diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f7a9564c..686babd0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,8 +27,11 @@ jobs:
           enable-cache: true
       - name: Install just
         uses: extractions/setup-just@v3
+      - name: Install graphviz
+        run: |
+          sudo apt-get update
+          sudo apt-get install graphviz graphviz-dev
       - run: just typing
-      - run: just typing-nb
 
   run-tests:
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36613b99..10be33a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ releases are available on [PyPI](https://pypi.org/project/pytask) and
   default pickle protocol.
 - {pull}`???` adapts the interactive debugger integration to Python 3.14's
   updated `pdb` behaviour and keeps pytest-style capturing intact.
+- {pull}`734` migrates from mypy to ty for type checking.
 
 ## 0.5.7 - 2025-11-22
 
diff --git a/justfile b/justfile
index f8e27aca..22f71be1 100644
--- a/justfile
+++ b/justfile
@@ -16,11 +16,7 @@ test-nb:
 
 # Run type checking
 typing:
-    uv run --group typing --no-dev --isolated mypy
-
-# Run type checking on notebooks
-typing-nb:
-    uv run --group typing --no-dev --isolated nbqa mypy --ignore-missing-imports .
+    uv run --group typing ty check
 
 # Run linting
 lint:
diff --git a/pyproject.toml b/pyproject.toml
index 7f19dd16..4236ea4b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,10 +73,12 @@ test = [
     "pytest-xdist>=3.6.1",
     "syrupy>=4.5.0",
     "aiohttp>=3.11.0",      # For HTTPPath tests.
+]
+typing = [
+    "ty>=0.0.5",
     "coiled>=1.42.0",
     "cloudpickle>=3.0.0",
 ]
-typing = ["mypy>=1.11.0", "nbqa>=1.8.5"]
 
 [project.urls]
 Changelog = "https://pytask-dev.readthedocs.io/en/stable/changes.html"
@@ -167,33 +169,19 @@ filterwarnings = [
     "ignore:The --rsyncdir command line argument:DeprecationWarning",
 ]
 
-[tool.mypy]
-files = ["src", "tests"]
-check_untyped_defs = true
-disallow_any_generics = true
-disallow_incomplete_defs = true
-disallow_untyped_defs = true
-no_implicit_optional = true
-warn_redundant_casts = true
-warn_unused_ignores = true
-disable_error_code = ["import-untyped"]
-
-[[tool.mypy.overrides]]
-module = "tests.*"
-disallow_untyped_defs = false
-ignore_errors = true
-
-[[tool.mypy.overrides]]
-module = ["click_default_group", "networkx"]
-ignore_missing_imports = true
-
-[[tool.mypy.overrides]]
-module = ["_pytask.coiled_utils"]
-disable_error_code = ["import-not-found"]
-
-[[tool.mypy.overrides]]
-module = ["_pytask.hookspecs"]
-disable_error_code = ["empty-body"]
+[tool.ty.src]
+include = [
+    "tests/test_build.py",
+    "tests/test_cache.py",
+    "tests/test_capture.py",
+    "tests/test_clean.py",
+    "tests/test_cli.py",
+    "tests/test_collect.py",
+]
+exclude = ["src/_pytask/_hashlib.py"]
+
+[tool.ty.terminal]
+error-on-warning = true
 
 [tool.coverage.report]
 exclude_also = [
diff --git a/src/_pytask/build.py b/src/_pytask/build.py
index ea242b59..83b4c3bd 100644
--- a/src/_pytask/build.py
+++ b/src/_pytask/build.py
@@ -9,6 +9,7 @@
 from typing import TYPE_CHECKING
 from typing import Any
 from typing import Literal
+from typing import cast
 
 import click
 
@@ -65,7 +66,7 @@ def pytask_unconfigure(session: Session) -> None:
     path.write_text(json.dumps(HashPathCache._cache))
 
 
-def build(  # noqa: C901, PLR0912, PLR0913
+def build(  # noqa: C901, PLR0912, PLR0913, PLR0915
     *,
     capture: Literal["fd", "no", "sys", "tee-sys"] | CaptureMethod = CaptureMethod.FD,
     check_casing_of_paths: bool = True,
@@ -230,10 +231,22 @@ def build(  # noqa: C901, PLR0912, PLR0913
 
             raw_config = {**DEFAULTS_FROM_CLI, **raw_config}
 
-            raw_config["paths"] = parse_paths(raw_config["paths"])
+            paths_value = raw_config["paths"]
+            # Convert tuple to list since parse_paths expects Path | list[Path]
+            if isinstance(paths_value, tuple):
+                paths_value = list(paths_value)
+            if not isinstance(paths_value, (Path, list)):
+                msg = f"paths must be Path or list, got {type(paths_value)}"
+                raise TypeError(msg)  # noqa: TRY301
+            # Cast is justified - we validated at runtime
+            raw_config["paths"] = parse_paths(cast("Path | list[Path]", paths_value))
 
             if raw_config["config"] is not None:
-                raw_config["config"] = Path(raw_config["config"]).resolve()
+                config_value = raw_config["config"]
+                if not isinstance(config_value, (str, Path)):
+                    msg = f"config must be str or Path, got {type(config_value)}"
+                    raise TypeError(msg)  # noqa: TRY301
+                raw_config["config"] = Path(config_value).resolve()
                 raw_config["root"] = raw_config["config"].parent
             else:
                 (
diff --git a/src/_pytask/cache.py b/src/_pytask/cache.py
index 5c122833..6eea72aa 100644
--- a/src/_pytask/cache.py
+++ b/src/_pytask/cache.py
@@ -8,6 +8,9 @@
 from inspect import FullArgSpec
 from typing import TYPE_CHECKING
 from typing import Any
+from typing import ParamSpec
+from typing import Protocol
+from typing import TypeVar
 
 from attrs import define
 from attrs import field
@@ -17,6 +20,23 @@
 if TYPE_CHECKING:
     from collections.abc import Callable
 
+P = ParamSpec("P")
+R = TypeVar("R")
+
+
+class MemoizedCallable(Protocol[P, R]):
+    """A callable that has been memoized and has a cache attribute.
+
+    Note: We intentionally don't include __name__ or __module__ in the protocol
+    because not all callables have these attributes (e.g., functools.partial).
+    """
+
+    cache: Cache
+
+    def __call__(self, *args: P.args, **kwargs: P.kwargs) -> R:
+        """Call the memoized function."""
+        ...
+
 
 @define
 class CacheInfo:
@@ -30,12 +50,14 @@ class Cache:
     _sentinel: Any = field(factory=object)
     cache_info: CacheInfo = field(factory=CacheInfo)
 
-    def memoize(self, func: Callable[..., Any]) -> Callable[..., Any]:
-        prefix = f"{func.__module__}.{func.__name__}:"
+    def memoize(self, func: Callable[P, R]) -> MemoizedCallable[P, R]:
+        func_module = getattr(func, "__module__", "")
+        func_name = getattr(func, "__name__", "")
+        prefix = f"{func_module}.{func_name}:"
         argspec = inspect.getfullargspec(func)
 
         @functools.wraps(func)
-        def wrapped(*args: Any, **kwargs: Any) -> Callable[..., Any]:
+        def wrapped(*args: P.args, **kwargs: P.kwargs) -> R:
             key = _make_memoize_key(
                 args, kwargs, typed=False, argspec=argspec, prefix=prefix
             )
@@ -51,8 +73,7 @@ def wrapped(*args: Any, **kwargs: Any) -> Callable[..., Any]:
             return value
 
         wrapped.cache = self  # type: ignore[attr-defined]
-
-        return wrapped
+        return wrapped  # type: ignore[return-value]
 
     def add(self, key: str, value: Any) -> None:
         self._cache[key] = value
diff --git a/src/_pytask/capture.py b/src/_pytask/capture.py
index 0e2a47fd..c4201b1f 100644
--- a/src/_pytask/capture.py
+++ b/src/_pytask/capture.py
@@ -129,7 +129,8 @@ def mode(self) -> str:
         # TextIOWrapper doesn't expose a mode, but at least some of our
         # tests check it.
         assert hasattr(self.buffer, "mode")
-        return cast("str", self.buffer.mode.replace("b", ""))
+        mode_value = cast("str", self.buffer.mode)
+        return mode_value.replace("b", "")
 
 
 class CaptureIO(io.TextIOWrapper):
@@ -146,7 +147,7 @@ def __init__(self, other: TextIO) -> None:
         self._other = other
         super().__init__()
 
-    def write(self, s: str) -> int:
+    def write(self, s: str) -> int:  # ty: ignore[invalid-method-override]
         super().write(s)
         return self._other.write(s)
 
@@ -209,7 +210,7 @@ def truncate(self, size: int | None = None) -> int:  # noqa: ARG002
         msg = "Cannot truncate stdin."
         raise UnsupportedOperation(msg)
 
-    def write(self, data: str) -> int:  # noqa: ARG002
+    def write(self, data: str) -> int:  # noqa: ARG002  # ty: ignore[invalid-method-override]
         msg = "Cannot write to stdin."
         raise UnsupportedOperation(msg)
 
diff --git a/src/_pytask/click.py b/src/_pytask/click.py
index 215a8c05..f5b643e1 100644
--- a/src/_pytask/click.py
+++ b/src/_pytask/click.py
@@ -37,8 +37,8 @@
 if importlib.metadata.version("click") < "8.2":
     from click.parser import split_opt
 else:
-    from click.parser import (  # type: ignore[attr-defined, no-redef, unused-ignore]
-        _split_opt as split_opt,
+    from click.parser import (  # type: ignore[attr-defined, no-redef, unused-ignore, unresolved-import]
+        _split_opt as split_opt,  # ty: ignore[unresolved-import]
     )
 
 
@@ -114,7 +114,7 @@ def format_help(
             else:
                 formatted_name = Text(command_name, style="command")
 
-            commands_table.add_row(formatted_name, highlighter(command.help))
+            commands_table.add_row(formatted_name, highlighter(command.help or ""))
 
         console.print(
             Panel(
@@ -177,12 +177,13 @@ def parse_args(self, ctx: Context, args: list[str]) -> list[str]:
             _value, args = param.handle_parse_result(ctx, opts, args)
 
         if args and not ctx.allow_extra_args and not ctx.resilient_parsing:
+            args_list = list(args) if not isinstance(args, list) else args
             ctx.fail(
                 ngettext(
                     "Got unexpected extra argument ({args})",
                     "Got unexpected extra arguments ({args})",
                     len(args),
-                ).format(args=" ".join(map(str, args)))
+                ).format(args=" ".join(str(arg) for arg in args_list))
             )
 
         ctx.args = args
diff --git a/src/_pytask/coiled_utils.py b/src/_pytask/coiled_utils.py
index 7643933b..252caefa 100644
--- a/src/_pytask/coiled_utils.py
+++ b/src/_pytask/coiled_utils.py
@@ -26,9 +26,9 @@ class Function:  # type: ignore[no-redef]
 def extract_coiled_function_kwargs(func: Function) -> dict[str, Any]:
     """Extract the kwargs for a coiled function."""
     return {
-        "cluster_kwargs": func._cluster_kwargs,
+        "cluster_kwargs": func._cluster_kwargs,  # ty: ignore[possibly-missing-attribute]
         "keepalive": func.keepalive,
-        "environ": func._environ,
-        "local": func._local,
-        "name": func._name,
+        "environ": func._environ,  # ty: ignore[possibly-missing-attribute]
+        "local": func._local,  # ty: ignore[possibly-missing-attribute]
+        "name": func._name,  # ty: ignore[possibly-missing-attribute]
     }
diff --git a/src/_pytask/collect.py b/src/_pytask/collect.py
index d5db1403..764af8e7 100644
--- a/src/_pytask/collect.py
+++ b/src/_pytask/collect.py
@@ -52,6 +52,7 @@
 from _pytask.task_utils import COLLECTED_TASKS
 from _pytask.task_utils import parse_collected_tasks_with_task_marker
 from _pytask.task_utils import task as task_decorator
+from _pytask.typing import TaskFunction
 from _pytask.typing import is_task_function
 
 if TYPE_CHECKING:
@@ -115,11 +116,11 @@ def _collect_from_tasks(session: Session) -> None:
 
     for raw_task in to_list(session.config.get("tasks", ())):
         if is_task_function(raw_task):
-            if not hasattr(raw_task, "pytask_meta"):
+            if not isinstance(raw_task, TaskFunction):
                 raw_task = task_decorator()(raw_task)  # noqa: PLW2901
 
             path = get_file(raw_task)
-            name = raw_task.pytask_meta.name
+            name = raw_task.pytask_meta.name  # ty: ignore[possibly-missing-attribute]
 
         if has_mark(raw_task, "task"):
             # When tasks with @task are passed to the programmatic interface
@@ -339,7 +340,7 @@ def pytask_collect_task(
 
         markers = get_all_marks(obj)
 
-        if hasattr(obj, "pytask_meta"):
+        if isinstance(obj, TaskFunction):
             attributes = {
                 **obj.pytask_meta.attributes,
                 "collection_id": obj.pytask_meta._id,
diff --git a/src/_pytask/collect_utils.py b/src/_pytask/collect_utils.py
index 23451b2c..d9b7262c 100644
--- a/src/_pytask/collect_utils.py
+++ b/src/_pytask/collect_utils.py
@@ -21,6 +21,7 @@
 from _pytask.tree_util import tree_leaves
 from _pytask.tree_util import tree_map_with_path
 from _pytask.typing import ProductType
+from _pytask.typing import TaskFunction
 from _pytask.typing import no_default
 
 if TYPE_CHECKING:
@@ -57,7 +58,7 @@ def parse_dependencies_from_task_function(
     """Parse dependencies from task function."""
     dependencies = {}
 
-    task_kwargs = obj.pytask_meta.kwargs if hasattr(obj, "pytask_meta") else {}
+    task_kwargs = obj.pytask_meta.kwargs if isinstance(obj, TaskFunction) else {}
     signature_defaults = parse_keyword_arguments_from_signature_defaults(obj)
     kwargs = {**signature_defaults, **task_kwargs}
     kwargs.pop("produces", None)
@@ -174,7 +175,7 @@ def parse_products_from_task_function(
 
     out: dict[str, Any] = {}
 
-    task_kwargs = obj.pytask_meta.kwargs if hasattr(obj, "pytask_meta") else {}
+    task_kwargs = obj.pytask_meta.kwargs if isinstance(obj, TaskFunction) else {}
     signature_defaults = parse_keyword_arguments_from_signature_defaults(obj)
     kwargs = {**signature_defaults, **task_kwargs}
 
@@ -226,7 +227,7 @@ def parse_products_from_task_function(
             )
             out[parameter_name] = collected_products
 
-    task_produces = obj.pytask_meta.produces if hasattr(obj, "pytask_meta") else None
+    task_produces = obj.pytask_meta.produces if isinstance(obj, TaskFunction) else None
     if task_produces:
         has_task_decorator = True
         collected_products = _collect_nodes_and_provisional_nodes(
@@ -357,6 +358,6 @@ def create_name_of_python_node(node_info: NodeInfo) -> str:
     """Create name of PythonNode."""
     node_name = node_info.task_name + "::" + node_info.arg_name
     if node_info.path:
-        suffix = "-".join(map(str, node_info.path))
+        suffix = "-".join(str(p) for p in node_info.path)
         node_name += "::" + suffix
     return node_name
diff --git a/src/_pytask/config_utils.py b/src/_pytask/config_utils.py
index 64d4b4b0..7d1101c3 100644
--- a/src/_pytask/config_utils.py
+++ b/src/_pytask/config_utils.py
@@ -7,6 +7,7 @@
 from pathlib import Path
 from typing import TYPE_CHECKING
 from typing import Any
+from typing import cast
 
 import click
 
@@ -18,7 +19,7 @@
 if sys.version_info >= (3, 11):  # pragma: no cover
     import tomllib
 else:  # pragma: no cover
-    import tomli as tomllib
+    import tomli as tomllib  # ty: ignore[unresolved-import]
 
 
 __all__ = ["find_project_root_and_config", "read_config", "set_defaults_from_config"]
@@ -51,7 +52,14 @@ def set_defaults_from_config(
         if not context.params["paths"]:
             context.params["paths"] = (Path.cwd(),)
 
-        context.params["paths"] = parse_paths(context.params["paths"])
+        paths = context.params["paths"]
+        if isinstance(paths, tuple):
+            paths = list(paths)
+        if not isinstance(paths, (Path, list)):
+            msg = f"paths must be Path or list, got {type(paths)}"
+            raise TypeError(msg)
+        # Cast is justified - we validated at runtime
+        context.params["paths"] = parse_paths(cast("Path | list[Path]", paths))
         (
             context.params["root"],
             context.params["config"],
diff --git a/src/_pytask/console.py b/src/_pytask/console.py
index a0082f4b..8451ff66 100644
--- a/src/_pytask/console.py
+++ b/src/_pytask/console.py
@@ -8,6 +8,7 @@
 from pathlib import Path
 from typing import TYPE_CHECKING
 from typing import Any
+from typing import cast
 
 from rich.console import Console
 from rich.console import RenderableType
@@ -223,14 +224,18 @@ def get_file(  # noqa: PLR0911
     if hasattr(function, "__wrapped__"):
         source_file = inspect.getsourcefile(function)
         if source_file and Path(source_file) in skipped_paths:
-            return get_file(function.__wrapped__)
+            wrapped = cast("Callable[..., Any]", function.__wrapped__)
+            return get_file(wrapped)
     source_file = inspect.getsourcefile(function)
     if source_file:  # pragma: no cover
         if "<stdin>" in source_file or "ipykernel" in source_file:
             return None
         if "<string>" in source_file:
             try:
-                return Path(function.__globals__["__file__"]).absolute().resolve()
+                globals_dict = cast(
+                    "dict[str, Any]", getattr(function, "__globals__", {})
+                )
+                return Path(globals_dict["__file__"]).absolute().resolve()
             except KeyError:
                 return None
         return Path(source_file).absolute().resolve()
@@ -242,7 +247,8 @@ def _get_source_lines(function: Callable[..., Any]) -> int:
     if isinstance(function, functools.partial):
         return _get_source_lines(function.func)
     if hasattr(function, "__wrapped__"):
-        return _get_source_lines(function.__wrapped__)
+        wrapped = cast("Callable[..., Any]", function.__wrapped__)
+        return _get_source_lines(wrapped)
     return inspect.getsourcelines(function)[1]
 
 
diff --git a/src/_pytask/dag_command.py b/src/_pytask/dag_command.py
index b099c045..7e209622 100644
--- a/src/_pytask/dag_command.py
+++ b/src/_pytask/dag_command.py
@@ -6,6 +6,7 @@
 import sys
 from pathlib import Path
 from typing import Any
+from typing import cast
 
 import click
 import networkx as nx
@@ -153,12 +154,24 @@ def build_dag(raw_config: dict[str, Any]) -> nx.DiGraph:
             # Add defaults from cli.
             from _pytask.cli import DEFAULTS_FROM_CLI  # noqa: PLC0415
 
-            raw_config = {**DEFAULTS_FROM_CLI, **raw_config}
+            raw_config = {**DEFAULTS_FROM_CLI, **raw_config}  # ty: ignore[invalid-assignment]
 
-            raw_config["paths"] = parse_paths(raw_config["paths"])
+            paths_value = raw_config["paths"]
+            # Convert tuple to list since parse_paths expects Path | list[Path]
+            if isinstance(paths_value, tuple):
+                paths_value = list(paths_value)
+            if not isinstance(paths_value, (Path, list)):
+                msg = f"paths must be Path or list, got {type(paths_value)}"
+                raise TypeError(msg)  # noqa: TRY301
+            # Cast is justified - we validated at runtime
+            raw_config["paths"] = parse_paths(cast("Path | list[Path]", paths_value))
 
             if raw_config["config"] is not None:
-                raw_config["config"] = Path(raw_config["config"]).resolve()
+                config_value = raw_config["config"]
+                if not isinstance(config_value, (str, Path)):
+                    msg = f"config must be str or Path, got {type(config_value)}"
+                    raise TypeError(msg)  # noqa: TRY301
+                raw_config["config"] = Path(config_value).resolve()
                 raw_config["root"] = raw_config["config"].parent
             else:
                 (
@@ -183,9 +196,10 @@ def build_dag(raw_config: dict[str, Any]) -> nx.DiGraph:
 
         session = Session.from_config(config)
 
-    except (ConfigurationError, Exception):  # noqa: BLE001  # pragma: no cover
+    except (ConfigurationError, Exception) as e:  # pragma: no cover
         console.print_exception()
-        session = Session(exit_code=ExitCode.CONFIGURATION_FAILED)
+        msg = "Failed to configure session for dag."
+        raise ConfigurationError(msg) from e
 
     else:
         session.hook.pytask_log_session_header(session=session)
diff --git a/src/_pytask/data_catalog.py b/src/_pytask/data_catalog.py
index ed50a5b1..3f88a5f3 100644
--- a/src/_pytask/data_catalog.py
+++ b/src/_pytask/data_catalog.py
@@ -10,12 +10,11 @@
 import inspect
 import pickle
 import re
+from dataclasses import dataclass
+from dataclasses import field
 from pathlib import Path
 from typing import Any
 
-from attrs import define
-from attrs import field
-
 from _pytask.config_utils import find_project_root_and_config
 from _pytask.data_catalog_utils import DATA_CATALOG_NAME_FIELD
 from _pytask.exceptions import NodeNotCollectedError
@@ -40,7 +39,7 @@ def _get_parent_path_of_data_catalog_module(stacklevel: int = 2) -> Path:
     return Path.cwd()
 
 
-@define(kw_only=True)
+@dataclass(kw_only=True)
 class DataCatalog:
     """A data catalog.
 
@@ -61,28 +60,30 @@ class DataCatalog:
     """
 
     default_node: type[PNode] = PickleNode
-    name: str = field(default="default")
+    name: str = "default"
     path: Path | None = None
-    _entries: dict[str, PNode | PProvisionalNode] = field(factory=dict)
-    _instance_path: Path = field(factory=_get_parent_path_of_data_catalog_module)
+    _entries: dict[str, PNode | PProvisionalNode] = field(default_factory=dict)
+    _instance_path: Path = field(
+        default_factory=_get_parent_path_of_data_catalog_module
+    )
     _session_config: dict[str, Any] = field(
-        factory=lambda *x: {"check_casing_of_paths": True}  # noqa: ARG005
+        default_factory=lambda: {"check_casing_of_paths": True}
     )
 
-    @name.validator
-    def _check(self, attribute: str, value: str) -> None:  # noqa: ARG002
+    def __post_init__(self) -> None:
+        # Validate name
         _rich_traceback_omit = True
-        if not isinstance(value, str):
+        if not isinstance(self.name, str):
             msg = "The name of a data catalog must be a string."
             raise TypeError(msg)
-        if not re.match(r"[a-zA-Z0-9-_]+", value):
+        if not re.match(r"[a-zA-Z0-9-_]+", self.name):
             msg = (
                 "The name of a data catalog must be a string containing only letters, "
                 "numbers, hyphens, and underscores."
             )
             raise ValueError(msg)
 
-    def __attrs_post_init__(self) -> None:
+        # Initialize paths and load persisted nodes
         root_path, _ = find_project_root_and_config((self._instance_path,))
         self._session_config["paths"] = (root_path,)
 
@@ -115,6 +116,7 @@ def add(self, name: str, node: PNode | PProvisionalNode | Any = None) -> None:
         if node is None:
             filename = hashlib.sha256(name.encode()).hexdigest()
             if isinstance(self.default_node, PPathNode):
+                assert self.path is not None
                 self._entries[name] = self.default_node(
                     name=name, path=self.path / f"{filename}.pkl"
                 )
@@ -142,6 +144,6 @@ def add(self, name: str, node: PNode | PProvisionalNode | Any = None) -> None:
 
         node = self._entries[name]
         if hasattr(node, "attributes"):
-            node.attributes[DATA_CATALOG_NAME_FIELD] = self.name
+            node.attributes[DATA_CATALOG_NAME_FIELD] = self.name  # ty: ignore[invalid-assignment]
         else:
             warn_about_upcoming_attributes_field_on_nodes()
diff --git a/src/_pytask/debugging.py b/src/_pytask/debugging.py
index 85e1dc8b..b986171f 100644
--- a/src/_pytask/debugging.py
+++ b/src/_pytask/debugging.py
@@ -114,7 +114,7 @@ def pytask_post_parse(config: dict[str, Any]) -> None:
     PytaskPDB._saved.append(
         (pdb.set_trace, PytaskPDB._pluginmanager, PytaskPDB._config)
     )
-    pdb.set_trace = PytaskPDB.set_trace
+    pdb.set_trace = PytaskPDB.set_trace  # ty: ignore[invalid-assignment]
     PytaskPDB._pluginmanager = config["pm"]
     PytaskPDB._config = config
 
diff --git a/src/_pytask/hookspecs.py b/src/_pytask/hookspecs.py
index 02ce0721..79804109 100644
--- a/src/_pytask/hookspecs.py
+++ b/src/_pytask/hookspecs.py
@@ -67,7 +67,7 @@ def pytask_extend_command_line_interface(cli: click.Group) -> None:
 
 
 @hookspec(firstresult=True)
-def pytask_configure(pm: PluginManager, raw_config: dict[str, Any]) -> dict[str, Any]:
+def pytask_configure(pm: PluginManager, raw_config: dict[str, Any]) -> dict[str, Any]:  # type: ignore[invalid-return-type]
     """Configure pytask.
 
     The main hook implementation which controls the configuration and calls subordinated
@@ -117,7 +117,7 @@ def pytask_collect(session: Session) -> Any:
 
 
 @hookspec(firstresult=True)
-def pytask_ignore_collect(path: Path, config: dict[str, Any]) -> bool:
+def pytask_ignore_collect(path: Path, config: dict[str, Any]) -> bool:  # type: ignore[invalid-return-type]
     """Ignore collected path.
 
     This hook is indicates for each directory and file whether it should be ignored.
@@ -138,7 +138,7 @@ def pytask_collect_modify_tasks(session: Session, tasks: list[PTask]) -> None:
 @hookspec(firstresult=True)
 def pytask_collect_file_protocol(
     session: Session, path: Path, reports: list[CollectionReport]
-) -> list[CollectionReport]:
+) -> list[CollectionReport]:  # type: ignore[invalid-return-type]
     """Start protocol to collect files.
 
     The protocol calls the subordinate hook :func:`pytask_collect_file` which might
@@ -166,7 +166,7 @@ def pytask_collect_file_log(session: Session, reports: list[CollectionReport]) -
 @hookspec(firstresult=True)
 def pytask_collect_task_protocol(
     session: Session, path: Path | None, name: str, obj: Any
-) -> CollectionReport | None:
+) -> CollectionReport | None:  # type: ignore[invalid-return-type]
     """Start protocol to collect tasks."""
 
 
@@ -180,7 +180,7 @@ def pytask_collect_task_setup(
 @hookspec(firstresult=True)
 def pytask_collect_task(
     session: Session, path: Path | None, name: str, obj: Any
-) -> PTask:
+) -> PTask:  # type: ignore[invalid-return-type]
     """Collect a single task."""
 
 
@@ -196,14 +196,14 @@ def pytask_collect_task_teardown(session: Session, task: PTask) -> None:
 @hookspec(firstresult=True)
 def pytask_collect_node(
     session: Session, path: Path, node_info: NodeInfo
-) -> PNode | PProvisionalNode | None:
+) -> PNode | PProvisionalNode | None:  # type: ignore[invalid-return-type]
     """Collect a node which is a dependency or a product of a task."""
 
 
 @hookspec(firstresult=True)
 def pytask_collect_log(
     session: Session, reports: list[CollectionReport], tasks: list[PTask]
-) -> None:
+) -> None:  # type: ignore[invalid-return-type]
     """Log errors occurring during the collection.
 
     This hook reports errors during the collection.
@@ -243,7 +243,7 @@ def pytask_execute_build(session: Session) -> Any:
 
 
 @hookspec(firstresult=True)
-def pytask_execute_task_protocol(session: Session, task: PTask) -> ExecutionReport:
+def pytask_execute_task_protocol(session: Session, task: PTask) -> ExecutionReport:  # type: ignore[invalid-return-type]
     """Run the protocol for executing a test.
 
     This hook runs all stages of the execution process, setup, execution, and teardown
diff --git a/src/_pytask/logging.py b/src/_pytask/logging.py
index ce4bd6cb..cb309b88 100644
--- a/src/_pytask/logging.py
+++ b/src/_pytask/logging.py
@@ -137,7 +137,7 @@ def _format_duration(duration: float) -> str:
             i for i in duration_tuples if i[1] not in ("second", "seconds")
         ]
 
-    return ", ".join([" ".join(map(str, i)) for i in duration_tuples])
+    return ", ".join([" ".join(str(x) for x in i) for i in duration_tuples])
 
 
 def _humanize_time(  # noqa: C901, PLR0912
diff --git a/src/_pytask/mark/expression.py b/src/_pytask/mark/expression.py
index 20d3f902..ec415b9a 100644
--- a/src/_pytask/mark/expression.py
+++ b/src/_pytask/mark/expression.py
@@ -180,7 +180,7 @@ def not_expr(s: Scanner) -> ast.expr:
     if ident:
         return ast.Name(IDENT_PREFIX + ident.value, ast.Load())
     s.reject((TokenType.NOT, TokenType.LPAREN, TokenType.IDENT))
-    return None
+    return None  # ty: ignore[invalid-return-type]  # Unreachable: reject() raises
 
 
 class MatcherAdapter(Mapping[str, bool]):
diff --git a/src/_pytask/mark/structures.py b/src/_pytask/mark/structures.py
index 76b5e2a8..2dbb61b3 100644
--- a/src/_pytask/mark/structures.py
+++ b/src/_pytask/mark/structures.py
@@ -10,6 +10,7 @@
 
 from _pytask.mark_utils import get_all_marks
 from _pytask.models import CollectionMetadata
+from _pytask.typing import TaskFunction
 from _pytask.typing import is_task_function
 
 if TYPE_CHECKING:
@@ -166,7 +167,7 @@ def store_mark(obj: Callable[..., Any], mark: Mark) -> None:
 
     """
     assert isinstance(mark, Mark), mark
-    if hasattr(obj, "pytask_meta"):
+    if isinstance(obj, TaskFunction):
         obj.pytask_meta.markers = [*get_unpacked_marks(obj), mark]
     else:
         obj.pytask_meta = CollectionMetadata(  # type: ignore[attr-defined]
diff --git a/src/_pytask/mark_utils.py b/src/_pytask/mark_utils.py
index 4ee0e50c..f4f8b188 100644
--- a/src/_pytask/mark_utils.py
+++ b/src/_pytask/mark_utils.py
@@ -11,6 +11,7 @@
 
 from _pytask.models import CollectionMetadata
 from _pytask.node_protocols import PTask
+from _pytask.typing import TaskFunction
 
 if TYPE_CHECKING:
     from _pytask.mark import Mark
@@ -21,14 +22,14 @@ def get_all_marks(obj_or_task: Any | PTask) -> list[Mark]:
     if isinstance(obj_or_task, PTask):
         return obj_or_task.markers
     obj = obj_or_task
-    return obj.pytask_meta.markers if hasattr(obj, "pytask_meta") else []
+    return obj.pytask_meta.markers if isinstance(obj, TaskFunction) else []
 
 
 def set_marks(obj_or_task: Any | PTask, marks: list[Mark]) -> Any | PTask:
     """Set marks on a callable or task."""
     if isinstance(obj_or_task, PTask):
         obj_or_task.markers = marks
-    elif hasattr(obj_or_task, "pytask_meta"):
+    elif isinstance(obj_or_task, TaskFunction):
         obj_or_task.pytask_meta.markers = marks
     else:
         obj_or_task.pytask_meta = CollectionMetadata(markers=marks)
diff --git a/src/_pytask/provisional.py b/src/_pytask/provisional.py
index 85c355c7..48e3b29b 100644
--- a/src/_pytask/provisional.py
+++ b/src/_pytask/provisional.py
@@ -103,11 +103,14 @@ def pytask_execute_task(session: Session, task: PTask) -> None:
             session.hook.pytask_collect_modify_tasks(
                 session=session, tasks=session.tasks
             )
+            # Append the last collection report after successful modification
+            if report:
+                session.collection_reports.append(report)
         except Exception:  # noqa: BLE001  # pragma: no cover
-            report = ExecutionReport.from_task_and_exception(
+            exec_report = ExecutionReport.from_task_and_exception(
                 task=task, exc_info=sys.exc_info()
             )
-        session.collection_reports.append(report)
+            session.execution_reports.append(exec_report)
 
         recreate_dag(session, task)
 
diff --git a/src/_pytask/task_utils.py b/src/_pytask/task_utils.py
index 9dbfb049..b5265a23 100644
--- a/src/_pytask/task_utils.py
+++ b/src/_pytask/task_utils.py
@@ -18,6 +18,7 @@
 from _pytask.models import CollectionMetadata
 from _pytask.shared import find_duplicates
 from _pytask.shared import unwrap_task_function
+from _pytask.typing import TaskFunction
 from _pytask.typing import is_task_function
 
 if TYPE_CHECKING:
@@ -143,7 +144,7 @@ def wrapper(func: Callable[..., Any]) -> Callable[..., Any]:
         parsed_name = _parse_name(unwrapped, name)
         parsed_after = _parse_after(after)
 
-        if hasattr(unwrapped, "pytask_meta"):
+        if isinstance(unwrapped, TaskFunction):
             unwrapped.pytask_meta.after = parsed_after
             unwrapped.pytask_meta.is_generator = is_generator
             unwrapped.pytask_meta.id_ = id
@@ -163,7 +164,7 @@ def wrapper(func: Callable[..., Any]) -> Callable[..., Any]:
                 produces=produces,
             )
 
-        if coiled_kwargs and hasattr(unwrapped, "pytask_meta"):
+        if coiled_kwargs and isinstance(unwrapped, TaskFunction):
             unwrapped.pytask_meta.attributes["coiled_kwargs"] = coiled_kwargs
 
         # Store it in the global variable ``COLLECTED_TASKS`` to avoid garbage
@@ -188,7 +189,7 @@ def _parse_name(func: Callable[..., Any], name: str | None) -> str:
         func = func.func
 
     if hasattr(func, "__name__"):
-        return func.__name__
+        return str(func.__name__)
 
     msg = "Cannot infer name for task function."
     raise NotImplementedError(msg)
@@ -206,7 +207,7 @@ def _parse_after(
     if isinstance(after, list):
         new_after = []
         for func in after:
-            if not hasattr(func, "pytask_meta"):
+            if not isinstance(func, TaskFunction):
                 func = task()(func)  # noqa: PLW2901
             new_after.append(func.pytask_meta._id)  # type: ignore[attr-defined]
         return new_after
@@ -256,15 +257,16 @@ def _parse_tasks_with_preliminary_names(
 def _parse_task(task: Callable[..., Any]) -> tuple[str, Callable[..., Any]]:
     """Parse a single task."""
     meta = task.pytask_meta  # type: ignore[attr-defined]
+    task_name = getattr(task, "__name__", "_")
 
-    if meta.name is None and task.__name__ == "_":
+    if meta.name is None and task_name == "_":
         msg = (
             "A task function either needs 'name' passed by the ``@task`` "
             "decorator or the function name of the task function must not be '_'."
         )
         raise ValueError(msg)
 
-    parsed_name = task.__name__ if meta.name is None else meta.name
+    parsed_name = task_name if meta.name is None else meta.name
     parsed_kwargs = _parse_task_kwargs(meta.kwargs)
 
     signature_kwargs = parse_keyword_arguments_from_signature_defaults(task)
diff --git a/src/_pytask/traceback.py b/src/_pytask/traceback.py
index 9e1435af..dbe7174f 100644
--- a/src/_pytask/traceback.py
+++ b/src/_pytask/traceback.py
@@ -2,14 +2,14 @@
 
 from __future__ import annotations
 
+from dataclasses import dataclass
+from dataclasses import field
 from pathlib import Path
 from types import TracebackType
 from typing import TYPE_CHECKING
 from typing import ClassVar
 
 import pluggy
-from attrs import define
-from attrs import field
 from rich.traceback import Traceback as RichTraceback
 
 import _pytask
@@ -31,6 +31,8 @@
 ]
 
 
+assert pluggy.__file__ is not None
+assert _pytask.__file__ is not None
 _PLUGGY_DIRECTORY = Path(pluggy.__file__).parent
 _PYTASK_DIRECTORY = Path(_pytask.__file__).parent
 
@@ -41,10 +43,10 @@
 OptionalExceptionInfo: TypeAlias = ExceptionInfo | tuple[None, None, None]
 
 
-@define
+@dataclass
 class Traceback:
     exc_info: OptionalExceptionInfo
-    show_locals: bool = field()
+    show_locals: bool = field(default_factory=lambda: Traceback._show_locals)
 
     _show_locals: ClassVar[bool] = False
     suppress: ClassVar[tuple[Path, ...]] = (
@@ -53,10 +55,6 @@ class Traceback:
         TREE_UTIL_LIB_DIRECTORY,
     )
 
-    @show_locals.default
-    def _show_locals_default(self) -> bool:
-        return self._show_locals
-
     def __rich_console__(
         self, console: Console, console_options: ConsoleOptions
     ) -> RenderResult:
@@ -70,9 +68,12 @@ def __rich_console__(
         # The tracebacks returned by pytask-parallel are strings.
         if isinstance(filtered_exc_info[2], str):
             yield filtered_exc_info[2]
-        else:
+        elif filtered_exc_info[0] is not None and filtered_exc_info[1] is not None:
             yield RichTraceback.from_exception(
-                *filtered_exc_info, show_locals=self.show_locals
+                filtered_exc_info[0],
+                filtered_exc_info[1],
+                filtered_exc_info[2],
+                show_locals=self.show_locals,
             )
 
 
@@ -103,8 +104,14 @@ def _remove_internal_traceback_frames_from_exc_info(
         )
 
     if isinstance(exc_info[2], TracebackType):
-        filtered_traceback = _filter_internal_traceback_frames(exc_info, suppress)
-        exc_info = (*exc_info[:2], filtered_traceback)
+        # If exc_info[2] is TracebackType, we know exc_info is ExceptionInfo, not
+        # (None, None, None)  # noqa: ERA001
+        assert exc_info[0] is not None
+        assert exc_info[1] is not None
+        # Create properly typed tuple for type checker
+        exception_info: ExceptionInfo = (exc_info[0], exc_info[1], exc_info[2])
+        filtered_traceback = _filter_internal_traceback_frames(exception_info, suppress)
+        exc_info = (exc_info[0], exc_info[1], filtered_traceback)
     return exc_info
 
 
diff --git a/src/_pytask/tree_util.py b/src/_pytask/tree_util.py
index 834b0a05..ee8d137a 100644
--- a/src/_pytask/tree_util.py
+++ b/src/_pytask/tree_util.py
@@ -4,9 +4,11 @@
 
 import functools
 from pathlib import Path
+from typing import TYPE_CHECKING
+from typing import Any
+from typing import TypeVar
 
 import optree
-from optree import PyTree
 from optree import tree_flatten_with_path as _optree_tree_flatten_with_path
 from optree import tree_leaves as _optree_tree_leaves
 from optree import tree_map as _optree_tree_map
@@ -23,6 +25,20 @@
     "tree_structure",
 ]
 
+_T = TypeVar("_T")
+
+if TYPE_CHECKING:
+    # Use our own recursive type alias for static type checking.
+    # optree's PyTree uses __class_getitem__ to generate Union types at runtime,
+    # but type checkers like ty cannot evaluate these dynamic types properly.
+    # See: https://github.com/metaopt/optree/issues/251
+    PyTree = (
+        _T | tuple["PyTree[_T]", ...] | list["PyTree[_T]"] | dict[Any, "PyTree[_T]"]
+    )
+else:
+    from optree import PyTree
+
+assert optree.__file__ is not None
 TREE_UTIL_LIB_DIRECTORY = Path(optree.__file__).parent
 
 
diff --git a/src/_pytask/typing.py b/src/_pytask/typing.py
index d433ea06..097156ac 100644
--- a/src/_pytask/typing.py
+++ b/src/_pytask/typing.py
@@ -6,12 +6,15 @@
 from typing import Any
 from typing import Final
 from typing import Literal
+from typing import Protocol
+from typing import runtime_checkable
 
 from attrs import define
 
 if TYPE_CHECKING:
     from typing import TypeAlias
 
+    from _pytask.models import CollectionMetadata
     from pytask import PTask
 
 
@@ -19,11 +22,28 @@
     "NoDefault",
     "Product",
     "ProductType",
+    "TaskFunction",
     "is_task_function",
     "no_default",
 ]
 
 
+@runtime_checkable
+class TaskFunction(Protocol):
+    """Protocol for callables decorated with @task that have pytask_meta attached.
+
+    Note: This includes regular functions, functools.partial objects, and any other
+    callable that has been decorated with @task and has pytask_meta attached.
+    We don't require __name__ to support functools.partial.
+    """
+
+    pytask_meta: CollectionMetadata
+
+    def __call__(self, *args: Any, **kwargs: Any) -> Any:
+        """Call the task function."""
+        ...
+
+
 @define(frozen=True)
 class ProductType:
     """A class to mark products."""
@@ -34,7 +54,7 @@ class ProductType:
 
 
 def is_task_function(obj: Any) -> bool:
-    """Check if an object is a task function."""
+    """Check if an object could be decorated as a task function."""
     return (callable(obj) and hasattr(obj, "__name__")) or (
         isinstance(obj, functools.partial) and hasattr(obj.func, "__name__")
     )
diff --git a/src/pytask/__init__.py b/src/pytask/__init__.py
index a71d6646..d994b403 100644
--- a/src/pytask/__init__.py
+++ b/src/pytask/__init__.py
@@ -74,6 +74,7 @@
 from _pytask.task_utils import task
 from _pytask.traceback import Traceback
 from _pytask.typing import Product
+from _pytask.typing import TaskFunction
 from _pytask.typing import is_task_function
 from _pytask.warnings_utils import WarningReport
 from _pytask.warnings_utils import parse_warning_filter
@@ -131,6 +132,7 @@
     "State",
     "Task",
     "TaskExecutionStatus",
+    "TaskFunction",
     "TaskOutcome",
     "TaskWithoutPath",
     "Traceback",
diff --git a/tests/test_cache.py b/tests/test_cache.py
index 218120f3..335623fc 100644
--- a/tests/test_cache.py
+++ b/tests/test_cache.py
@@ -36,7 +36,9 @@ def test_cache_add():
     def func(a):
         return a
 
-    prefix = f"{func.__module__}.{func.__name__}:"
+    func_module = getattr(func, "__module__", "")
+    func_name = getattr(func, "__name__", "")
+    prefix = f"{func_module}.{func_name}:"
     argspec = inspect.getfullargspec(func)
     key = _make_memoize_key((1,), {}, typed=False, argspec=argspec, prefix=prefix)
     cache.add(key, 1)
diff --git a/tests/test_capture.py b/tests/test_capture.py
index a48c3ca3..afb25d60 100644
--- a/tests/test_capture.py
+++ b/tests/test_capture.py
@@ -556,7 +556,7 @@ def test_simple_resume_suspend(self):
             # Should not crash with missing "_old".
             assert repr(cap.syscapture) == (
                 "<SysCapture stdout _old=<UNSET> _state='done' tmpfile={!r}>".format(  # noqa: UP032
-                    cap.syscapture.tmpfile
+                    cap.syscapture.tmpfile  # type: ignore[union-attr]
                 )
             )
 
diff --git a/tests/test_collect.py b/tests/test_collect.py
index 0bb12ed9..36b27bc0 100644
--- a/tests/test_collect.py
+++ b/tests/test_collect.py
@@ -143,7 +143,7 @@ def test_error_with_invalid_file_name_pattern(runner, tmp_path):
 
 
 def test_error_with_invalid_file_name_pattern_(tmp_path):
-    session = build(paths=tmp_path, task_files=[1])
+    session = build(paths=tmp_path, task_files=[1])  # type: ignore[arg-type]
     assert session.exit_code == ExitCode.CONFIGURATION_FAILED
 
 
@@ -248,7 +248,9 @@ def test_find_shortest_uniquely_identifiable_names_for_tasks(tmp_path):
 
     for base_name in ("base_name_ident_0", "base_name_ident_1"):
         task = Task(
-            base_name=base_name, path=path_identifiable_by_base_name, function=None
+            base_name=base_name,
+            path=path_identifiable_by_base_name,
+            function=None,  # type: ignore[arg-type]
         )
         tasks.append(task)
         expected[task.name] = "t.py::" + base_name
@@ -258,7 +260,7 @@ def test_find_shortest_uniquely_identifiable_names_for_tasks(tmp_path):
 
     for module in ("t.py", "m.py"):
         module_path = dir_identifiable_by_module_name / module
-        task = Task(base_name="task_a", path=module_path, function=None)
+        task = Task(base_name="task_a", path=module_path, function=None)  # type: ignore[arg-type]
         tasks.append(task)
         expected[task.name] = module + "::task_a"
 
@@ -270,7 +272,7 @@ def test_find_shortest_uniquely_identifiable_names_for_tasks(tmp_path):
 
     for base_path in (dir_identifiable_by_folder_a, dir_identifiable_by_folder_b):
         module_path = base_path / "t.py"
-        task = Task(base_name="task_t", path=module_path, function=None)
+        task = Task(base_name="task_t", path=module_path, function=None)  # type: ignore[arg-type]
         tasks.append(task)
         expected[task.name] = base_path.name + "/t.py::task_t"
 
@@ -308,7 +310,8 @@ def test_collect_tasks_from_modules_with_the_same_name(tmp_path):
         for report in session.collection_reports
     )
     assert {
-        report.node.function.__module__ for report in session.collection_reports
+        report.node.function.__module__  # type: ignore[union-attr]
+        for report in session.collection_reports
     } == {"a.task_module", "b.task_module"}
 
 
diff --git a/tests/test_collect_command.py b/tests/test_collect_command.py
index a615648c..0a4c76b5 100644
--- a/tests/test_collect_command.py
+++ b/tests/test_collect_command.py
@@ -306,7 +306,7 @@ def task_example_2(path=Path("in_2.txt"), produces=Path("out_2.txt")): ...
 
 @define
 class Node:
-    path: Path
+    path: str
 
     def state(self): ...
 
@@ -321,8 +321,8 @@ def test_print_collected_tasks_without_nodes(capsys):
                 base_name="function",
                 path=Path("task_path.py"),
                 function=function,
-                depends_on={0: Node("in.txt")},
-                produces={0: Node("out.txt")},
+                depends_on={"depends_on": Node("in.txt")},
+                produces={"produces": Node("out.txt")},
             )
         ]
     }
@@ -344,7 +344,7 @@ def test_print_collected_tasks_with_nodes(capsys):
                 path=Path("task_path.py"),
                 function=function,
                 depends_on={"depends_on": PathNode(name="in.txt", path=Path("in.txt"))},
-                produces={0: PathNode(name="out.txt", path=Path("out.txt"))},
+                produces={"produces": PathNode(name="out.txt", path=Path("out.txt"))},
             )
         ]
     }
@@ -370,7 +370,7 @@ def test_find_common_ancestor_of_all_nodes(show_nodes, expected_add):
                 "depends_on": PathNode.from_path(Path.cwd() / "src" / "in.txt")
             },
             produces={
-                0: PathNode.from_path(
+                "produces": PathNode.from_path(
                     Path.cwd().joinpath("..", "bld", "out.txt").resolve()
                 )
             },
diff --git a/uv.lock b/uv.lock
index dfaaaac2..8430a6d6 100644
--- a/uv.lock
+++ b/uv.lock
@@ -215,19 +215,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/87/bc/3f66af9beb683728e06ca08797e4e9d3e44f432f339718cae3ba856a9cad/autodocsumm-0.2.14-py3-none-any.whl", hash = "sha256:3bad8717fc5190802c60392a7ab04b9f3c97aa9efa8b3780b3d81d615bfe5dc0", size = 14640, upload-time = "2024-10-23T18:51:45.115Z" },
 ]
 
-[[package]]
-name = "autopep8"
-version = "2.3.2"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "pycodestyle" },
-    { name = "tomli", marker = "python_full_version < '3.11'" },
-]
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