diff --git a/src/python/jw/pkg/App.py b/src/python/jw/pkg/App.py
index f161253d..f46e8bc1 100644
--- a/src/python/jw/pkg/App.py
+++ b/src/python/jw/pkg/App.py
@@ -10,7 +10,7 @@ import sys
 
 from enum import Enum, auto
 from functools import cache
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from .lib.App import App as Base
 from .lib.Distro import Distro
@@ -374,11 +374,13 @@ class App(Base):
                 default_pkg_filter = pkg_filter,
             )
 
+    @override
     async def __aexit__(self, exc_type, exc, tb) -> None:
         if self.__exec_context is not None:
             await self.__exec_context.close()
             self.__exec_context = None
 
+    @override
     def _add_arguments(self, parser) -> None:
         super()._add_arguments(parser)
         parser.add_argument('-t', '--topdir', default = None, help = 'Project Path')
@@ -421,6 +423,7 @@ class App(Base):
             help = 'Default filter for all distribution package-related operations',
         )
 
+    @override
     async def _run(self, args: argparse.Namespace) -> None:
         self.___topdir = args.topdir
         self.___pretty_topdir = self.__format_topdir(self.___topdir, args.topdir_format)
diff --git a/src/python/jw/pkg/CmdBase.py b/src/python/jw/pkg/CmdBase.py
index 65a517b5..17f16759 100644
--- a/src/python/jw/pkg/CmdBase.py
+++ b/src/python/jw/pkg/CmdBase.py
@@ -1,8 +1,10 @@
+from typing import override
 from .App import App
 from .lib.Cmd import Cmd as Base
 
 class CmdBase(Base):
 
+    @override  # pyright: ignore[reportArgumentType]
     @property
     def app(self) -> App:
         ret = super().app
diff --git a/src/python/jw/pkg/cmds/Cmd.py b/src/python/jw/pkg/cmds/Cmd.py
index 7fbb7e21..5f9509cd 100644
--- a/src/python/jw/pkg/cmds/Cmd.py
+++ b/src/python/jw/pkg/cmds/Cmd.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ..App import App as Parent
 from ..CmdBase import CmdBase as Base
@@ -20,6 +20,7 @@ class Cmd(Base):  # export
     ) -> None:
         super().__init__(parent, name, help, aliases = aliases)
 
+    @override
     async def _run(self, args):
         # Missing subcommand
         self.print_help(1)
diff --git a/src/python/jw/pkg/cmds/CmdPkg.py b/src/python/jw/pkg/cmds/CmdPkg.py
index 124e7b65..48bd21ac 100644
--- a/src/python/jw/pkg/cmds/CmdPkg.py
+++ b/src/python/jw/pkg/cmds/CmdPkg.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -18,6 +18,7 @@ class CmdPkg(Cmd):  # export
         )
         self.load_subcommands()
 
+    @override
     async def _run(self, args):
         import sys
 
@@ -25,5 +26,6 @@ class CmdPkg(Cmd):  # export
         self.parser.print_help()
         sys.exit(1)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
diff --git a/src/python/jw/pkg/cmds/CmdPlatform.py b/src/python/jw/pkg/cmds/CmdPlatform.py
index 05c84473..130b2b5b 100644
--- a/src/python/jw/pkg/cmds/CmdPlatform.py
+++ b/src/python/jw/pkg/cmds/CmdPlatform.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -15,6 +15,7 @@ class CmdPlatform(Cmd):  # export
         )
         self.load_subcommands()
 
+    @override
     async def _run(self, args):
         import sys
 
@@ -22,5 +23,6 @@ class CmdPlatform(Cmd):  # export
         self.parser.print_help()
         sys.exit(1)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
diff --git a/src/python/jw/pkg/cmds/CmdPosix.py b/src/python/jw/pkg/cmds/CmdPosix.py
index 72bcece6..3e3a3747 100644
--- a/src/python/jw/pkg/cmds/CmdPosix.py
+++ b/src/python/jw/pkg/cmds/CmdPosix.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -20,6 +20,7 @@ class CmdPosix(Cmd):  # export
         )
         self.load_subcommands()
 
+    @override
     async def _run(self, args):
         import sys
 
@@ -27,5 +28,6 @@ class CmdPosix(Cmd):  # export
         self.parser.print_help()
         sys.exit(1)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
diff --git a/src/python/jw/pkg/cmds/CmdProjects.py b/src/python/jw/pkg/cmds/CmdProjects.py
index 99d47815..2bde3392 100644
--- a/src/python/jw/pkg/cmds/CmdProjects.py
+++ b/src/python/jw/pkg/cmds/CmdProjects.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -17,6 +17,7 @@ class CmdProjects(Cmd):  # export
         )
         self.load_subcommands()
 
+    @override
     async def _run(self, args):
         import sys
 
@@ -24,5 +25,6 @@ class CmdProjects(Cmd):  # export
         self.parser.print_help()
         sys.exit(1)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
diff --git a/src/python/jw/pkg/cmds/CmdSecrets.py b/src/python/jw/pkg/cmds/CmdSecrets.py
index cd5eaec9..3b28ed0a 100644
--- a/src/python/jw/pkg/cmds/CmdSecrets.py
+++ b/src/python/jw/pkg/cmds/CmdSecrets.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -13,6 +13,7 @@ class CmdSecrets(Cmd):  # export
         super().__init__(parent, 'secrets', help = 'Manage package secrets')
         self.load_subcommands()
 
+    @override
     async def _run(self, args):
         import sys
 
@@ -20,5 +21,6 @@ class CmdSecrets(Cmd):  # export
         self.parser.print_help()
         sys.exit(1)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
diff --git a/src/python/jw/pkg/cmds/pkg/CmdDelete.py b/src/python/jw/pkg/cmds/pkg/CmdDelete.py
index 8a75fafc..5a1c68b3 100644
--- a/src/python/jw/pkg/cmds/pkg/CmdDelete.py
+++ b/src/python/jw/pkg/cmds/pkg/CmdDelete.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -12,11 +12,13 @@ class CmdDelete(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'delete', help = 'Delete packages by name')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
             'names', nargs = '*', help = 'Names of packages to be deleted'
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         return await self.distro.delete(args.names)
diff --git a/src/python/jw/pkg/cmds/pkg/CmdDup.py b/src/python/jw/pkg/cmds/pkg/CmdDup.py
index 378a8804..9ac53e64 100644
--- a/src/python/jw/pkg/cmds/pkg/CmdDup.py
+++ b/src/python/jw/pkg/cmds/pkg/CmdDup.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -12,6 +12,7 @@ class CmdDup(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'dup', help = 'Upgrade distribution')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -21,5 +22,6 @@ class CmdDup(Cmd):  # export
             help = "Only download packages from the repos, don't install them, yet",
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         return await self.distro.dup(download_only = args.download_only)
diff --git a/src/python/jw/pkg/cmds/pkg/CmdInstall.py b/src/python/jw/pkg/cmds/pkg/CmdInstall.py
index dbeaebcf..22e75800 100644
--- a/src/python/jw/pkg/cmds/pkg/CmdInstall.py
+++ b/src/python/jw/pkg/cmds/pkg/CmdInstall.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from .Cmd import Cmd, Parent
 
@@ -16,6 +16,7 @@ class CmdInstall(Cmd):  # export
             help = "Install the distribution's notion of available packages",
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('names', nargs = '*', help = 'Packages to be installed')
@@ -32,6 +33,7 @@ class CmdInstall(Cmd):  # export
             help = "Don't expand macros in <names>",
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         names = (
             args.names if args.fixed_strings else self.distro.expand_macros(args.names)
diff --git a/src/python/jw/pkg/cmds/pkg/CmdLs.py b/src/python/jw/pkg/cmds/pkg/CmdLs.py
index ccbd1bf3..b3a74d6f 100644
--- a/src/python/jw/pkg/cmds/pkg/CmdLs.py
+++ b/src/python/jw/pkg/cmds/pkg/CmdLs.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .NamedPkgsCmd import NamedPkgsCmd
 
@@ -14,9 +14,11 @@ class CmdLs(NamedPkgsCmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'ls', help = 'List package contents')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
 
+    @override
     async def _run(self, args: Namespace) -> None:
         for name in args.names:
             print('\n'.join(await self.distro.pkg_files(name)))
diff --git a/src/python/jw/pkg/cmds/pkg/CmdMeta.py b/src/python/jw/pkg/cmds/pkg/CmdMeta.py
index aa70f644..7e29a9c3 100644
--- a/src/python/jw/pkg/cmds/pkg/CmdMeta.py
+++ b/src/python/jw/pkg/cmds/pkg/CmdMeta.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .NamedPkgsCmd import NamedPkgsCmd, Parent
 
@@ -12,9 +12,11 @@ class CmdMeta(NamedPkgsCmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'meta', help = 'List package metadata')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
 
+    @override
     async def _run(self, args: Namespace) -> None:
         names = await self.distro.select(args.names)
         for name in names:
diff --git a/src/python/jw/pkg/cmds/pkg/CmdRebootRequired.py b/src/python/jw/pkg/cmds/pkg/CmdRebootRequired.py
index 13097ea8..24f94c7b 100644
--- a/src/python/jw/pkg/cmds/pkg/CmdRebootRequired.py
+++ b/src/python/jw/pkg/cmds/pkg/CmdRebootRequired.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -16,8 +16,10 @@ class CmdRebootRequired(Cmd):  # export
             help = 'Check whether the machine needs rebooting'
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
 
+    @override
     async def _run(self, args: Namespace) -> None:
         await self.distro.reboot_required()
diff --git a/src/python/jw/pkg/cmds/pkg/CmdRefresh.py b/src/python/jw/pkg/cmds/pkg/CmdRefresh.py
index 32a79284..5b997bcc 100644
--- a/src/python/jw/pkg/cmds/pkg/CmdRefresh.py
+++ b/src/python/jw/pkg/cmds/pkg/CmdRefresh.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -16,8 +16,10 @@ class CmdRefresh(Cmd):  # export
             help = "Refresh the distribution's notion of available packages",
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
 
+    @override
     async def _run(self, args: Namespace) -> None:
         return await self.distro.ref()
diff --git a/src/python/jw/pkg/cmds/pkg/CmdSelect.py b/src/python/jw/pkg/cmds/pkg/CmdSelect.py
index 3a51e13a..0432f0cd 100644
--- a/src/python/jw/pkg/cmds/pkg/CmdSelect.py
+++ b/src/python/jw/pkg/cmds/pkg/CmdSelect.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from ...lib.PackageFilter import PackageFilterString
 from .Cmd import Cmd, Parent
@@ -13,10 +13,12 @@ class CmdSelect(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'select', help = 'Select packages by filter')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('filter', help = 'Package filter string')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         filter = PackageFilterString(args.filter) if args.filter else None
         for p in await self.distro.select(filter = filter):
diff --git a/src/python/jw/pkg/cmds/pkg/NamedPkgsCmd.py b/src/python/jw/pkg/cmds/pkg/NamedPkgsCmd.py
index ba0c8217..4fee5377 100644
--- a/src/python/jw/pkg/cmds/pkg/NamedPkgsCmd.py
+++ b/src/python/jw/pkg/cmds/pkg/NamedPkgsCmd.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -12,6 +12,7 @@ class NamedPkgsCmd(Cmd):  # export
     def __init__(self, parent: Parent, name: str, help: str) -> None:
         super().__init__(parent, name, help)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('names', nargs = '*', help = 'Package names')
diff --git a/src/python/jw/pkg/cmds/platform/CmdInfo.py b/src/python/jw/pkg/cmds/platform/CmdInfo.py
index ddacfd56..3b7814ee 100644
--- a/src/python/jw/pkg/cmds/platform/CmdInfo.py
+++ b/src/python/jw/pkg/cmds/platform/CmdInfo.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from ...lib.Distro import Distro
 from .Cmd import Cmd, Parent
@@ -15,6 +15,7 @@ class CmdInfo(Cmd):  # export
             parent, 'info', help = 'Retrieve information about target platform'
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -23,5 +24,6 @@ class CmdInfo(Cmd):  # export
             help = f'Format string, expanding macros {", ".join(Distro.macros())}',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         print(self.app.distro.expand_macros(args.format))
diff --git a/src/python/jw/pkg/cmds/posix/Cmd.py b/src/python/jw/pkg/cmds/posix/Cmd.py
index d43b29f1..3093618b 100644
--- a/src/python/jw/pkg/cmds/posix/Cmd.py
+++ b/src/python/jw/pkg/cmds/posix/Cmd.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ...CmdBase import CmdBase as Base
 from ..CmdPosix import CmdPosix as Parent
@@ -13,6 +13,7 @@ class Cmd(Base):  # export
     def __init__(self, parent: Parent, name: str, help: str) -> None:
         super().__init__(parent, name, help)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
 
diff --git a/src/python/jw/pkg/cmds/posix/CmdCopy.py b/src/python/jw/pkg/cmds/posix/CmdCopy.py
index e38c15bd..2dc600ec 100644
--- a/src/python/jw/pkg/cmds/posix/CmdCopy.py
+++ b/src/python/jw/pkg/cmds/posix/CmdCopy.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from ...lib.util import copy
 from .Cmd import Cmd, Parent
@@ -13,6 +13,7 @@ class CmdCopy(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'copy', help = 'Copy files')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('src', help = 'Source file URI')
@@ -33,6 +34,7 @@ class CmdCopy(Cmd):  # export
             help = "Don't expand macros in <src> and <dst>",
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
 
         def __expand(url: str) -> str:
diff --git a/src/python/jw/pkg/cmds/posix/CmdTar.py b/src/python/jw/pkg/cmds/posix/CmdTar.py
index 0db6d835..80355a24 100644
--- a/src/python/jw/pkg/cmds/posix/CmdTar.py
+++ b/src/python/jw/pkg/cmds/posix/CmdTar.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -13,6 +13,7 @@ class CmdTar(Cmd):  # export
         super().__init__(parent, 'tar', help = 'Handle tar archives')
         self.load_subcommands()
 
+    @override
     async def _run(self, args):
         import sys
 
@@ -20,5 +21,6 @@ class CmdTar(Cmd):  # export
         self.parser.print_help()
         sys.exit(1)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
diff --git a/src/python/jw/pkg/cmds/posix/tar/Cmd.py b/src/python/jw/pkg/cmds/posix/tar/Cmd.py
index c08cacee..f3bf5e5d 100644
--- a/src/python/jw/pkg/cmds/posix/tar/Cmd.py
+++ b/src/python/jw/pkg/cmds/posix/tar/Cmd.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from contextlib import asynccontextmanager
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ....CmdBase import CmdBase as Base
 from ....lib.FileContext import FileContext
@@ -27,6 +27,7 @@ class Cmd(Base):  # export
             )
             yield ret
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
diff --git a/src/python/jw/pkg/cmds/posix/tar/CmdExtract.py b/src/python/jw/pkg/cmds/posix/tar/CmdExtract.py
index c9b2f191..ace743f9 100644
--- a/src/python/jw/pkg/cmds/posix/tar/CmdExtract.py
+++ b/src/python/jw/pkg/cmds/posix/tar/CmdExtract.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from ....lib.log import DEBUG, log
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -12,10 +12,12 @@ class CmdExtract(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'x', help = 'Extract a tar archive')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('dst', help = 'Destination root URI')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         async with self.ctx(dst = args.dst) as ctx:
             paths = await ctx.extract(ctx.dst.root)
diff --git a/src/python/jw/pkg/cmds/projects/BaseCmdPkgRelations.py b/src/python/jw/pkg/cmds/projects/BaseCmdPkgRelations.py
index 42dc977e..8d5c9cb2 100644
--- a/src/python/jw/pkg/cmds/projects/BaseCmdPkgRelations.py
+++ b/src/python/jw/pkg/cmds/projects/BaseCmdPkgRelations.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import re
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 from .lib.pkg_relations import VersionSyntax
@@ -48,6 +48,7 @@ class BaseCmdPkgRelations(Cmd):
         super().__init__(parent, 'pkg-' + relation, help = help)
         self.relation = relation
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -141,6 +142,7 @@ class BaseCmdPkgRelations(Cmd):
             help = 'Put double quotes around each listed dependency',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         return self.print_pkg_relations(self.relation, args)
 
diff --git a/src/python/jw/pkg/cmds/projects/Cmd.py b/src/python/jw/pkg/cmds/projects/Cmd.py
index 299733a7..97533bca 100644
--- a/src/python/jw/pkg/cmds/projects/Cmd.py
+++ b/src/python/jw/pkg/cmds/projects/Cmd.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ...CmdBase import CmdBase as Base
 from ..CmdProjects import CmdProjects as Parent
@@ -13,6 +13,7 @@ class Cmd(Base):  # export
     def __init__(self, parent: Parent, name: str, help: str) -> None:
         super().__init__(parent, name, help)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
 
diff --git a/src/python/jw/pkg/cmds/projects/CmdBuild.py b/src/python/jw/pkg/cmds/projects/CmdBuild.py
index 9f2f3f43..3972bda5 100644
--- a/src/python/jw/pkg/cmds/projects/CmdBuild.py
+++ b/src/python/jw/pkg/cmds/projects/CmdBuild.py
@@ -5,7 +5,7 @@ import os
 import re
 
 from functools import lru_cache
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from ...App import Scope
 from ...lib.log import DEBUG, ERR, NOTICE, log
@@ -22,6 +22,7 @@ class CmdBuild(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'build', help = 'janware software project build tool')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -90,6 +91,7 @@ class CmdBuild(Cmd):  # export
             help = 'Modules to be built',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
 
         @lru_cache(maxsize = None)
diff --git a/src/python/jw/pkg/cmds/projects/CmdCanonicalizeRemotes.py b/src/python/jw/pkg/cmds/projects/CmdCanonicalizeRemotes.py
index a852cf67..f167cfa7 100644
--- a/src/python/jw/pkg/cmds/projects/CmdCanonicalizeRemotes.py
+++ b/src/python/jw/pkg/cmds/projects/CmdCanonicalizeRemotes.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from ...lib.base import InputMode
 from ...lib.log import NOTICE, log
@@ -20,6 +20,7 @@ class CmdCanonicalizeRemotes(Cmd):  # export
             parent, 'canonicalize-remotes', help = 'Streamline janware Git remotes'
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -30,6 +31,7 @@ class CmdCanonicalizeRemotes(Cmd):  # export
             help = 'Only log what would be done',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
 
         async def git(cmd: list[str], ro = False, throw = True) -> Result:
diff --git a/src/python/jw/pkg/cmds/projects/CmdCflags.py b/src/python/jw/pkg/cmds/projects/CmdCflags.py
index 23553fd8..15c39a04 100644
--- a/src/python/jw/pkg/cmds/projects/CmdCflags.py
+++ b/src/python/jw/pkg/cmds/projects/CmdCflags.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from ...App import Scope
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -12,10 +12,12 @@ class CmdCflags(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'cflags', help = 'cflags')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         deps = self.app.get_project_refs(
             args.module,
diff --git a/src/python/jw/pkg/cmds/projects/CmdCheck.py b/src/python/jw/pkg/cmds/projects/CmdCheck.py
index e33f3ac9..84198475 100644
--- a/src/python/jw/pkg/cmds/projects/CmdCheck.py
+++ b/src/python/jw/pkg/cmds/projects/CmdCheck.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser
@@ -16,6 +16,7 @@ class CmdCheck(Cmd):  # export
         )
         self.load_subcommands()
 
+    @override
     async def _run(self, args):
         import sys
 
@@ -23,5 +24,6 @@ class CmdCheck(Cmd):  # export
         self.parser.print_help()
         sys.exit(1)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
diff --git a/src/python/jw/pkg/cmds/projects/CmdCommands.py b/src/python/jw/pkg/cmds/projects/CmdCommands.py
index 8fb580e3..c22101ef 100644
--- a/src/python/jw/pkg/cmds/projects/CmdCommands.py
+++ b/src/python/jw/pkg/cmds/projects/CmdCommands.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -11,9 +11,11 @@ class CmdCommands(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'commands', help = 'List available commands')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
 
+    @override
     async def _run(self, args: Namespace) -> None:
         import glob
         import os
diff --git a/src/python/jw/pkg/cmds/projects/CmdCreateFile.py b/src/python/jw/pkg/cmds/projects/CmdCreateFile.py
index e57c37e2..03e455d6 100644
--- a/src/python/jw/pkg/cmds/projects/CmdCreateFile.py
+++ b/src/python/jw/pkg/cmds/projects/CmdCreateFile.py
@@ -1,5 +1,6 @@
 from argparse import ArgumentParser, ArgumentTypeError, Namespace
 from enum import Enum, auto
+from typing import override
 
 from ...lib.log import WARNING, log
 from .Cmd import Cmd, Parent
@@ -93,6 +94,7 @@ class CmdCreateFile(Cmd):  # export
             parent, 'create-file', help = 'Generate a file from project metadata'
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -124,6 +126,7 @@ class CmdCreateFile(Cmd):  # export
         )
         parser.add_argument('module', help = 'The module to generate the file for')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         method = getattr(self, 'render_' + args.format, None)
         if method is None:  # Should be prevented by choices=[] but keeps linter happy
diff --git a/src/python/jw/pkg/cmds/projects/CmdCreatePkgConfig.py b/src/python/jw/pkg/cmds/projects/CmdCreatePkgConfig.py
index 30f075c6..f5dab4a5 100644
--- a/src/python/jw/pkg/cmds/projects/CmdCreatePkgConfig.py
+++ b/src/python/jw/pkg/cmds/projects/CmdCreatePkgConfig.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 from .lib.templates import tmpl_render
@@ -32,6 +32,7 @@ class CmdCreatePkgConfig(Cmd):  # export
             string = re.sub(patt, replacement, string)
         return string
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('-F', '--project-descr-file', default = None)
@@ -46,6 +47,7 @@ class CmdCreatePkgConfig(Cmd):  # export
         parser.add_argument('-R', '--requires-build', default = None)
         parser.add_argument('-V', '--variables', nargs = '*')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         project_conf_var_keys = [
             'description',
diff --git a/src/python/jw/pkg/cmds/projects/CmdExepath.py b/src/python/jw/pkg/cmds/projects/CmdExepath.py
index fe03106f..ba2e6ea1 100644
--- a/src/python/jw/pkg/cmds/projects/CmdExepath.py
+++ b/src/python/jw/pkg/cmds/projects/CmdExepath.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from ...App import Scope
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -12,6 +12,7 @@ class CmdExepath(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'exepath', help = 'exepath')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -23,6 +24,7 @@ class CmdExepath(Cmd):  # export
         )
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         deps = self.app.get_project_refs(
             args.module,
diff --git a/src/python/jw/pkg/cmds/projects/CmdGetAuthInfo.py b/src/python/jw/pkg/cmds/projects/CmdGetAuthInfo.py
index 1f4a2d79..5571998f 100644
--- a/src/python/jw/pkg/cmds/projects/CmdGetAuthInfo.py
+++ b/src/python/jw/pkg/cmds/projects/CmdGetAuthInfo.py
@@ -5,7 +5,7 @@ import re
 from ...lib.log import DEBUG, log
 from ...lib.Uri import Uri
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -19,6 +19,7 @@ class CmdGetAuthInfo(Cmd):  # export
             help = 'Try to retrieve authentication information from the source tree',
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -52,6 +53,7 @@ class CmdGetAuthInfo(Cmd):  # export
             help = 'Show remote base URL',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         keys = ['username', 'password']
 
diff --git a/src/python/jw/pkg/cmds/projects/CmdGetval.py b/src/python/jw/pkg/cmds/projects/CmdGetval.py
index a8ddd5c3..54bfefba 100644
--- a/src/python/jw/pkg/cmds/projects/CmdGetval.py
+++ b/src/python/jw/pkg/cmds/projects/CmdGetval.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -11,6 +11,7 @@ class CmdGetval(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'getval', help = 'Get value from project config')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -21,6 +22,7 @@ class CmdGetval(Cmd):  # export
         parser.add_argument('section', default = '', help = 'Config section')
         parser.add_argument('key', default = '', help = 'Config key')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         project = args.project
         if project is None:
diff --git a/src/python/jw/pkg/cmds/projects/CmdHtdocsDir.py b/src/python/jw/pkg/cmds/projects/CmdHtdocsDir.py
index 65fbc2bf..0322d93c 100644
--- a/src/python/jw/pkg/cmds/projects/CmdHtdocsDir.py
+++ b/src/python/jw/pkg/cmds/projects/CmdHtdocsDir.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -15,10 +15,12 @@ class CmdHtdocsDir(Cmd):  # export
             help = 'Print source directory containing document root of a given module',
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         r = []
         for m in args.module:
diff --git a/src/python/jw/pkg/cmds/projects/CmdLdflags.py b/src/python/jw/pkg/cmds/projects/CmdLdflags.py
index 66f7f713..cf626801 100644
--- a/src/python/jw/pkg/cmds/projects/CmdLdflags.py
+++ b/src/python/jw/pkg/cmds/projects/CmdLdflags.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from ...App import Scope
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -12,6 +12,7 @@ class CmdLdflags(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'ldflags', help = 'ldflags')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
@@ -56,6 +57,7 @@ class CmdLdflags(Cmd):  # export
             return None
         return ' '.join(ret)
 
+    @override
     async def _run(self, args: Namespace) -> None:
         deps = self.app.get_project_refs(
             args.module,
diff --git a/src/python/jw/pkg/cmds/projects/CmdLdlibpath.py b/src/python/jw/pkg/cmds/projects/CmdLdlibpath.py
index a72925df..01aa9785 100644
--- a/src/python/jw/pkg/cmds/projects/CmdLdlibpath.py
+++ b/src/python/jw/pkg/cmds/projects/CmdLdlibpath.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from ...App import Scope
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -12,6 +12,7 @@ class CmdLdlibpath(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'ldlibpath', help = 'ldlibpath')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -23,6 +24,7 @@ class CmdLdlibpath(Cmd):  # export
         )
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         deps = self.app.get_project_refs(
             args.module,
diff --git a/src/python/jw/pkg/cmds/projects/CmdLibname.py b/src/python/jw/pkg/cmds/projects/CmdLibname.py
index 7ec2f1cb..68167261 100644
--- a/src/python/jw/pkg/cmds/projects/CmdLibname.py
+++ b/src/python/jw/pkg/cmds/projects/CmdLibname.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -11,9 +11,11 @@ class CmdLibname(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'libname', help = 'libname')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         print(self.app.get_libname(args.module))
diff --git a/src/python/jw/pkg/cmds/projects/CmdListRepos.py b/src/python/jw/pkg/cmds/projects/CmdListRepos.py
index ea84c8e4..afcce40d 100644
--- a/src/python/jw/pkg/cmds/projects/CmdListRepos.py
+++ b/src/python/jw/pkg/cmds/projects/CmdListRepos.py
@@ -6,7 +6,7 @@ from ...lib.log import DEBUG, log
 from ...lib.Uri import Uri
 from ...lib.util import get_password, get_username, run_curl_into
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -18,6 +18,7 @@ class CmdListRepos(Cmd):  # export
             parent, 'list-repos', help = 'Query a remote GIT server for repositories'
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -43,6 +44,7 @@ class CmdListRepos(Cmd):  # export
             '--from-owner', help = "List from-owner's projects", default = 'janware'
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
 
         base_url = Uri(args.base_url)
diff --git a/src/python/jw/pkg/cmds/projects/CmdModules.py b/src/python/jw/pkg/cmds/projects/CmdModules.py
index 01b6b761..835c0b95 100644
--- a/src/python/jw/pkg/cmds/projects/CmdModules.py
+++ b/src/python/jw/pkg/cmds/projects/CmdModules.py
@@ -3,7 +3,7 @@ import re
 
 from ...lib.log import DEBUG, log
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -13,6 +13,7 @@ class CmdModules(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'modules', help = 'Query existing janware packages')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -24,6 +25,7 @@ class CmdModules(Cmd):  # export
             'Key-value pairs, seperated by commas, to be searched for in project.conf',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         import pathlib
 
diff --git a/src/python/jw/pkg/cmds/projects/CmdPath.py b/src/python/jw/pkg/cmds/projects/CmdPath.py
index 658d0010..9f1d5bea 100644
--- a/src/python/jw/pkg/cmds/projects/CmdPath.py
+++ b/src/python/jw/pkg/cmds/projects/CmdPath.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from ...App import Scope
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -12,10 +12,12 @@ class CmdPath(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'path', help = 'path')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         deps = self.app.get_project_refs(
             args.module,
diff --git a/src/python/jw/pkg/cmds/projects/CmdProjDir.py b/src/python/jw/pkg/cmds/projects/CmdProjDir.py
index 5d6068fe..a3c39504 100644
--- a/src/python/jw/pkg/cmds/projects/CmdProjDir.py
+++ b/src/python/jw/pkg/cmds/projects/CmdProjDir.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from ...lib.log import WARNING, log
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -14,10 +14,12 @@ class CmdProjDir(Cmd):  # export
             parent, 'proj-dir', help = 'Print directory of a given package'
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         out = []
         for m in args.module:
diff --git a/src/python/jw/pkg/cmds/projects/CmdPythonpath.py b/src/python/jw/pkg/cmds/projects/CmdPythonpath.py
index b7012c05..054bf607 100644
--- a/src/python/jw/pkg/cmds/projects/CmdPythonpath.py
+++ b/src/python/jw/pkg/cmds/projects/CmdPythonpath.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from ...App import Scope
 from .Cmd import Cmd, Parent
@@ -15,6 +15,7 @@ class CmdPythonpath(Cmd):  # export
             parent, 'pythonpath', help = 'Generate PYTHONPATH for given modules'
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -38,6 +39,7 @@ class CmdPythonpath(Cmd):  # export
         )
         parser.add_argument('module', help = 'Modules', nargs = '*')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         deps = self.app.get_project_refs(
             args.module,
diff --git a/src/python/jw/pkg/cmds/projects/CmdRequiredOsPkg.py b/src/python/jw/pkg/cmds/projects/CmdRequiredOsPkg.py
index af472492..17fe5e32 100644
--- a/src/python/jw/pkg/cmds/projects/CmdRequiredOsPkg.py
+++ b/src/python/jw/pkg/cmds/projects/CmdRequiredOsPkg.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 from ...App import Scope
 from ...lib.log import DEBUG, log
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -18,6 +18,7 @@ class CmdRequiredOsPkg(Cmd):  # export
             help = 'List distribution packages required for a package',
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('flavours', help = 'Dependency flavours', default = 'build')
@@ -35,6 +36,7 @@ class CmdRequiredOsPkg(Cmd):  # export
             help = 'Put double quotes around each listed dependency',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         modules = args.modules
         flavours = set(args.flavours.split(','))
diff --git a/src/python/jw/pkg/cmds/projects/CmdSummary.py b/src/python/jw/pkg/cmds/projects/CmdSummary.py
index dc76edcf..0607bee0 100644
--- a/src/python/jw/pkg/cmds/projects/CmdSummary.py
+++ b/src/python/jw/pkg/cmds/projects/CmdSummary.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -13,10 +13,12 @@ class CmdSummary(Cmd):  # export
             parent, 'summary', help = 'Print summary description of given modules'
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         r = []
         for m in args.module:
diff --git a/src/python/jw/pkg/cmds/projects/CmdTest.py b/src/python/jw/pkg/cmds/projects/CmdTest.py
index 31ccaff1..d81c0c7b 100644
--- a/src/python/jw/pkg/cmds/projects/CmdTest.py
+++ b/src/python/jw/pkg/cmds/projects/CmdTest.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -11,9 +11,11 @@ class CmdTest(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'test', help = 'Test')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('blah', default = '', help = 'The blah argument')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         print('blah = ' + args.blah)
diff --git a/src/python/jw/pkg/cmds/projects/CmdTmplDir.py b/src/python/jw/pkg/cmds/projects/CmdTmplDir.py
index 1f2ef5f1..b87b7447 100644
--- a/src/python/jw/pkg/cmds/projects/CmdTmplDir.py
+++ b/src/python/jw/pkg/cmds/projects/CmdTmplDir.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -15,10 +15,12 @@ class CmdTmplDir(Cmd):  # export
             help = 'Print directory containing templates of a given module',
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         r = []
         for m in args.module:
diff --git a/src/python/jw/pkg/cmds/projects/check/Cmd.py b/src/python/jw/pkg/cmds/projects/check/Cmd.py
index 1e8132ef..139f7f58 100644
--- a/src/python/jw/pkg/cmds/projects/check/Cmd.py
+++ b/src/python/jw/pkg/cmds/projects/check/Cmd.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ....CmdBase import CmdBase as Base
 from ..CmdCheck import CmdCheck as Parent
@@ -13,6 +13,7 @@ class Cmd(Base):  # export
     def __init__(self, parent: Parent, name: str, help: str) -> None:
         super().__init__(parent, name, help)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
 
diff --git a/src/python/jw/pkg/cmds/projects/check/CmdDep.py b/src/python/jw/pkg/cmds/projects/check/CmdDep.py
index 478b26ae..47c574a9 100644
--- a/src/python/jw/pkg/cmds/projects/check/CmdDep.py
+++ b/src/python/jw/pkg/cmds/projects/check/CmdDep.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from ....lib.log import NOTICE, log
 from .Cmd import Cmd, Parent
@@ -17,11 +17,13 @@ class CmdDep(Cmd):  # export
             help = 'Check for circular dependencies between given modules',
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('module', nargs = '*', help = 'Modules')
         parser.add_argument('-f', '--flavour', nargs = '?', default = 'build')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         cycle = self.app.find_circular_deps(args.module, args.flavour)
         if cycle:
diff --git a/src/python/jw/pkg/cmds/secrets/Cmd.py b/src/python/jw/pkg/cmds/secrets/Cmd.py
index 83c52af3..9b02e6e6 100644
--- a/src/python/jw/pkg/cmds/secrets/Cmd.py
+++ b/src/python/jw/pkg/cmds/secrets/Cmd.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from functools import cached_property
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ...CmdBase import CmdBase as Base
 from ..CmdSecrets import CmdSecrets as Parent
@@ -46,6 +46,7 @@ class Cmd(Base):  # export
     def __init__(self, parent: Parent, name: str, help: str) -> None:
         super().__init__(parent, name, help)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('packages', nargs = '*', help = 'Package names')
diff --git a/src/python/jw/pkg/cmds/secrets/CmdCompileTemplates.py b/src/python/jw/pkg/cmds/secrets/CmdCompileTemplates.py
index dfaad815..0ce4cfb6 100644
--- a/src/python/jw/pkg/cmds/secrets/CmdCompileTemplates.py
+++ b/src/python/jw/pkg/cmds/secrets/CmdCompileTemplates.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 from .lib.base import Attrs
@@ -15,10 +15,12 @@ class CmdCompileTemplates(Cmd):  # export
             parent, 'compile-templates', help = 'Compile package template files'
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         attrs = Attrs(args.mode, args.owner, args.group, None)
         await self._compile_template_files(args.packages, attrs)
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
diff --git a/src/python/jw/pkg/cmds/secrets/CmdInstall.py b/src/python/jw/pkg/cmds/secrets/CmdInstall.py
index dadbd4f0..d754bdb5 100644
--- a/src/python/jw/pkg/cmds/secrets/CmdInstall.py
+++ b/src/python/jw/pkg/cmds/secrets/CmdInstall.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -18,6 +18,7 @@ class CmdInstall(Cmd):  # export
             ),
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         parser.add_argument('src', help = 'URI of secret source')
         parser.add_argument(
@@ -28,6 +29,7 @@ class CmdInstall(Cmd):  # export
         )
         super().add_arguments(parser)
 
+    @override
     async def _run(self, args: Namespace) -> None:
         packages = [] if args.packages == ['all'] else args.packages
         await self.ctx.install(args.src, packages, args.only_missing)
diff --git a/src/python/jw/pkg/cmds/secrets/CmdListCompilationOutput.py b/src/python/jw/pkg/cmds/secrets/CmdListCompilationOutput.py
index 3b9d3e3c..8bc95fe3 100644
--- a/src/python/jw/pkg/cmds/secrets/CmdListCompilationOutput.py
+++ b/src/python/jw/pkg/cmds/secrets/CmdListCompilationOutput.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -16,6 +16,7 @@ class CmdListCompilationOutput(Cmd):  # export
             help = 'List package compilation output files',
         )
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -25,6 +26,7 @@ class CmdListCompilationOutput(Cmd):  # export
             help = 'Show all output targets, including non-existent files',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         print(
             '\n'.join(
diff --git a/src/python/jw/pkg/cmds/secrets/CmdListSecrets.py b/src/python/jw/pkg/cmds/secrets/CmdListSecrets.py
index 1950a187..8a51fa93 100644
--- a/src/python/jw/pkg/cmds/secrets/CmdListSecrets.py
+++ b/src/python/jw/pkg/cmds/secrets/CmdListSecrets.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -12,6 +12,7 @@ class CmdListSecrets(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'list-secrets', help = 'List package secret files')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(
@@ -21,6 +22,7 @@ class CmdListSecrets(Cmd):  # export
             help = 'Show all secret paths, including non-existent files',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         print(
             '\n'.join(
diff --git a/src/python/jw/pkg/cmds/secrets/CmdListTemplates.py b/src/python/jw/pkg/cmds/secrets/CmdListTemplates.py
index 150faa5c..2f3249cf 100644
--- a/src/python/jw/pkg/cmds/secrets/CmdListTemplates.py
+++ b/src/python/jw/pkg/cmds/secrets/CmdListTemplates.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -12,5 +12,6 @@ class CmdListTemplates(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'list-templates', help = 'List package template files')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         print('\n'.join(await self._list_template_files(args.packages)))
diff --git a/src/python/jw/pkg/cmds/secrets/CmdRmCompilationOutput.py b/src/python/jw/pkg/cmds/secrets/CmdRmCompilationOutput.py
index d1631af4..a420740d 100644
--- a/src/python/jw/pkg/cmds/secrets/CmdRmCompilationOutput.py
+++ b/src/python/jw/pkg/cmds/secrets/CmdRmCompilationOutput.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .Cmd import Cmd, Parent
 
@@ -16,5 +16,6 @@ class CmdRmCompilationOutput(Cmd):  # export
             help = 'Remove package compilation output files',
         )
 
+    @override
     async def _run(self, args: Namespace) -> None:
         await self._remove_compilation_targets(args.packages)
diff --git a/src/python/jw/pkg/lib/App.py b/src/python/jw/pkg/lib/App.py
index 54c6abec..62f5467f 100644
--- a/src/python/jw/pkg/lib/App.py
+++ b/src/python/jw/pkg/lib/App.py
@@ -6,7 +6,7 @@ import os
 import sys
 
 from argparse import ArgumentDefaultsHelpFormatter, ArgumentParser, Namespace
-from typing import TYPE_CHECKING, Any
+from typing import override, TYPE_CHECKING, Any
 
 from .AsyncRunner import AsyncRunner
 from .log import DEBUG, ERR, NOTICE, log, log_m, set_log_flags, set_log_level
@@ -192,6 +192,7 @@ class App:  # export
 
             class NoopCompleter(BaseCompleter):
 
+                @override
                 def __call__(self, *args, **kwargs):
                     return None
 
diff --git a/src/python/jw/pkg/lib/Cmd.py b/src/python/jw/pkg/lib/Cmd.py
index 9a3caa39..ffa76fa6 100644
--- a/src/python/jw/pkg/lib/Cmd.py
+++ b/src/python/jw/pkg/lib/Cmd.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import abc
 import sys
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .log import ERR
 from .Types import LoadTypes, Types
@@ -173,14 +173,18 @@ class Cmd(AbstractCmd):  # export
         self.__description = description if description else help
         self.__aliases = aliases if aliases else []
 
+    @override
     def _name(self) -> str:
         return self.__name
 
+    @override
     def _help(self) -> str:
         return self.__help
 
+    @override
     def _description(self) -> str:
         return self.__description
 
+    @override
     def _aliases(self) -> Iterable[str]:
         return self.__aliases
diff --git a/src/python/jw/pkg/lib/ExecContext.py b/src/python/jw/pkg/lib/ExecContext.py
index b3a103ee..4ca033fc 100644
--- a/src/python/jw/pkg/lib/ExecContext.py
+++ b/src/python/jw/pkg/lib/ExecContext.py
@@ -5,7 +5,7 @@ import errno
 import sys
 
 from decimal import ROUND_FLOOR, Decimal
-from typing import TYPE_CHECKING, NamedTuple
+from typing import override, TYPE_CHECKING, NamedTuple
 
 if TYPE_CHECKING:
     from typing import Type
@@ -250,6 +250,7 @@ class ExecContext(Base):
         super().__init__(*args, **kwargs)
 
     @classmethod
+    @override
     def create(cls, *args, **kwargs) -> ExecContext:
         ret = super().create(*args, **kwargs)
         if not isinstance(ret, cls):
@@ -451,6 +452,7 @@ class ExecContext(Base):
             cc.check_exit_code(ret)
         return ret
 
+    @override
     async def _get(
         self, path: str, wd: str | None, throw: bool, verbose: bool | None, title: str
     ) -> Result:
@@ -485,6 +487,7 @@ class ExecContext(Base):
             cc.check_exit_code(ret)
         return ret
 
+    @override
     async def _put(
         self,
         path: str,
@@ -565,22 +568,27 @@ class ExecContext(Base):
             log(ERR, msg)
         return ret
 
+    @override
     async def _unlink(self, path: str) -> None:
         cmd = ['rm', '-f', path]
         await self.run(cmd, cmd_input = InputMode.NonInteractive)
 
+    @override
     async def _erase(self, path: str) -> None:
         cmd = ['rm', '-rf', path]
         await self.run(cmd, cmd_input = InputMode.NonInteractive)
 
+    @override
     async def _rename(self, src: str, dst: str) -> None:
         cmd = ['mv', src, dst]
         await self.run(cmd, cmd_input = InputMode.NonInteractive)
 
+    @override
     async def _mkdir(self, path: str, mode: int) -> None:
         cmd = ['mkdir', path, '-m', self.__mode_str(mode)]
         await self.run(cmd, cmd_input = InputMode.NonInteractive)
 
+    @override
     async def _mktemp(self, tmpl: str, directory: bool) -> str:
         cmd = ['mktemp']
         if directory:
@@ -593,6 +601,7 @@ class ExecContext(Base):
             )
         return result.stdout_str.strip()
 
+    @override
     async def _stat(self, path: str, follow_symlinks: bool) -> StatResult:
 
         async def __stat(opts: list[str]) -> Result:
@@ -662,6 +671,7 @@ class ExecContext(Base):
         assert stdout is not None  # Just there to pacify the linter
         return _build_stat_result(stdout.rstrip('\n').split(_US), mode_base = 8)
 
+    @override
     async def _chown(self, path: str, owner: str | None, group: str | None) -> None:
         if owner is None and group is None:
             raise ValueError(f'Tried to chown("{path}") without owner and group')
@@ -674,6 +684,7 @@ class ExecContext(Base):
         assert ownership is not None  # Impossible, just there to calm the linter
         await self.run(['chown', ownership, path], cmd_input = InputMode.NonInteractive)
 
+    @override
     async def _chmod(self, path: str, mode: int) -> None:
         await self.run(
             ['chmod', self.__mode_str(mode), path],
diff --git a/src/python/jw/pkg/lib/FileContext.py b/src/python/jw/pkg/lib/FileContext.py
index c158a016..49dc751b 100644
--- a/src/python/jw/pkg/lib/FileContext.py
+++ b/src/python/jw/pkg/lib/FileContext.py
@@ -4,7 +4,7 @@ import abc
 
 from enum import Enum, auto
 from functools import cached_property
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from .log import DEBUG, ERR, log
 from .Uri import Uri
@@ -50,6 +50,7 @@ class FileContext(abc.ABC):
     async def __aexit__(self, exc_type, exc, tb):
         await self.close()
 
+    @override
     def __repr__(self) -> str:
         return self.__uri.id
 
diff --git a/src/python/jw/pkg/lib/Package.py b/src/python/jw/pkg/lib/Package.py
index 63c47ff8..1f3fb2dc 100644
--- a/src/python/jw/pkg/lib/Package.py
+++ b/src/python/jw/pkg/lib/Package.py
@@ -1,4 +1,4 @@
-from typing import Any
+from typing import override, Any
 
 meta_tags = [
     'name',
@@ -56,6 +56,7 @@ class Package:
         self.url = url
         self.maintainer = maintainer
 
+    @override
     def __repr__(self) -> str:
         global meta_tags
         return '\n'.join([f'{key:<15}: {getattr(self, key)}' for key in meta_tags])
diff --git a/src/python/jw/pkg/lib/PackageFilter.py b/src/python/jw/pkg/lib/PackageFilter.py
index 2643102f..c17df3e7 100644
--- a/src/python/jw/pkg/lib/PackageFilter.py
+++ b/src/python/jw/pkg/lib/PackageFilter.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 import abc
 import re
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from .Package import Package
@@ -25,6 +25,7 @@ class PackageFilterString(PackageFilter):
             raise Exception(f'Unsupported filter string "{definition}"')
         self.__definition = url_rx_str
 
+    @override
     def _match(self, package: Package) -> bool:
         url = package.url
         if url is None:
diff --git a/src/python/jw/pkg/lib/ProcFilter.py b/src/python/jw/pkg/lib/ProcFilter.py
index 42cb0de3..bf5cd2de 100644
--- a/src/python/jw/pkg/lib/ProcFilter.py
+++ b/src/python/jw/pkg/lib/ProcFilter.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import abc
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .base import Result
 
@@ -20,6 +20,7 @@ class ProcFilter(abc.ABC):
 
 class ProcFilterIdentity(ProcFilter):
 
+    @override
     async def _run(self, data: bytes | None) -> Result:
         return Result(data, None, 0)
 
diff --git a/src/python/jw/pkg/lib/ProcFilterGpg.py b/src/python/jw/pkg/lib/ProcFilterGpg.py
index 8d9da943..2ab650ff 100644
--- a/src/python/jw/pkg/lib/ProcFilterGpg.py
+++ b/src/python/jw/pkg/lib/ProcFilterGpg.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from .ProcFilter import ProcFilter
 
@@ -13,6 +13,7 @@ class ProcFilterGpg(ProcFilter):
     def __init__(self, ec: ExecContext) -> None:
         self.__ec = ec
 
+    @override
     async def _run(self, data: bytes | None) -> Result:
         if data is None:
             raise Exception('No data for GPG to decrypt')
diff --git a/src/python/jw/pkg/lib/Result.py b/src/python/jw/pkg/lib/Result.py
index dd32b300..f0a13a81 100644
--- a/src/python/jw/pkg/lib/Result.py
+++ b/src/python/jw/pkg/lib/Result.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from typing import override
+
 class Result:
 
     def __init__(
@@ -113,6 +115,7 @@ class Result:
 
         return ret
 
+    @override
     def __repr__(self) -> str:
         return self.__summarize(verbose = False)
 
diff --git a/src/python/jw/pkg/lib/TarIo.py b/src/python/jw/pkg/lib/TarIo.py
index a9288732..67774d5c 100644
--- a/src/python/jw/pkg/lib/TarIo.py
+++ b/src/python/jw/pkg/lib/TarIo.py
@@ -9,7 +9,7 @@ from tarfile import TarFile, TarInfo
 from .CopyContext import CopyContext
 from .ExecContext import ExecContext
 from .log import DEBUG, ERR, log
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from .base import StatResult
@@ -89,6 +89,7 @@ class TarIo(CopyContext):
 
 class TarIoTarFile(TarIo):
 
+    @override
     async def _extract(self, blob: bytes, root: str | None = None) -> None:
         tf = TarFile(fileobj = io.BytesIO(blob))
         for info in tf.getmembers():
@@ -111,7 +112,16 @@ class TarIoTarFile(TarIo):
 
 class TarIoTarExec(TarIo):
 
+    @override
+    async def _extract(self, blob: bytes, root: str | None = None) -> None:
+        cmd = ['tar']
+        if root is not None:
+            cmd += ['-C', root]
+        cmd += ['-x', '-f', '-']
+        await self.dst.run(cmd, cmd_input = blob)
+
     @property
+    @override
     def dst(self) -> ExecContext:
         ret = super().dst
         if not isinstance(ret, ExecContext):
@@ -120,10 +130,3 @@ class TarIoTarExec(TarIo):
                 'context, which only has a file context'
             )
         return ret
-
-    async def _extract(self, blob: bytes, root: str | None = None) -> None:
-        cmd = ['tar']
-        if root is not None:
-            cmd += ['-C', root]
-        cmd += ['-x', '-f', '-']
-        await self.dst.run(cmd, cmd_input = blob)
diff --git a/src/python/jw/pkg/lib/Types.py b/src/python/jw/pkg/lib/Types.py
index b223168a..04827aac 100644
--- a/src/python/jw/pkg/lib/Types.py
+++ b/src/python/jw/pkg/lib/Types.py
@@ -5,7 +5,7 @@ import os
 import re
 import sys
 
-from typing import TYPE_CHECKING, Generic, Iterable, TypeVar
+from typing import override, TYPE_CHECKING, Generic, Iterable, TypeVar
 
 from .log import ERR, OFF, log, parse_log_level
 
@@ -17,6 +17,7 @@ T = TypeVar('T')
 
 class Types(abc.ABC, Iterable[type[T]], Generic[T]):  # export
 
+    @override
     def __iter__(self) -> Iterator[type[T]]:
         return iter(self._classes())
 
@@ -64,6 +65,7 @@ class LoadTypes(Types[T]):  # export
         if self.__debug_level != OFF:
             log(self.__debug_level, *args, **kwargs)
 
+    @override
     def _stringify(self):
         tf = 'None' if self.__type_filter is None else (
             ', '.join([str(f) for f in self.__type_filter])
@@ -74,6 +76,7 @@ class LoadTypes(Types[T]):  # export
             'mod_names:        ' + ', '.join(self.__mod_names),
         ]
 
+    @override
     def _classes(self) -> Iterable[type[T]]:
 
         if self.__classes is None:
diff --git a/src/python/jw/pkg/lib/Uri.py b/src/python/jw/pkg/lib/Uri.py
index d75f2c92..54472535 100644
--- a/src/python/jw/pkg/lib/Uri.py
+++ b/src/python/jw/pkg/lib/Uri.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import copy
 
 from functools import cached_property
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 if TYPE_CHECKING:
     import urllib.parse
@@ -39,9 +39,11 @@ class Uri:
         self.__username: str | None = None
         self.__password: str | None = None
 
+    @override
     def __repr__(self) -> str:
         return self.full
 
+    @override
     def __str__(self) -> str:
         return self.safe_full_with_username
 
diff --git a/src/python/jw/pkg/lib/distros/arch/Distro.py b/src/python/jw/pkg/lib/distros/arch/Distro.py
index dbcef69b..ded2a903 100644
--- a/src/python/jw/pkg/lib/distros/arch/Distro.py
+++ b/src/python/jw/pkg/lib/distros/arch/Distro.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ...Distro import Distro as Base
 
@@ -26,27 +26,32 @@ class Distro(Base):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
+    @override
     async def _ref(self) -> None:
         raise NotImplementedError(
             'distro refresh is not yet implemented for Arch-like distributions'
         )
 
+    @override
     async def _dup(self, download_only: bool) -> None:
         args = ['-Su']
         if download_only:
             args.append('-w')
         await self.pacman(args)
 
+    @override
     async def _reboot_required(self, verbose: bool) -> bool:
         raise NotImplementedError(
             'distro reboot-required is not yet implemented for Arch-like distributions'
         )
 
+    @override
     async def _select_by_name(self, names: Iterable[str]) -> Iterable[Package]:
         raise NotImplementedError(
             'distro select is not yet implemented for Arch-like distributions'
         )
 
+    @override
     async def _install(self, names: Iterable[str], only_update: bool) -> None:
         if only_update:
             raise NotImplementedError('--only-update is not yet implemented for pacman')
@@ -54,11 +59,13 @@ class Distro(Base):
         args.extend(names)
         await self.pacman(args)
 
+    @override
     async def _delete(self, names: Iterable[str]) -> None:
         raise NotImplementedError(
             'distro delete not yet implemented for Arch-like distributions'
         )
 
+    @override
     async def _pkg_files(self, name: str) -> Iterable[str]:
         raise NotImplementedError(
             'distro pkg ls yet implemented for Arch-like distributions'
diff --git a/src/python/jw/pkg/lib/distros/debian/Distro.py b/src/python/jw/pkg/lib/distros/debian/Distro.py
index d2811f07..fb242192 100644
--- a/src/python/jw/pkg/lib/distros/debian/Distro.py
+++ b/src/python/jw/pkg/lib/distros/debian/Distro.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import os
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ...Distro import Distro as Base
 from ...log import NOTICE, log
@@ -38,9 +38,11 @@ class Distro(Base):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
+    @override
     async def _ref(self) -> None:
         await self.apt_get(['update'])
 
+    @override
     async def _dup(self, download_only: bool) -> None:
         args: list[str] = []
         if download_only:
@@ -48,6 +50,7 @@ class Distro(Base):
         args.append('upgrade')
         await self.apt_get(args)
 
+    @override
     async def _reboot_required(self, verbose: bool) -> bool:
         reboot_required = '/run/reboot_required'
         if os.path.exists(reboot_required):
@@ -64,9 +67,11 @@ class Distro(Base):
             log(NOTICE, f"No. {reboot_required} doesn't exist.")
         return False
 
+    @override
     async def _select_by_name(self, names: Iterable[str]) -> Iterable[Package]:
         return await query_packages(names, ec = self.ctx)
 
+    @override
     async def _install(self, names: Iterable[str], only_update: bool) -> None:
         args = ['install']
         if only_update:
@@ -75,8 +80,10 @@ class Distro(Base):
         args.extend(names)
         await self.apt_get(args)
 
+    @override
     async def _delete(self, names: Iterable[str]) -> None:
         await self.dpkg(['-P', *names], sudo = True)
 
+    @override
     async def _pkg_files(self, name: str) -> Iterable[str]:
         return await list_files(name, ec = self.ctx)
diff --git a/src/python/jw/pkg/lib/distros/suse/Distro.py b/src/python/jw/pkg/lib/distros/suse/Distro.py
index 9969b4a5..51ecc6a5 100644
--- a/src/python/jw/pkg/lib/distros/suse/Distro.py
+++ b/src/python/jw/pkg/lib/distros/suse/Distro.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ...Distro import Distro as Base
 from ...pm.rpm import list_files, query_packages, run_rpm
@@ -43,9 +43,11 @@ class Distro(Base):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
+    @override
     async def _ref(self) -> None:
         await self.zypper(['refresh'])
 
+    @override
     async def _dup(self, download_only: bool) -> None:
         args = ['dup']
         if download_only:
@@ -53,6 +55,7 @@ class Distro(Base):
         args += self.__update_extra_opts
         await self.zypper(args)
 
+    @override
     async def _reboot_required(self, verbose: bool) -> bool:
         opts = []
         if not verbose:
@@ -64,22 +67,27 @@ class Distro(Base):
             return True
         return False
 
+    @override
     async def _select_by_name(self, names: Iterable[str]) -> Iterable[Package]:
         return await query_packages(names, ec = self.ctx)
 
+    @override
     async def _install(self, names: Iterable[str], only_update: bool) -> None:
         cmd = ['update' if only_update else 'install']
         cmd += self.__update_extra_opts
         cmd += names
         await self.zypper(cmd)
 
+    @override
     async def _install_local_files(
         self, paths: Iterable[str], only_update: bool
     ) -> None:
         await self.rpm(['-U', '--reinstall', *paths])
 
+    @override
     async def _delete(self, names: Iterable[str]) -> None:
         await self.rpm(['-e', *names], sudo = True)
 
+    @override
     async def _pkg_files(self, name: str) -> Iterable[str]:
         return await list_files(name, ec = self.ctx)
diff --git a/src/python/jw/pkg/lib/ec/Curl.py b/src/python/jw/pkg/lib/ec/Curl.py
index 7ec2a480..d2fd158f 100644
--- a/src/python/jw/pkg/lib/ec/Curl.py
+++ b/src/python/jw/pkg/lib/ec/Curl.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ..FileContext import FileContext as Base
 
@@ -28,6 +28,7 @@ class Curl(Base):
 
         self.__ec = ec if ec else __local()
 
+    @override
     async def _get(
         self, path: str, wd: str | None, throw: bool, verbose: bool | None, title: str
     ) -> Result:
diff --git a/src/python/jw/pkg/lib/ec/Local.py b/src/python/jw/pkg/lib/ec/Local.py
index 7ebb6fa5..08630e16 100644
--- a/src/python/jw/pkg/lib/ec/Local.py
+++ b/src/python/jw/pkg/lib/ec/Local.py
@@ -7,7 +7,7 @@ import pwd
 import sys
 
 from functools import cache
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ..base import Result, StatResult
 from ..ExecContext import ExecContext as Base
@@ -25,6 +25,7 @@ class Local(Base):
     def _username(self) -> str:
         return pwd.getpwuid(os.getuid()).pw_name
 
+    @override
     async def _run(
         self,
         cmd: list[str],
@@ -155,9 +156,11 @@ class Local(Base):
             if cwd is not None:
                 os.chdir(cwd)
 
+    @override
     async def _unlink(self, path: str) -> None:
         os.unlink(path)
 
+    @override
     async def _erase(self, path: str) -> None:
         if os.path.isdir(path):
             import shutil
@@ -165,26 +168,33 @@ class Local(Base):
             return
         os.unlink(path)
 
+    @override
     async def _rename(self, src: str, dst: str) -> None:
         os.rename(src, dst)
 
+    @override
     async def _mkdir(self, path: str, mode: int) -> None:
         os.mkdir(path, mode)
 
+    @override
     async def _stat(self, path: str, follow_symlinks: bool) -> StatResult:
         return StatResult.from_os(os.stat(path, follow_symlinks = follow_symlinks))
 
+    @override
     async def _file_exists(self, path: str) -> bool:
         return os.path.exists(path)
 
+    @override
     async def _chown(self, path: str, owner: str | None, group: str | None) -> None:
         uid = pwd.getpwnam(owner).pw_uid if owner else -1
         gid = grp.getgrnam(group).gr_gid if group else -1
         os.chown(path, uid, gid)
 
+    @override
     async def _chmod(self, path: str, mode: int) -> None:
         os.chmod(path, mode)
 
+    @override
     async def _is_dir(self, path: str, follow_symlinks: bool) -> bool:
         if (not follow_symlinks) and os.path.islink(path):
             return False
diff --git a/src/python/jw/pkg/lib/ec/SSHClient.py b/src/python/jw/pkg/lib/ec/SSHClient.py
index e920a25b..02814380 100644
--- a/src/python/jw/pkg/lib/ec/SSHClient.py
+++ b/src/python/jw/pkg/lib/ec/SSHClient.py
@@ -5,7 +5,7 @@ import os
 import pwd
 
 from enum import Flag, auto
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 from ..ExecContext import ExecContext
 from ..log import DEBUG, ERR, INFO, NOTICE, get_caller_pos, log, log_m
@@ -42,6 +42,7 @@ class SSHClient(ExecContext):
     ) -> Result:
         pass
 
+    @override
     async def _run(
         self,
         cmd: list[str],
@@ -102,6 +103,7 @@ class SSHClient(ExecContext):
         return self.uri.port
 
     @property
+    @override
     def username(self) -> str | None:
         return self.uri.username
 
diff --git a/src/python/jw/pkg/lib/ec/ssh/AsyncSSH.py b/src/python/jw/pkg/lib/ec/ssh/AsyncSSH.py
index eda9e4bb..13f452fe 100644
--- a/src/python/jw/pkg/lib/ec/ssh/AsyncSSH.py
+++ b/src/python/jw/pkg/lib/ec/ssh/AsyncSSH.py
@@ -1,3 +1,4 @@
+from typing import override
 import asyncio
 import os
 import shlex
@@ -42,10 +43,12 @@ class AsyncSSH(Base):
         self.__connect_timeout = connect_timeout
         self.__conn: asyncssh.SSHClientConnection | None = None
 
+    @override
     async def _open(self) -> None:
         await super()._open()
         await self._conn
 
+    @override
     async def _close(self) -> None:
         if self.__conn is not None:
             try:
@@ -355,6 +358,7 @@ class AsyncSSH(Base):
         stdout = b''.join(stdout_parts) if stdout_parts else None
         return Result(stdout, None, exit_code, cmd = cmd)
 
+    @override
     async def _run_ssh(
         self,
         cmd: list[str],
diff --git a/src/python/jw/pkg/lib/ec/ssh/Exec.py b/src/python/jw/pkg/lib/ec/ssh/Exec.py
index b902d6e4..e0969e29 100644
--- a/src/python/jw/pkg/lib/ec/ssh/Exec.py
+++ b/src/python/jw/pkg/lib/ec/ssh/Exec.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import os
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ...base import InputMode
 from ...util import run_cmd
@@ -48,6 +48,7 @@ class Exec(Base):
                 self.__askpass_orig[key] = os.getenv(key)
                 os.environ[key] = val
 
+    @override
     async def _run_ssh(
         self,
         cmd: list[str],
diff --git a/src/python/jw/pkg/lib/ec/ssh/Paramiko.py b/src/python/jw/pkg/lib/ec/ssh/Paramiko.py
index 09e59358..936a9deb 100644
--- a/src/python/jw/pkg/lib/ec/ssh/Paramiko.py
+++ b/src/python/jw/pkg/lib/ec/ssh/Paramiko.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 # Tolerate missing paramiko imports. jw-pkg is designed to work with what it
 # finds.
@@ -52,15 +52,18 @@ class Paramiko(Base):
     def __scp(self) -> Any:
         return paramiko.SCPClient(self.__client.get_transport())
 
+    @override
     async def _open(self) -> None:
         await super()._open()
         self.__client
 
+    @override
     async def _close(self) -> None:
         if self.___client is not None:
             self.___client.close()
             self.___client = None
 
+    @override
     async def _run_ssh(
         self,
         cmd: list[str],