diff --git a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/catalogholder_integration_test.go b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/catalogholder_integration_test.go
index 6461d173..8c541bac 100644
--- a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/catalogholder_integration_test.go
+++ b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/catalogholder_integration_test.go
@@ -6,6 +6,8 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"os"
+	"path/filepath"
 	"strings"
 	"sync"
 	"testing"
@@ -116,6 +118,21 @@ func (h *catalogHolder) buildSeats(t *testing.T, nc *nats.Conn, holders map[stri
 			defs[d.Seat] = d
 		}
 	}
+	// A seat of this repository's contracts module that the SDK's copy does not hold (mesh-builds) is read from its own file.
+	for seat := range holders {
+		if _, ok := defs[seat]; ok {
+			continue
+		}
+		raw, err := os.ReadFile(filepath.Join("..", "..", "..", "mesh-delivery-contracts", "seats", seat, "seat.json"))
+		if err != nil {
+			t.Fatalf("the definition of the seat %s: %v", seat, err)
+		}
+		d, err := seatdef.Parse(raw)
+		if err != nil {
+			t.Fatalf("the definition of the seat %s: %v", seat, err)
+		}
+		defs[seat] = d
+	}
 	for seat, on := range map[string]string{"node-build-go": "go", "node-build-node": "typescript", "node-build-image": seatdef.OnKindImage} {
 		d := defs[seat]
 		d.Acts = []seatdef.ActingRule{{Step: seatdef.StepBuild, On: on}}
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 7a264025..2e15f614 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
@@ -165,18 +165,9 @@ func (f *fakeBuildModules) serve(t *testing.T, module string, nodes ...string) {
 	if err := runner.DeclareAskWorkers(f.ctx, f.js, language, 30*time.Second); err != nil {
 		t.Fatal(err)
 	}
-	// Design 47 G §600: each queue's worker takes an ask in both forms, main's and the builder's (accept.<queue>.builder); the
-	// build modules' helper above filters main's alone, so the worker is declared again with both.
-	stream, _ := sdkstep.AskStream(language)
-	for _, kind := range sdkstep.AskKinds {
-		worker, _ := sdkstep.AskWorker(language, kind)
-		main, _ := sdkstep.AskSubject(language, kind)
-		byBuilder, _ := sdkstep.AskSubjectBy(language, kind, sdkstep.AskerBuilder)
-		if _, err := f.js.CreateOrUpdateConsumer(f.ctx, stream, jetstream.ConsumerConfig{Durable: worker, FilterSubjects: []string{main, byBuilder},
-			AckPolicy: jetstream.AckExplicitPolicy, AckWait: 30 * time.Second, MaxDeliver: 5}); err != nil {
-			t.Fatal(err)
-		}
-	}
+	// Design 47 G §544, §600: the build modules' helper declares each queue's two workers, main's and the named asks'
+	// (accept.<queue>.<asker>), and the puller takes from both; the bed declares none of its own, since a worker filtering
+	// both forms overlaps the named worker, which a work queue refuses.
 	put := func(key string, value any) (uint64, error) {
 		raw, _ := value.(json.RawMessage)
 		return kv.Put(f.ctx, key, raw)
@@ -289,7 +280,8 @@ func startBedWith(t *testing.T, closed bool) *bed {
 	// each have their durable consumer.
 	b.catalog = newCatalogHolder(t, ctx, js, ctl)
 	b.catalog.buildSeats(t, ctl, map[string]string{"node-build-go": testGo, "node-build-node": testNode, "node-build-image": testImage,
-		"git": "mesh-delivery-forge-bridge", "mesh-catalog": "mesh-delivery-indexer"}) // the floor's sources are the holders of git and mesh-catalog
+		"git": "mesh-delivery-forge-bridge", "mesh-catalog": "mesh-delivery-indexer", // the floor's sources are the holders of git and mesh-catalog
+		"mesh-builds": builds.BuilderModule}) // the builder's own seat, whose verb reserved it answers once its definition is read (A-115, A-278)
 	readers := []string{"n1_" + builds.BuilderModule, "n2_" + builds.BuilderModule}
 	// The seat mesh-module-assigner's holder is read from the seat's verb assignments, as the builder finds it at run time (A-119).
 	assignerSub, err := ctl.Subscribe("mesh.seat.mesh-module-assigner.call.assignments.>", func(m *nats.Msg) {