chore: improve CrewBase typing

lib/crewai/src/crewai/project/annotations.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 from collections.abc import Callable
 from functools import wraps
-from typing import TYPE_CHECKING, Concatenate, ParamSpec, TypeVar
+from typing import TYPE_CHECKING, Any, Concatenate, ParamSpec, TypeVar, overload
 
 from crewai.project.utils import memoize
 
@@ -33,6 +33,7 @@ P2 = ParamSpec("P2")
 R = TypeVar("R")
 R2 = TypeVar("R2")
 T = TypeVar("T")
+SelfT = TypeVar("SelfT")
 
 
 def before_kickoff(meth: Callable[P, R]) -> BeforeKickoffMethod[P, R]:
@@ -155,9 +156,17 @@ def cache_handler(meth: Callable[P, R]) -> CacheHandlerMethod[P, R]:
     return CacheHandlerMethod(memoize(meth))
 
 
+@overload
+def crew(
+    meth: Callable[Concatenate[SelfT, P], Crew],
+) -> Callable[Concatenate[SelfT, P], Crew]: ...
+@overload
 def crew(
     meth: Callable[Concatenate[CrewInstance, P], Crew],
-) -> Callable[Concatenate[CrewInstance, P], Crew]:
+) -> Callable[Concatenate[CrewInstance, P], Crew]: ...
+def crew(
+    meth: Callable[..., Crew],
+) -> Callable[..., Crew]:
     """Marks a method as the main crew execution point.
 
     Args:
@@ -168,7 +177,7 @@ def crew(
     """
 
     @wraps(meth)
-    def wrapper(self: CrewInstance, *args: P.args, **kwargs: P.kwargs) -> Crew:
+    def wrapper(self: CrewInstance, *args: Any, **kwargs: Any) -> Crew:
         """Wrapper that sets up crew before calling the decorated method.
 
         Args:

lib/crewai/src/crewai/project/crew_base.py

@@ -6,7 +6,15 @@ from collections.abc import Callable
 import inspect
 import logging
 from pathlib import Path
-from typing import TYPE_CHECKING, Any, Literal, TypeGuard, TypeVar, TypedDict, cast
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Literal,
+    TypeGuard,
+    TypeVar,
+    TypedDict,
+    cast,
+)
 
 from dotenv import load_dotenv
 import yaml
@@ -320,14 +328,17 @@ def get_mcp_tools(self: CrewInstance, *tool_names: str) -> list[BaseTool]:
     if not self.mcp_server_params:
         return []
 
-    from crewai_tools import MCPServerAdapter  # type: ignore[import-untyped]
+    from crewai_tools import MCPServerAdapter
 
     if self._mcp_server_adapter is None:
         self._mcp_server_adapter = MCPServerAdapter(
             self.mcp_server_params, connect_timeout=self.mcp_connect_timeout
         )
 
-    return self._mcp_server_adapter.tools.filter_by_names(tool_names or None)
+    return cast(
+        list[BaseTool],
+        self._mcp_server_adapter.tools.filter_by_names(tool_names or None),
+    )
 
 
 def _load_config(
@@ -630,3 +641,17 @@ class CrewBase(metaclass=_CrewBaseType):
     Note:
         Reference: https://stackoverflow.com/questions/11091609/setting-a-class-metaclass-using-a-decorator
     """
+
+    # e
+    if TYPE_CHECKING:
+
+        def __init__(self, *args: Any, **kwargs: Any) -> None:
+            """Type stub for decorator usage.
+
+            Args:
+                decorated_cls: Class to transform with CrewBaseMeta metaclass.
+
+            Returns:
+                New class with CrewBaseMeta metaclass applied.
+            """
+            ...

lib/crewai/src/crewai/project/wrappers.py

@@ -124,7 +124,7 @@ class CrewClass(Protocol):
     get_mcp_tools: Callable[..., list[BaseTool]]
     _load_config: Callable[..., dict[str, Any]]
     load_configurations: Callable[..., None]
-    load_yaml: staticmethod
+    load_yaml: Callable[..., dict[str, Any]]
     map_all_agent_variables: Callable[..., None]
     _map_agent_variables: Callable[..., None]
     map_all_task_variables: Callable[..., None]