		Kept: func(ctx context.Context, level, digest string) (int, bool, error) {
 			k, found, err := (Kept{Store: b.kept}).Lookup(ctx, level, digest)
 			return k.Tests, found, err
@@ -168,7 +168,7 @@ func (b *bench) answer(a delivery.StepAsk) delivery.Step {
 		}
 		steps.Has = func(string) bool { return true }
 	}
-	out, err := buildstep.RunAsk(context.Background(), steps, a)
+	out, err := gobuild.RunAsk(context.Background(), steps, a)
 	step := delivery.Step{ID: a.ID, Tool: a.Kind + " ask", Node: node, State: delivery.StepPassed, Started: began, Ended: began.Add(2 * time.Second)}
 	if err != nil {
 		step.State, step.Reason = delivery.StepFailed, err.Error()