diff --git a/cmd/mesh-controller/batches_test.go b/cmd/mesh-controller/batches_test.go
index a5010630..90a5ac8a 100644
--- a/cmd/mesh-controller/batches_test.go
+++ b/cmd/mesh-controller/batches_test.go
@@ -119,6 +119,24 @@ func everyHeadWaits(t *testing.T) {
 	t.Cleanup(func() { deliveryGroupOf = was })
 }
 
+// groupStates stubs mesh-delivery's word on one group: its members and their states, which a test changes as the
+// members merge.
+func groupStates(t *testing.T, head string, states map[string]string) {
+	t.Helper()
+	was := deliveryGroupOf
+	deliveryGroupOf = func(_ context.Context, _ bool, asked string) ([]groupMember, bool, error) {
+		if asked != head {
+			return nil, false, nil
+		}
+		var members []groupMember
+		for repository, state := range states {
+			members = append(members, groupMember{Repository: repository, State: state})
+		}
+		return members, true, nil
+	}
+	t.Cleanup(func() { deliveryGroupOf = was })
+}
+
 // fromHead is a merge from a head branch a test names: merges from one head are members of one delivery group,
 // related by it (novox/hq ADR 0304 decision 1), so they share a batch whatever else they share.
 func fromHead(m link.SourceMoved, head string) link.SourceMoved {
diff --git a/cmd/mesh-controller/check_siblings.go b/cmd/mesh-controller/check_siblings.go
index b2e5626e..df08f3f5 100644
--- a/cmd/mesh-controller/check_siblings.go
+++ b/cmd/mesh-controller/check_siblings.go
@@ -127,10 +127,15 @@ func siblingsFor(p link.PullUpdated, entries []inventory.Entry, beside map[strin
 // could not be learned (ADR 0382 §1): a check never waits on mesh-delivery past groupAskWithin and never fails for it,
 // so a fix to mesh-delivery is still checked without it.
 func withSiblings(ctx context.Context, request *link.BuildRequest, p link.PullUpdated, entries []inventory.Entry) {
+	lines, err := groupsAsked(ctx, deliverySeatHeld(entries))
+	siblingsFrom(request, p, entries, lines, err)
+}
+
+// siblingsFrom is withSiblings from mesh-delivery's answer already had.
+func siblingsFrom(request *link.BuildRequest, p link.PullUpdated, entries []inventory.Entry, lines []groupsLine, err error) {
 	if request.Check == nil {
 		return
 	}
-	lines, err := groupsAsked(ctx, deliverySeatHeld(entries))
 	if err != nil {
 		request.Check.SiblingsUnknown = fmt.Sprintf("mesh-delivery did not say the group's pull requests (%v): "+
 			"the check reads no siblings", err)
@@ -138,3 +143,23 @@ func withSiblings(ctx context.Context, request *link.BuildRequest, p link.PullUp
 	}
 	request.Check.Siblings, request.Check.SiblingsUnknown = siblingsFor(p, entries, request.Check.Beside, lines)
 }
+
+// composedMember says the pull request is a member of a delivery group whose gate is the composed check's (novox/hq
+// ADR 0403 clauses 1 and 7): the group has two members or more and mesh-delivery says so on its line. The group is
+// found as siblingsFor finds it, by its head branch name, or, for a recheck that carries none, by the pull request's
+// repository and number — not by siblings, which name only what the check reads beside it.
+func composedMember(p link.PullUpdated, lines []groupsLine) bool {
+	own := strings.ToLower(p.Owner + "/" + p.Repo)
+	for _, l := range lines {
+		found := p.Head != "" && l.ID == p.Head
+		for _, m := range l.Details {
+			if p.Head == "" && p.Number != 0 && m.Number == p.Number && strings.ToLower(m.Repository) == own {
+				found = true
+			}
+		}
+		if found {
+			return l.ComposedGate && max(len(l.Details), len(l.Members)) >= 2
+		}
+	}
+	return false
+}
diff --git a/cmd/mesh-controller/checks.go b/cmd/mesh-controller/checks.go
index d501d49a..e20f7737 100644
--- a/cmd/mesh-controller/checks.go
+++ b/cmd/mesh-controller/checks.go
@@ -154,6 +154,11 @@ func (f following) PullUpdated(ctx context.Context, p link.PullUpdated) error {
 		return err
 	}
 	scope := pullScope(p, entries, read, edges)
+	// **A member of a group whose gate is the composed check's runs its repository's check alone** (novox/hq ADR 0403
+	// clause 1): mesh-delivery is asked once, and says so on the group's line. Told nothing, the pull request is
+	// checked alone, gate included (clause 6).
+	lines, groupsErr := groupsAsked(ctx, deliverySeatHeld(entries))
+	composed := groupsErr == nil && composedMember(p, lines)
 	// The change plan of the commit at hand (ADR 0238): what a merge of it would build and send, posted
 	// with the verdict whatever the verdict is.
 	plan := changePlanOf(p.Owner+"/"+p.Repo, p.Base, p.Commit, scope.Reach, entries, func(module string) (inventory.Upgrade, bool) {
@@ -162,6 +167,10 @@ func (f following) PullUpdated(ctx context.Context, p link.PullUpdated) error {
 	})
 	fmt.Print(planText(plan))
 	direct := directVerdict(p, plan)
+	if composed {
+		scope.Modules, scope.Dependents, scope.New, scope.Manifests = nil, nil, nil, nil
+		composedGate(&direct)
+	}
 	switch {
 	case !scope.gated() && !scope.Mesh:
 		fmt.Printf("%s/%s#%d (%.8s): %s, and the repository is not the mesh's: said, nothing run\n",
@@ -179,8 +188,9 @@ func (f following) PullUpdated(ctx context.Context, p link.PullUpdated) error {
 		return err
 	}
 	request.Check.Plan = &plan
+	request.Check.Composed = composed
 	// **The group's other open pull requests are read beside it** (novox/hq ADR 0382 §1).
-	withSiblings(ctx, &request, p, entries)
+	siblingsFrom(&request, p, entries, lines, groupsErr)
 	seat := buildSeatHeld(ctx)
 	ask, err := askOverOn(seat)
 	if err != nil {
@@ -194,6 +204,9 @@ func (f following) PullUpdated(ctx context.Context, p link.PullUpdated) error {
 	// issue 974): the check queue keeps one request a pull request, and a running check watches its key. Nothing is asked
 	// of the forge here (issue 726).
 	what := "its own merge-check.sh alone: " + noModuleTouched
+	if composed {
+		what = "its own merge-check.sh alone: the gate is its group's composed check's"
+	}
 	if scope.gated() {
 		what = fmt.Sprintf("the gate over %s (a merge would build %d module(s) in %d tier(s))",
 			strings.Join(append(append([]string{}, scope.Modules...), prefixedAll("new:", scope.New)...), ", "),
@@ -204,6 +217,20 @@ func (f following) PullUpdated(ctx context.Context, p link.PullUpdated) error {
 	return nil
 }
 
+// composedWords is what a group member's own verdict says of its gate layer (novox/hq ADR 0403 clause 1).
+const composedWords = "judged by its group's composed check"
+
+// gateComposed is a gate layer's verdict when no gate was run for the member alone: never a pass. Mesh-delivery reads it
+// as the composed check's to judge, and the forge's holder sets no mesh/merge-gate from it.
+const gateComposed = "composed"
+
+// composedGate says a group member's own verdict has no gate of its own: its gate layer, and the verdict that is
+// the gate's, read "composed" in place of a pass.
+func composedGate(c *link.Checked) {
+	c.Verdict, c.Summary = gateComposed, composedWords
+	c.Gate = &link.CheckLayer{Verdict: gateComposed, Summary: composedWords}
+}
+
 // directVerdict is the verdict of a change no build judges — it touches no module, and either the repository is not
 // the mesh's or the head holds no merge-check.sh. **It names the trunk commit it holds for** (novox/hq ADR 0323 §3):
 // the base branch's head the forge announced with the head, so the merge tool can weigh it against the trunk's head
@@ -518,6 +545,12 @@ func checkedOf(result link.BuildResult) link.Checked {
 		c.Gate = &link.CheckLayer{Verdict: c.Verdict, Summary: c.Summary}
 		c.RepoCheck = &link.CheckLayer{Verdict: c.Verdict, Summary: c.Summary}
 	}
+	// **A group member's own check has no gate of its own** (novox/hq ADR 0403 clause 1): what ran was the repository's
+	// check alone, and its gate layer is "composed", never a pass. A failure or an error stays what it was.
+	if result.Checked != nil && result.Checked.Composed && result.Check != nil && c.Gate != nil &&
+		(c.Gate.Verdict == "pass" || c.Gate.Verdict == "warning") {
+		composedGate(&c)
+	}
 	if result.Checked != nil && c.Gate != nil && len(c.Gate.Modules) == 0 {
 		c.Gate.Modules = append(append([]string{}, result.Checked.Modules...), prefixedAll("new:", result.Checked.New)...)
 	}
diff --git a/cmd/mesh-controller/composed_member_check_test.go b/cmd/mesh-controller/composed_member_check_test.go
new file mode 100644
index 00000000..f5bbc15b
--- /dev/null
+++ b/cmd/mesh-controller/composed_member_check_test.go
@@ -0,0 +1,68 @@
+//go:build integration
+
+package main
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/novox/mesh-controller/internal/catalogue"
+	"github.com/novox/mesh-controller/internal/inventory"
+	"github.com/novox/mesh-controller/internal/link"
+)
+
+// A member of a group whose gate is the composed check's is asked of the build seat with no module: its repository's
+// check alone (novox/hq ADR 0403 clause 1). With no word from mesh-delivery, or one that does not say the gate is
+// composed, it is checked alone with its gate (clause 6).
+
+func askedForMember(t *testing.T, answer []groupsLine, answerErr error) link.CheckRequest {
+	t.Helper()
+	open := aMesh(t)
+	ctx := t.Context()
+	js, _ := aBuildQueue(t)
+	servingBus.Store(js)
+	t.Cleanup(func() { servingBus.Store(nil) })
+	if err := open.inventory.RegisterModule(ctx, catalogue.Manifest{Module: "mesh-controller", Version: "1"},
+		inventory.Source{Repository: "novox/mesh-controller", Ref: "main", BuiltFrom: "c0", Head: "c0"}); err != nil {
+		t.Fatal(err)
+	}
+	was := groupsAsked
+	groupsAsked = func(context.Context, bool) ([]groupsLine, error) { return answer, answerErr }
+	t.Cleanup(func() { groupsAsked = was })
+	p := link.PullUpdated{Owner: "novox", Repo: "mesh-controller", Number: 346, Base: "main", Head: "feat/x", Commit: headController,
+		Paths: []string{"main.go"}, ModuleDirsSaid: true, MergeCheck: true, MergeCheckSaid: true}
+	if err := (following{open: open, oneShot: true}).PullUpdated(ctx, p); err != nil {
+		t.Fatal(err)
+	}
+	q, err := link.ReadQueue(ctx, js, link.TheBuildMachine)
+	if err != nil || len(q.Asks) != 1 {
+		t.Fatalf("asks %d: %v", len(q.Asks), err)
+	}
+	return *q.Asks[0].Request.Check
+}
+
+func TestAComposedMembersCheckIsItsRepositoryChecksAlone(t *testing.T) {
+	line := group("feat/x", member("novox/mesh-controller", 346, headController, "main", true), member("novox/mesh-catalog", 350, headHost, "main", true))
+	line.ComposedGate = true
+	c := askedForMember(t, []groupsLine{line}, nil)
+	if len(c.Modules) != 0 || len(c.New) != 0 || len(c.Dependents) != 0 || !c.Composed {
+		t.Fatalf("the member's check is asked as %+v; want no module and composed", c)
+	}
+}
+
+func TestAMemberOfAGroupOfAnOlderMeshDeliveryKeepsItsOwnGate(t *testing.T) {
+	line := group("feat/x", member("novox/mesh-controller", 346, headController, "main", true), member("novox/mesh-catalog", 350, headHost, "main", true))
+	c := askedForMember(t, []groupsLine{line}, nil)
+	if !strings.Contains(strings.Join(c.Modules, ","), "mesh-controller") || c.Composed {
+		t.Fatalf("an older mesh-delivery's member is asked as %+v; want its own gate", c)
+	}
+}
+
+func TestAMemberWhoseGroupCannotBeLearnedIsCheckedAloneWithItsGate(t *testing.T) {
+	c := askedForMember(t, nil, context.DeadlineExceeded)
+	if !strings.Contains(strings.Join(c.Modules, ","), "mesh-controller") || c.Composed ||
+		!strings.Contains(c.SiblingsUnknown, "reads no siblings") {
+		t.Fatalf("the member is asked as %+v; want its gate and why its siblings are unknown", c)
+	}
+}
diff --git a/cmd/mesh-controller/composed_verdict_test.go b/cmd/mesh-controller/composed_verdict_test.go
new file mode 100644
index 00000000..f85b9850
--- /dev/null
+++ b/cmd/mesh-controller/composed_verdict_test.go
@@ -0,0 +1,136 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"github.com/novox/mesh-controller/internal/catalogue"
+	"github.com/novox/mesh-controller/internal/inventory"
+	"github.com/novox/mesh-controller/internal/link"
+)
+
+// A delivery group's gate is the composed check's, and its members' own checks run their repository's check alone
+// (novox/hq ADR 0403 clauses 1 and 7). Pure: no store, no bus.
+
+// A member of a group whose line says composed_gate is a composed member; one whose group says nothing of it (an older
+// mesh-delivery), one of a group of a single pull request and a lone pull request are not.
+func TestAMemberOfAComposedGroupIsKnownByTheGroupsLine(t *testing.T) {
+	two := func(composed bool) groupsLine {
+		l := group("feat/x", member("novox/mesh-host", 114, headHost, "main", true), member("novox/mesh-controller", 346, headController, "main", true))
+		l.ComposedGate = composed
+		return l
+	}
+	p := link.PullUpdated{Owner: "novox", Repo: "mesh-host", Number: 114, Base: "main", Head: "feat/x", Commit: headHost}
+	recheck := link.PullUpdated{Owner: "novox", Repo: "mesh-host", Number: 114, Base: "main", Commit: headHost}
+	for name, c := range map[string]struct {
+		p     link.PullUpdated
+		lines []groupsLine
+		want  bool
+	}{
+		"composed":                 {p, []groupsLine{two(true)}, true},
+		"a recheck, by its number": {recheck, []groupsLine{two(true)}, true},
+		"an older mesh-delivery":   {p, []groupsLine{two(false)}, false},
+		"another group":            {p, []groupsLine{group("feat/y", member("novox/mesh-host", 1, headHost, "main", true))}, false},
+		"no group":                 {p, nil, false},
+	} {
+		if got := composedMember(c.p, c.lines); got != c.want {
+			t.Errorf("%s: composed %v, want %v", name, got, c.want)
+		}
+	}
+	alone := group("feat/x", member("novox/mesh-host", 114, headHost, "main", true))
+	alone.ComposedGate = true
+	if composedMember(p, []groupsLine{alone}) {
+		t.Error("a group of a single pull request is composed")
+	}
+}
+
+// A composed member's verdict never says its gate passed: the gate layer, and the verdict that is the gate's, read
+// "composed"; a failure or an error stays what it was.
+func TestAComposedMembersVerdictHasNoPassingGate(t *testing.T) {
+	asked := &link.CheckRequest{Owner: "novox", Repo: "mesh-host", Number: 114, Composed: true}
+	pass := link.BuildResult{ID: "b", Ref: headHost, Checked: asked, Check: &link.CheckOutcome{Verdict: "pass", Summary: "no module touched",
+		Gate: &link.CheckLayer{Verdict: "pass", Summary: "no module touched"}, RepoCheck: &link.CheckLayer{Verdict: "pass", Summary: "ok"}}}
+	c := checkedOf(pass)
+	if c.Gate == nil || c.Gate.Verdict != "composed" || c.Verdict != "composed" || c.RepoCheck == nil || c.RepoCheck.Verdict != "pass" {
+		t.Fatalf("the member's verdict says %+v gate %+v", c, c.Gate)
+	}
+	asked.Composed = false
+	if c := checkedOf(pass); c.Gate.Verdict != "pass" || c.Verdict != "pass" {
+		t.Fatalf("a member of no composed group has its own gate: %+v", c.Gate)
+	}
+	asked.Composed = true
+	failing := pass
+	failing.Check = &link.CheckOutcome{Verdict: "fail", Summary: "conflict", Gate: &link.CheckLayer{Verdict: "fail", Summary: "conflict"},
+		RepoCheck: &link.CheckLayer{Verdict: "fail", Summary: "conflict"}}
+	if c := checkedOf(failing); c.Gate.Verdict != "fail" || c.Verdict != "fail" {
+		t.Fatalf("a failure was read as composed: %+v", c.Gate)
+	}
+	broken := link.BuildResult{ID: "b", Ref: headHost, Checked: asked, Failed: "the facts snapshot cannot be read"}
+	if c := checkedOf(broken); c.Verdict != "error" || c.Gate.Verdict != "error" {
+		t.Fatalf("an error was read as composed: %+v", c)
+	}
+}
+
+// The composed verdict on the bus carries every member, each with its trunk commit, for the forge's holder to set each
+// member's mesh/merge-gate from it.
+func TestTheComposedVerdictCarriesEveryMember(t *testing.T) {
+	asked := &link.CheckRequest{Owner: "novox", Repo: "mesh-host", Number: 114, Group: "feat/x",
+		Members: []link.GroupMember{{Owner: "novox", Repo: "mesh-controller", Number: 346, Ref: headController}}}
+	c := checkedOf(link.BuildResult{ID: "g", Ref: headHost, Checked: asked, Check: &link.CheckOutcome{Verdict: "pass", Summary: "ok",
+		Trunk: "aaaaaaaaaaaa", Members: []link.CheckedMember{{Owner: "novox", Repo: "mesh-controller", Commit: headController[:12], Trunk: "bbbbbbbbbbbb"}}}})
+	body, _ := json.Marshal(c)
+	for _, want := range []string{`"group":"feat/x"`, `"members":[{"owner":"novox","repo":"mesh-host","number":114,"commit":"` + headHost + `","trunk":"aaaaaaaaaaaa"}`,
+		`{"owner":"novox","repo":"mesh-controller","number":346,"commit":"` + headController + `","trunk":"bbbbbbbbbbbb"}`} {
+		if !strings.Contains(string(body), want) {
+			t.Fatalf("the composed verdict lacks %s:\n%s", want, body)
+		}
+	}
+}
+
+// Members whose manifests order their modules in a cycle fail the composed check, naming every module and edge, and no
+// ask is made of the build seat.
+func TestAGroupInACycleFailsItsComposedCheckWithoutABuild(t *testing.T) {
+	members := []orderMember{
+		{ID: "novox/x@" + headHost[:12], Repository: "novox/x", Base: "main", Head: headHost, Number: 7, Paths: []string{"module.json"}},
+		{ID: "novox/y@" + headController[:12], Repository: "novox/y", Base: "main", Head: headController, Number: 9, Paths: []string{"module.json"}},
+	}
+	reach := map[string]orderReach{members[0].ID: {Moved: []string{"mx"}}, members[1].ID: {Moved: []string{"my"}}}
+	was, wasParent := manifestAt, parentOf
+	t.Cleanup(func() { manifestAt, parentOf = was, wasParent })
+	parentOf = func(context.Context, string, string, string) (string, error) { return "", nil }
+	manifestAt = func(_ context.Context, _, repo, _, ref string) (catalogue.Manifest, bool, error) {
+		if ref == "main" {
+			return catalogue.Manifest{}, false, nil // what the pull requests merge into holds no such manifest
+		}
+		if repo == "x" {
+			return catalogue.Manifest{Module: "mx", DefinesSeats: []catalogue.SeatDeclaration{{Name: "s", Serves: []catalogue.Verb{{Name: "a"}}}},
+				Invokes: []string{"seat:s.b"}}, true, nil
+		}
+		return catalogue.Manifest{Module: "my", DefinesSeats: []catalogue.SeatDeclaration{{Name: "s", Serves: []catalogue.Verb{{Name: "b"}}}},
+			Invokes: []string{"seat:s.a"}}, true, nil
+	}
+	c, cyclic, err := cycleVerdict(context.Background(), "feat/cycle", members, reach, []inventory.Edge(nil))
+	if err != nil || !cyclic {
+		t.Fatalf("no cycle found: %v", err)
+	}
+	if c.Verdict != "fail" || c.Group != "feat/cycle" || len(c.Members) != 2 || c.Gate == nil || c.Gate.Verdict != "fail" {
+		t.Fatalf("the verdict is %+v", c)
+	}
+	for _, w := range []string{"mx", "my", "s.a", "s.b"} {
+		if !strings.Contains(c.Summary, w) {
+			t.Errorf("the cycle does not name %s: %s", w, c.Summary)
+		}
+	}
+	// Members with no edge between them are no cycle.
+	manifestsReadMu.Lock()
+	clear(manifestsRead)
+	manifestsReadMu.Unlock()
+	manifestAt = func(context.Context, string, string, string, string) (catalogue.Manifest, bool, error) {
+		return catalogue.Manifest{}, false, nil
+	}
+	if _, cyclic, err := cycleVerdict(context.Background(), "feat/cycle", members, reach, nil); err != nil || cyclic {
+		t.Fatalf("a cycle where there is none: %v %v", cyclic, err)
+	}
+}
diff --git a/cmd/mesh-controller/delivery.go b/cmd/mesh-controller/delivery.go
index 33459102..3fc13979 100644
--- a/cmd/mesh-controller/delivery.go
+++ b/cmd/mesh-controller/delivery.go
@@ -1014,6 +1014,43 @@ func theGraph(ctx context.Context, inv *inventory.Inventory) ([]inventory.Entry,
 	return entries, read, edges, nil
 }
 
+// cycleVerdict is the failing verdict of a group whose modules are ordered in a cycle, and whether there is one: the
+// group's composed check, said without a build. The manifests' change is read from the forge; an answer it cannot give
+// is an error, never read as no cycle.
+func cycleVerdict(ctx context.Context, group string, members []orderMember, reach map[string]orderReach,
+	edges []inventory.Edge) (link.Checked, bool, error) {
+	changes, err := changesOf(ctx, changeSourcesOf(members))
+	if err != nil {
+		return link.Checked{}, false, fmt.Errorf("what the group's members say of their manifests cannot be read: %w", err)
+	}
+	var moved []string
+	for _, m := range members {
+		moved = appendNew(moved, reach[m.ID].Moved...)
+	}
+	said := orderEdges(moved, changes, edges).CycleSaid()
+	if said == "" {
+		return link.Checked{}, false, nil
+	}
+	first := members[0].pull()
+	c := link.Checked{ID: link.NewBuildID(time.Now()), Owner: first.Owner, Repo: first.Repo, Number: first.Number,
+		Commit: first.Commit, Verdict: "fail", Summary: said, Report: said, Group: group,
+		Gate: &link.CheckLayer{Verdict: "fail", Summary: said}}
+	for _, m := range members {
+		p := m.pull()
+		c.Members = append(c.Members, link.CheckedMember{Owner: p.Owner, Repo: p.Repo, Number: p.Number, Commit: p.Commit,
+			Trunk: twelve(p.BaseSHA)})
+	}
+	return c, true, nil
+}
+
+// twelve is a commit as twelve characters.
+func twelve(c string) string {
+	if len(c) > 12 {
+		return c[:12]
+	}
+	return c
+}
+
 // groupPrimary is the head a group's composed check is run from: the one moving the controller, which then
 // judges the group by itself; else the one moving the node-engine, whose validator judges; else the first.
 func groupPrimary(members []orderMember, reach map[string]orderReach) int {
@@ -1036,6 +1073,14 @@ func askGroupCheck(ctx context.Context, open *stores, group string, members []or
 		return "", err
 	}
 	reach := reachOfMembers(members, entries, read, edges)
+	// **A cycle of edges fails the group's composed check, naming every module and edge** (novox/hq ADR 0419 clause 6),
+	// before the build seat is asked: no composition of the heads has an order to be sent in.
+	if failing, cyclic, err := cycleVerdict(ctx, group, members, reach, edges); err != nil {
+		return "", err
+	} else if cyclic {
+		sayChecked(ctx, failing)
+		return failing.ID, nil
+	}
 	primary := groupPrimary(members, reach)
 	p := members[primary].pull()
 	scope := pullScope(p, entries, read, edges)
diff --git a/cmd/mesh-controller/group_one_batch_test.go b/cmd/mesh-controller/group_one_batch_test.go
index e792e40e..a4a55025 100644
--- a/cmd/mesh-controller/group_one_batch_test.go
+++ b/cmd/mesh-controller/group_one_batch_test.go
@@ -1,7 +1,8 @@
+//go:build integration
+
 package main
 
 import (
-	"context"
 	"strings"
 	"testing"
 	"time"
@@ -13,24 +14,6 @@ import (
 // member still to merge does not close by the merge window, however long that member takes, and a group with a
 // member of each kind is one batch whatever order its members are heard in.
 
-// groupStates stubs mesh-delivery's word on one group: its members and their states, which a test changes as the
-// members merge.
-func groupStates(t *testing.T, head string, states map[string]string) {
-	t.Helper()
-	was := deliveryGroupOf
-	deliveryGroupOf = func(_ context.Context, _ bool, asked string) ([]groupMember, bool, error) {
-		if asked != head {
-			return nil, false, nil
-		}
-		var members []groupMember
-		for repository, state := range states {
-			members = append(members, groupMember{Repository: repository, State: state})
-		}
-		return members, true, nil
-	}
-	t.Cleanup(func() { deliveryGroupOf = was })
-}
-
 func TestAGroupsBatchWaitsForItsLastMemberHoweverLongItTakes(t *testing.T) {
 	open := windowed(t)
 	asksWithPaths(t)
diff --git a/cmd/mesh-controller/group_wait.go b/cmd/mesh-controller/group_wait.go
index b2384cf8..c8a62f3f 100644
--- a/cmd/mesh-controller/group_wait.go
+++ b/cmd/mesh-controller/group_wait.go
@@ -44,6 +44,10 @@ type groupsLine struct {
 	ID      string       `json:"id"`
 	Members []string     `json:"members"`
 	Details []memberLine `json:"member_details,omitempty"`
+	// ComposedGate says the group's gate is the composed check's (novox/hq ADR 0403): a member's own check runs the
+	// repository's check alone. Said by a mesh-delivery that merges a group in one pass; absent from an older one, whose
+	// members keep their own gate.
+	ComposedGate bool `json:"composed_gate,omitempty"`
 }
 
 // memberLine is one member of a group, as `groups` says it beside its text.
diff --git a/cmd/mesh-controller/non_trunk_merge_test.go b/cmd/mesh-controller/non_trunk_merge_test.go
index 3e7c190d..be0ace88 100644
--- a/cmd/mesh-controller/non_trunk_merge_test.go
+++ b/cmd/mesh-controller/non_trunk_merge_test.go
@@ -1,3 +1,5 @@
+//go:build integration
+
 package main
 
 import (
diff --git a/cmd/mesh-controller/one_group_one_plan_test.go b/cmd/mesh-controller/one_group_one_plan_test.go
new file mode 100644
index 00000000..84c7af6c
--- /dev/null
+++ b/cmd/mesh-controller/one_group_one_plan_test.go
@@ -0,0 +1,177 @@
+//go:build integration
+
+package main
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/novox/mesh-controller/internal/catalogue"
+	"github.com/novox/mesh-controller/internal/inventory"
+)
+
+// Acceptance 1 of design 47, the controller's part: a feature across the controller and the catalogue with a new seat
+// verb is delivered as one group, with no `after:` line — its merges are one batch, each module is built once and sent
+// once, its commits are carried by that one plan, and the plan names the edge that placed each tier. The Approve and
+// the one-pass merge are mesh-delivery's.
+
+// manifestsHeld stubs the forge for a test: the manifest each (repository, path, commit) holds, and none anywhere else.
+func manifestsHeld(t *testing.T, held map[[3]string]catalogue.Manifest) {
+	t.Helper()
+	was, wasParent := manifestAt, parentOf
+	t.Cleanup(func() { manifestAt, parentOf = was, wasParent })
+	manifestsReadMu.Lock()
+	clear(manifestsRead)
+	manifestsReadMu.Unlock()
+	parentOf = func(context.Context, string, string, string) (string, error) { return "", nil }
+	manifestAt = func(_ context.Context, _, repo, file, ref string) (catalogue.Manifest, bool, error) {
+		m, ok := held[[3]string{repo, file, ref}]
+		return m, ok, nil
+	}
+}
+
+func TestAFeatureWithANewSeatVerbIsOneBatchAndOnePlanInOrderWithNoAfterLine(t *testing.T) {
+	for name, controllerFirst := range map[string]bool{"controller_first": true, "catalogue_first": false} {
+		t.Run(name, func(t *testing.T) {
+			open := windowed(t)
+			asked := asksWithPaths(t)
+			ctx := t.Context()
+			const head = "feat/one-group-one-plan"
+			// mesh-delivery holds its seat, so a catalogue plan would wait for its word; this plan carries the controller.
+			if err := open.inventory.RegisterModule(ctx, catalogue.Manifest{Module: "mesh-delivery", Version: "1",
+				Claims: []catalogue.Claim{{Name: catalogue.DeliverySeat, Scope: catalogue.ScopeMesh}}},
+				inventory.Source{Repository: "novox/mesh-catalog", Seat: "git", Path: "modules/mesh-delivery", Ref: "main",
+					BuiltFrom: "c0", Head: "c0"}); err != nil {
+				t.Fatal(err)
+			}
+			if _, err := open.inventory.Assign(ctx, "anchor", "mesh-delivery"); err != nil {
+				t.Fatal(err)
+			}
+			controller := fromHead(repoMerge("mesh-controller", "k1", t0), head)
+			controller.Paths = []string{"module.json", "cmd/mesh-controller/main.go"}
+			catalog := fromHead(catalogueMerge("cat1aaaaaaaa", "app", t0), head)
+			manifestsHeld(t, map[[3]string]catalogue.Manifest{
+				{"mesh-controller", "module.json", "k1"}: {Module: "mesh-controller",
+					DefinesSeats: []catalogue.SeatDeclaration{{Name: "seat", Serves: []catalogue.Verb{{Name: "verb"}}}}},
+				{"mesh-catalog", "modules/app/module.json", "cat1aaaaaaaa"}: {Module: "app", Invokes: []string{"seat:seat.verb"}},
+			})
+			states := map[string]string{"novox/mesh-controller": "ready", "novox/mesh-catalog": "ready"}
+			groupStates(t, head, states)
+			first, second := controller, catalog
+			if !controllerFirst {
+				first, second = catalog, controller
+			}
+			// The first member merges; the group waits for the second, however long it takes.
+			hear(t, open, first, t0)
+			cutAt(t, open, t0.Add(30*time.Minute))
+			if ws, bs := walks(t, open); len(ws) != 0 || len(bs) != 1 {
+				t.Fatalf("a member of a group alone: %d walk(s), %d batch(es)", len(ws), len(bs))
+			}
+			states["novox/"+second.Repo] = "merged"
+			second.MergedAt = t0.Add(30 * time.Minute).Format(time.RFC3339Nano)
+			hear(t, open, second, t0.Add(30*time.Minute))
+			cutAt(t, open, t0.Add(30*time.Minute+90*time.Second))
+			ws, bs := walks(t, open)
+			if len(ws) != 1 || len(bs) != 0 {
+				t.Fatalf("after the window: %d walk(s), %d batch(es); want exactly one plan", len(ws), len(bs))
+			}
+			plan := ws[0]
+			if plan.CommitOf("novox/mesh-controller") != "k1" || plan.CommitOf("novox/mesh-catalog") != "cat1aaaaaaaa" {
+				t.Fatalf("the plan carries %+v", plan.Commits)
+			}
+			if len(plan.Tiers) != 2 || strings.Join(plan.Tiers[0], ",") != "mesh-controller" || strings.Join(plan.Tiers[1], ",") != "app" {
+				t.Fatalf("the plan's tiers are %v; want the controller, then the caller of its verb", plan.Tiers)
+			}
+			if placed := plan.Modules["app"].Placed; !strings.Contains(placed, "verb before caller: seat.verb") ||
+				!strings.Contains(placed, "after mesh-controller") {
+				t.Fatalf("the plan does not name the edge that placed the caller: %q", placed)
+			}
+			if plan.Modules["mesh-controller"].Placed != "" {
+				t.Fatalf("the first tier is placed by %q", plan.Modules["mesh-controller"].Placed)
+			}
+			if plan.Delivery != nil && (plan.Delivery.Awaits != "" || plan.Waiting()) {
+				t.Fatalf("a plan carrying the controller waits for %q's word", plan.Delivery.Awaits)
+			}
+			if plan.Modules["mesh-controller"].Build == "" || len(*asked) != 1 {
+				t.Fatalf("the first tier is asked once: build %q, %d ask(s) %v", plan.Modules["mesh-controller"].Build, len(*asked), *asked)
+			}
+			// Every merge is answered by that one plan.
+			for _, repository := range []string{"novox/mesh-controller", "novox/mesh-catalog"} {
+				merges, err := open.inventory.MergesOf(ctx, plan.ID)
+				if err != nil || len(merges) != 2 {
+					t.Fatalf("the plan answers %d merge(s) of %s: %v", len(merges), repository, err)
+				}
+			}
+		})
+	}
+}
+
+// Issue 1049: a move delivered half before its second merge. The controller adds a module the catalogue removes, in one
+// group: the merges are one batch and one plan in either order, the module is built once and from the controller's
+// repository, and the catalogue's removal does not forget it.
+func TestAMoveOfAModuleAcrossTwoRepositoriesIsOnePlanAndBuildsItOnceFromTheNewOne(t *testing.T) {
+	for name, controllerFirst := range map[string]bool{"controller_first": true, "catalogue_first": false} {
+		t.Run(name, func(t *testing.T) {
+			open := windowed(t)
+			asked := asksWithPaths(t)
+			ctx := t.Context()
+			const head = "feat/whole-modules"
+			// The module runs on a machine from the catalogue's repository, so its removal there cannot forget it.
+			if err := open.inventory.RegisterModule(ctx, catalogue.Manifest{Module: "route-proxy", Version: "1"},
+				inventory.Source{Repository: "novox/mesh-catalog", Seat: "git", Path: "modules/route-proxy", Ref: "main",
+					BuiltFrom: "c0", Head: "c0"}); err != nil {
+				t.Fatal(err)
+			}
+			if _, err := open.inventory.Assign(ctx, "anchor", "route-proxy"); err != nil {
+				t.Fatal(err)
+			}
+			manifestsHeld(t, nil)
+			controller := fromHead(repoMerge("mesh-controller", "k1", t0), head)
+			controller.Paths = []string{"modules/route-proxy/module.json", "modules/route-proxy/main.go"}
+			controller.ModuleDirs, controller.ModuleDirsSaid = []string{"modules/route-proxy"}, true
+			catalog := fromHead(catalogueMerge("cat1aaaaaaaa", "route-proxy", t0), head)
+			catalog.Removed = []string{"modules/route-proxy/module.json"}
+			catalog.ModuleDirs, catalog.ModuleDirsSaid = nil, true
+			states := map[string]string{"novox/mesh-controller": "ready", "novox/mesh-catalog": "ready"}
+			groupStates(t, head, states)
+			first, second := controller, catalog
+			if !controllerFirst {
+				first, second = catalog, controller
+			}
+			hear(t, open, first, t0)
+			states["novox/"+second.Repo] = "merged"
+			second.MergedAt = t0.Add(20 * time.Second).Format(time.RFC3339Nano)
+			hear(t, open, second, t0.Add(20*time.Second))
+			cutAt(t, open, t0.Add(20*time.Second+90*time.Second))
+			ws, bs := walks(t, open)
+			if len(ws) != 1 || len(bs) != 0 {
+				t.Fatalf("a move: %d walk(s), %d batch(es); want exactly one plan", len(ws), len(bs))
+			}
+			var fromController int
+			for _, a := range *asked {
+				if strings.Contains(a[0], "mesh-controller") && a[1] == "modules/route-proxy" {
+					fromController++
+				}
+				if strings.Contains(a[0], "mesh-catalog") && a[1] == "modules/route-proxy" {
+					t.Errorf("route-proxy was built from the repository it left: %v", a)
+				}
+			}
+			if fromController != 1 {
+				t.Fatalf("route-proxy was built %d time(s) from the controller's repository: %v", fromController, *asked)
+			}
+			entries, err := open.inventory.Catalogued(ctx)
+			if err != nil {
+				t.Fatal(err)
+			}
+			kept := false
+			for _, e := range entries {
+				kept = kept || e.Manifest.Module == "route-proxy"
+			}
+			if !kept {
+				t.Fatal("the catalogue's removal forgot route-proxy, which a machine runs")
+			}
+		})
+	}
+}
diff --git a/internal/catalogue/delivery_seat.go b/internal/catalogue/delivery_seat.go
index 19a2d51b..840c4916 100644
--- a/internal/catalogue/delivery_seat.go
+++ b/internal/catalogue/delivery_seat.go
@@ -84,15 +84,6 @@ func deliveryVerbs() []Verb {
 				"dry":        "\"true\": what it would retire, changing nothing"}, []string{"why"}, "dry"),
 			// Added after the seat's holder shipped (novox/hq issue 313): optional until mesh-delivery serves it.
 			Optional: true},
-		{Name: "mark-ready", Description: "A reviewer's word that a delivery's head is approved: the holder puts the " +
-			"label mesh/ready on its pull request and then writes \"ready at <head>\", the order the forge counts, " +
-			"as the mesh's own forge account, naming who reviewed it and why. Refused when the delivery's commit is " +
-			"no longer its pull request's head. mesh-delivery then merges it once its checks pass (novox/hq ADR 0364).",
-			Input: schema(map[string]string{"id": "the delivery's id (owner/repository@commit): the head reviewed",
-				"reviewed-by": "who reviewed it, as who@node", "why": "the review's verdict in a line"},
-				[]string{"id", "reviewed-by", "why"}),
-			// Added after the seat's holder shipped (novox/hq issue 913): optional until mesh-delivery serves it.
-			Optional: true},
 	}
 }
 
diff --git a/internal/catalogue/delivery_seat_test.go b/internal/catalogue/delivery_seat_test.go
index 783ec06e..5fe8daf2 100644
--- a/internal/catalogue/delivery_seat_test.go
+++ b/internal/catalogue/delivery_seat_test.go
@@ -133,32 +133,3 @@ func TestTheDeliverySeatPromisesTimesOptionally(t *testing.T) {
 		t.Fatalf("a holder serving times: %v", err)
 	}
 }
-
-// The seat marks a reviewed head ready (novox/hq issue 913): `mark-ready`, with the delivery's id, who reviewed it
-// and why, so a reviewer marks a pull request through one audited verb, label and comment in the order the forge
-// counts, instead of two raw forge calls. Added after the holder shipped, it is optional.
-func TestTheDeliverySeatPromisesMarkReadyOptionally(t *testing.T) {
-	seat, _ := SeatNamed(DeliverySeat)
-	var mark *Verb
-	for i := range seat.Serves {
-		if seat.Serves[i].Name == "mark-ready" {
-			mark = &seat.Serves[i]
-		}
-	}
-	if mark == nil || !mark.Optional {
-		t.Fatalf("the delivery seat promises %v, mark-ready optionally", VerbNames(seat.Serves))
-	}
-	if req, _ := mark.Input["required"].([]string); !reflect.DeepEqual(req, []string{"id", "reviewed-by", "why"}) {
-		t.Errorf("mark-ready requires %v, wanted id, reviewed-by and why", req)
-	}
-	var without []string
-	for _, v := range VerbNames(seat.Serves) {
-		if v != "mark-ready" {
-			without = append(without, v)
-		}
-	}
-	m := Manifest{Module: "mesh-delivery", Claims: []Claim{{Name: DeliverySeat, Scope: ScopeMesh, Serves: without}}}
-	if err := CanHold(m, seat); err != nil {
-		t.Fatalf("a holder without mark-ready yet: %v", err)
-	}
-}
diff --git a/internal/link/build.go b/internal/link/build.go
index 6ba3231f..ffccf720 100644
--- a/internal/link/build.go
+++ b/internal/link/build.go
@@ -150,6 +150,9 @@ type CheckRequest struct {
 	Trunk string `json:"trunk,omitempty"`
 	// Ready says the pull request is marked ready (ADR 0406 §3): its check is queued before every other check.
 	Ready bool `json:"ready,omitempty"`
+	// Composed says the pull request is a member of a delivery group whose gate is the composed check's (novox/hq ADR
+	// 0403 clause 1): this check runs the repository's own merge-check.sh alone, and its gate layer is not run.
+	Composed bool `json:"composed,omitempty"`
 	// Paths are the files the pull request changes, for the width of its rebuild.
 	Paths []string `json:"paths,omitempty"`
 	// Beside are the repositories the check reads next to this one, each cloned at the ref given — the
diff --git a/internal/link/events.go b/internal/link/events.go
index 883ef587..84b41651 100644
--- a/internal/link/events.go
+++ b/internal/link/events.go
@@ -294,8 +294,9 @@ type Checked struct {
 	// and send, posted with the verdict.
 	Plan *ChangePlan `json:"plan,omitempty"`
 	// Group is set on a delivery group's composed check (novox/hq ADR 0239): every member's head composed
-	// together as one future state. Members are the heads judged. A forge's holder sets no merge-gate
-	// status from it — the group's verdict is its owner's, mesh-delivery, to say on each member's head.
+	// together as one future state. Members are the heads judged, each with the trunk commit it was merged into. **The
+	// forge's holder sets every member's mesh/merge-gate from it** (novox/hq ADR 0403 clauses 1 and 5): the group's
+	// verdict is each member's gate, and a member's own verdict, whose gate layer is "composed", sets none.
 	Group   string          `json:"group,omitempty"`
 	Members []CheckedMember `json:"members,omitempty"`
 	// Trunk is the trunk commit the head was merged into and judged as, twelve characters (novox/hq ADR 0323