diff --git a/README.md b/README.md
index f15dff5..765e55c 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,8 @@ Behaviour shared across roles lives in a function class, exactly once, and a rol
 is a thin bundle over them — `PackageManagementMixin`, `HealthMetricsMixin`,
 `ServiceControlMixin`, `UpdateMixin`, `NatVpnMixin`, `MacAclMixin`, `FirewallRuleMixin`,
 `DhcpServerMixin`, `PingSweepMixin`, `ConfigLifecycleMixin`, `InterfaceFilterMixin`.
+`HostRebootMixin` (`reboot_host`) is mixed into `DeviceTypeDriver` itself, since any
+device may be restartable; like the others it only declares.
 
 A function class may use the **template form** — public method concrete, the
 device-specific part a `_hook` declared under `if TYPE_CHECKING` — *when the base
diff --git a/napalm_device_types/__init__.py b/napalm_device_types/__init__.py
index 37d2060..436e2d7 100644
--- a/napalm_device_types/__init__.py
+++ b/napalm_device_types/__init__.py
@@ -38,6 +38,7 @@ instead of being restated on every role that happens to need it:
 * :class:`~napalm_device_types.dhcp.DhcpServerMixin`
 * :class:`~napalm_device_types.firewall_rules.FirewallRuleMixin`
 * :class:`~napalm_device_types.health_metrics.HealthMetricsMixin`
+* :class:`~napalm_device_types.host_reboot.HostRebootMixin`
 * :class:`~napalm_device_types.interface_filter.InterfaceFilterMixin`
 * :class:`~napalm_device_types.mac_acl.MacAclMixin`
 * :class:`~napalm_device_types.nat_vpn.NatVpnMixin`
@@ -60,6 +61,7 @@ from napalm_device_types.hypervisor import HypervisorDriver
 from napalm_device_types.os import OSDriver
 from napalm_device_types.firewall_rules import FirewallRuleMixin
 from napalm_device_types.health_metrics import HealthMetricsMixin
+from napalm_device_types.host_reboot import HostRebootMixin
 from napalm_device_types.interface_filter import InterfaceFilterMixin
 from napalm_device_types.mac_acl import MacAclMixin
 from napalm_device_types.media import MediaDriver
@@ -83,6 +85,7 @@ __all__ = [
     "FirewallDriver",
     "FirewallRuleMixin",
     "HealthMetricsMixin",
+    "HostRebootMixin",
     "HypervisorDriver",
     "InterfaceFilterMixin",
     "MacAclMixin",
diff --git a/napalm_device_types/base.py b/napalm_device_types/base.py
index 5f2d52d..110cefe 100644
--- a/napalm_device_types/base.py
+++ b/napalm_device_types/base.py
@@ -12,6 +12,7 @@ from typing import NamedTuple
 
 from napalm.base import NetworkDriver
 
+from napalm_device_types.host_reboot import HostRebootMixin
 from napalm_device_types.ping_sweep import PingSweepMixin
 
 
@@ -47,7 +48,7 @@ class PortSpec(NamedTuple):
     mandatory: bool = False
 
 
-class DeviceTypeDriver(PingSweepMixin, NetworkDriver):
+class DeviceTypeDriver(PingSweepMixin, HostRebootMixin, NetworkDriver):
     """Common base for all netOrk device-type drivers.
 
     Sits between napalm.base.NetworkDriver and the type-specific abstract
diff --git a/napalm_device_types/host_reboot.py b/napalm_device_types/host_reboot.py
new file mode 100644
index 0000000..2a21c1f
--- /dev/null
+++ b/napalm_device_types/host_reboot.py
@@ -0,0 +1,30 @@
+"""Restarting the device itself.
+
+Declared under ``if TYPE_CHECKING``: a contract, not a placeholder. Only a
+driver that can actually restart its device defines ``reboot_host``, so
+``hasattr(driver, "reboot_host")`` tells a caller whether to offer it.
+"""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+
+class HostRebootMixin:
+    if TYPE_CHECKING:
+
+        def reboot_host(self) -> None:
+            """
+            Restarts the device this driver is connected to.
+
+            Returns once the device has accepted the request; the session is
+            usually gone right after. Waiting for the device to come back is
+            the caller's business (see ``REBOOT_SETTLE_SECONDS``).
+
+            A driver that manages other machines restarts its *own* host, never
+            one of them: a hypervisor restarts the hypervisor, not a VM.
+
+            :raises RuntimeError: If the device refuses, e.g. an ESXi host that
+                is not in maintenance mode while VMs are running.
+            """
+            ...
diff --git a/napalm_device_types/hypervisor.py b/napalm_device_types/hypervisor.py
index 268e8df..9e01036 100644
--- a/napalm_device_types/hypervisor.py
+++ b/napalm_device_types/hypervisor.py
@@ -43,6 +43,11 @@ class HypervisorDriver(PackageManagementMixin, HealthMetricsMixin, DeviceTypeDri
     ROLE: str = "hypervisor"
     TYPE_LABEL: str = "Hypervisor"
 
+    #: What cloud-init installs and starts on a VM provisioned through this
+    #: driver, so the hypervisor can read the guest's IP address back.
+    GUEST_AGENT_PACKAGES: tuple[str, ...] = ("qemu-guest-agent",)
+    GUEST_AGENT_RUNCMD: tuple[str, ...] = ("systemctl enable --now qemu-guest-agent",)
+
 
 
     # ------------------------------------------------------------------
diff --git a/napalm_device_types/models.py b/napalm_device_types/models.py
index 5319808..3f9d67b 100644
--- a/napalm_device_types/models.py
+++ b/napalm_device_types/models.py
@@ -889,8 +889,8 @@ class NetworkTargetDict(TypedDict):
       is surfaced via ``fixed_vlan_tag`` instead, for display purposes.
     """
 
-    name: str  # Bridge or vnet name, usable directly as NICConfigDict.bridge
-    kind: str  # "bridge" or "vnet"
+    name: str  # Bridge, vnet or port group name, usable directly as NICConfigDict.bridge
+    kind: str  # "bridge", "vnet" or "portgroup" (VMware: VLAN fixed like a vnet's)
     vlan_aware: bool  # True if a NICConfigDict.vlan_tag may be set on top of this target
     fixed_vlan_tag: NotRequired[int | None]  # vnet only: the VLAN ID already baked into it
 
diff --git a/tests/test_host_reboot.py b/tests/test_host_reboot.py
new file mode 100644
index 0000000..ec12da3
--- /dev/null
+++ b/tests/test_host_reboot.py
@@ -0,0 +1,29 @@
+"""reboot_host: the contract for restarting the device itself.
+
+netOrk used to restart a host by sending ``/sbin/reboot`` through a driver's
+private ``_send_command``. A driver that talks to an API instead has no such
+method, and the caller swallowed the resulting AttributeError, so the reboot
+"succeeded" without happening. A declared contract lets netOrk ask first.
+"""
+
+from __future__ import annotations
+
+import inspect
+
+from napalm_device_types import DeviceTypeDriver, HostRebootMixin
+
+
+def test_every_device_type_driver_carries_the_declaration():
+    assert issubclass(DeviceTypeDriver, HostRebootMixin)
+
+
+def test_declared_not_implemented():
+    """hasattr is netOrk's capability probe; only a driver that implements it
+    may answer True."""
+    assert not hasattr(DeviceTypeDriver, "reboot_host")
+
+
+def test_declaration_documents_the_contract():
+    source = inspect.getsource(HostRebootMixin)
+    assert "def reboot_host(self) -> None" in source
+    assert "RuntimeError" in source
diff --git a/tests/test_vm_identifiers.py b/tests/test_vm_identifiers.py
index d38f6e2..ec64e39 100644
--- a/tests/test_vm_identifiers.py
+++ b/tests/test_vm_identifiers.py
@@ -51,3 +51,20 @@ class TestVMConfigCarriesWhatAHardwareViewShows:
         from napalm_device_types.models import VMPassthroughDict
 
         assert get_type_hints(VMPassthroughDict) == {"slot": str, "kind": str, "config": str}
+
+
+class TestGuestAgentDeclaration:
+    """netOrk's cloud-init installed qemu-guest-agent on every new VM. A VMware
+    guest reports its IP through open-vm-tools instead; the hypervisor says
+    which, and netOrk stops hard-coding one of them."""
+
+    def test_default_is_qemu_guest_agent(self):
+        from napalm_device_types import HypervisorDriver
+
+        assert HypervisorDriver.GUEST_AGENT_PACKAGES == ("qemu-guest-agent",)
+        assert HypervisorDriver.GUEST_AGENT_RUNCMD == ("systemctl enable --now qemu-guest-agent",)
+
+    def test_attributes_are_not_methods(self):
+        from napalm_device_types import HypervisorDriver
+
+        assert not callable(vars(HypervisorDriver)["GUEST_AGENT_PACKAGES"])