diff --git a/internal/link/access_act_test.go b/internal/link/access_act_test.go
index 17278bb..32baa52 100644
--- a/internal/link/access_act_test.go
+++ b/internal/link/access_act_test.go
@@ -7,8 +7,8 @@ import (
 	"testing"
 	"time"
 
-	occ "git.novox.be/novox/mesh-contracts/go/clients/operatorchannelclient"
-	oc "git.novox.be/novox/mesh-contracts/go/seats/operatorchannel"
+	occ "git.novox.be/novox/mesh-contracts/operator-and-conversation/go/clients/operatorchannelclient"
+	oc "git.novox.be/novox/mesh-contracts/operator-and-conversation/go/seats/operatorchannel"
 	stdio "git.novox.be/novox/mesh-sdk/go"
 )
 
diff --git a/internal/link/engineseat.go b/internal/link/engineseat.go
index 4d47ace..ad7ca02 100644
--- a/internal/link/engineseat.go
+++ b/internal/link/engineseat.go
@@ -10,7 +10,7 @@ import (
 	"time"
 
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
-	oc "git.novox.be/novox/mesh-contracts/go/seats/operatorchannel"
+	oc "git.novox.be/novox/mesh-contracts/operator-and-conversation/go/seats/operatorchannel"
 	stdio "git.novox.be/novox/mesh-sdk/go"
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
 	"github.com/nats-io/nats.go"
diff --git a/internal/link/handacts.go b/internal/link/handacts.go
index bb0cf84..6592603 100644
--- a/internal/link/handacts.go
+++ b/internal/link/handacts.go
@@ -13,9 +13,9 @@ import (
 	"sync"
 	"time"
 
-	occ "git.novox.be/novox/mesh-contracts/go/clients/operatorchannelclient"
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
-	oc "git.novox.be/novox/mesh-contracts/go/seats/operatorchannel"
+	occ "git.novox.be/novox/mesh-contracts/operator-and-conversation/go/clients/operatorchannelclient"
+	oc "git.novox.be/novox/mesh-contracts/operator-and-conversation/go/seats/operatorchannel"
 	stdio "git.novox.be/novox/mesh-sdk/go"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
@@ -58,6 +58,13 @@ const (
 	ActSeatListAgain = "seat-list-again"
 )
 
+// SeatListCallers are who may call the engine's two seat-list verbs: every operator's session and the healers (novox/hq
+// ADR 0636 §7, the node-engine seat's definition: the operator and the healers).
+var SeatListCallers = stdio.VerbCallers{
+	ActSeatList:      {stdio.AnyPerson, "mesh-healers"},
+	ActSeatListAgain: {stdio.AnyPerson, "mesh-healers"},
+}
+
 // The states of an act: asked, done and refused are also the seat's events.
 const (
 	HandAsked    = nodeengine.EventAsked
@@ -228,11 +235,17 @@ func (h *HandActs) Call(c EngineCall) (any, error) {
 		}
 		return h.Compose(arg("module"))
 	case ActSeatList:
+		if err := SeatListCallers.Allowed(c.Verb, c.Caller); err != nil {
+			return nil, err
+		}
 		if h.SeatList == nil {
 			return nil, errors.New("this engine reads no seat list yet: its node agent has not started")
 		}
 		return h.SeatList()
 	case ActSeatListAgain:
+		if err := SeatListCallers.Allowed(c.Verb, c.Caller); err != nil {
+			return nil, err
+		}
 		if h.SeatListAgain == nil {
 			return nil, errors.New("this engine reads no seat list yet: its node agent has not started")
 		}
diff --git a/internal/link/handover_test.go b/internal/link/handover_test.go
index 6dd537a..54665ae 100644
--- a/internal/link/handover_test.go
+++ b/internal/link/handover_test.go
@@ -264,7 +264,9 @@ func TestALinkThatHearsHandOversIsGivenTheQueues(t *testing.T) {
 			Composition: func(module, digest string, diff bool) (any, error) {
 				return map[string]any{"module": module, "digest": digest, "diff": diff}, nil
 			},
-			Compose: func(module string) (any, error) { return map[string]any{"composed": true, "retried": module}, nil },
+			Compose:       func(module string) (any, error) { return map[string]any{"composed": true, "retried": module}, nil },
+			SeatList:      func() (any, error) { return map[string]any{"held": true}, nil },
+			SeatListAgain: func() (any, error) { return map[string]any{"read": true}, nil },
 			// ADR 0618 §3: what this engine states it reads, and when it last stated it.
 			ManifestReads: func() ([]string, time.Time) {
 				return []string{"form:a", "seat:b"}, time.Date(2026, 11, 4, 10, 0, 0, 0, time.UTC)
@@ -299,6 +301,12 @@ func TestALinkThatHearsHandOversIsGivenTheQueues(t *testing.T) {
 			{"packages", EngineToolSubject("packages", "n1") + " " + `{"write":true}`, `"key":null,"wrote":true`},
 			{"packages", EngineToolSubject("packages", "n1") + " " + `{"write":"true"}`, `"note":"the engine has written no key for this node yet`},
 			{"manifest-reads", EngineToolSubject("manifest-reads", "n1"), `"manifest-reads":["form:a","seat:b"],"node":"n1","stated-at":"2026-11-04T10:00:00Z","v":1`},
+			// ADR 0636 §7: the seat-list verbs answer every operator's session and the healers, no other module.
+			{"seat-list", "mesh.seat.node-engine.call.seat-list.n1.person~jochen", `"held":true`},
+			{"seat-list-again", "mesh.seat.node-engine.call.seat-list-again.n1.person~jochen", `"read":true`},
+			{"seat-list-again", "mesh.seat.node-engine.call.seat-list-again.n1.ace~mesh-healers", `"read":true`},
+			{"seat-list-again", "mesh.seat.node-engine.call.seat-list-again.n1.ace~messenger", `not on the holder's caller list for seat-list-again`},
+			{"seat-list-again", EngineToolSubject("seat-list-again", "n1"), `no caller the tool runner proved`},
 			{"unserved", "mesh.seat.node-engine.call.unserved.n1.x", `"error":"the node seat node-engine serves no verb \"unserved\""`},
 		} {
 			subject, body, ok := strings.Cut(row.subject, " ")
diff --git a/internal/link/run.go b/internal/link/run.go
index 96c9bd8..fd13c56 100644
--- a/internal/link/run.go
+++ b/internal/link/run.go
@@ -7,7 +7,7 @@ import (
 	"fmt"
 	"time"
 
-	occ "git.novox.be/novox/mesh-contracts/go/clients/operatorchannelclient"
+	occ "git.novox.be/novox/mesh-contracts/operator-and-conversation/go/clients/operatorchannelclient"
 )
 
 // Membership is what a node needs to reach its mesh again, held by the caller.