chore: modernize project module typing

src/crewai/project/annotations.py

@@ -1,87 +1,95 @@
+"""Decorators for defining crew components and their behaviors."""
+
+from collections.abc import Callable
 from functools import wraps
-from typing import Callable
+from typing import Any, Concatenate, ParamSpec, TypeVar
 
 from crewai import Crew
 from crewai.project.utils import memoize
 
-"""Decorators for defining crew components and their behaviors."""
+P = ParamSpec("P")
+R = TypeVar("R")
 
 
-def before_kickoff(func):
+def before_kickoff(func: Callable[P, R]) -> Callable[P, R]:
     """Marks a method to execute before crew kickoff."""
-    func.is_before_kickoff = True
+    func.is_before_kickoff = True  # type: ignore
     return func
 
 
-def after_kickoff(func):
+def after_kickoff(func: Callable[P, R]) -> Callable[P, R]:
     """Marks a method to execute after crew kickoff."""
-    func.is_after_kickoff = True
+    func.is_after_kickoff = True  # type: ignore
     return func
 
 
-def task(func):
+def task(func: Callable[Concatenate[Any, P], R]) -> Callable[Concatenate[Any, P], R]:
     """Marks a method as a crew task."""
-    func.is_task = True
+    func.is_task = True  # type: ignore
 
     @wraps(func)
-    def wrapper(*args, **kwargs):
+    def wrapper(self: Any, *args: P.args, **kwargs: P.kwargs) -> R:
-        result = func(*args, **kwargs)
+        result = func(self, *args, **kwargs)
-        if not result.name:
+        if not result.name:  # type: ignore
-            result.name = func.__name__
+            result.name = func.__name__  # type: ignore
         return result
 
     return memoize(wrapper)
 
 
-def agent(func):
+def agent(func: Callable[Concatenate[Any, P], R]) -> Callable[Concatenate[Any, P], R]:
     """Marks a method as a crew agent."""
-    func.is_agent = True
+    func.is_agent = True  # type: ignore
-    func = memoize(func)
+    return memoize(func)
-    return func
 
 
-def llm(func):
+def llm(func: Callable[Concatenate[Any, P], R]) -> Callable[Concatenate[Any, P], R]:
     """Marks a method as an LLM provider."""
-    func.is_llm = True
+    func.is_llm = True  # type: ignore
-    func = memoize(func)
+    return memoize(func)
-    return func
 
 
-def output_json(cls):
+def output_json(cls: type[R]) -> type[R]:
     """Marks a class as JSON output format."""
-    cls.is_output_json = True
+    cls.is_output_json = True  # type: ignore
     return cls
 
 
-def output_pydantic(cls):
+def output_pydantic(cls: type[R]) -> type[R]:
     """Marks a class as Pydantic output format."""
-    cls.is_output_pydantic = True
+    cls.is_output_pydantic = True  # type: ignore
     return cls
 
 
-def tool(func):
+def tool(func: Callable[Concatenate[Any, P], R]) -> Callable[Concatenate[Any, P], R]:
     """Marks a method as a crew tool."""
-    func.is_tool = True
+    func.is_tool = True  # type: ignore
     return memoize(func)
 
 
-def callback(func):
+def callback(
+    func: Callable[Concatenate[Any, P], R],
+) -> Callable[Concatenate[Any, P], R]:
     """Marks a method as a crew callback."""
-    func.is_callback = True
+    func.is_callback = True  # type: ignore
     return memoize(func)
 
 
-def cache_handler(func):
+def cache_handler(
+    func: Callable[Concatenate[Any, P], R],
+) -> Callable[Concatenate[Any, P], R]:
     """Marks a method as a cache handler."""
-    func.is_cache_handler = True
+    func.is_cache_handler = True  # type: ignore
     return memoize(func)
 
 
-def crew(func) -> Callable[..., Crew]:
+def crew(
+    func: Callable[Concatenate[Any, P], Crew],
+) -> Callable[Concatenate[Any, P], Crew]:
     """Marks a method as the main crew execution point."""
 
     @wraps(func)
-    def wrapper(self, *args, **kwargs) -> Crew:
+    def wrapper(self: Any, *args: P.args, **kwargs: P.kwargs) -> Crew:
         instantiated_tasks = []
         instantiated_agents = []
         agent_roles = set()
@@ -91,7 +99,7 @@ def crew(func) -> Callable[..., Crew]:
         agents = self._original_agents.items()
 
         # Instantiate tasks in order
-        for task_name, task_method in tasks:
+        for _task_name, task_method in tasks:
             task_instance = task_method(self)
             instantiated_tasks.append(task_instance)
             agent_instance = getattr(task_instance, "agent", None)
@@ -100,7 +108,7 @@ def crew(func) -> Callable[..., Crew]:
                 agent_roles.add(agent_instance.role)
 
         # Instantiate agents not included by tasks
-        for agent_name, agent_method in agents:
+        for _agent_name, agent_method in agents:
             agent_instance = agent_method(self)
             if agent_instance.role not in agent_roles:
                 instantiated_agents.append(agent_instance)
@@ -109,19 +117,23 @@ def crew(func) -> Callable[..., Crew]:
         self.agents = instantiated_agents
         self.tasks = instantiated_tasks
 
-        crew = func(self, *args, **kwargs)
+        crew_result = func(self, *args, **kwargs)
 
-        def callback_wrapper(callback, instance):
+        def callback_wrapper(callback_func: Any, instance: Any) -> Callable[..., Any]:
-            def wrapper(*args, **kwargs):
+            def inner_wrapper(*cb_args: Any, **cb_kwargs: Any) -> Any:
-                return callback(instance, *args, **kwargs)
+                return callback_func(instance, *cb_args, **cb_kwargs)
 
-            return wrapper
+            return inner_wrapper
 
-        for _, callback in self._before_kickoff.items():
+        for callback_func in self._before_kickoff.values():
-            crew.before_kickoff_callbacks.append(callback_wrapper(callback, self))
+            crew_result.before_kickoff_callbacks.append(
-        for _, callback in self._after_kickoff.items():
+                callback_wrapper(callback_func, self)
-            crew.after_kickoff_callbacks.append(callback_wrapper(callback, self))
+            )
+        for callback_func in self._after_kickoff.values():
+            crew_result.after_kickoff_callbacks.append(
+                callback_wrapper(callback_func, self)
+            )
 
-        return crew
+        return crew_result
 
     return memoize(wrapper)

src/crewai/project/utils.py

@@ -1,11 +1,25 @@
+from collections.abc import Callable
 from functools import wraps
+from typing import ParamSpec, TypeVar
+
+P = ParamSpec("P")
+R = TypeVar("R")
 
 
-def memoize(func):
+def memoize(func: Callable[P, R]) -> Callable[P, R]:
-    cache = {}
+    """Decorator that caches function results based on arguments.
+
+    Args:
+        func: The function to memoize.
+
+    Returns:
+        The memoized function.
+    """
+    cache: dict[tuple, R] = {}
 
     @wraps(func)
-    def memoized_func(*args, **kwargs):
+    def memoized_func(*args: P.args, **kwargs: P.kwargs) -> R:
+        """Memoized wrapper function."""
         key = (args, tuple(kwargs.items()))
         if key not in cache:
             cache[key] = func(*args, **kwargs)