diff --git a/app/AGENTS.md b/app/AGENTS.md
index 6021c85..a30c3f4 100644
--- a/app/AGENTS.md
+++ b/app/AGENTS.md
@@ -41,7 +41,7 @@ app/
 │   ├── radio_lifecycle.py       # Post-connect setup and reconnect/setup helpers
 │   ├── radio_commands.py        # Radio config/private-key command workflows
 │   ├── radio_stats.py           # In-memory local radio stats sampling and noise-floor history
-│   └── radio_runtime.py         # Router/dependency seam over the global RadioManager
+│   └── radio_runtime.py         # Explicit router/dependency seam over the live radio manager + runtime state
 ├── radio.py             # RadioManager transport/session state + lock management
 ├── radio_sync.py        # Polling, sync, periodic advertisement loop
 ├── decoder.py           # Packet parsing/decryption
@@ -95,7 +95,7 @@ app/
 
 - `RadioManager.start_connection_monitor()` checks health every 5s.
 - `RadioManager.post_connect_setup()` delegates to `services/radio_lifecycle.py`.
-- Routers, startup/lifespan code, fanout helpers, and `radio_sync.py` should reach radio state through `services/radio_runtime.py`, not by importing `app.radio.radio_manager` directly.
+- Routers, startup/lifespan code, fanout helpers, and `radio_sync.py` should reach radio state through `services/radio_runtime.py`, not by importing `app.radio.radio_manager` directly. `RadioManager` owns transport/session operations; mutable runtime metadata and caches now live in its composed runtime-state object.
 - Shared reconnect/setup helpers in `services/radio_lifecycle.py` are used by startup, the monitor, and manual reconnect/reboot flows before broadcasting healthy state.
 - Setup still includes handler registration, key export, time sync, contact/channel sync, and advertisement tasks. The message-poll task always starts: by default it runs as a low-frequency hourly audit, and `MESHCORE_ENABLE_MESSAGE_POLL_FALLBACK=true` switches it to aggressive 10-second polling. That audit checks both missed-radio-message drift and channel-slot cache drift; cache mismatches are logged, toasted, and the send-slot cache is reset.
 - Post-connect setup is timeout-bounded. If initial radio offload/setup hangs too long, the backend logs the failure and broadcasts an `error` toast telling the operator to reboot the radio and restart the server.
diff --git a/app/radio.py b/app/radio.py
index a9b19e2..3903375 100644
--- a/app/radio.py
+++ b/app/radio.py
@@ -3,7 +3,6 @@ import glob
 import logging
 import platform
 import re
-from collections import OrderedDict
 from contextlib import asynccontextmanager, nullcontext
 from pathlib import Path
 
@@ -12,22 +11,23 @@ from serial.serialutil import SerialException
 
 from app.config import settings
 from app.keystore import clear_keys
+from app.radio_runtime_state import (
+    RadioDisconnectedError,
+    RadioOperationBusyError,
+    RadioOperationError,
+    RadioRuntimeState,
+)
 
 logger = logging.getLogger(__name__)
 MAX_FRONTEND_RECONNECT_ERROR_BROADCASTS = 3
 _SERIAL_PORT_ERROR_RE = re.compile(r"could not open port (?P<port>.+?):")
-
-
-class RadioOperationError(RuntimeError):
-    """Base class for shared radio operation lock errors."""
-
-
-class RadioOperationBusyError(RadioOperationError):
-    """Raised when a non-blocking radio operation cannot acquire the lock."""
-
-
-class RadioDisconnectedError(RadioOperationError):
-    """Raised when the radio disconnects between pre-check and lock acquisition."""
+__all__ = [
+    "RadioDisconnectedError",
+    "RadioManager",
+    "RadioOperationBusyError",
+    "RadioOperationError",
+    "radio_manager",
+]
 
 
 def detect_serial_devices() -> list[str]:
@@ -154,29 +154,189 @@ async def find_radio_port(baudrate: int) -> str | None:
 class RadioManager:
     """Manages the MeshCore radio connection."""
 
-    def __init__(self):
+    def __init__(self, runtime_state: RadioRuntimeState | None = None):
         self._meshcore: MeshCore | None = None
-        self._connection_info: str | None = None
-        self._connection_desired: bool = True
-        self._reconnect_task: asyncio.Task | None = None
-        self._last_connected: bool = False
-        self._reconnect_lock: asyncio.Lock | None = None
-        self._operation_lock: asyncio.Lock | None = None
-        self._setup_lock: asyncio.Lock | None = None
-        self._setup_in_progress: bool = False
-        self._setup_complete: bool = False
-        self._frontend_reconnect_error_broadcasts: int = 0
-        self.device_info_loaded: bool = False
-        self.max_contacts: int | None = None
-        self.device_model: str | None = None
-        self.firmware_build: str | None = None
-        self.firmware_version: str | None = None
-        self.max_channels: int = 40
-        self.path_hash_mode: int = 0
-        self.path_hash_mode_supported: bool = False
-        self._channel_slot_by_key: OrderedDict[str, int] = OrderedDict()
-        self._channel_key_by_slot: dict[int, str] = {}
-        self._pending_message_channel_key_by_slot: dict[int, str] = {}
+        self._state = runtime_state or RadioRuntimeState()
+
+    @property
+    def state(self) -> RadioRuntimeState:
+        return self._state
+
+    @property
+    def _connection_info(self) -> str | None:
+        return self._state.connection_info
+
+    @_connection_info.setter
+    def _connection_info(self, value: str | None) -> None:
+        self._state.connection_info = value
+
+    @property
+    def _connection_desired(self) -> bool:
+        return self._state.connection_desired
+
+    @_connection_desired.setter
+    def _connection_desired(self, value: bool) -> None:
+        self._state.connection_desired = value
+
+    @property
+    def _reconnect_task(self) -> asyncio.Task | None:
+        return self._state.reconnect_task
+
+    @_reconnect_task.setter
+    def _reconnect_task(self, value: asyncio.Task | None) -> None:
+        self._state.reconnect_task = value
+
+    @property
+    def _last_connected(self) -> bool:
+        return self._state.last_connected
+
+    @_last_connected.setter
+    def _last_connected(self, value: bool) -> None:
+        self._state.last_connected = value
+
+    @property
+    def _reconnect_lock(self) -> asyncio.Lock | None:
+        return self._state.reconnect_lock
+
+    @_reconnect_lock.setter
+    def _reconnect_lock(self, value: asyncio.Lock | None) -> None:
+        self._state.reconnect_lock = value
+
+    @property
+    def _operation_lock(self) -> asyncio.Lock | None:
+        return self._state.operation_lock
+
+    @_operation_lock.setter
+    def _operation_lock(self, value: asyncio.Lock | None) -> None:
+        self._state.operation_lock = value
+
+    @property
+    def _setup_lock(self) -> asyncio.Lock | None:
+        return self._state.setup_lock
+
+    @_setup_lock.setter
+    def _setup_lock(self, value: asyncio.Lock | None) -> None:
+        self._state.setup_lock = value
+
+    @property
+    def _setup_in_progress(self) -> bool:
+        return self._state.setup_in_progress
+
+    @_setup_in_progress.setter
+    def _setup_in_progress(self, value: bool) -> None:
+        self._state.setup_in_progress = value
+
+    @property
+    def _setup_complete(self) -> bool:
+        return self._state.setup_complete
+
+    @_setup_complete.setter
+    def _setup_complete(self, value: bool) -> None:
+        self._state.setup_complete = value
+
+    @property
+    def _frontend_reconnect_error_broadcasts(self) -> int:
+        return self._state.frontend_reconnect_error_broadcasts
+
+    @_frontend_reconnect_error_broadcasts.setter
+    def _frontend_reconnect_error_broadcasts(self, value: int) -> None:
+        self._state.frontend_reconnect_error_broadcasts = value
+
+    @property
+    def device_info_loaded(self) -> bool:
+        return self._state.device_info_loaded
+
+    @device_info_loaded.setter
+    def device_info_loaded(self, value: bool) -> None:
+        self._state.device_info_loaded = value
+
+    @property
+    def max_contacts(self) -> int | None:
+        return self._state.max_contacts
+
+    @max_contacts.setter
+    def max_contacts(self, value: int | None) -> None:
+        self._state.max_contacts = value
+
+    @property
+    def device_model(self) -> str | None:
+        return self._state.device_model
+
+    @device_model.setter
+    def device_model(self, value: str | None) -> None:
+        self._state.device_model = value
+
+    @property
+    def firmware_build(self) -> str | None:
+        return self._state.firmware_build
+
+    @firmware_build.setter
+    def firmware_build(self, value: str | None) -> None:
+        self._state.firmware_build = value
+
+    @property
+    def firmware_version(self) -> str | None:
+        return self._state.firmware_version
+
+    @firmware_version.setter
+    def firmware_version(self, value: str | None) -> None:
+        self._state.firmware_version = value
+
+    @property
+    def max_channels(self) -> int:
+        return self._state.max_channels
+
+    @max_channels.setter
+    def max_channels(self, value: int) -> None:
+        self._state.max_channels = value
+
+    @property
+    def path_hash_mode(self) -> int:
+        return self._state.path_hash_mode
+
+    @path_hash_mode.setter
+    def path_hash_mode(self, value: int) -> None:
+        self._state.path_hash_mode = value
+
+    @path_hash_mode.deleter
+    def path_hash_mode(self) -> None:
+        self._state.path_hash_mode = 0
+
+    @property
+    def path_hash_mode_supported(self) -> bool:
+        return self._state.path_hash_mode_supported
+
+    @path_hash_mode_supported.setter
+    def path_hash_mode_supported(self, value: bool) -> None:
+        self._state.path_hash_mode_supported = value
+
+    @path_hash_mode_supported.deleter
+    def path_hash_mode_supported(self) -> None:
+        self._state.path_hash_mode_supported = False
+
+    @property
+    def _channel_slot_by_key(self):
+        return self._state.channel_slot_by_key
+
+    @_channel_slot_by_key.setter
+    def _channel_slot_by_key(self, value) -> None:
+        self._state.channel_slot_by_key = value
+
+    @property
+    def _channel_key_by_slot(self):
+        return self._state.channel_key_by_slot
+
+    @_channel_key_by_slot.setter
+    def _channel_key_by_slot(self, value) -> None:
+        self._state.channel_key_by_slot = value
+
+    @property
+    def _pending_message_channel_key_by_slot(self):
+        return self._state.pending_message_channel_key_by_slot
+
+    @_pending_message_channel_key_by_slot.setter
+    def _pending_message_channel_key_by_slot(self, value) -> None:
+        self._state.pending_message_channel_key_by_slot = value
 
     async def _acquire_operation_lock(
         self,
@@ -185,43 +345,23 @@ class RadioManager:
         blocking: bool,
     ) -> None:
         """Acquire the shared radio operation lock."""
-
-        if self._operation_lock is None:
-            self._operation_lock = asyncio.Lock()
-
-        if not blocking:
-            if self._operation_lock.locked():
-                raise RadioOperationBusyError(f"Radio is busy (operation: {name})")
-            # In single-threaded asyncio the lock cannot be acquired between the
-            # check above and the await below (no other coroutine runs until we
-            # yield). The await returns immediately for an uncontested lock.
-            await self._operation_lock.acquire()
-        else:
-            await self._operation_lock.acquire()
-
-        logger.debug("Acquired radio operation lock (%s)", name)
+        await self._state.acquire_operation_lock(name, blocking=blocking)
 
     def _release_operation_lock(self, name: str) -> None:
         """Release the shared radio operation lock."""
-        if self._operation_lock and self._operation_lock.locked():
-            self._operation_lock.release()
-            logger.debug("Released radio operation lock (%s)", name)
-        else:
-            logger.error("Attempted to release unlocked radio operation lock (%s)", name)
+        self._state.release_operation_lock(name)
+
+    async def acquire_operation_lock(self, name: str, *, blocking: bool = True) -> None:
+        """Acquire the shared radio operation lock."""
+        await self._acquire_operation_lock(name, blocking=blocking)
+
+    def release_operation_lock(self, name: str) -> None:
+        """Release the shared radio operation lock."""
+        self._release_operation_lock(name)
 
     def _reset_connected_runtime_state(self) -> None:
         """Clear cached runtime state after a transport teardown completes."""
-        self._setup_complete = False
-        self.device_info_loaded = False
-        self.max_contacts = None
-        self.device_model = None
-        self.firmware_build = None
-        self.firmware_version = None
-        self.max_channels = 40
-        self.path_hash_mode = 0
-        self.path_hash_mode_supported = False
-        self.reset_channel_send_cache()
-        self.clear_pending_message_channel_slots()
+        self._state.reset_connected_runtime_state()
 
     @asynccontextmanager
     async def radio_operation(
diff --git a/app/radio_runtime_state.py b/app/radio_runtime_state.py
new file mode 100644
index 0000000..1ab0829
--- /dev/null
+++ b/app/radio_runtime_state.py
@@ -0,0 +1,187 @@
+import asyncio
+import logging
+from collections import OrderedDict
+
+from app.config import settings
+
+logger = logging.getLogger(__name__)
+
+
+class RadioOperationError(RuntimeError):
+    """Base class for shared radio operation lock errors."""
+
+
+class RadioOperationBusyError(RadioOperationError):
+    """Raised when a non-blocking radio operation cannot acquire the lock."""
+
+
+class RadioDisconnectedError(RadioOperationError):
+    """Raised when the radio disconnects between pre-check and lock acquisition."""
+
+
+class RadioRuntimeState:
+    """Mutable runtime state for one live radio session manager."""
+
+    def __init__(self) -> None:
+        self.connection_info: str | None = None
+        self.connection_desired: bool = True
+        self.reconnect_task: asyncio.Task | None = None
+        self.last_connected: bool = False
+        self.reconnect_lock: asyncio.Lock | None = None
+        self.operation_lock: asyncio.Lock | None = None
+        self.setup_lock: asyncio.Lock | None = None
+        self.setup_in_progress: bool = False
+        self.setup_complete: bool = False
+        self.frontend_reconnect_error_broadcasts: int = 0
+        self.device_info_loaded: bool = False
+        self.max_contacts: int | None = None
+        self.device_model: str | None = None
+        self.firmware_build: str | None = None
+        self.firmware_version: str | None = None
+        self.max_channels: int = 40
+        self.path_hash_mode: int = 0
+        self.path_hash_mode_supported: bool = False
+        self.channel_slot_by_key: OrderedDict[str, int] = OrderedDict()
+        self.channel_key_by_slot: dict[int, str] = {}
+        self.pending_message_channel_key_by_slot: dict[int, str] = {}
+
+    @property
+    def is_reconnecting(self) -> bool:
+        return self.reconnect_lock is not None and self.reconnect_lock.locked()
+
+    async def acquire_operation_lock(self, name: str, *, blocking: bool) -> None:
+        if self.operation_lock is None:
+            self.operation_lock = asyncio.Lock()
+
+        if not blocking:
+            if self.operation_lock.locked():
+                raise RadioOperationBusyError(f"Radio is busy (operation: {name})")
+            # No coroutine can acquire the lock between the check above and
+            # this await because we have not yielded yet.
+            await self.operation_lock.acquire()
+        else:
+            await self.operation_lock.acquire()
+
+        logger.debug("Acquired radio operation lock (%s)", name)
+
+    def release_operation_lock(self, name: str) -> None:
+        if self.operation_lock and self.operation_lock.locked():
+            self.operation_lock.release()
+            logger.debug("Released radio operation lock (%s)", name)
+        else:
+            logger.error("Attempted to release unlocked radio operation lock (%s)", name)
+
+    def reset_connected_runtime_state(self) -> None:
+        self.setup_complete = False
+        self.device_info_loaded = False
+        self.max_contacts = None
+        self.device_model = None
+        self.firmware_build = None
+        self.firmware_version = None
+        self.max_channels = 40
+        self.path_hash_mode = 0
+        self.path_hash_mode_supported = False
+        self.reset_channel_send_cache()
+        self.clear_pending_message_channel_slots()
+
+    def reset_channel_send_cache(self) -> None:
+        self.channel_slot_by_key.clear()
+        self.channel_key_by_slot.clear()
+
+    def remember_pending_message_channel_slot(self, channel_key: str, slot: int) -> None:
+        self.pending_message_channel_key_by_slot[slot] = channel_key.upper()
+
+    def get_pending_message_channel_key(self, slot: int) -> str | None:
+        return self.pending_message_channel_key_by_slot.get(slot)
+
+    def clear_pending_message_channel_slots(self) -> None:
+        self.pending_message_channel_key_by_slot.clear()
+
+    def channel_slot_reuse_enabled(self) -> bool:
+        if settings.force_channel_slot_reconfigure:
+            return False
+        if self.connection_info:
+            return not self.connection_info.startswith("TCP:")
+        return settings.connection_type != "tcp"
+
+    def get_channel_send_cache_capacity(self) -> int:
+        try:
+            return max(1, int(self.max_channels))
+        except (TypeError, ValueError):
+            return 1
+
+    def get_cached_channel_slot(self, channel_key: str) -> int | None:
+        return self.channel_slot_by_key.get(channel_key.upper())
+
+    def plan_channel_send_slot(
+        self,
+        channel_key: str,
+        *,
+        preferred_slot: int = 0,
+    ) -> tuple[int, bool, str | None]:
+        if not self.channel_slot_reuse_enabled():
+            return preferred_slot, True, None
+
+        normalized_key = channel_key.upper()
+        cached_slot = self.channel_slot_by_key.get(normalized_key)
+        if cached_slot is not None:
+            return cached_slot, False, None
+
+        capacity = self.get_channel_send_cache_capacity()
+        if len(self.channel_slot_by_key) < capacity:
+            slot = self._find_first_free_channel_slot(capacity, preferred_slot)
+            return slot, True, None
+
+        evicted_key, slot = next(iter(self.channel_slot_by_key.items()))
+        return slot, True, evicted_key
+
+    def note_channel_slot_loaded(self, channel_key: str, slot: int) -> None:
+        if not self.channel_slot_reuse_enabled():
+            return
+
+        normalized_key = channel_key.upper()
+        previous_slot = self.channel_slot_by_key.pop(normalized_key, None)
+        if previous_slot is not None and previous_slot != slot:
+            self.channel_key_by_slot.pop(previous_slot, None)
+
+        displaced_key = self.channel_key_by_slot.get(slot)
+        if displaced_key is not None and displaced_key != normalized_key:
+            self.channel_slot_by_key.pop(displaced_key, None)
+
+        self.channel_key_by_slot[slot] = normalized_key
+        self.channel_slot_by_key[normalized_key] = slot
+
+    def note_channel_slot_used(self, channel_key: str) -> None:
+        if not self.channel_slot_reuse_enabled():
+            return
+
+        normalized_key = channel_key.upper()
+        slot = self.channel_slot_by_key.get(normalized_key)
+        if slot is None:
+            return
+        self.channel_slot_by_key.move_to_end(normalized_key)
+        self.channel_key_by_slot[slot] = normalized_key
+
+    def invalidate_cached_channel_slot(self, channel_key: str) -> None:
+        normalized_key = channel_key.upper()
+        slot = self.channel_slot_by_key.pop(normalized_key, None)
+        if slot is None:
+            return
+        if self.channel_key_by_slot.get(slot) == normalized_key:
+            self.channel_key_by_slot.pop(slot, None)
+
+    def get_channel_send_cache_snapshot(self) -> list[tuple[str, int]]:
+        return list(self.channel_slot_by_key.items())
+
+    def reset_reconnect_error_broadcasts(self) -> None:
+        self.frontend_reconnect_error_broadcasts = 0
+
+    def _find_first_free_channel_slot(self, capacity: int, preferred_slot: int) -> int:
+        if preferred_slot < capacity and preferred_slot not in self.channel_key_by_slot:
+            return preferred_slot
+
+        for slot in range(capacity):
+            if slot not in self.channel_key_by_slot:
+                return slot
+
+        return preferred_slot
diff --git a/app/services/radio_runtime.py b/app/services/radio_runtime.py
index a5649c5..aebe360 100644
--- a/app/services/radio_runtime.py
+++ b/app/services/radio_runtime.py
@@ -1,8 +1,8 @@
-"""Shared access seam over the global RadioManager instance.
+"""Shared access seam over the process-global radio runtime.
 
-This module deliberately keeps behavior thin and forwarding-only. The goal is
-to reduce direct `app.radio.radio_manager` imports across routers and helpers
-without changing radio lifecycle, lock, or connection semantics.
+The runtime object is the public boundary for application code. It exposes the
+current manager plus its mutable session state through an explicit API instead
+of forwarding arbitrary attribute access to the manager instance.
 """
 
 from collections.abc import Callable
@@ -15,7 +15,7 @@ import app.radio as radio_module
 
 
 class RadioRuntime:
-    """Thin forwarding wrapper around the process-global RadioManager."""
+    """Explicit access seam over the process-global RadioManager."""
 
     def __init__(self, manager_or_getter=None):
         if manager_or_getter is None:
@@ -30,24 +30,90 @@ class RadioRuntime:
         return self._manager_getter()
 
     def __getattr__(self, name: str) -> Any:
-        """Forward unknown attributes to the current global manager."""
-        return getattr(self.manager, name)
+        raise AttributeError(
+            f"{type(self).__name__!s} does not expose attribute {name!r}. "
+            "Use an explicit RadioRuntime property or method."
+        )
 
-    @staticmethod
-    def _is_local_runtime_attr(name: str) -> bool:
-        return name.startswith("_") or hasattr(RadioRuntime, name)
+    @property
+    def state(self) -> Any:
+        return self.manager.state
 
-    def __setattr__(self, name: str, value: Any) -> None:
-        if self._is_local_runtime_attr(name):
-            object.__setattr__(self, name, value)
-            return
-        setattr(self.manager, name, value)
+    @property
+    def meshcore(self) -> Any:
+        return self.manager.meshcore
 
-    def __delattr__(self, name: str) -> None:
-        if self._is_local_runtime_attr(name):
-            object.__delattr__(self, name)
-            return
-        delattr(self.manager, name)
+    @property
+    def connection_info(self) -> str | None:
+        return self.manager.connection_info
+
+    @property
+    def is_connected(self) -> bool:
+        return self.manager.is_connected
+
+    @property
+    def is_reconnecting(self) -> bool:
+        return self.manager.is_reconnecting
+
+    @property
+    def is_setup_in_progress(self) -> bool:
+        return self.manager.is_setup_in_progress
+
+    @property
+    def is_setup_complete(self) -> bool:
+        return self.manager.is_setup_complete
+
+    @property
+    def connection_desired(self) -> bool:
+        return self.manager.connection_desired
+
+    @property
+    def max_contacts(self) -> int | None:
+        return self.state.max_contacts
+
+    @max_contacts.setter
+    def max_contacts(self, value: int | None) -> None:
+        self.state.max_contacts = value
+
+    @property
+    def max_channels(self) -> int:
+        return self.state.max_channels
+
+    @max_channels.setter
+    def max_channels(self, value: int) -> None:
+        self.state.max_channels = value
+
+    @property
+    def path_hash_mode(self) -> int:
+        return self.state.path_hash_mode
+
+    @path_hash_mode.setter
+    def path_hash_mode(self, value: int) -> None:
+        self.state.path_hash_mode = value
+
+    @property
+    def path_hash_mode_supported(self) -> bool:
+        return self.state.path_hash_mode_supported
+
+    @path_hash_mode_supported.setter
+    def path_hash_mode_supported(self, value: bool) -> None:
+        self.state.path_hash_mode_supported = value
+
+    @property
+    def device_info_loaded(self) -> bool:
+        return self.state.device_info_loaded
+
+    @property
+    def device_model(self) -> str | None:
+        return self.state.device_model
+
+    @property
+    def firmware_build(self) -> str | None:
+        return self.state.firmware_build
+
+    @property
+    def firmware_version(self) -> str | None:
+        return self.state.firmware_version
 
     def require_connected(self):
         """Return MeshCore when available, mirroring existing HTTP semantics."""
@@ -89,5 +155,52 @@ class RadioRuntime:
             broadcast_on_success=broadcast_on_success,
         )
 
+    def reset_channel_send_cache(self) -> None:
+        self.state.reset_channel_send_cache()
+
+    def remember_pending_message_channel_slot(self, channel_key: str, slot: int) -> None:
+        self.state.remember_pending_message_channel_slot(channel_key, slot)
+
+    def get_pending_message_channel_key(self, slot: int) -> str | None:
+        return self.state.get_pending_message_channel_key(slot)
+
+    def clear_pending_message_channel_slots(self) -> None:
+        self.state.clear_pending_message_channel_slots()
+
+    def channel_slot_reuse_enabled(self) -> bool:
+        return self.state.channel_slot_reuse_enabled()
+
+    def get_channel_send_cache_capacity(self) -> int:
+        return self.state.get_channel_send_cache_capacity()
+
+    def get_cached_channel_slot(self, channel_key: str) -> int | None:
+        return self.state.get_cached_channel_slot(channel_key)
+
+    def plan_channel_send_slot(
+        self,
+        channel_key: str,
+        *,
+        preferred_slot: int = 0,
+    ) -> tuple[int, bool, str | None]:
+        return self.state.plan_channel_send_slot(channel_key, preferred_slot=preferred_slot)
+
+    def note_channel_slot_loaded(self, channel_key: str, slot: int) -> None:
+        self.state.note_channel_slot_loaded(channel_key, slot)
+
+    def note_channel_slot_used(self, channel_key: str) -> None:
+        self.state.note_channel_slot_used(channel_key)
+
+    def invalidate_cached_channel_slot(self, channel_key: str) -> None:
+        self.state.invalidate_cached_channel_slot(channel_key)
+
+    def get_channel_send_cache_snapshot(self) -> list[tuple[str, int]]:
+        return self.state.get_channel_send_cache_snapshot()
+
+    def resume_connection(self) -> None:
+        self.manager.resume_connection()
+
+    async def pause_connection(self) -> None:
+        await self.manager.pause_connection()
+
 
 radio_runtime = RadioRuntime()
diff --git a/tests/test_radio_runtime_service.py b/tests/test_radio_runtime_service.py
index 41ae42e..cb6e5ed 100644
--- a/tests/test_radio_runtime_service.py
+++ b/tests/test_radio_runtime_service.py
@@ -4,6 +4,7 @@ from unittest.mock import AsyncMock
 import pytest
 from fastapi import HTTPException
 
+from app.radio_runtime_state import RadioRuntimeState
 from app.services.radio_runtime import RadioRuntime
 
 
@@ -114,3 +115,17 @@ async def test_lifecycle_passthrough_methods_delegate_to_current_manager():
     manager.start_connection_monitor.assert_awaited_once()
     manager.stop_connection_monitor.assert_awaited_once()
     manager.disconnect.assert_awaited_once()
+
+
+def test_explicit_runtime_state_api_replaces_attribute_forwarding():
+    manager = _Manager(meshcore="meshcore", is_connected=True)
+    manager.state = RadioRuntimeState()
+    manager.state.path_hash_mode = 2
+    runtime = RadioRuntime(manager)
+
+    assert runtime.path_hash_mode == 2
+    runtime.path_hash_mode = 1
+    assert manager.state.path_hash_mode == 1
+
+    with pytest.raises(AttributeError, match="does not expose attribute"):
+        _ = runtime.some_random_attr