diff --git a/CHANGELOG.md b/CHANGELOG.md
index df7a1c8..5dee3ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,29 @@
+## Unreleased — „Reboot guest" from the hub (D65 = A): `reboot_guest` joins the agent's closed list
+
+- **D65 = A (operator ruling 2026-10-29 15:50; felhom.eu `04` §6.1, `03`).** The agent's closed operator-action list is
+  now `restart_controller` and `reboot_guest` (arg: the vmid). No signature: a reboot destroys nothing. The act is the
+  existing guest-reboot path (`pct reboot <vmid>` of THAT guest over the existing exact grant) — never the host.
+- **Guards** (each refuses with the reason; nothing is called, no record is written): a guest this agent did not
+  provision, not running, locked, or parked; the host-wide heavy-operation gate held (a backup of any tier the agent
+  runs, a restore test, an OS step — the reboot HOLDS the gate until the guest is up again); `jobBlocker` (an agent
+  backup job, a controller swap, a drive or NAS job, an escrow ceremony, a vzdump of the guest); the CONTROLLER busy —
+  its `data/ctl/busy` file (a backup, a restore, an off-site run, an app update), fresh within 90 s; a stale file is a
+  controller that stopped writing, not a busy one; any read failure but „no such file" refuses (fail closed); at most
+  ONE reboot per hour per guest (`<guests>/<vmid>/operator-reboot.json`, on disk — it survives an agent restart); the
+  operator restart's brake (a refusal in force refuses a reboot; a reboot counts as one of the 3 restarts in 15 minutes).
+- **During the reboot** the guest-power watchdog and the controller supervisor leave the guest alone (`rebootInFlight`):
+  a racing start would fail the reboot's own start half.
+- **The result** says both times from the press: „rebooted; the guest was up after 41 s, the controller answered after
+  63 s" — or `failed`, said plainly. The record is written BEFORE the reboot; the new self-scoped
+  `GET /guest/operator-reboot` gives it to the controller for one day, for the household's line „Felhom support
+  restarted your box at <time>".
+- **One new sudo vector** (configs/ changed → the signed config bundle): `pct exec <vmid> -- cat
+  /var/lib/docker/volumes/felhom-controller-data/_data/data/ctl/busy` — read-only, one fixed path, in
+  `FELHOM_CONTROLLERSWAP`; capability `controller-busy-read` (not critical: without it, every reboot press is refused).
+- Tests `TestOpReboot_*` (the times + the record + the gate given back; 13 guard cases; a stale busy file; once per hour
+  across an agent restart; the brake counting a reboot; a failed reboot; the watchdogs leaving the guest alone; the
+  notice expiring after a day) and `TestOpActions_AgentClosedList` — each seen failing by a mutation (19 mutants).
+
 ## v0.169.0 (2026-10-29) — „Restart controller" from the hub (the agent's own closed list); the unresponsive controller ALARM (R-1344) — RELEASED (release-agent.sh from a clean clone of `637c92c`; agent sha256 fc066de640007038ecfaed6a23e4301a27fc486f1d7851c36177acdd26c2df61, bundle 3ca33f9cbab3bdd4c1b7f8ac90aa21e43b64209f1cb45c77ac72b3405956041b; binary-only signed updates committed on demo-felhom, Tester 1, demo-hp) — **VOUCHED by the operator 2026-10-29 14:06:09 CET**; Day-0 pin set (D50). Live on Tester 1: four presses (one with the controller stopped, the fourth refused by the brake)
 
 - **Operator actions for the agent (operator brief 2026-10-29, Part 1; felhom.eu `04` §6.1).** The host-report reply may
diff --git a/configs/felhom-agent.sudoers b/configs/felhom-agent.sudoers
index 0f9d8a4..d3fb039 100644
--- a/configs/felhom-agent.sudoers
+++ b/configs/felhom-agent.sudoers
@@ -139,6 +139,8 @@ Cmnd_Alias FELHOM_INTERMEDIARY = \
 #   docker inspect -f *         — container running/health/image (read-only; `*` spans the -f template
 #                                 + container across spaces, spike-confirmed)
 #   systemctl restart <fixed unit> — re-run the golden's bootstrap (the only state change)
+#   cat <the controller's busy file> — D65 (2026-10-29): before an operator reboot of the guest, is the controller
+#                                 running a backup, a restore, an off-site run or an app update? (read-only, one path)
 #   felhom-priv-apply controller-image <vmid> — WRITE the ref (R-861 (a) A1, `09` §3 decision 165): the ref goes on
 #                                 STDIN to the ROOT wrapper, which requires our registry + repository + an x.y.z tag
 #                                 and writes the guest file itself. The agent's own `tee` grant is GONE: before, a
@@ -149,6 +151,7 @@ Cmnd_Alias FELHOM_CONTROLLERSWAP = \
   /usr/sbin/pct ^exec [0-9]+ -- docker image inspect gitea\.dooplex\.hu/admin/felhom-controller\:[0-9]+\.[0-9]+\.[0-9]+$, \
   /usr/sbin/pct ^exec [0-9]+ -- docker inspect -f .+ (felhom-controller|cloudflared)$, \
   /usr/sbin/pct ^exec [0-9]+ -- systemctl restart felhom-controller-bootstrap\.service$, \
+  /usr/sbin/pct ^exec [0-9]+ -- cat /var/lib/docker/volumes/felhom-controller-data/_data/data/ctl/busy$, \
   /usr/local/sbin/felhom-priv-apply ^controller-image [0-9]+$
 
 # Stale-lock recovery (F2-b, v0.49.0). A host reboot DURING a vzdump backup leaves the guest with a
diff --git a/internal/capability/manifest.go b/internal/capability/manifest.go
index 06035cf..fd825b1 100644
--- a/internal/capability/manifest.go
+++ b/internal/capability/manifest.go
@@ -151,6 +151,7 @@ var manifest = []Capability{
 	{"controllerswap-read", "controller-swap / managed auto-update", "/usr/sbin/pct", []string{"exec", "9201", "--", "cat", "/etc/felhom-controller-image"}, true, ""},
 	{"controllerswap-image-inspect", "controller-swap / managed auto-update", "/usr/sbin/pct", []string{"exec", "9201", "--", "docker", "image", "inspect", "gitea.dooplex.hu/admin/felhom-controller:0.0.0"}, true, ""},
 	{"controllerswap-inspect", "controller-swap / managed auto-update", "/usr/sbin/pct", []string{"exec", "9201", "--", "docker", "inspect", "-f", "{{.State.Running}}", "felhom-controller"}, true, ""},
+	{"controller-busy-read", "operator guest reboot (D65)", "/usr/sbin/pct", []string{"exec", "9201", "--", "cat", "/var/lib/docker/volumes/felhom-controller-data/_data/data/ctl/busy"}, false, ""},
 	{"controllerswap-restart", "controller-swap / managed auto-update", "/usr/sbin/pct", []string{"exec", "9201", "--", "systemctl", "restart", "felhom-controller-bootstrap.service"}, true, ""},
 	// R-861 (a) A1 (decision 165): the write goes through the ROOT verb that checks the ref; the agent has no `tee` grant.
 	{"controllerswap-write", "controller-swap / managed auto-update", "/usr/local/sbin/felhom-priv-apply", []string{"controller-image", "9201"}, true, ""},
diff --git a/internal/localapi/controllersupervisor.go b/internal/localapi/controllersupervisor.go
index d5c52c9..b66a8f4 100644
--- a/internal/localapi/controllersupervisor.go
+++ b/internal/localapi/controllersupervisor.go
@@ -254,6 +254,10 @@ func (s *Server) ControllerSupervisorTick(ctx context.Context) {
 		if !s.provisionedGuest(g.VMID) {
 			continue
 		}
+		if s.rebooting(g.VMID) { // D65: the operator's reboot owns the guest until it is up again
+			s.resetNotRunning(g.VMID)
+			continue
+		}
 		evaluated++
 		if !s.superviseOneController(ctx, g.VMID, g.Status) {
 			down++
diff --git a/internal/localapi/guestpower.go b/internal/localapi/guestpower.go
index 4376ba4..2fae369 100644
--- a/internal/localapi/guestpower.go
+++ b/internal/localapi/guestpower.go
@@ -152,6 +152,11 @@ func (s *Server) recoverOneStoppedGuest(ctx context.Context, g proxmox.Guest) {
 		s.forgetGuestPower(g.VMID) // healthy again: clear any attempt history
 		return
 	}
+	// D65: a guest the operator's reboot has down for a moment is pct reboot's to start, not ours (a racing start
+	// would fail the reboot's own start half).
+	if s.rebooting(g.VMID) {
+		return
+	}
 
 	lock, onboot, err := s.staleLock.Lock(ctx, g.VMID)
 	if err != nil {
diff --git a/internal/localapi/opactions.go b/internal/localapi/opactions.go
index 9eba28f..a029bf2 100644
--- a/internal/localapi/opactions.go
+++ b/internal/localapi/opactions.go
@@ -20,7 +20,7 @@ import (
 // the next report answers `operator_action_results: [{id, outcome, message}]` — the agent asks for that report at once.
 // The result is re-sent until the reply stops listing the id.
 //
-// THE LIST IS CLOSED: one verb, restart_controller <vmid>. Anything else — a verb, a vmid that does not parse, a guest
+// THE LIST IS CLOSED: two verbs, restart_controller <vmid> and (D65 = A, 2026-10-29) reboot_guest <vmid> (opreboot.go). Anything else — a verb, a vmid that does not parse, a guest
 // this agent did not provision — is refused and NOTHING is called. Pinned by TestOpActions_AgentClosedList.
 //
 // THE ACT is the supervisor's own (controllersupervisor.go): `systemctl restart felhom-controller-bootstrap.service` in
@@ -31,7 +31,7 @@ import (
 // controller. Every decision is one `audit:` line (the customer-visible audit form of reconcile.SlogAudit).
 
 const (
-	// OpRestartController is the agent's one operator verb.
+	// OpRestartController is the agent's first operator verb.
 	OpRestartController = "restart_controller"
 
 	opOutcomeDone    = "done"
@@ -52,7 +52,7 @@ const (
 )
 
 // operatorActionNames is THE agent's closed list. Adding an entry fails TestOpActions_AgentClosedList by design.
-var operatorActionNames = []string{OpRestartController}
+var operatorActionNames = []string{OpRestartController, OpRebootGuest}
 
 // OperatorActionNames returns the closed list (sorted copy).
 func OperatorActionNames() []string {
@@ -120,11 +120,18 @@ func (s *Server) OperatorActionResults() []hub.OperatorActionResult {
 }
 
 func (s *Server) runOperatorAction(a hub.OperatorAction) {
-	ctx, cancel := context.WithTimeout(context.Background(), s.opWait()+time.Minute)
+	limit := s.opWait() + time.Minute
+	if a.Action == OpRebootGuest {
+		limit += opRebootTimeout
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), limit)
 	defer cancel()
-	outcome, msg := opOutcomeRefused, fmt.Sprintf("unknown action %q — the agent's list holds restart_controller only", a.Action)
-	if a.Action == OpRestartController {
+	outcome, msg := opOutcomeRefused, fmt.Sprintf("unknown action %q — the agent's list holds restart_controller and reboot_guest only", a.Action)
+	switch a.Action {
+	case OpRestartController:
 		outcome, msg = s.operatorRestartController(ctx, a.ID, a.Arg)
+	case OpRebootGuest:
+		outcome, msg = s.operatorRebootGuest(ctx, a.ID, a.Arg)
 	}
 	s.logger.Warn("audit: operator action", "id", a.ID, "action", a.Action, "arg", a.Arg, "by", "the operator via the hub",
 		"outcome", outcome, "message", msg)
diff --git a/internal/localapi/opactions_test.go b/internal/localapi/opactions_test.go
index 0930a15..e1efc0f 100644
--- a/internal/localapi/opactions_test.go
+++ b/internal/localapi/opactions_test.go
@@ -71,7 +71,7 @@ func waitResult(t *testing.T, s *Server, id int64) hub.OperatorActionResult {
 
 // RED-PROOF: seen failing before the list existed (build failure, then the names).
 func TestOpActions_AgentClosedList(t *testing.T) {
-	if got, want := OperatorActionNames(), []string{"restart_controller"}; !reflect.DeepEqual(got, want) {
+	if got, want := OperatorActionNames(), []string{"reboot_guest", "restart_controller"}; !reflect.DeepEqual(got, want) {
 		t.Fatalf("the agent's operator actions = %v, want exactly %v — a new verb needs the operator's word", got, want)
 	}
 }
@@ -80,7 +80,7 @@ func TestOpActions_AgentClosedList(t *testing.T) {
 func TestOpActions_UnknownOrBadArgIsRefused(t *testing.T) {
 	s, ex, _, _, _, _ := opServer(t, "running")
 	s.OnEnvelope(context.Background(), env(
-		hub.OperatorAction{ID: 1, Action: "reboot_guest", Arg: "9201"},
+		hub.OperatorAction{ID: 1, Action: "reboot_host", Arg: "9201"}, // never on the list: only the guest is rebooted
 		hub.OperatorAction{ID: 2, Action: "restart_controller", Arg: "abc"},
 		hub.OperatorAction{ID: 3, Action: "restart_controller", Arg: "9202"}, // not provisioned here
 	))
diff --git a/internal/localapi/opreboot.go b/internal/localapi/opreboot.go
new file mode 100644
index 0000000..70fd048
--- /dev/null
+++ b/internal/localapi/opreboot.go
@@ -0,0 +1,328 @@
+package localapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// reboot_guest — the operator reboots a guest from the hub (D65 = A, operator ruling 2026-10-29 15:50; felhom.eu `04`
+// §6.1, `03`). No signature: a reboot destroys nothing (`03`, „healing … non-destructive by construction").
+//
+// WHY: a stuck Docker or a stuck network inside the box is out of reach of „Restart controller" — that restarts one
+// container. The reboot is the existing guest-reboot path (`pct reboot <vmid>`, the household's „A Felhom
+// újraindítása", the same exact sudo vector) — of THAT guest, never the host.
+//
+// THE GUARDS (each refuses with the reason in the result; nothing is called):
+//   - the guest is not one this agent provisioned, is not running, is locked, or its controller is parked;
+//   - a controller swap (update) is in flight;
+//   - a heavy operation holds the host-wide gate (a backup of any tier the agent runs, a restore test, an OS step),
+//     or jobBlocker finds one (an agent backup job, a drive or NAS job, an escrow ceremony, a vzdump of the guest);
+//   - the CONTROLLER says it is busy: a backup, a restore, an off-site run or an app update (its `ctl/busy` file,
+//     read over one exact `pct exec … cat` grant; controllerBusy below). Fails closed on any read error but „no file";
+//   - at most ONE reboot per hour per guest (the record below, persisted — it survives an agent restart);
+//   - the operator restart's brake: a reboot counts as a restart, and the brake's refusal refuses a reboot too.
+// The heavy-operation gate is HELD from the checks until the guest is up again, so no backup, restore test or OS
+// step of this agent can start in between. The guest-power watchdog and the controller supervisor leave the guest
+// alone while the reboot runs (rebootInFlight).
+//
+// AFTER: the result says when the guest was up and when the controller answered (both from the press). The record
+// `<guests>/<vmid>/operator-reboot.json` is written BEFORE the reboot, so the controller that starts after it finds
+// it: GET /guest/operator-reboot hands it to the household's dashboard („Felhom support restarted your box at …",
+// one day). Pinned by opreboot_test.go.
+
+const (
+	// OpRebootGuest is the agent's second operator verb (D65 = A).
+	OpRebootGuest = "reboot_guest"
+
+	// opRebootEvery: at most one operator reboot per guest per hour.
+	opRebootEvery = time.Hour
+	// opRebootNoticeFor: how long the household's dashboard shows the line.
+	opRebootNoticeFor = 24 * time.Hour
+	// opRebootTimeout bounds `pct reboot` (it blocks until the guest is back).
+	opRebootTimeout = 5 * time.Minute
+
+	operatorRebootFile = "operator-reboot.json"
+
+	// ControllerBusyMarkerGuestPath is the controller's busy file as the GUEST sees it: the controller data volume
+	// (`felhom-controller-data`, mounted at /opt/docker/felhom-controller in the container) + data/ctl/busy. One exact
+	// sudo vector reads it (configs/felhom-agent.sudoers, FELHOM_CONTROLLERSWAP). It reads without Docker, so a stuck
+	// Docker does not hide it.
+	ControllerBusyMarkerGuestPath = "/var/lib/docker/volumes/felhom-controller-data/_data/data/ctl/busy"
+	// controllerBusyFresh: the controller rewrites the file every 15 s while busy; an older file is a controller that
+	// stopped writing (stuck or killed) — not a busy one.
+	controllerBusyFresh = 90 * time.Second
+)
+
+// operatorRebootRecord is the persisted record of the last operator reboot of a guest.
+type operatorRebootRecord struct {
+	At               time.Time `json:"at"`
+	ActionID         int64     `json:"action_id"`
+	GuestUpAfterS    int       `json:"guest_up_after_s,omitempty"`
+	ControllerAfterS int       `json:"controller_after_s,omitempty"`
+}
+
+func (s *Server) operatorRebootPath(vmid int) string {
+	return filepath.Join(s.guestsStateDir(), strconv.Itoa(vmid), operatorRebootFile)
+}
+
+// lastOperatorReboot reads the record; ok=false when there is none. A corrupt record is an error (the hourly limit
+// must not silently vanish).
+func (s *Server) lastOperatorReboot(vmid int) (operatorRebootRecord, bool, error) {
+	raw, err := os.ReadFile(s.operatorRebootPath(vmid))
+	if errors.Is(err, os.ErrNotExist) {
+		return operatorRebootRecord{}, false, nil
+	}
+	if err != nil {
+		return operatorRebootRecord{}, false, err
+	}
+	var rec operatorRebootRecord
+	if err := json.Unmarshal(raw, &rec); err != nil {
+		return operatorRebootRecord{}, false, fmt.Errorf("corrupt %s: %w", operatorRebootFile, err)
+	}
+	return rec, !rec.At.IsZero(), nil
+}
+
+func (s *Server) saveOperatorReboot(vmid int, rec operatorRebootRecord) error {
+	raw, err := json.Marshal(rec)
+	if err != nil {
+		return err
+	}
+	p := s.operatorRebootPath(vmid)
+	tmp := p + ".tmp"
+	if err := os.WriteFile(tmp, raw, 0o644); err != nil {
+		return err
+	}
+	return os.Rename(tmp, p)
+}
+
+// rebooting reports whether an operator reboot of the guest is in flight (the watchdogs leave it alone).
+func (s *Server) rebooting(vmid int) bool {
+	s.rebootMu.Lock()
+	defer s.rebootMu.Unlock()
+	return s.rebootInFlight[vmid]
+}
+
+func (s *Server) setRebooting(vmid int, on bool) {
+	s.rebootMu.Lock()
+	defer s.rebootMu.Unlock()
+	if s.rebootInFlight == nil {
+		s.rebootInFlight = map[int]bool{}
+	}
+	if on {
+		s.rebootInFlight[vmid] = true
+	} else {
+		delete(s.rebootInFlight, vmid)
+	}
+}
+
+func (s *Server) rebooter() interface {
+	RebootGuest(ctx context.Context, vmid int) error
+} {
+	if s.opRebooter != nil {
+		return s.opRebooter
+	}
+	if s.guestAttach != nil {
+		return s.guestAttach
+	}
+	return nil
+}
+
+// controllerBusy reads the controller's busy file. busy=true with the controller's reason when the file is fresh;
+// a missing file is „not busy" (an idle controller, or one older than the file); any other read failure is an error
+// (the caller refuses — it cannot prove no backup runs).
+func (s *Server) controllerBusy(ctx context.Context, vmid int) (bool, string, error) {
+	out, err := s.guestExec.GuestExec(ctx, vmid, "cat", ControllerBusyMarkerGuestPath)
+	if err != nil {
+		if strings.Contains(strings.ToLower(err.Error()+" "+out), "no such file") {
+			return false, "", nil
+		}
+		return false, "", err
+	}
+	lines := strings.SplitN(strings.TrimSpace(out), "\n", 2)
+	at, perr := time.Parse(time.RFC3339, strings.TrimSpace(lines[0]))
+	if perr != nil {
+		return false, "", fmt.Errorf("the controller's busy file does not start with a time: %q", lines[0])
+	}
+	if s.clock().Sub(at) > controllerBusyFresh {
+		s.logger.Info("operator reboot: the controller's busy file is stale — the controller stopped writing it; not busy",
+			"vmid", vmid, "written", at.UTC().Format(time.RFC3339))
+		return false, "", nil
+	}
+	why := "work in progress"
+	if len(lines) == 2 && strings.TrimSpace(lines[1]) != "" {
+		why = strings.TrimSpace(lines[1])
+	}
+	return true, why, nil
+}
+
+// operatorRebootGuest is the press: every guard, then the reboot, then the wait for the guest and the controller.
+func (s *Server) operatorRebootGuest(ctx context.Context, id int64, arg string) (string, string) {
+	vmid, err := strconv.Atoi(arg)
+	if err != nil || strconv.Itoa(vmid) != arg {
+		return opOutcomeRefused, fmt.Sprintf("refused: %q is not a guest id", arg)
+	}
+	rb := s.rebooter()
+	if s.staleLock == nil || s.guestExec == nil || rb == nil {
+		return opOutcomeRefused, "refused: the guest reboot is not wired on this agent"
+	}
+	if !s.provisionedGuest(vmid) {
+		return opOutcomeRefused, fmt.Sprintf("refused: guest %d is not a guest this agent provisioned", vmid)
+	}
+	if s.rebooting(vmid) {
+		return opOutcomeRefused, fmt.Sprintf("refused: a reboot of guest %d is already running", vmid)
+	}
+	guests, err := s.staleLock.Guests(ctx)
+	if err != nil {
+		return opOutcomeRefused, "refused: the guest list cannot be read — ownership unproven, nothing touched"
+	}
+	status := ""
+	for _, g := range guests {
+		if g.VMID == vmid {
+			status = g.Status
+		}
+	}
+	if status != "running" {
+		return opOutcomeRefused, fmt.Sprintf("refused: guest %d is not running (%s) — the guest-power watchdog owns it", vmid, orDash(status))
+	}
+	if s.controllerParked(vmid) {
+		return opOutcomeRefused, fmt.Sprintf("refused: guest %d's controller is parked (remove the controller-parked marker first)", vmid)
+	}
+	// A controller swap (update) is refused by jobBlocker below, with the agent's other jobs.
+	if lock, _, err := s.staleLock.Lock(ctx, vmid); err != nil {
+		return opOutcomeRefused, "refused: the guest lock cannot be read — nothing touched"
+	} else if lock != "" {
+		return opOutcomeRefused, fmt.Sprintf("refused: guest %d is locked (%s) — another operation owns it", vmid, lock)
+	}
+
+	// At most one per hour.
+	now := s.clock()
+	last, had, err := s.lastOperatorReboot(vmid)
+	if err != nil {
+		return opOutcomeRefused, "refused: the last reboot's record cannot be read — " + err.Error()
+	}
+	if had && now.Sub(last.At) < opRebootEvery {
+		return opOutcomeRefused, fmt.Sprintf("refused: guest %d was rebooted from the hub at %s UTC — at most one reboot per hour (next from %s UTC)",
+			vmid, last.At.UTC().Format("15:04"), last.At.Add(opRebootEvery).UTC().Format("15:04"))
+	}
+
+	// The brake: a refusal in force refuses a reboot too, and 3 restarts in 15 minutes refuse it.
+	s.ctrlSup.mu.Lock()
+	st := s.supState(vmid)
+	if now.Before(st.opBrakeUntil) {
+		until := st.opBrakeUntil
+		s.ctrlSup.mu.Unlock()
+		return opOutcomeRefused, fmt.Sprintf("refused: 3 restarts in 15 minutes — presses are refused until %s UTC", until.UTC().Format("15:04"))
+	}
+	st.restarts = pruneBefore(st.restarts, now.Add(-controllerCrashloopWindow))
+	if len(st.restarts) >= controllerCrashloopMax {
+		st.opBrakeUntil = now.Add(opBrakeRefusal)
+		until := st.opBrakeUntil
+		s.ctrlSup.mu.Unlock()
+		return opOutcomeRefused, fmt.Sprintf("refused: 3 restarts in 15 minutes — presses are refused until %s UTC", until.UTC().Format("15:04"))
+	}
+	s.ctrlSup.mu.Unlock()
+
+	// The heavy-operation gate, held until the guest is up again.
+	release, busy, ok := s.inFlight.TryAcquire("guest-reboot")
+	if !ok {
+		return opOutcomeRefused, "refused: a backup or another heavy operation runs on the host (" + busy + ")"
+	}
+	defer release()
+	if code, detail := s.jobBlocker(ctx, vmid); code != "" {
+		return opOutcomeRefused, "refused: " + rebootBlockerSentence(code) + " (" + detail + ")"
+	}
+	if cbusy, why, err := s.controllerBusy(ctx, vmid); err != nil {
+		return opOutcomeRefused, "refused: the controller's busy file cannot be read, so a running backup cannot be ruled out — " + err.Error()
+	} else if cbusy {
+		return opOutcomeRefused, "refused: the controller is busy — " + why
+	}
+
+	// The record FIRST: the hourly limit and the household's line both read it.
+	rec := operatorRebootRecord{At: now, ActionID: id}
+	if err := s.saveOperatorReboot(vmid, rec); err != nil {
+		return opOutcomeRefused, "refused: the reboot cannot be recorded — " + err.Error()
+	}
+	s.ctrlSup.mu.Lock()
+	st = s.supState(vmid)
+	st.restarts = append(st.restarts, now)
+	st.restartsTotal++
+	st.lastRestartAt = now
+	st.lastReason = fmt.Sprintf("guest reboot by the operator via the hub (action #%d)", id)
+	st.notRunningSeen = 0
+	s.ctrlSup.mu.Unlock()
+	s.setRebooting(vmid, true)
+	defer s.setRebooting(vmid, false)
+
+	s.logger.Warn("operator reboot: REBOOTING the guest on the operator's press", "vmid", vmid, "action_id", id)
+	began := time.Now()
+	rctx, cancel := context.WithTimeout(ctx, opRebootTimeout)
+	err = rb.RebootGuest(rctx, vmid)
+	cancel()
+	if err != nil {
+		return opOutcomeFailed, fmt.Sprintf("the reboot of guest %d failed: %v — look at the box (the guest-power watchdog starts a stopped guest)", vmid, err)
+	}
+	upS := int(time.Since(began).Round(time.Second) / time.Second)
+	rec.GuestUpAfterS = upS
+	// The controller's own HEALTHCHECK is the answer, as for a restart; the wait starts when the guest is up.
+	for deadline := time.Now().Add(s.opWait()); time.Now().Before(deadline); {
+		out, err := s.guestExec.GuestExec(ctx, vmid, "docker", "inspect", "-f", opHealthTemplate, controllerContainer)
+		if err == nil {
+			f := strings.SplitN(strings.TrimSpace(out), "|", 2)
+			if len(f) == 2 && f[0] == "true" && (f[1] == "healthy" || f[1] == "none") {
+				rec.ControllerAfterS = int(time.Since(began).Round(time.Second) / time.Second)
+				if serr := s.saveOperatorReboot(vmid, rec); serr != nil {
+					s.logger.Warn("operator reboot: the times could not be added to the record", "vmid", vmid, "err", serr)
+				}
+				return opOutcomeDone, fmt.Sprintf("rebooted; the guest was up after %d s, the controller answered after %d s", upS, rec.ControllerAfterS)
+			}
+		}
+		select {
+		case <-ctx.Done():
+			return opOutcomeFailed, fmt.Sprintf("rebooted; the guest was up after %d s, but the wait for the controller was cut", upS)
+		case <-time.After(s.opPoll()):
+		}
+	}
+	_ = s.saveOperatorReboot(vmid, rec)
+	return opOutcomeFailed, fmt.Sprintf("rebooted; the guest was up after %d s, but the controller gave no healthy answer within %s — look at the box", upS, s.opWait().Round(time.Second))
+}
+
+// rebootBlockerSentence names jobBlocker's code in the result's words.
+func rebootBlockerSentence(code string) string {
+	switch code {
+	case PowerOffBackup:
+		return "a backup is running"
+	case PowerOffCtrlUpdate:
+		return "a controller update is running"
+	case PowerOffDrive:
+		return "a drive or network-storage job is running"
+	case PowerOffEscrow:
+		return "an escrow ceremony is running"
+	case PowerOffUnknown:
+		return "the running jobs cannot be read"
+	default:
+		return "the host is busy"
+	}
+}
+
+// handleOperatorRebootNotice — GET /guest/operator-reboot (self-scoped): the last operator reboot of THIS guest, when it
+// is less than a day old, for the household's dashboard line. {"at": ""} when there is none.
+func (s *Server) handleOperatorRebootNotice(w http.ResponseWriter, _ *http.Request, vmid int) {
+	rec, ok, err := s.lastOperatorReboot(vmid)
+	if err != nil {
+		writeErr(w, http.StatusInternalServerError, "the reboot record cannot be read")
+		return
+	}
+	if !ok || s.clock().Sub(rec.At) >= opRebootNoticeFor {
+		writeOK(w, map[string]any{"vmid": vmid, "at": ""})
+		return
+	}
+	writeOK(w, map[string]any{"vmid": vmid, "at": rec.At.UTC().Format(time.RFC3339), "by": "operator"})
+}
diff --git a/internal/localapi/opreboot_test.go b/internal/localapi/opreboot_test.go
new file mode 100644
index 0000000..6f801bd
--- /dev/null
+++ b/internal/localapi/opreboot_test.go
@@ -0,0 +1,306 @@
+package localapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"gitea.dooplex.hu/admin/felhom-agent/internal/backup"
+	"gitea.dooplex.hu/admin/felhom-agent/internal/hub"
+)
+
+// D65 = A (operator 2026-10-29 15:50): „Reboot guest" from the hub. The agent's reboot_guest — the existing
+// `pct reboot` of THAT guest — with its guards, the hourly limit, the brake, and the record the household's line reads.
+
+// rbExec adds the controller's busy file to the operator-restart fake.
+type rbExec struct {
+	*opExec
+	busy    string // the file's content; "" = no file
+	busyErr error  // pct exec itself failed
+}
+
+func (f *rbExec) GuestExec(ctx context.Context, vmid int, args ...string) (string, error) {
+	if len(args) == 2 && args[0] == "cat" && args[1] == ControllerBusyMarkerGuestPath {
+		if f.busyErr != nil {
+			return "", f.busyErr
+		}
+		if f.busy == "" {
+			return "", errors.New("pct exec 9201 [cat ...]: exit status 1: cat: " + ControllerBusyMarkerGuestPath + ": No such file or directory")
+		}
+		return f.busy, nil
+	}
+	return f.opExec.GuestExec(ctx, vmid, args...)
+}
+
+type fakeRebooter struct {
+	mu    sync.Mutex
+	n     int
+	err   error
+	after func()
+}
+
+func (r *fakeRebooter) RebootGuest(context.Context, int) error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.n++
+	if r.after != nil {
+		r.after()
+	}
+	return r.err
+}
+
+func (r *fakeRebooter) count() int {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	return r.n
+}
+
+func rbServer(t *testing.T) (*Server, *rbExec, *fakeRebooter, *fakeGuestPowerCtl, *supClock, string) {
+	t.Helper()
+	s, ox, ctl, clk, dir, _ := opServer(t, "running")
+	ex := &rbExec{opExec: ox}
+	s.guestExec = ex
+	rb := &fakeRebooter{}
+	s.opRebooter = rb
+	s.inFlight = &backup.InFlight{}
+	return s, ex, rb, ctl, clk, dir
+}
+
+func pressReboot(t *testing.T, s *Server, id int64) hub.OperatorActionResult {
+	t.Helper()
+	s.OnEnvelope(context.Background(), env(hub.OperatorAction{ID: id, Action: "reboot_guest", Arg: "9201"}))
+	return waitResult(t, s, id)
+}
+
+// The press reboots ONCE and says when the guest was up and when the controller answered; the record is written for
+// the household's line. RED-PROOF: drop the RebootGuest call → reboots 0 → FAILS.
+func TestOpReboot_RebootsAndReportsTheTimes(t *testing.T) {
+	s, _, rb, _, clk, _ := rbServer(t)
+	r := pressReboot(t, s, 1)
+	if r.Outcome != "done" || !strings.Contains(r.Message, "the guest was up after") || !strings.Contains(r.Message, "the controller answered after") {
+		t.Fatalf("result %+v", r)
+	}
+	if rb.count() != 1 {
+		t.Fatalf("reboots = %d, want 1", rb.count())
+	}
+	rec, ok, err := s.lastOperatorReboot(9201)
+	if err != nil || !ok || !rec.At.Equal(clk.t) || rec.ActionID != 1 {
+		t.Fatalf("record %+v ok=%v err=%v", rec, ok, err)
+	}
+	if s.inFlight.Busy() != "" {
+		t.Fatalf("the heavy-operation gate is still held after the reboot: %q", s.inFlight.Busy())
+	}
+	if s.rebooting(9201) {
+		t.Fatal("the reboot-in-flight flag outlived the reboot")
+	}
+}
+
+// Each guard refuses with its reason and NOTHING is rebooted. RED-PROOF: each guard seen failing by deleting it.
+func TestOpReboot_GuardsRefuse(t *testing.T) {
+	fresh := func(clk *supClock) string {
+		return clk.t.Add(-20*time.Second).Format(time.RFC3339) + "\nan off-site backup is running\n"
+	}
+	cases := []struct {
+		name, want string
+		setup      func(s *Server, ex *rbExec, ctl *fakeGuestPowerCtl, clk *supClock, dir string)
+	}{
+		{"parked", "parked", func(_ *Server, _ *rbExec, _ *fakeGuestPowerCtl, _ *supClock, dir string) {
+			if err := os.WriteFile(filepath.Join(dir, "9201", ControllerParkedMarker), nil, 0o600); err != nil {
+				panic(err)
+			}
+		}},
+		{"swap", "swap", func(s *Server, _ *rbExec, _ *fakeGuestPowerCtl, _ *supClock, _ string) { s.swapInFlight[9201] = true }},
+		{"locked", "locked", func(_ *Server, _ *rbExec, ctl *fakeGuestPowerCtl, _ *supClock, _ string) { ctl.locks[9201] = "backup" }},
+		{"stopped", "not running", func(_ *Server, _ *rbExec, ctl *fakeGuestPowerCtl, _ *supClock, _ string) {
+			ctl.guests[0].Status = "stopped"
+		}},
+		{"vzdump", "backup", func(_ *Server, _ *rbExec, ctl *fakeGuestPowerCtl, _ *supClock, _ string) {
+			ctl.backupRun = map[int]bool{9201: true}
+		}},
+		{"vzdump unknown", "cannot be read", func(_ *Server, _ *rbExec, ctl *fakeGuestPowerCtl, _ *supClock, _ string) {
+			ctl.backupErr = errors.New("tasks unreadable")
+		}},
+		{"heavy gate", "backup:felhom-pbs", func(s *Server, _ *rbExec, _ *fakeGuestPowerCtl, _ *supClock, _ string) {
+			s.inFlight.TryAcquire("backup:felhom-pbs")
+		}},
+		{"agent backup job", "a backup is running", func(s *Server, _ *rbExec, _ *fakeGuestPowerCtl, _ *supClock, _ string) {
+			s.jobs = map[backupJobKey]*backupJob{{vmid: 9201, target: "local"}: {JobID: "j1", Phase: PhaseRunning}}
+		}},
+		{"controller busy", "off-site backup", func(_ *Server, ex *rbExec, _ *fakeGuestPowerCtl, clk *supClock, _ string) {
+			ex.busy = fresh(clk)
+		}},
+		{"busy file unreadable", "cannot be ruled out", func(_ *Server, ex *rbExec, _ *fakeGuestPowerCtl, _ *supClock, _ string) {
+			ex.busyErr = errors.New("pct exec 9201: exit status 255: lxc-attach failed")
+		}},
+		{"brake in force", "3 restarts in 15 minutes", func(s *Server, _ *rbExec, _ *fakeGuestPowerCtl, clk *supClock, _ string) {
+			s.ctrlSup.mu.Lock()
+			s.supState(9201).opBrakeUntil = clk.t.Add(10 * time.Minute)
+			s.ctrlSup.mu.Unlock()
+		}},
+		{"not provisioned", "not a guest this agent provisioned", func(_ *Server, _ *rbExec, _ *fakeGuestPowerCtl, _ *supClock, dir string) {
+			if err := os.RemoveAll(filepath.Join(dir, "9201", "bootstrap")); err != nil {
+				panic(err)
+			}
+		}},
+	}
+	for i, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			s, ex, rb, ctl, clk, dir := rbServer(t)
+			tc.setup(s, ex, ctl, clk, dir)
+			r := pressReboot(t, s, int64(100+i))
+			if r.Outcome != "refused" || !strings.Contains(r.Message, tc.want) {
+				t.Fatalf("result %+v, want refused naming %q", r, tc.want)
+			}
+			if rb.count() != 0 {
+				t.Fatalf("guard %q did not hold: rebooted", tc.name)
+			}
+			if _, ok, _ := s.lastOperatorReboot(9201); ok {
+				t.Fatal("a refused press wrote the reboot record (the household would read a reboot that never happened)")
+			}
+		})
+	}
+}
+
+// A busy file the controller stopped writing (stuck, killed) is not a busy controller — the reboot exists for exactly
+// that box. RED-PROOF: drop the freshness check → refused → FAILS.
+func TestOpReboot_StaleBusyFileDoesNotBlock(t *testing.T) {
+	s, ex, rb, _, clk, _ := rbServer(t)
+	ex.busy = clk.t.Add(-10*time.Minute).Format(time.RFC3339) + "\na backup is running\n"
+	if r := pressReboot(t, s, 1); r.Outcome != "done" || rb.count() != 1 {
+		t.Fatalf("result %+v, reboots %d", r, rb.count())
+	}
+}
+
+// At most one reboot per hour per guest, and the limit survives an agent restart (the record is on disk).
+// RED-PROOF: drop the hourly check → the second press reboots → FAILS.
+func TestOpReboot_AtMostOncePerHour(t *testing.T) {
+	s, _, rb, ctl, clk, dir := rbServer(t)
+	if r := pressReboot(t, s, 1); r.Outcome != "done" {
+		t.Fatalf("first press: %+v", r)
+	}
+	clk.t = clk.t.Add(59 * time.Minute)
+	if r := pressReboot(t, s, 2); r.Outcome != "refused" || !strings.Contains(r.Message, "at most one reboot per hour") {
+		t.Fatalf("second press inside the hour: %+v", r)
+	}
+	// a restarted agent (a fresh in-memory state over the same guests dir) still refuses
+	s2, ox2, _, _, _, _ := opServer(t, "running")
+	s2.guestsDir, s2.staleLock, s2.now = dir, ctl, clk.now
+	s2.guestExec = &rbExec{opExec: ox2}
+	rb2 := &fakeRebooter{}
+	s2.opRebooter, s2.inFlight = rb2, &backup.InFlight{}
+	if r := pressReboot(t, s2, 3); r.Outcome != "refused" || rb2.count() != 0 {
+		t.Fatalf("after an agent restart, inside the hour: %+v", r)
+	}
+	clk.t = clk.t.Add(2 * time.Minute)
+	if r := pressReboot(t, s, 4); r.Outcome != "done" || rb.count() != 2 {
+		t.Fatalf("after the hour: %+v (reboots %d)", r, rb.count())
+	}
+}
+
+// The brake counts a reboot as a restart: two operator restarts and one reboot inside 15 minutes refuse the next
+// restart press. RED-PROOF: drop the restarts append in operatorRebootGuest → the 4th press restarts → FAILS.
+func TestOpReboot_TheBrakeCountsAReboot(t *testing.T) {
+	s, ex, _, _, clk, _ := rbServer(t)
+	for id := int64(1); id <= 2; id++ {
+		s.OnEnvelope(context.Background(), env(hub.OperatorAction{ID: id, Action: "restart_controller", Arg: "9201"}))
+		if r := waitResult(t, s, id); r.Outcome != "done" {
+			t.Fatalf("restart %d: %+v", id, r)
+		}
+		clk.t = clk.t.Add(time.Minute)
+	}
+	if r := pressReboot(t, s, 3); r.Outcome != "done" {
+		t.Fatalf("reboot: %+v", r)
+	}
+	clk.t = clk.t.Add(time.Minute)
+	s.OnEnvelope(context.Background(), env(hub.OperatorAction{ID: 4, Action: "restart_controller", Arg: "9201"}))
+	if r := waitResult(t, s, 4); r.Outcome != "refused" || !strings.Contains(r.Message, "3 restarts in 15 minutes") {
+		t.Fatalf("the 4th restart (2 restarts + 1 reboot) in 15 minutes: %+v", r)
+	}
+	if n := ex.count(9201); n != 2 {
+		t.Fatalf("restarts = %d, want 2", n)
+	}
+}
+
+// A failed `pct reboot` is a FAILED press, said plainly; the gate and the flag are given back.
+func TestOpReboot_FailedRebootIsFailed(t *testing.T) {
+	s, _, rb, _, _, _ := rbServer(t)
+	rb.err = errors.New("pct reboot 9201: exit status 255")
+	if r := pressReboot(t, s, 1); r.Outcome != "failed" || !strings.Contains(r.Message, "failed") {
+		t.Fatalf("result %+v", r)
+	}
+	if s.inFlight.Busy() != "" || s.rebooting(9201) {
+		t.Fatal("the gate or the flag outlived a failed reboot")
+	}
+}
+
+// While the reboot runs, the guest-power watchdog does not start the (momentarily stopped) guest and the supervisor
+// does not restart its controller. RED-PROOF: drop either rebooting() check → a start or a restart → FAILS.
+func TestOpReboot_TheWatchdogsLeaveARebootingGuestAlone(t *testing.T) {
+	s, ex, rb, ctl, _, _ := rbServer(t)
+	var started, restarted int
+	rb.after = func() {
+		ctl.guests[0].Status = "stopped"
+		s.GuestPowerTick(context.Background())
+		ctl.guests[0].Status = "running"
+		ex.mu.Lock()
+		ex.status[9201] = "exited"
+		ex.mu.Unlock()
+		s.ControllerSupervisorTick(context.Background())
+		s.ControllerSupervisorTick(context.Background())
+		started, restarted = len(ctl.started), ex.count(9201)
+		ex.mu.Lock()
+		ex.status[9201] = "running"
+		ex.mu.Unlock()
+	}
+	if r := pressReboot(t, s, 1); r.Outcome != "done" {
+		t.Fatalf("result %+v", r)
+	}
+	if started != 0 || restarted != 0 {
+		t.Fatalf("during the reboot: guest-power started %d, the supervisor restarted %d — both must leave it to pct reboot", started, restarted)
+	}
+}
+
+// The household's line: GET /guest/operator-reboot returns the time for a day, then nothing.
+// RED-PROOF: drop the 24-hour check → the 25-hour read still returns the time → FAILS.
+func TestOpReboot_TheNoticeExpiresAfterADay(t *testing.T) {
+	s, _, _, _, clk, _ := rbServer(t)
+	read := func() string {
+		w := httptest.NewRecorder()
+		s.handleOperatorRebootNotice(w, httptest.NewRequest("GET", "/guest/operator-reboot", nil), 9201)
+		var body struct {
+			Data struct {
+				At string `json:"at"`
+			} `json:"data"`
+			At string `json:"at"`
+		}
+		if err := json.Unmarshal(w.Body.Bytes(), &body); err != nil {
+			t.Fatalf("body %q: %v", w.Body.String(), err)
+		}
+		if body.Data.At != "" {
+			return body.Data.At
+		}
+		return body.At
+	}
+	if got := read(); got != "" {
+		t.Fatalf("no reboot yet, got %q", got)
+	}
+	at := clk.t
+	if r := pressReboot(t, s, 1); r.Outcome != "done" {
+		t.Fatalf("result %+v", r)
+	}
+	clk.t = at.Add(23 * time.Hour)
+	if got := read(); got != at.UTC().Format(time.RFC3339) {
+		t.Fatalf("after 23 h: %q, want %s", got, at.UTC().Format(time.RFC3339))
+	}
+	clk.t = at.Add(25 * time.Hour)
+	if got := read(); got != "" {
+		t.Fatalf("after 25 h the line must be gone, got %q", got)
+	}
+}
diff --git a/internal/localapi/server.go b/internal/localapi/server.go
index bf3fcb3..05c09ce 100644
--- a/internal/localapi/server.go
+++ b/internal/localapi/server.go
@@ -417,6 +417,13 @@ type Server struct {
 	opTrigger    func()
 	opHealthPoll time.Duration
 	opHealthWait time.Duration
+	// D65 = A (2026-10-29): the operator's guest reboot (opreboot.go). opRebooter is a test seam (nil → guestAttach);
+	// rebootInFlight keeps the guest-power watchdog and the controller supervisor off a guest being rebooted.
+	opRebooter interface {
+		RebootGuest(ctx context.Context, vmid int) error
+	}
+	rebootMu       sync.Mutex
+	rebootInFlight map[int]bool
 
 	// Network-storage verify job (SPIKE-nas-verify): the IN-MEMORY single slot + the seams the
 	// detached pipeline runs through (tests inject; production defaults set in NewServer).
@@ -603,6 +610,8 @@ func (s *Server) Handler() http.Handler {
 	mux.HandleFunc("POST /disks/guest-attach", s.withGuest(s.handleDiskGuestAttach))
 	// Guest reboot (slice 10 P2 activation): user-triggered restart to activate pending drive binds.
 	mux.HandleFunc("POST /guest/reboot", s.withGuest(s.handleGuestReboot))
+	// D65 = A: the last operator reboot of THIS guest (< 1 day), for the household's dashboard line (opreboot.go).
+	mux.HandleFunc("GET /guest/operator-reboot", s.withGuest(s.handleOperatorRebootNotice))
 	// Host power-off (R-998, doc 14): the household's „A gép kikapcsolása". Guarded in hostpoweroff.go.
 	mux.HandleFunc("POST /host/poweroff", s.withGuest(s.handleHostPowerOff))
 	// Guest RAM resize (v0.90.0, R-24): read current allocation + bounds, and apply a bounded resize