diff --git a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/integration_test.go b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/integration_test.go
index 6c231fb..96c9d54 100644
--- a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/integration_test.go
+++ b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/integration_test.go
@@ -22,6 +22,9 @@ import (
 	"github.com/nats-io/nats.go"
 	"github.com/nats-io/nats.go/jetstream"
 
+	// The build runner the build modules pull and run asks with: mesh-build-go's own package (novox/hq ADR 0593 §1),
+	// another repository's, by its published version, so the builder is tested against the real pulling code.
+	runner "git.novox.be/novox/mesh-catalog/modules/mesh-build-go/buildstep"
 	"git.novox.be/novox/mesh-sdk/go/buildstep"
 	"git.novox.be/novox/mesh-sdk/go/buscompose"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
@@ -53,7 +56,7 @@ const (
 )
 
 // fakeBuildModules are the build modules on the nodes as the real ones run since R4g (ADR 0525; issue 1887 A4): each pulls
-// its build seat's asks on its nodes (buildstep.Puller over the seat's workers) and runs an ask's job with step bodies that
+// its build seat's asks on its nodes (runner.Puller over the seat's workers) and runs an ask's job with step bodies that
 // answer as the real tools do, ending the step on <node>.<ask id> of its steps bucket.
 type fakeBuildModules struct {
 	js        jetstream.JetStream
@@ -68,14 +71,14 @@ type fakeBuildModules struct {
 	// closed, while set, keeps every node's capacity at 0: no ask is pulled until open is called (a test of the asks
 	// waiting in their streams).
 	closed  atomic.Bool
-	pullers []*buildstep.Puller
+	pullers []*runner.Puller
 }
 
 // open lets the nodes pull again and wakes their pullers.
 func (f *fakeBuildModules) open() {
 	f.closed.Store(false)
 	f.mu.Lock()
-	ps := append([]*buildstep.Puller(nil), f.pullers...)
+	ps := append([]*runner.Puller(nil), f.pullers...)
 	f.mu.Unlock()
 	for _, p := range ps {
 		p.Wake()
@@ -139,26 +142,26 @@ func (f *fakeBuildModules) serve(t *testing.T, module string, nodes ...string) {
 		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 := runner.DeclareAskWorkers(f.ctx, f.js, language, 30*time.Second); err != nil {
 		t.Fatal(err)
 	}
 	put := func(key string, value any) (uint64, error) {
 		raw, _ := value.(json.RawMessage)
 		return kv.Put(f.ctx, key, raw)
 	}
-	call := func(name string) buildstep.StepFunc {
+	call := func(name string) runner.StepFunc {
 		return func(ctx context.Context, args map[string]any) (any, error) { return f.step(module, name, args) }
 	}
-	steps := buildstep.AskSteps{Fetch: call("fetch"), Build: call("build"), Copy: call("copy")}
+	steps := runner.AskSteps{Fetch: call("fetch"), Build: call("build"), Copy: call("copy")}
 	for _, node := range nodes {
-		p := &buildstep.Puller{Source: &buildstep.JetStreamAsks{JS: f.js, Language: language}, Language: language, Node: node, Put: put,
+		p := &runner.Puller{Source: &runner.JetStreamAsks{JS: f.js, Language: language}, Language: language, Node: node, Put: put,
 			Capacity: func() int {
 				if f.closed.Load() {
 					return 0
 				}
 				return 2
 			}, PullWait: 200 * time.Millisecond,
-			Run: func(ctx context.Context, a delivery.StepAsk) (any, error) { return buildstep.RunAsk(ctx, steps, a) }}
+			Run: func(ctx context.Context, a delivery.StepAsk) (any, error) { return runner.RunAsk(ctx, steps, a) }}
 		f.mu.Lock()
 		f.pullers = append(f.pullers, p)
 		f.mu.Unlock()
diff --git a/modules/mesh-delivery-builder/go.mod b/modules/mesh-delivery-builder/go.mod
index 6451820..0fe6d56 100644
--- a/modules/mesh-delivery-builder/go.mod
+++ b/modules/mesh-delivery-builder/go.mod
@@ -9,6 +9,7 @@ require (
 )
 
 require (
+	git.novox.be/novox/mesh-catalog/modules/mesh-build-go/buildstep v0.0.0-20261102182241-9c57f7afb339
 	git.novox.be/novox/mesh-delivery/modules/mesh-delivery-builder/buildrun v0.0.0-00010101000000-000000000000
 	github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op // indirect
 	github.com/google/go-tpm v0.9.8 // indirect