feat(cloud): skip MCP-busy devices in scheduler

packages/cloud-platform/cloud/pool.py

@@ -47,6 +47,7 @@ class PooledDevice:
     status: PooledDeviceStatus
     capability_tags: list[str] = field(default_factory=list)
     synced_at: datetime | None = None
+    mcp_busy: bool = False
 
 
 class DevicePool:
@@ -64,6 +65,7 @@ class DevicePool:
         address: str | None = None,
         planner_transport: Literal["direct", "cloud"] = "direct",
         allow_device_takeover: bool = False,
+        mcp_busy_device_ids: list[str] | None = None,
     ) -> None:
         """Push a host's current device snapshot into the pool.
 
@@ -78,7 +80,13 @@ class DevicePool:
             last_seen_at=now,
             planner_transport=planner_transport,
         )
-        devices = [self._to_pooled(device, host_id, now) for device in snapshot]
+        busy_set = set(mcp_busy_device_ids or [])
+        devices = [
+            self._to_pooled(
+                device, host_id, now, mcp_busy=device.id in busy_set
+            )
+            for device in snapshot
+        ]
         if allow_device_takeover:
             self.store.replace_host_devices(
                 host_id,
@@ -119,6 +127,8 @@ class DevicePool:
         device: Device,
         host_id: str,
         synced_at: datetime,
+        *,
+        mcp_busy: bool = False,
     ) -> PooledDevice:
         raw_status = (
             device.status if device.status in _HOST_REPORTED_STATUSES else "idle"
@@ -131,6 +141,7 @@ class DevicePool:
             status=raw_status,  # type: ignore[arg-type]
             capability_tags=tags,
             synced_at=synced_at,
+            mcp_busy=mcp_busy,
         )
 
     def _is_stale(self, host: HostRegistration, now: datetime) -> bool: