diff --git a/tractor/__init__.py b/tractor/__init__.py
index f5146ad..569760f 100644
--- a/tractor/__init__.py
+++ b/tractor/__init__.py
@@ -3,6 +3,7 @@ tractor: An actor model micro-framework built on
          ``trio`` and ``multiprocessing``.
 """
 from functools import partial
+import typing
 
 import trio
 
@@ -32,7 +33,13 @@ _default_arbiter_host = '127.0.0.1'
 _default_arbiter_port = 1616
 
 
-async def _main(async_fn, args, kwargs, name, arbiter_addr):
+async def _main(
+    async_fn: typing.Callable[..., typing.Awaitable],
+    args: tuple,
+    kwargs: dict,
+    name: str,
+    arbiter_addr: (str, int)
+) -> typing.Any:
     """Async entry point for ``tractor``.
     """
     log = get_logger('tractor')
@@ -73,11 +80,11 @@ async def _main(async_fn, args, kwargs, name, arbiter_addr):
 
 
 def run(
-    async_fn,
-    *args,
-    name=None,
-    arbiter_addr=(_default_arbiter_host, _default_arbiter_port),
-    **kwargs
+    async_fn: typing.Callable[..., typing.Awaitable],
+    *args: ...,
+    name: str = None,
+    arbiter_addr: (str, int) = (_default_arbiter_host, _default_arbiter_port),
+    **kwargs: ...
 ):
     """Run a trio-actor async function in process.
 
diff --git a/tractor/_actor.py b/tractor/_actor.py
index a5e833f..4be6381 100644
--- a/tractor/_actor.py
+++ b/tractor/_actor.py
@@ -1,13 +1,14 @@
 """
 Actor primitives and helpers
 """
-import inspect
-import importlib
 from collections import defaultdict
 from functools import partial
-import traceback
-import uuid
 from itertools import chain
+import importlib
+import inspect
+import traceback
+import typing
+import uuid
 
 import trio
 from async_generator import asynccontextmanager, aclosing
@@ -36,8 +37,11 @@ class InternalActorError(RuntimeError):
 
 
 async def _invoke(
-    actor, cid, chan, func, kwargs,
-    treat_as_gen=False,
+    actor: 'Actor',
+    cid: str,
+    chan: Channel,
+    func: typing.Callable,
+    kwargs: dict,
     task_status=trio.TASK_STATUS_IGNORED
 ):
     """Invoke local func and return results over provided channel.
@@ -169,7 +173,7 @@ class Actor:
         self._accept_host = None
         self._forkserver_info = None
 
-    async def wait_for_peer(self, uid):
+    async def wait_for_peer(self, uid: (str, str)) -> (trio.Event, Channel):
         """Wait for a connection back from a spawned actor with a given
         ``uid``.
         """
@@ -179,7 +183,7 @@ class Actor:
         log.debug(f"{uid} successfully connected back to us")
         return event, self._peers[uid][-1]
 
-    def load_namespaces(self):
+    def load_namespaces(self) -> None:
         # We load namespaces after fork since this actor may
         # be spawned on a different machine from the original nursery
         # and we need to try and load the local module code (if it
@@ -198,7 +202,7 @@ class Actor:
     async def _stream_handler(
         self,
         stream: trio.SocketStream,
-    ):
+    ) -> None:
         """Entry point for new inbound connections to the channel server.
         """
         self._no_more_peers.clear()
@@ -256,19 +260,21 @@ class Actor:
                 await chan.send(None)
                 await chan.aclose()
 
-    async def _push_result(self, actorid, cid, msg):
+    async def _push_result(self, actorid, cid: str, msg: dict) -> None:
         assert actorid, f"`actorid` can't be {actorid}"
         q = self.get_waitq(actorid, cid)
         log.debug(f"Delivering {msg} from {actorid} to caller {cid}")
         # maintain backpressure
         await q.put(msg)
 
-    def get_waitq(self, actorid, cid):
+    def get_waitq(self, actorid: (str, str), cid: str) -> trio.Queue:
         log.debug(f"Getting result queue for {actorid} cid {cid}")
         cids2qs = self._actors2calls.setdefault(actorid, {})
         return cids2qs.setdefault(cid, trio.Queue(1000))
 
-    async def send_cmd(self, chan, ns, func, kwargs):
+    async def send_cmd(
+        self, chan: Channel, ns: str, func: str, kwargs: dict
+    ) -> (str, trio.Queue):
         """Send a ``'cmd'`` message to a remote actor and return a
         caller id and a ``trio.Queue`` that can be used to wait for
         responses delivered by the local message processing loop.
@@ -279,7 +285,9 @@ class Actor:
         await chan.send({'cmd': (ns, func, kwargs, self.uid, cid)})
         return cid, q
 
-    async def _process_messages(self, chan, treat_as_gen=False):
+    async def _process_messages(
+        self, chan: Channel, treat_as_gen: bool = False
+    ) -> None:
         """Process messages async-RPC style.
 
         Process rpc requests and deliver retrieved responses from channels.
@@ -371,7 +379,11 @@ class Actor:
         finally:
             log.debug(f"Exiting msg loop for {chan} from {chan.uid}")
 
-    def _fork_main(self, accept_addr, forkserver_info, parent_addr=None):
+    def _fork_main(
+        self, accept_addr: (str, int),
+        forkserver_info: tuple,
+        parent_addr: (str, int) = None
+    ) -> None:
         # after fork routine which invokes a fresh ``trio.run``
         # log.warn("Log level after fork is {self.loglevel}")
         self._forkserver_info = forkserver_info
@@ -391,22 +403,17 @@ class Actor:
 
     async def _async_main(
         self,
-        accept_addr,
-        arbiter_addr=None,
-        parent_addr=None,
-        _main_coro=None,
-        task_status=trio.TASK_STATUS_IGNORED,
-    ):
+        accept_addr: (str, int),
+        arbiter_addr: (str, int) = None,
+        parent_addr: (str, int) = None,
+        task_status: trio._core._run._TaskStatus = trio.TASK_STATUS_IGNORED,
+    ) -> None:
         """Start the channel server, maybe connect back to the parent, and
         start the main task.
 
         A "root-most" (or "top-level") nursery for this actor is opened here
         and when cancelled effectively cancels the actor.
         """
-        # if this is the `MainProcess` then we get a ref to the main
-        # task's coroutine object for tossing errors into
-        self._main_coro = _main_coro
-
         arbiter_addr = arbiter_addr or self._arb_addr
         registered_with_arbiter = False
         try:
@@ -422,12 +429,6 @@ class Actor:
                     self._serve_forever, accept_host=host, accept_port=port)
                 )
 
-                # XXX: I wonder if a better name is maybe "requester"
-                # since I don't think the notion of a "parent" actor
-                # necessarily sticks given that eventually we want
-                # ``'MainProcess'`` (the actor who initially starts the
-                # forkserver) to eventually be the only one who is
-                # allowed to spawn new processes per Python program.
                 if parent_addr is not None:
                     try:
                         # Connect back to the parent actor and conduct initial
@@ -502,10 +503,10 @@ class Actor:
         self,
         *,
         # (host, port) to bind for channel server
-        accept_host=None,
-        accept_port=0,
-        task_status=trio.TASK_STATUS_IGNORED
-    ):
+        accept_host: (str, int) = None,
+        accept_port: int = 0,
+        task_status: trio._core._run._TaskStatus = trio.TASK_STATUS_IGNORED,
+    ) -> None:
         """Start the channel server, begin listening for new connections.
 
         This will cause an actor to continue living (blocking) until
@@ -531,7 +532,7 @@ class Actor:
             self._listeners.extend(listeners)
             task_status.started()
 
-    async def _do_unreg(self, arbiter_addr):
+    async def _do_unreg(self, arbiter_addr: (str, int)) -> None:
         # UNregister actor from the arbiter
         try:
             if arbiter_addr is not None:
@@ -541,7 +542,7 @@ class Actor:
         except OSError:
             log.warn(f"Unable to unregister {self.name} from arbiter")
 
-    async def cancel(self):
+    async def cancel(self) -> None:
         """Cancel this actor.
 
         The sequence in order is:
@@ -554,7 +555,7 @@ class Actor:
         self.cancel_server()
         self._root_nursery.cancel_scope.cancel()
 
-    async def cancel_rpc_tasks(self):
+    async def cancel_rpc_tasks(self) -> None:
         """Cancel all existing RPC responder tasks using the cancel scope
         registered for each.
         """
@@ -570,7 +571,7 @@ class Actor:
                 f"Waiting for remaining rpc tasks to complete {scopes}")
             await self._no_more_rpc_tasks.wait()
 
-    def cancel_server(self):
+    def cancel_server(self) -> None:
         """Cancel the internal channel server nursery thereby
         preventing any new inbound connections from being established.
         """
@@ -578,7 +579,7 @@ class Actor:
         self._server_nursery.cancel_scope.cancel()
 
     @property
-    def accept_addr(self):
+    def accept_addr(self) -> (str, int):
         """Primary address to which the channel server is bound.
         """
         try:
@@ -586,11 +587,13 @@ class Actor:
         except OSError:
             return
 
-    def get_parent(self):
+    def get_parent(self) -> Portal:
+        """Return a portal to our parent actor."""
         return Portal(self._parent_chan)
 
-    def get_chans(self, actorid):
-        return self._peers[actorid]
+    def get_chans(self, uid: (str, str)) -> [Channel]:
+        """Return all channels to the actor with provided uid."""
+        return self._peers[uid]
 
 
 class Arbiter(Actor):
@@ -609,12 +612,12 @@ class Arbiter(Actor):
         self._waiters = {}
         super().__init__(*args, **kwargs)
 
-    def find_actor(self, name):
+    def find_actor(self, name: str) -> (str, int):
         for uid, sockaddr in self._registry.items():
             if name in uid:
                 return sockaddr
 
-    async def wait_for_actor(self, name):
+    async def wait_for_actor(self, name: str) -> [(str, int)]:
         """Wait for a particular actor to register.
 
         This is a blocking call if no actor by the provided name is currently
@@ -635,7 +638,7 @@ class Arbiter(Actor):
 
         return sockaddrs
 
-    def register_actor(self, uid, sockaddr):
+    def register_actor(self, uid: (str, str), sockaddr: (str, int)) -> None:
         name, uuid = uid
         self._registry[uid] = sockaddr
 
@@ -645,13 +648,20 @@ class Arbiter(Actor):
         for event in events:
             event.set()
 
-    def unregister_actor(self, uid):
+    def unregister_actor(self, uid: (str, str)) -> None:
         self._registry.pop(uid, None)
 
 
-async def _start_actor(actor, main, host, port, arbiter_addr, nursery=None):
-    """Spawn a local actor by starting a task to execute it's main
-    async function.
+async def _start_actor(
+    actor: Actor,
+    main: typing.Coroutine,
+    host: str,
+    port: int,
+    arbiter_addr: (str, int),
+    nursery: trio._core._run.Nursery = None
+):
+    """Spawn a local actor by starting a task to execute it's main async
+    function.
 
     Blocks if no nursery is provided, in which case it is expected the nursery
     provider is responsible for waiting on the task to complete.
@@ -664,29 +674,22 @@ async def _start_actor(actor, main, host, port, arbiter_addr, nursery=None):
     log.info(f"Starting local {actor} @ {host}:{port}")
 
     async with trio.open_nursery() as nursery:
-
-        if main is not None:
-            main_coro = main()
-
         await nursery.start(
             partial(
                 actor._async_main,
                 accept_addr=(host, port),
                 parent_addr=None,
                 arbiter_addr=arbiter_addr,
-                _main_coro=main_coro
             )
         )
         if main is not None:
-            result = await main_coro
+            result = await main()
 
         # XXX: If spawned with a dedicated "main function",
         # the actor is cancelled when this context is complete
         # given that there are no more active peer channels connected
         actor.cancel_server()
 
-    # block on actor to complete
-
     # unset module state
     _state._current_actor = None
     log.info("Completed async main")
@@ -695,7 +698,7 @@ async def _start_actor(actor, main, host, port, arbiter_addr, nursery=None):
 
 
 @asynccontextmanager
-async def get_arbiter(host, port):
+async def get_arbiter(host: str, port: int) -> Portal:
     """Return a portal instance connected to a local or remote
     arbiter.
     """
@@ -714,10 +717,7 @@ async def get_arbiter(host, port):
 
 
 @asynccontextmanager
-async def find_actor(
-    name,
-    arbiter_sockaddr=None,
-):
+async def find_actor(name: str, arbiter_sockaddr: (str, int) = None) -> Portal:
     """Ask the arbiter to find actor(s) by name.
 
     Returns a connected portal to the last registered matching actor
@@ -738,9 +738,9 @@ async def find_actor(
 
 @asynccontextmanager
 async def wait_for_actor(
-    name,
-    arbiter_sockaddr=None,
-):
+    name: str,
+    arbiter_sockaddr: (str, int) = None
+) -> Portal:
     """Wait on an actor to register with the arbiter.
 
     A portal to the first actor which registered is be returned.
diff --git a/tractor/_ipc.py b/tractor/_ipc.py
index 2d86e56..87ef4e3 100644
--- a/tractor/_ipc.py
+++ b/tractor/_ipc.py
@@ -1,7 +1,7 @@
 """
 Inter-process comms abstractions
 """
-from typing import Coroutine, Tuple
+import typing
 
 import msgpack
 import trio
@@ -14,14 +14,14 @@ log = get_logger('ipc')
 class StreamQueue:
     """Stream wrapped as a queue that delivers ``msgpack`` serialized objects.
     """
-    def __init__(self, stream):
+    def __init__(self, stream: trio.SocketStream):
         self.stream = stream
         self._agen = self._iter_packets()
         self._laddr = self.stream.socket.getsockname()[:2]
         self._raddr = self.stream.socket.getpeername()[:2]
         self._send_lock = trio.Lock()
 
-    async def _iter_packets(self):
+    async def _iter_packets(self) -> typing.AsyncGenerator[dict, None]:
         """Yield packets from the underlying stream.
         """
         unpacker = msgpack.Unpacker(raw=False, use_list=False)
@@ -42,25 +42,25 @@ class StreamQueue:
                 yield packet
 
     @property
-    def laddr(self):
+    def laddr(self) -> (str, int):
         return self._laddr
 
     @property
-    def raddr(self):
+    def raddr(self) -> (str, int):
         return self._raddr
 
-    async def put(self, data):
+    async def put(self, data: typing.Any) -> int:
         async with self._send_lock:
             return await self.stream.send_all(
                 msgpack.dumps(data, use_bin_type=True))
 
-    async def get(self):
+    async def get(self) -> typing.Any:
         return await self._agen.asend(None)
 
     def __aiter__(self):
         return self._agen
 
-    def connected(self):
+    def connected(self) -> bool:
         return self.stream.socket.fileno() != -1
 
 
@@ -73,7 +73,7 @@ class Channel:
     def __init__(
         self,
         destaddr: tuple = None,
-        on_reconnect: Coroutine = None,
+        on_reconnect: typing.Coroutine = None,
         auto_reconnect: bool = False,
         stream: trio.SocketStream = None,  # expected to be active
     ) -> None:
@@ -89,7 +89,7 @@ class Channel:
         self.uid = None
         self._agen = self._aiter_recv()
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         if self.squeue:
             return repr(
                 self.squeue.stream.socket._sock).replace(
@@ -97,14 +97,16 @@ class Channel:
         return object.__repr__(self)
 
     @property
-    def laddr(self):
+    def laddr(self) -> (str, int):
         return self.squeue.laddr if self.squeue else (None, None)
 
     @property
-    def raddr(self):
+    def raddr(self) -> (str, int):
         return self.squeue.raddr if self.squeue else (None, None)
 
-    async def connect(self, destaddr: Tuple[str, int] = None, **kwargs):
+    async def connect(
+        self, destaddr: typing.Tuple[str, int] = None, **kwargs
+    ) -> trio.SocketStream:
         if self.connected():
             raise RuntimeError("channel is already connected?")
         destaddr = destaddr or self._destaddr
@@ -112,11 +114,11 @@ class Channel:
         self.squeue = StreamQueue(stream)
         return stream
 
-    async def send(self, item):
+    async def send(self, item: typing.Any) -> None:
         log.trace(f"send `{item}`")
         await self.squeue.put(item)
 
-    async def recv(self):
+    async def recv(self) -> typing.Any:
         try:
             return await self.squeue.get()
         except trio.BrokenStreamError:
@@ -124,7 +126,7 @@ class Channel:
                 await self._reconnect()
                 return await self.recv()
 
-    async def aclose(self, *args):
+    async def aclose(self) -> None:
         log.debug(f"Closing {self}")
         await self.squeue.stream.aclose()
 
@@ -138,7 +140,7 @@ class Channel:
     def __aiter__(self):
         return self._agen
 
-    async def _reconnect(self):
+    async def _reconnect(self) -> None:
         """Handle connection failures by polling until a reconnect can be
         established.
         """
@@ -167,7 +169,9 @@ class Channel:
                         " for re-establishment")
                 await trio.sleep(1)
 
-    async def _aiter_recv(self):
+    async def _aiter_recv(
+        self
+    ) -> typing.AsyncGenerator[typing.Any, None]:
         """Async iterate items from underlying stream.
         """
         while True:
@@ -189,14 +193,16 @@ class Channel:
             else:
                 return
 
-    def connected(self):
+    def connected(self) -> bool:
         return self.squeue.connected() if self.squeue else False
 
 
 @asynccontextmanager
-async def _connect_chan(host, port):
-    """Create and connect a channel with disconnect on
-    context manager teardown.
+async def _connect_chan(
+    host: str, port: int
+) -> typing.AsyncContextManager[Channel]:
+    """Create and connect a channel with disconnect on context manager
+    teardown.
     """
     chan = Channel((host, port))
     await chan.connect()
diff --git a/tractor/_portal.py b/tractor/_portal.py
index 835f918..6087509 100644
--- a/tractor/_portal.py
+++ b/tractor/_portal.py
@@ -2,6 +2,7 @@
 Portal api
 """
 import importlib
+import typing
 
 import trio
 from async_generator import asynccontextmanager
@@ -18,7 +19,7 @@ class RemoteActorError(RuntimeError):
 
 
 @asynccontextmanager
-async def maybe_open_nursery(nursery=None):
+async def maybe_open_nursery(nursery: trio._core._run.Nursery = None):
     """Create a new nursery if None provided.
 
     Blocks on exit as expected if no input nursery is provided.
@@ -30,7 +31,7 @@ async def maybe_open_nursery(nursery=None):
             yield nursery
 
 
-async def _do_handshake(actor, chan):
+async def _do_handshake(actor: 'Actor', chan: 'Channel') -> (str, str):
     await chan.send(actor.uid)
     uid = await chan.recv()
 
@@ -51,7 +52,7 @@ class Portal:
 
     Think of this like an native async IPC API.
     """
-    def __init__(self, channel):
+    def __init__(self, channel: 'Channel'):
         self.channel = channel
         # when this is set to a tuple returned from ``_submit()`` then
         # it is expected that ``result()`` will be awaited at some point
@@ -60,13 +61,15 @@ class Portal:
         self._exc = None
         self._expect_result = None
 
-    async def aclose(self):
+    async def aclose(self) -> None:
         log.debug(f"Closing {self}")
         # XXX: won't work until https://github.com/python-trio/trio/pull/460
         # gets in!
         await self.channel.aclose()
 
-    async def _submit(self, ns, func, **kwargs):
+    async def _submit(
+        self, ns: str, func: str, **kwargs
+    ) -> (str, trio.Queue, str, dict):
         """Submit a function to be scheduled and run by actor, return the
         associated caller id, response queue, response type str,
         first message packet as a tuple.
@@ -93,12 +96,12 @@ class Portal:
 
         return cid, q, resp_type, first_msg
 
-    async def _submit_for_result(self, ns, func, **kwargs):
+    async def _submit_for_result(self, ns: str, func: str, **kwargs) -> None:
         assert self._expect_result is None, \
                 "A pending main result has already been submitted"
         self._expect_result = await self._submit(ns, func, **kwargs)
 
-    async def run(self, ns, func, **kwargs):
+    async def run(self, ns: str, func: str, **kwargs) -> typing.Any:
         """Submit a function to be scheduled and run by actor, wrap and return
         its (stream of) result(s).
 
@@ -108,7 +111,9 @@ class Portal:
             *(await self._submit(ns, func, **kwargs))
         )
 
-    async def _return_from_resptype(self, cid, q, resptype, first_msg):
+    async def _return_from_resptype(
+        self, cid: str, q: trio.Queue, resptype: str, first_msg: dict
+    ) -> typing.Any:
         # TODO: not this needs some serious work and thinking about how
         # to make async-generators the fundamental IPC API over channels!
         # (think `yield from`, `gen.send()`, and functional reactive stuff)
@@ -145,7 +150,7 @@ class Portal:
         else:
             raise ValueError(f"Unknown msg response type: {first_msg}")
 
-    async def result(self):
+    async def result(self) -> typing.Any:
         """Return the result(s) from the remote actor's "main" task.
         """
         if self._expect_result is None:
@@ -165,13 +170,13 @@ class Portal:
             )
         return self._result
 
-    async def close(self):
+    async def close(self) -> None:
         # trigger remote msg loop `break`
         chan = self.channel
         log.debug(f"Closing portal for {chan} to {chan.uid}")
         await self.channel.send(None)
 
-    async def cancel_actor(self):
+    async def cancel_actor(self) -> bool:
         """Cancel the actor on the other end of this portal.
         """
         log.warn(
@@ -198,10 +203,10 @@ class LocalPortal:
     A compatibility shim for normal portals but for invoking functions
     using an in process actor instance.
     """
-    def __init__(self, actor):
+    def __init__(self, actor: 'Actor'):
         self.actor = actor
 
-    async def run(self, ns, func, **kwargs):
+    async def run(self, ns: str, func: str, **kwargs) -> typing.Any:
         """Run a requested function locally and return it's result.
         """
         obj = self.actor if ns == 'self' else importlib.import_module(ns)
@@ -210,7 +215,10 @@ class LocalPortal:
 
 
 @asynccontextmanager
-async def open_portal(channel, nursery=None):
+async def open_portal(
+    channel: 'Channel',
+    nursery: trio._core._run.Nursery = None
+) -> typing.AsyncContextManager[Portal]:
     """Open a ``Portal`` through the provided ``channel``.
 
     Spawns a background task to handle message processing.
diff --git a/tractor/_trionics.py b/tractor/_trionics.py
index d78cbdd..310fea9 100644
--- a/tractor/_trionics.py
+++ b/tractor/_trionics.py
@@ -4,6 +4,7 @@
 import multiprocessing as mp
 import inspect
 from multiprocessing import forkserver, semaphore_tracker
+import typing
 
 import trio
 from async_generator import asynccontextmanager, aclosing
@@ -23,8 +24,8 @@ log = get_logger('tractor')
 class ActorNursery:
     """Spawn scoped subprocess actors.
     """
-    def __init__(self, actor, supervisor=None):
-        self.supervisor = supervisor  # TODO
+    def __init__(self, actor: Actor):
+        # self.supervisor = supervisor  # TODO
         self._actor = actor
         self._children = {}
         # portals spawned with ``run_in_actor()``
@@ -38,11 +39,11 @@ class ActorNursery:
     async def start_actor(
         self,
         name: str,
-        bind_addr=('127.0.0.1', 0),
-        statespace=None,
-        rpc_module_paths=None,
-        loglevel=None,  # set log level per subactor
-    ):
+        bind_addr: (str, int) = ('127.0.0.1', 0),
+        statespace: dict = None,
+        rpc_module_paths: [str] = None,
+        loglevel: str = None,  # set log level per subactor
+    ) -> Portal:
         loglevel = loglevel or self._actor.loglevel or get_loglevel()
         actor = Actor(
             name,
@@ -104,14 +105,14 @@ class ActorNursery:
 
     async def run_in_actor(
         self,
-        name,
-        fn,
-        bind_addr=('127.0.0.1', 0),
-        rpc_module_paths=None,
-        statespace=None,
-        loglevel=None,  # set log level per subactor
+        name: str,
+        fn: typing.Callable,
+        bind_addr: (str, int) = ('127.0.0.1', 0),
+        rpc_module_paths: [str] = None,
+        statespace: dict = None,
+        loglevel: str = None,  # set log level per subactor
         **kwargs,  # explicit args to ``fn``
-    ):
+    ) -> Portal:
         """Spawn a new actor, run a lone task, then terminate the actor and
         return its result.
 
@@ -134,7 +135,7 @@ class ActorNursery:
         )
         return portal
 
-    async def wait(self):
+    async def wait(self) -> None:
         """Wait for all subactors to complete.
         """
         async def maybe_consume_result(portal, actor):
@@ -193,7 +194,7 @@ class ActorNursery:
                     cs = await nursery.start(wait_for_actor, portal, subactor)
                 nursery.start_soon(wait_for_proc, proc, subactor, portal, cs)
 
-    async def cancel(self, hard_kill=False):
+    async def cancel(self, hard_kill: bool = False) -> None:
         """Cancel this nursery by instructing each subactor to cancel
         iteslf and wait for all subprocesses to terminate.
 
@@ -274,7 +275,7 @@ class ActorNursery:
 
 
 @asynccontextmanager
-async def open_nursery(supervisor=None):
+async def open_nursery() -> typing.AsyncContextManager[ActorNursery]:
     """Create and yield a new ``ActorNursery``.
     """
     actor = current_actor()
@@ -282,5 +283,5 @@ async def open_nursery(supervisor=None):
         raise RuntimeError("No actor instance has been defined yet?")
 
     # TODO: figure out supervisors from erlang
-    async with ActorNursery(current_actor(), supervisor) as nursery:
+    async with ActorNursery(current_actor()) as nursery:
         yield nursery
diff --git a/tractor/log.py b/tractor/log.py
index 3b013d1..d3e2a7f 100644
--- a/tractor/log.py
+++ b/tractor/log.py
@@ -92,5 +92,5 @@ def get_console_log(level: str = None, name: str = None) -> logging.Logger:
     return log
 
 
-def get_loglevel():
+def get_loglevel() -> str:
     return _default_loglevel