diff --git a/modules/mesh-build-go/cmd/mesh-build-go/asks.go b/modules/mesh-build-go/cmd/mesh-build-go/asks.go
index 1ba9be038..8991c7b77 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/asks.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/asks.go
@@ -56,7 +56,10 @@ func (m *Module) askSteps(steps []StepTool) steprun.AskSteps {
 // Puller is the module's pull of its seat's asks, on source (the runtime's seat pull when nil).
 func (m *Module) Puller(steps []StepTool, source steprun.AskSource) *steprun.Puller {
 	if source == nil {
-		source = steprun.SeatAsks{Language: sdkstep.AskGo}
+		source = &steprun.SeatAsks{Language: sdkstep.AskGo, Logf: m.Say}
+		if m.Callers == nil {
+			m.Callers = steprun.SeatListCallers(sdkstep.AskGo, m.Say)
+		}
 	}
 	capacity := m.Capacity
 	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
@@ -88,7 +91,7 @@ func (m *Module) Puller(steps []StepTool, source steprun.AskSource) *steprun.Pul
 	if m.SayEvent != nil {
 		say = steprun.SayOn(sdkstep.AskGo, m.Node, m.SayEvent)
 	}
-	return &steprun.Puller{Source: source, Language: sdkstep.AskGo, Say: say, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load, ForgetPause: m.ForgetPause, WatchPauses: m.WatchPauses, PauseKeys: m.ReadPauses.Keys,
+	return &steprun.Puller{Source: source, Language: sdkstep.AskGo, Say: say, Callers: m.Callers, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load, ForgetPause: m.ForgetPause, WatchPauses: m.WatchPauses, PauseKeys: m.ReadPauses.Keys,
 		Capacity: capacity, SettingsFile: settings, WatchConfig: watch, CoresPerStep: cores, BuildHours: hours, Logf: m.Say, Has: m.Has,
 		Run: func(ctx context.Context, a sdkstep.StepAsk) (any, error) {
 			if err := m.Check(ctx); err != nil {
diff --git a/modules/mesh-build-go/cmd/mesh-build-go/asks_integration_test.go b/modules/mesh-build-go/cmd/mesh-build-go/asks_integration_test.go
index 8766d9215..9fe1d64d0 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/asks_integration_test.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/asks_integration_test.go
@@ -52,7 +52,11 @@ func TestTheModuleTakesADeliveryAskBeforeAnEarlierCheck(t *testing.T) {
 	first := deliveryAsk()
 	for _, a := range []sdkstep.StepAsk{check, first} {
 		raw, _ := sdkstep.EncodeStepAsk(a)
+		// A build rides main's subject, any other kind a named asker's (design 47 G §543).
 		subject, _ := sdkstep.AskSubject(a.Language, a.Kind)
+		if a.Kind != sdkstep.AskDelivery {
+			subject, _ = sdkstep.AskSubjectBy(a.Language, a.Kind, "mesh-delivery-checker")
+		}
 		if _, err := js.Publish(ctx, subject, raw); err != nil {
 			t.Fatal(err)
 		}
diff --git a/modules/mesh-build-go/cmd/mesh-build-go/asks_say_test.go b/modules/mesh-build-go/cmd/mesh-build-go/asks_say_test.go
index 2c8f1ccdd..f10e55ab4 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/asks_say_test.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/asks_say_test.go
@@ -11,11 +11,15 @@ import (
 func TestPullerSaysTheSeatsEventsOnItsNodesSubject(t *testing.T) {
 	var subjects []string
 	m := &Module{Node: "ace", Capacity: func() int { return 0 },
+		Callers:  func(kind string) ([]string, bool) { return []string{"mesh-pipeline-runner"}, kind == "step" },
 		SayEvent: func(subject string, _ any, _ string) error { subjects = append(subjects, subject); return nil }}
 	p := m.Puller(nil, steprun.NewFakeAsks())
 	if p.Say == nil {
 		t.Fatal("the puller says no event")
 	}
+	if got, ok := p.Callers("step"); !ok || len(got) != 1 {
+		t.Fatalf("the puller checks the callers of %v, %v, not the module's", got, ok)
+	}
 	seat, _ := sdkstep.BuildSeat(sdkstep.AskGo)
 	for _, event := range []string{"ask-taken", "step-progress", "step-ended"} {
 		if err := p.Say(event, nil, "id"); err != nil {
diff --git a/modules/mesh-build-go/cmd/mesh-build-go/module.go b/modules/mesh-build-go/cmd/mesh-build-go/module.go
index eee129e90..3b179c5e3 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/module.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/module.go
@@ -24,6 +24,9 @@ const CheckRound = 10 * time.Minute
 // Module is the Go build module's one running state: the node it runs on, its recipe, the toolchain guard and the
 // states it writes (toolchains, steps).
 type Module struct {
+	// Callers says which seats the build seat's definition lists as callers of an accepted kind (steprun.SeatListCallers when
+	// the module pulls through its runtime; nil in a test checks no named asker): design 47 G §543, A-163.
+	Callers func(kind string) ([]string, bool)
 	// SayEvent publishes an event of the go build seat on a seat subject (stdio.SeatPublish; nil says none, a test's): the
 	// puller's ask-taken, step-progress and step-ended (design 47 G §496, §602).
 	SayEvent func(subject string, body any, id string) error
diff --git a/modules/mesh-build-image/cmd/mesh-build-image/asks.go b/modules/mesh-build-image/cmd/mesh-build-image/asks.go
index e2f2e188e..95ea231a4 100644
--- a/modules/mesh-build-image/cmd/mesh-build-image/asks.go
+++ b/modules/mesh-build-image/cmd/mesh-build-image/asks.go
@@ -37,7 +37,10 @@ func (m *Module) askSteps(steps []StepTool) steprun.AskSteps {
 // Puller is the module's pull of its seat's asks, on source (the runtime's seat pull when nil).
 func (m *Module) Puller(steps []StepTool, source steprun.AskSource) *steprun.Puller {
 	if source == nil {
-		source = steprun.SeatAsks{Language: sdkstep.AskImage}
+		source = &steprun.SeatAsks{Language: sdkstep.AskImage, Logf: m.Say}
+		if m.Callers == nil {
+			m.Callers = steprun.SeatListCallers(sdkstep.AskImage, m.Say)
+		}
 	}
 	capacity := m.Capacity
 	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
@@ -66,7 +69,7 @@ func (m *Module) Puller(steps []StepTool, source steprun.AskSource) *steprun.Pul
 	if m.SayEvent != nil {
 		say = steprun.SayOn(sdkstep.AskImage, m.Node, m.SayEvent)
 	}
-	return &steprun.Puller{Source: source, Language: sdkstep.AskImage, Say: say, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load, ForgetPause: m.ForgetPause, WatchPauses: m.WatchPauses, PauseKeys: m.ReadPauses.Keys,
+	return &steprun.Puller{Source: source, Language: sdkstep.AskImage, Say: say, Callers: m.Callers, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load, ForgetPause: m.ForgetPause, WatchPauses: m.WatchPauses, PauseKeys: m.ReadPauses.Keys,
 		Capacity: capacity, SettingsFile: settings, WatchConfig: watch, CoresPerStep: cores, BuildHours: hours, Eligible: m.Eligible, Logf: m.Say,
 		Run: func(ctx context.Context, a sdkstep.StepAsk) (any, error) {
 			if err := m.Check(ctx); err != nil {
diff --git a/modules/mesh-build-image/cmd/mesh-build-image/asks_say_test.go b/modules/mesh-build-image/cmd/mesh-build-image/asks_say_test.go
index afe9e94e5..dd42d4a9a 100644
--- a/modules/mesh-build-image/cmd/mesh-build-image/asks_say_test.go
+++ b/modules/mesh-build-image/cmd/mesh-build-image/asks_say_test.go
@@ -11,11 +11,15 @@ import (
 func TestPullerSaysTheSeatsEventsOnItsNodesSubject(t *testing.T) {
 	var subjects []string
 	m := &Module{Node: "ace", Capacity: func() int { return 0 },
+		Callers:  func(kind string) ([]string, bool) { return []string{"mesh-pipeline-runner"}, kind == "step" },
 		SayEvent: func(subject string, _ any, _ string) error { subjects = append(subjects, subject); return nil }}
 	p := m.Puller(nil, steprun.NewFakeAsks())
 	if p.Say == nil {
 		t.Fatal("the puller says no event")
 	}
+	if got, ok := p.Callers("step"); !ok || len(got) != 1 {
+		t.Fatalf("the puller checks the callers of %v, %v, not the module's", got, ok)
+	}
 	seat, _ := sdkstep.BuildSeat(sdkstep.AskImage)
 	for _, event := range []string{"ask-taken", "step-progress", "step-ended"} {
 		if err := p.Say(event, nil, "id"); err != nil {
diff --git a/modules/mesh-build-image/cmd/mesh-build-image/module.go b/modules/mesh-build-image/cmd/mesh-build-image/module.go
index b9b9bd84b..d1799f421 100644
--- a/modules/mesh-build-image/cmd/mesh-build-image/module.go
+++ b/modules/mesh-build-image/cmd/mesh-build-image/module.go
@@ -20,6 +20,9 @@ const CheckRound = 10 * time.Minute
 
 // Module is the image build module's one running state.
 type Module struct {
+	// Callers says which seats the build seat's definition lists as callers of an accepted kind (steprun.SeatListCallers when
+	// the module pulls through its runtime; nil in a test checks no named asker): design 47 G §543, A-163.
+	Callers func(kind string) ([]string, bool)
 	// SayEvent publishes an event of the image build seat on a seat subject (stdio.SeatPublish; nil says none, a test's): the
 	// puller's ask-taken, step-progress and step-ended (design 47 G §496, §602).
 	SayEvent func(subject string, body any, id string) error
diff --git a/modules/mesh-build-node/cmd/mesh-build-node/asks.go b/modules/mesh-build-node/cmd/mesh-build-node/asks.go
index fcdfdc37e..b2043f107 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/asks.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/asks.go
@@ -47,7 +47,10 @@ func (m *Module) askSteps(steps []StepTool) steprun.AskSteps {
 // Puller is the module's pull of its seat's asks, on source (the runtime's seat pull when nil).
 func (m *Module) Puller(steps []StepTool, source steprun.AskSource) *steprun.Puller {
 	if source == nil {
-		source = steprun.SeatAsks{Language: sdkstep.AskNode}
+		source = &steprun.SeatAsks{Language: sdkstep.AskNode, Logf: m.Say}
+		if m.Callers == nil {
+			m.Callers = steprun.SeatListCallers(sdkstep.AskNode, m.Say)
+		}
 	}
 	capacity := m.Capacity
 	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
@@ -76,7 +79,7 @@ func (m *Module) Puller(steps []StepTool, source steprun.AskSource) *steprun.Pul
 	if m.SayEvent != nil {
 		say = steprun.SayOn(sdkstep.AskNode, m.Node, m.SayEvent)
 	}
-	return &steprun.Puller{Source: source, Language: sdkstep.AskNode, Say: say, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load, ForgetPause: m.ForgetPause, WatchPauses: m.WatchPauses, PauseKeys: m.ReadPauses.Keys,
+	return &steprun.Puller{Source: source, Language: sdkstep.AskNode, Say: say, Callers: m.Callers, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load, ForgetPause: m.ForgetPause, WatchPauses: m.WatchPauses, PauseKeys: m.ReadPauses.Keys,
 		Capacity: capacity, SettingsFile: settings, WatchConfig: watch, CoresPerStep: cores, BuildHours: hours, Logf: m.Say,
 		Run: func(ctx context.Context, a sdkstep.StepAsk) (any, error) {
 			if err := m.Prepare(ctx); err != nil {
diff --git a/modules/mesh-build-node/cmd/mesh-build-node/asks_say_test.go b/modules/mesh-build-node/cmd/mesh-build-node/asks_say_test.go
index 5869cb558..3ab0b2618 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/asks_say_test.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/asks_say_test.go
@@ -11,11 +11,15 @@ import (
 func TestPullerSaysTheSeatsEventsOnItsNodesSubject(t *testing.T) {
 	var subjects []string
 	m := &Module{Node: "ace", Capacity: func() int { return 0 },
+		Callers:  func(kind string) ([]string, bool) { return []string{"mesh-pipeline-runner"}, kind == "step" },
 		SayEvent: func(subject string, _ any, _ string) error { subjects = append(subjects, subject); return nil }}
 	p := m.Puller(nil, steprun.NewFakeAsks())
 	if p.Say == nil {
 		t.Fatal("the puller says no event")
 	}
+	if got, ok := p.Callers("step"); !ok || len(got) != 1 {
+		t.Fatalf("the puller checks the callers of %v, %v, not the module's", got, ok)
+	}
 	seat, _ := sdkstep.BuildSeat(sdkstep.AskNode)
 	for _, event := range []string{"ask-taken", "step-progress", "step-ended"} {
 		if err := p.Say(event, nil, "id"); err != nil {
diff --git a/modules/mesh-build-node/cmd/mesh-build-node/module.go b/modules/mesh-build-node/cmd/mesh-build-node/module.go
index d81efb06d..a5efcaab1 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/module.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/module.go
@@ -25,6 +25,9 @@ const CheckRound = 10 * time.Minute
 // Module is the Node build module's one running state: the node it runs on, its recipe, the toolchain guard, the
 // toolchain directory and the states it writes (toolchains, steps).
 type Module struct {
+	// Callers says which seats the build seat's definition lists as callers of an accepted kind (steprun.SeatListCallers when
+	// the module pulls through its runtime; nil in a test checks no named asker): design 47 G §543, A-163.
+	Callers func(kind string) ([]string, bool)
 	// SayEvent publishes an event of the node build seat on a seat subject (stdio.SeatPublish; nil says none, a test's): the
 	// puller's ask-taken, step-progress and step-ended (design 47 G §496, §602).
 	SayEvent func(subject string, body any, id string) error