diff --git a/pylib/anki/collection.py b/pylib/anki/collection.py
index 9a057e23d..d227391f2 100644
--- a/pylib/anki/collection.py
+++ b/pylib/anki/collection.py
@@ -281,7 +281,7 @@ class Collection:
         self.db.rollback()
         self.db.begin()
 
-    def reopen(self, after_full_sync=False) -> None:
+    def reopen(self, after_full_sync: bool = False) -> None:
         assert not self.db
         assert self.path.endswith(".anki2")
 
@@ -410,7 +410,7 @@ class Collection:
     def cardCount(self) -> Any:
         return self.db.scalar("select count() from cards")
 
-    def remove_cards_and_orphaned_notes(self, card_ids: Sequence[int]):
+    def remove_cards_and_orphaned_notes(self, card_ids: Sequence[int]) -> None:
         "You probably want .remove_notes_by_card() instead."
         self._backend.remove_cards(card_ids=card_ids)
 
@@ -506,7 +506,7 @@ class Collection:
         dupes = []
         fields: Dict[int, int] = {}
 
-        def ordForMid(mid):
+        def ordForMid(mid: int) -> int:
             if mid not in fields:
                 model = self.models.get(mid)
                 for c, f in enumerate(model["flds"]):
@@ -540,7 +540,10 @@ class Collection:
     ##########################################################################
 
     def build_search_string(
-        self, *terms: Union[str, SearchTerm], negate=False, match_any=False
+        self,
+        *terms: Union[str, SearchTerm],
+        negate: bool = False,
+        match_any: bool = False,
     ) -> str:
         """Helper function for the backend's search string operations.
 
@@ -577,11 +580,11 @@ class Collection:
         except KeyError:
             return default
 
-    def set_config(self, key: str, val: Any):
+    def set_config(self, key: str, val: Any) -> None:
         self.setMod()
         self.conf.set(key, val)
 
-    def remove_config(self, key):
+    def remove_config(self, key: str) -> None:
         self.setMod()
         self.conf.remove(key)
 
@@ -780,11 +783,11 @@ table.review-log {{ {revlog_style} }}
     # Logging
     ##########################################################################
 
-    def log(self, *args, **kwargs) -> None:
+    def log(self, *args: Any, **kwargs: Any) -> None:
         if not self._should_log:
             return
 
-        def customRepr(x):
+        def customRepr(x: Any) -> str:
             if isinstance(x, str):
                 return x
             return pprint.pformat(x)
@@ -866,7 +869,7 @@ table.review-log {{ {revlog_style} }}
     def get_preferences(self) -> Preferences:
         return self._backend.get_preferences()
 
-    def set_preferences(self, prefs: Preferences):
+    def set_preferences(self, prefs: Preferences) -> None:
         self._backend.set_preferences(prefs)
 
 
diff --git a/pylib/anki/config.py b/pylib/anki/config.py
index 46bb1e1b7..e77e3e7a8 100644
--- a/pylib/anki/config.py
+++ b/pylib/anki/config.py
@@ -21,6 +21,7 @@ from __future__ import annotations
 import copy
 import weakref
 from typing import Any
+from weakref import ref
 
 import anki
 from anki.errors import NotFoundError
@@ -46,7 +47,7 @@ class ConfigManager:
     # Legacy dict interface
     #########################
 
-    def __getitem__(self, key):
+    def __getitem__(self, key: str) -> Any:
         val = self.get_immutable(key)
         if isinstance(val, list):
             print(
@@ -61,28 +62,28 @@ class ConfigManager:
         else:
             return val
 
-    def __setitem__(self, key, value):
+    def __setitem__(self, key: str, value: Any) -> None:
         self.set(key, value)
 
-    def get(self, key, default=None):
+    def get(self, key: str, default: Any = None) -> Any:
         try:
             return self[key]
         except KeyError:
             return default
 
-    def setdefault(self, key, default):
+    def setdefault(self, key: str, default: Any) -> Any:
         if key not in self:
             self[key] = default
         return self[key]
 
-    def __contains__(self, key):
+    def __contains__(self, key: str) -> bool:
         try:
             self.get_immutable(key)
             return True
         except KeyError:
             return False
 
-    def __delitem__(self, key):
+    def __delitem__(self, key: str) -> None:
         self.remove(key)
 
 
@@ -95,13 +96,13 @@ class ConfigManager:
 
 
 class WrappedList(list):
-    def __init__(self, conf, key, val):
+    def __init__(self, conf: ref[ConfigManager], key: str, val: Any) -> None:
         self.key = key
         self.conf = conf
         self.orig = copy.deepcopy(val)
         super().__init__(val)
 
-    def __del__(self):
+    def __del__(self) -> None:
         cur = list(self)
         conf = self.conf()
         if conf and self.orig != cur:
@@ -109,13 +110,13 @@ class WrappedList(list):
 
 
 class WrappedDict(dict):
-    def __init__(self, conf, key, val):
+    def __init__(self, conf: ref[ConfigManager], key: str, val: Any) -> None:
         self.key = key
         self.conf = conf
         self.orig = copy.deepcopy(val)
         super().__init__(val)
 
-    def __del__(self):
+    def __del__(self) -> None:
         cur = dict(self)
         conf = self.conf()
         if conf and self.orig != cur:
diff --git a/pylib/anki/decks.py b/pylib/anki/decks.py
index 9c0aec102..5242b23ab 100644
--- a/pylib/anki/decks.py
+++ b/pylib/anki/decks.py
@@ -5,6 +5,8 @@ from __future__ import annotations
 
 import copy
 import pprint
+import sys
+import traceback
 from typing import Any, Dict, Iterable, List, Optional, Sequence, Tuple, Union
 
 import anki  # pylint: disable=unused-import
@@ -43,36 +45,37 @@ class DecksDictProxy:
     def __init__(self, col: anki.collection.Collection):
         self._col = col.weakref()
 
-    def _warn(self):
+    def _warn(self) -> None:
+        traceback.print_stack(file=sys.stdout)
         print("add-on should use methods on col.decks, not col.decks.decks dict")
 
-    def __getitem__(self, item):
+    def __getitem__(self, item: Any) -> Any:
         self._warn()
         return self._col.decks.get(int(item))
 
-    def __setitem__(self, key, val):
+    def __setitem__(self, key: Any, val: Any) -> None:
         self._warn()
         self._col.decks.save(val)
 
-    def __len__(self):
+    def __len__(self) -> int:
         self._warn()
         return len(self._col.decks.all_names_and_ids())
 
-    def keys(self):
+    def keys(self) -> Any:
         self._warn()
         return [str(nt.id) for nt in self._col.decks.all_names_and_ids()]
 
-    def values(self):
+    def values(self) -> Any:
         self._warn()
         return self._col.decks.all()
 
-    def items(self):
+    def items(self) -> Any:
         self._warn()
         return [(str(nt["id"]), nt) for nt in self._col.decks.all()]
 
-    def __contains__(self, item):
+    def __contains__(self, item: Any) -> bool:
         self._warn()
-        self._col.decks.have(item)
+        return self._col.decks.have(item)
 
 
 class DeckManager:
@@ -97,7 +100,7 @@ class DeckManager:
             self.update(g, preserve_usn=False)
 
     # legacy
-    def flush(self):
+    def flush(self) -> None:
         pass
 
     def __repr__(self) -> str:
@@ -135,7 +138,7 @@ class DeckManager:
         self.col._backend.remove_deck(did)
 
     def all_names_and_ids(
-        self, skip_empty_default=False, include_filtered=True
+        self, skip_empty_default: bool = False, include_filtered: bool = True
     ) -> Sequence[DeckNameID]:
         "A sorted sequence of deck names and IDs."
         return self.col._backend.get_deck_names(
@@ -195,12 +198,12 @@ class DeckManager:
             )
         ]
 
-    def collapse(self, did) -> None:
+    def collapse(self, did: int) -> None:
         deck = self.get(did)
         deck["collapsed"] = not deck["collapsed"]
         self.save(deck)
 
-    def collapseBrowser(self, did) -> None:
+    def collapseBrowser(self, did: int) -> None:
         deck = self.get(did)
         collapsed = deck.get("browserCollapsed", False)
         deck["browserCollapsed"] = not collapsed
@@ -241,7 +244,7 @@ class DeckManager:
             return self.get_legacy(id)
         return None
 
-    def update(self, g: Deck, preserve_usn=True) -> None:
+    def update(self, g: Deck, preserve_usn: bool = True) -> None:
         "Add or update an existing deck. Used for syncing and merging."
         try:
             g["id"] = self.col._backend.add_or_update_deck_legacy(
@@ -303,7 +306,7 @@ class DeckManager:
         except NotFoundError:
             return None
 
-    def update_config(self, conf: DeckConfig, preserve_usn=False) -> None:
+    def update_config(self, conf: DeckConfig, preserve_usn: bool = False) -> None:
         conf["id"] = self.col._backend.add_or_update_deck_config_legacy(
             config=to_json_bytes(conf), preserve_usn_and_mtime=preserve_usn
         )
@@ -325,7 +328,7 @@ class DeckManager:
     ) -> int:
         return self.add_config(name, clone_from)["id"]
 
-    def remove_config(self, id) -> None:
+    def remove_config(self, id: int) -> None:
         "Remove a configuration and update all decks using it."
         self.col.modSchema(check=True)
         for g in self.all():
@@ -341,14 +344,14 @@ class DeckManager:
         grp["conf"] = id
         self.save(grp)
 
-    def didsForConf(self, conf) -> List[int]:
+    def didsForConf(self, conf: DeckConfig) -> List[int]:
         dids = []
         for deck in self.all():
             if "conf" in deck and deck["conf"] == conf["id"]:
                 dids.append(deck["id"])
         return dids
 
-    def restoreToDefault(self, conf) -> None:
+    def restoreToDefault(self, conf: DeckConfig) -> None:
         oldOrder = conf["new"]["order"]
         new = from_json_bytes(self.col._backend.new_deck_config_legacy())
         new["id"] = conf["id"]
@@ -380,7 +383,7 @@ class DeckManager:
             return deck["name"]
         return None
 
-    def setDeck(self, cids, did) -> None:
+    def setDeck(self, cids: List[int], did: int) -> None:
         self.col.db.execute(
             "update cards set did=?,usn=?,mod=? where id in " + ids2str(cids),
             did,
@@ -424,7 +427,7 @@ class DeckManager:
             self.col.conf["activeDecks"] = active
 
     # don't use this, it will likely go away
-    def update_active(self):
+    def update_active(self) -> None:
         self.select(self.current()["id"])
 
     # Parents/children
@@ -480,7 +483,7 @@ class DeckManager:
     # Change to Dict[int, "DeckManager.childMapNode"] when MyPy allow recursive type
 
     def childDids(self, did: int, childMap: DeckManager.childMapNode) -> List:
-        def gather(node: DeckManager.childMapNode, arr):
+        def gather(node: DeckManager.childMapNode, arr: List) -> None:
             for did, child in node.items():
                 arr.append(did)
                 gather(child, arr)
diff --git a/pylib/anki/find.py b/pylib/anki/find.py
index 553c9b35e..af829cb7d 100644
--- a/pylib/anki/find.py
+++ b/pylib/anki/find.py
@@ -16,10 +16,10 @@ class Finder:
         self.col = col.weakref()
         print("Finder() is deprecated, please use col.find_cards() or .find_notes()")
 
-    def findCards(self, query, order):
+    def findCards(self, query: Any, order: Any) -> Any:
         return self.col.find_cards(query, order)
 
-    def findNotes(self, query):
+    def findNotes(self, query: Any) -> Any:
         return self.col.find_notes(query)
 
 
@@ -55,7 +55,7 @@ def fieldNamesForNotes(col: Collection, nids: List[int]) -> List[str]:
 ##########################################################################
 
 
-def fieldNames(col, downcase=True) -> List:
+def fieldNames(col: Collection, downcase: bool = True) -> List:
     fields: Set[str] = set()
     for m in col.models.all():
         for f in m["flds"]:
diff --git a/pylib/anki/hooks.py b/pylib/anki/hooks.py
index 8a65d7bf2..87ca01ee8 100644
--- a/pylib/anki/hooks.py
+++ b/pylib/anki/hooks.py
@@ -25,7 +25,7 @@ from anki.hooks_gen import *
 _hooks: Dict[str, List[Callable[..., Any]]] = {}
 
 
-def runHook(hook: str, *args) -> None:
+def runHook(hook: str, *args: Any) -> None:
     "Run all functions on hook."
     hookFuncs = _hooks.get(hook, None)
     if hookFuncs:
@@ -37,7 +37,7 @@ def runHook(hook: str, *args) -> None:
                 raise
 
 
-def runFilter(hook: str, arg: Any, *args) -> Any:
+def runFilter(hook: str, arg: Any, *args: Any) -> Any:
     hookFuncs = _hooks.get(hook, None)
     if hookFuncs:
         for func in hookFuncs:
@@ -57,7 +57,7 @@ def addHook(hook: str, func: Callable) -> None:
         _hooks[hook].append(func)
 
 
-def remHook(hook, func) -> None:
+def remHook(hook: Any, func: Any) -> None:
     "Remove a function if is on hook."
     hook = _hooks.get(hook, [])
     if func in hook:
@@ -72,10 +72,10 @@ def remHook(hook, func) -> None:
 #
 # If you call wrap() with pos='around', the original function will not be called
 # automatically but can be called with _old().
-def wrap(old, new, pos="after") -> Callable:
+def wrap(old: Any, new: Any, pos: str = "after") -> Callable:
     "Override an existing function."
 
-    def repl(*args, **kwargs):
+    def repl(*args: Any, **kwargs: Any) -> Any:
         if pos == "after":
             old(*args, **kwargs)
             return new(*args, **kwargs)
@@ -85,7 +85,7 @@ def wrap(old, new, pos="after") -> Callable:
         else:
             return new(_old=old, *args, **kwargs)
 
-    def decorator_wrapper(f, *args, **kwargs):
+    def decorator_wrapper(f: Any, *args: Any, **kwargs: Any) -> Any:
         return repl(*args, **kwargs)
 
     return decorator.decorator(decorator_wrapper)(old)
diff --git a/pylib/anki/media.py b/pylib/anki/media.py
index 0b294d45c..c9b3b293e 100644
--- a/pylib/anki/media.py
+++ b/pylib/anki/media.py
@@ -11,7 +11,7 @@ import time
 import urllib.error
 import urllib.parse
 import urllib.request
-from typing import Any, Callable, List, Optional, Tuple
+from typing import Any, Callable, List, Match, Optional, Tuple
 
 import anki
 import anki._backend.backend_pb2 as _pb
@@ -197,7 +197,7 @@ class MediaManager:
         else:
             fn = urllib.parse.quote
 
-        def repl(match):
+        def repl(match: Match) -> str:
             tag = match.group(0)
             fname = match.group("fname")
             if re.match("(https?|ftp)://", fname):
diff --git a/pylib/anki/models.py b/pylib/anki/models.py
index e437171b3..363d12cc1 100644
--- a/pylib/anki/models.py
+++ b/pylib/anki/models.py
@@ -5,7 +5,9 @@ from __future__ import annotations
 
 import copy
 import pprint
+import sys
 import time
+import traceback
 from typing import Any, Dict, List, Optional, Sequence, Tuple, Union
 
 import anki  # pylint: disable=unused-import
@@ -39,36 +41,37 @@ class ModelsDictProxy:
     def __init__(self, col: anki.collection.Collection):
         self._col = col.weakref()
 
-    def _warn(self):
+    def _warn(self) -> None:
+        traceback.print_stack(file=sys.stdout)
         print("add-on should use methods on col.models, not col.models.models dict")
 
-    def __getitem__(self, item):
+    def __getitem__(self, item: Any) -> Any:
         self._warn()
         return self._col.models.get(int(item))
 
-    def __setitem__(self, key, val):
+    def __setitem__(self, key: str, val: Any) -> None:
         self._warn()
         self._col.models.save(val)
 
-    def __len__(self):
+    def __len__(self) -> int:
         self._warn()
         return len(self._col.models.all_names_and_ids())
 
-    def keys(self):
+    def keys(self) -> Any:
         self._warn()
         return [str(nt.id) for nt in self._col.models.all_names_and_ids()]
 
-    def values(self):
+    def values(self) -> Any:
         self._warn()
         return self._col.models.all()
 
-    def items(self):
+    def items(self) -> Any:
         self._warn()
         return [(str(nt["id"]), nt) for nt in self._col.models.all()]
 
-    def __contains__(self, item):
+    def __contains__(self, item: Any) -> bool:
         self._warn()
-        self._col.models.have(item)
+        return self._col.models.have(item)
 
 
 class ModelManager:
@@ -123,7 +126,7 @@ class ModelManager:
     def _get_cached(self, ntid: int) -> Optional[NoteType]:
         return self._cache.get(ntid)
 
-    def _clear_cache(self):
+    def _clear_cache(self) -> None:
         self._cache = {}
 
     # Listing note types
@@ -218,7 +221,7 @@ class ModelManager:
         "Delete model, and all its cards/notes."
         self.remove(m["id"])
 
-    def remove_all_notetypes(self):
+    def remove_all_notetypes(self) -> None:
         for nt in self.all_names_and_ids():
             self._remove_from_cache(nt.id)
             self.col._backend.remove_notetype(nt.id)
@@ -236,7 +239,7 @@ class ModelManager:
         if existing_id is not None and existing_id != m["id"]:
             m["name"] += "-" + checksum(str(time.time()))[:5]
 
-    def update(self, m: NoteType, preserve_usn=True) -> None:
+    def update(self, m: NoteType, preserve_usn: bool = True) -> None:
         "Add or update an existing model. Use .save() instead."
         self._remove_from_cache(m["id"])
         self.ensureNameUnique(m)
diff --git a/pylib/anki/notes.py b/pylib/anki/notes.py
index 4b33da9f8..456fd28bd 100644
--- a/pylib/anki/notes.py
+++ b/pylib/anki/notes.py
@@ -113,7 +113,7 @@ class Note:
     def __setitem__(self, key: str, value: str) -> None:
         self.fields[self._fieldOrd(key)] = value
 
-    def __contains__(self, key) -> bool:
+    def __contains__(self, key: str) -> bool:
         return key in self._fmap
 
     # Tags
diff --git a/pylib/anki/sched.py b/pylib/anki/sched.py
index 7c60fda30..ad4967a64 100644
--- a/pylib/anki/sched.py
+++ b/pylib/anki/sched.py
@@ -350,7 +350,7 @@ limit %d"""
         lastIvl = -(self._delayForGrade(conf, lastLeft))
         ivl = card.ivl if leaving else -(self._delayForGrade(conf, card.left))
 
-        def log():
+        def log() -> None:
             self.col.db.execute(
                 "insert into revlog values (?,?,?,?,?,?,?,?,?)",
                 int(time.time() * 1000),
@@ -450,7 +450,7 @@ and due <= ? limit ?)""",
         self._revQueue: List[Any] = []
         self._revDids = self.col.decks.active()[:]
 
-    def _fillRev(self, recursing=False) -> bool:
+    def _fillRev(self, recursing: bool = False) -> bool:
         "True if a review card can be fetched."
         if self._revQueue:
             return True
diff --git a/pylib/anki/schedv2.py b/pylib/anki/schedv2.py
index 682974a29..b470eb1dc 100644
--- a/pylib/anki/schedv2.py
+++ b/pylib/anki/schedv2.py
@@ -166,7 +166,7 @@ class Scheduler:
             self._restorePreviewCard(card)
             self._removeFromFiltered(card)
 
-    def _reset_counts(self):
+    def _reset_counts(self) -> None:
         tree = self.deck_due_tree(self.col.decks.selected())
         node = self.col.decks.find_deck_in_tree(tree, int(self.col.conf["curDeck"]))
         if not node:
@@ -187,7 +187,7 @@ class Scheduler:
         new, lrn, rev = counts
         return (new, lrn, rev)
 
-    def _is_finished(self):
+    def _is_finished(self) -> bool:
         "Don't use this, it is a stop-gap until this code is refactored."
         return not any((self.newCount, self.revCount, self._immediate_learn_count))
 
@@ -229,8 +229,12 @@ order by due"""
     ##########################################################################
 
     def update_stats(
-        self, deck_id: int, new_delta=0, review_delta=0, milliseconds_delta=0
-    ):
+        self,
+        deck_id: int,
+        new_delta: int = 0,
+        review_delta: int = 0,
+        milliseconds_delta: int = 0,
+    ) -> None:
         self.col._backend.update_stats(
             deck_id=deck_id,
             new_delta=new_delta,
@@ -321,7 +325,7 @@ order by due"""
         self._newQueue: List[int] = []
         self._updateNewCardRatio()
 
-    def _fillNew(self, recursing=False) -> bool:
+    def _fillNew(self, recursing: bool = False) -> bool:
         if self._newQueue:
             return True
         if not self.newCount:
@@ -841,7 +845,7 @@ and due <= ? limit ?)"""
     def _resetRev(self) -> None:
         self._revQueue: List[int] = []
 
-    def _fillRev(self, recursing=False) -> bool:
+    def _fillRev(self, recursing: bool = False) -> bool:
         "True if a review card can be fetched."
         if self._revQueue:
             return True
@@ -947,7 +951,7 @@ select id from cards where did in %s and queue = {QUEUE_TYPE_REV} and due <= ? l
         self._removeFromFiltered(card)
 
     def _logRev(self, card: Card, ease: int, delay: int, type: int) -> None:
-        def log():
+        def log() -> None:
             self.col.db.execute(
                 "insert into revlog values (?,?,?,?,?,?,?,?,?)",
                 int(time.time() * 1000),
@@ -1344,7 +1348,7 @@ due = (case when odue>0 then odue else due end), odue = 0, odid = 0, usn = ? whe
             mode = BuryOrSuspendMode.BURY_SCHED
         self.col._backend.bury_or_suspend_cards(card_ids=ids, mode=mode)
 
-    def bury_note(self, note: Note):
+    def bury_note(self, note: Note) -> None:
         self.bury_cards(note.card_ids())
 
     # legacy
@@ -1472,7 +1476,7 @@ and (queue={QUEUE_TYPE_NEW} or (queue={QUEUE_TYPE_REV} and due<=?))""",
     def orderCards(self, did: int) -> None:
         self.col._backend.sort_deck(deck_id=did, randomize=False)
 
-    def resortConf(self, conf) -> None:
+    def resortConf(self, conf: DeckConfig) -> None:
         for did in self.col.decks.didsForConf(conf):
             if conf["new"]["order"] == 0:
                 self.randomizeCards(did)
diff --git a/pylib/anki/stats.py b/pylib/anki/stats.py
index 24cdcc1b9..789d5e852 100644
--- a/pylib/anki/stats.py
+++ b/pylib/anki/stats.py
@@ -140,7 +140,7 @@ from revlog where id > ? """
         relrn = relrn or 0
         filt = filt or 0
         # studied
-        def bold(s):
+        def bold(s: str) -> str:
             return "<b>" + str(s) + "</b>"
 
         if cards:
@@ -298,7 +298,7 @@ group by day order by day"""
             # pylint: disable=invalid-unary-operand-type
             conf["xaxis"]["min"] = -days + 0.5
 
-        def plot(id, data, ylabel, ylabel2):
+        def plot(id: str, data: Any, ylabel: str, ylabel2: str) -> str:
             return self._graph(
                 id, data=data, conf=conf, xunit=chunk, ylabel=ylabel, ylabel2=ylabel2
             )
@@ -333,7 +333,7 @@ group by day order by day"""
             # pylint: disable=invalid-unary-operand-type
             conf["xaxis"]["min"] = -days + 0.5
 
-        def plot(id, data, ylabel, ylabel2):
+        def plot(id: str, data: Any, ylabel: str, ylabel2: str) -> str:
             return self._graph(
                 id, data=data, conf=conf, xunit=chunk, ylabel=ylabel, ylabel2=ylabel2
             )
diff --git a/pylib/anki/syncserver/__init__.py b/pylib/anki/syncserver/__init__.py
index 71ae39196..aff0a35e0 100644
--- a/pylib/anki/syncserver/__init__.py
+++ b/pylib/anki/syncserver/__init__.py
@@ -11,9 +11,10 @@ import os
 import socket
 import sys
 import time
+from http import HTTPStatus
 from io import BytesIO
 from tempfile import NamedTemporaryFile
-from typing import Optional
+from typing import Iterable, Optional
 
 try:
     import flask
@@ -89,7 +90,7 @@ def handle_sync_request(method_str: str) -> Response:
     elif method == Method.FULL_DOWNLOAD:
         path = outdata.decode("utf8")
 
-        def stream_reply():
+        def stream_reply() -> Iterable[bytes]:
             with open(path, "rb") as f:
                 while chunk := f.read(16 * 1024):
                     yield chunk
@@ -106,7 +107,7 @@ def handle_sync_request(method_str: str) -> Response:
     return resp
 
 
-def after_full_sync():
+def after_full_sync() -> None:
     # the server methods do not reopen the collection after a full sync,
     # so we need to
     col.reopen(after_full_sync=False)
@@ -146,15 +147,17 @@ def get_method(
 
 
 @app.route("/<path:pathin>", methods=["POST"])
-def handle_request(pathin: str):
+def handle_request(pathin: str) -> Response:
     path = pathin
     print(int(time.time()), flask.request.remote_addr, path)
 
     if path.startswith("sync/"):
         return handle_sync_request(path.split("/", maxsplit=1)[1])
+    else:
+        return flask.make_response("not found", HTTPStatus.NOT_FOUND)
 
 
-def folder():
+def folder() -> str:
     folder = os.getenv("FOLDER", os.path.expanduser("~/.syncserver"))
     if not os.path.exists(folder):
         print("creating", folder)
@@ -162,11 +165,11 @@ def folder():
     return folder
 
 
-def col_path():
+def col_path() -> str:
     return os.path.join(folder(), "collection.server.anki2")
 
 
-def serve():
+def serve() -> None:
     global col
 
     col = Collection(col_path(), server=True)
diff --git a/pylib/anki/tags.py b/pylib/anki/tags.py
index e64e9d434..67ae46c20 100644
--- a/pylib/anki/tags.py
+++ b/pylib/anki/tags.py
@@ -13,7 +13,7 @@ from __future__ import annotations
 
 import pprint
 import re
-from typing import Collection, List, Optional, Sequence, Tuple
+from typing import Collection, List, Match, Optional, Sequence, Tuple
 
 import anki  # pylint: disable=unused-import
 import anki._backend.backend_pb2 as _pb
@@ -139,7 +139,7 @@ class TagManager:
     def remFromStr(self, deltags: str, tags: str) -> str:
         "Delete tags if they exist."
 
-        def wildcard(pat: str, repl: str):
+        def wildcard(pat: str, repl: str) -> Match:
             pat = re.escape(pat).replace("\\*", ".*")
             return re.match("^" + pat + "$", repl, re.IGNORECASE)
 
diff --git a/pylib/mypy.ini b/pylib/mypy.ini
index 7324ddfbc..074377dad 100644
--- a/pylib/mypy.ini
+++ b/pylib/mypy.ini
@@ -9,6 +9,14 @@ warn_redundant_casts = True
 warn_unused_configs = True
 strict_equality = true
 
+[mypy-anki.*]
+disallow_untyped_defs = True
+[mypy-anki.importing.*]
+disallow_untyped_defs = False
+[mypy-anki.exporting]
+disallow_untyped_defs = False
+
+
 [mypy-win32file]
 ignore_missing_imports = True
 [mypy-win32pipe]