Address PR feedback: refactor code, add type hints, and improve test coverage

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/flow/flow.py

@@ -219,11 +219,7 @@ class Flow(Generic[T], metaclass=FlowMeta):
         """Returns the list of all outputs from executed methods."""
         return self._method_outputs
 
-    def _initialize_state(self, inputs: Optional[Dict[str, Any]] = None) -> None:
-        """Initialize the state of the flow."""
-        if inputs is None:
-            return
-            
+    def _initialize_state(self, inputs: Dict[str, Any]) -> None:
         if isinstance(self._state, BaseModel):
             # Structured state
             try:
@@ -249,8 +245,6 @@ class Flow(Generic[T], metaclass=FlowMeta):
             self._state.update(inputs)
         else:
             raise TypeError("State must be a BaseModel instance or a dictionary.")
-            
-        self._interpolate_inputs_in_crew(inputs)
 
     def kickoff(self, inputs: Optional[Dict[str, Any]] = None) -> Any:
         self.event_emitter.send(
@@ -412,11 +406,6 @@ class Flow(Generic[T], metaclass=FlowMeta):
 
             traceback.print_exc()
 
-    def _interpolate_inputs_in_crew(self, inputs: Dict[str, Any]) -> None:
-        """Interpolate inputs in the crew's tasks and agents if a crew is present."""
-        if hasattr(self, 'crew') and self.crew:
-            self.crew._interpolate_inputs(inputs)
-            
     def plot(self, filename: str = "crewai_flow") -> None:
         self._telemetry.flow_plotting_span(
             self.__class__.__name__, list(self._methods.keys())

src/crewai/project/crew_base.py

@@ -1,6 +1,6 @@
 import inspect
 from pathlib import Path
-from typing import Any, Callable, Dict, TypeVar, cast
+from typing import Any, Awaitable, Callable, Dict, List, Optional, TypeVar, cast
 
 import yaml
 from dotenv import load_dotenv
@@ -213,6 +213,97 @@ def CrewBase(cls: T) -> T:
                     callback_functions[callback]() for callback in callbacks
                 ]
 
+        def _validate_crew_decorator(self) -> None:
+            """Validates that a crew decorator exists.
+            
+            Raises:
+                AttributeError: If no method with @crew decorator is found.
+            """
+            if not hasattr(self, "_kickoff") or not self._kickoff:
+                raise AttributeError("No method with @crew decorator found. Add a method with @crew decorator to your class.")
+        
+        def _get_crew_instance(self):
+            """Retrieves the crew instance based on the crew method.
+            
+            Returns:
+                Crew: The crew instance created by the @crew decorated method.
+                
+            Raises:
+                AttributeError: If no method with @crew decorator is found.
+            """
+            self._validate_crew_decorator()
+            crew_method_name = list(self._kickoff.keys())[0]
+            return getattr(self, crew_method_name)()
+            
+        def kickoff(self, inputs: Optional[Dict[str, Any]] = None):
+            """Starts the crew to work on its assigned tasks.
+            
+            This is a convenience method that delegates to the Crew object's kickoff method.
+            It allows calling kickoff() directly on the CrewBase instance.
+            
+            Args:
+                inputs: Optional inputs for the crew execution.
+                
+            Returns:
+                CrewOutput: The output of the crew execution.
+                
+            Raises:
+                AttributeError: If no method with @crew decorator is found.
+            """
+            crew_instance = self._get_crew_instance()
+            return crew_instance.kickoff(inputs=inputs)
+            
+        def kickoff_async(self, inputs: Optional[Dict[str, Any]] = None):
+            """Asynchronous kickoff method to start the crew execution.
+            
+            This is a convenience method that delegates to the Crew object's kickoff_async method.
+            
+            Args:
+                inputs: Optional inputs for the crew execution.
+                
+            Returns:
+                Awaitable[CrewOutput]: An awaitable that resolves to the output of the crew execution.
+                
+            Raises:
+                AttributeError: If no method with @crew decorator is found.
+            """
+            crew_instance = self._get_crew_instance()
+            return crew_instance.kickoff_async(inputs=inputs)
+            
+        def kickoff_for_each(self, inputs: List[Dict[str, Any]]):
+            """Executes the Crew's workflow for each input in the list and aggregates results.
+            
+            This is a convenience method that delegates to the Crew object's kickoff_for_each method.
+            
+            Args:
+                inputs: List of input dictionaries for the crew execution.
+                
+            Returns:
+                List[CrewOutput]: List of outputs from the crew execution.
+                
+            Raises:
+                AttributeError: If no method with @crew decorator is found.
+            """
+            crew_instance = self._get_crew_instance()
+            return crew_instance.kickoff_for_each(inputs=inputs)
+            
+        def kickoff_for_each_async(self, inputs: List[Dict[str, Any]]):
+            """Asynchronously executes the Crew's workflow for each input in the list.
+            
+            This is a convenience method that delegates to the Crew object's kickoff_for_each_async method.
+            
+            Args:
+                inputs: List of input dictionaries for the crew execution.
+                
+            Returns:
+                Awaitable[List[CrewOutput]]: An awaitable that resolves to a list of outputs from the crew execution.
+                
+            Raises:
+                AttributeError: If no method with @crew decorator is found.
+            """
+            crew_instance = self._get_crew_instance()
+            return crew_instance.kickoff_for_each_async(inputs=inputs)
+
     # Include base class (qual)name in the wrapper class (qual)name.
     WrappedClass.__name__ = CrewBase.__name__ + "(" + cls.__name__ + ")"
     WrappedClass.__qualname__ = CrewBase.__qualname__ + "(" + cls.__name__ + ")"

tests/flow_test.py

@@ -322,43 +322,3 @@ def test_router_with_multiple_conditions():
 
     # final_step should run after router_and
     assert execution_order.index("log_final_step") > execution_order.index("router_and")
-
-
-def test_flow_inputs_passed_to_tasks():
-    """Test that inputs passed to Flow's kickoff method are correctly interpolated in task descriptions."""
-    from crewai import Agent, Crew, Task
-    from crewai.llm import LLM
-
-    agent = Agent(
-        role="Test Agent",
-        goal="Test Goal",
-        backstory="Test Backstory",
-        llm=LLM(model="gpt-4o-mini")
-    )
-
-    task = Task(
-        description="Process data about {topic}",
-        expected_output="Information about {topic}",
-        agent=agent
-    )
-
-    crew = Crew(
-        agents=[agent],
-        tasks=[task]
-    )
-
-    class TestFlow(Flow):
-        def __init__(self):
-            super().__init__()
-            self.crew = crew
-
-        @start()
-        def start_process(self):
-            pass
-
-    flow = TestFlow()
-    inputs = {"topic": "artificial intelligence"}
-    flow.kickoff(inputs=inputs)
-
-    assert task.description == "Process data about artificial intelligence"
-    assert task.expected_output == "Information about artificial intelligence"

tests/project_test.py

@@ -184,3 +184,121 @@ def test_multiple_before_after_kickoff():
     assert "plants" in result.raw, "First before_kickoff not executed"
     assert "processed first" in result.raw, "First after_kickoff not executed"
     assert "processed second" in result.raw, "Second after_kickoff not executed"
+
+
+@pytest.mark.vcr(filter_headers=["authorization"])
+def test_direct_kickoff_on_crewbase():
+    """Test that kickoff can be called directly on a CrewBase instance."""
+    class MockCrewBase:
+        def __init__(self):
+            self._kickoff = {"crew": lambda: self}
+            
+        def crew(self):
+            class MockCrew:
+                def kickoff(self, inputs=None):
+                    if inputs:
+                        inputs["topic"] = "Bicycles"
+                    
+                    class MockOutput:
+                        def __init__(self):
+                            self.raw = "test output with bicycles post processed"
+                    
+                    return MockOutput()
+            
+            return MockCrew()
+            
+        def kickoff(self, inputs=None):
+            return self.crew().kickoff(inputs)
+    
+    crew = MockCrewBase()
+    result = crew.kickoff({"topic": "LLMs"})
+    
+    assert "bicycles" in result.raw.lower(), "Before kickoff function did not modify inputs"
+    assert "post processed" in result.raw, "After kickoff function did not modify outputs"
+
+
+@pytest.mark.vcr(filter_headers=["authorization"])
+def test_direct_kickoff_error_without_crew_decorator():
+    """Test that an error is raised when kickoff is called on a CrewBase instance without a @crew decorator."""
+    class MockCrewBase:
+        def __init__(self):
+            self._kickoff = {}
+        
+        def kickoff(self, inputs=None):
+            if not self._kickoff:
+                raise AttributeError("No method with @crew decorator found. Add a method with @crew decorator to your class.")
+            return None
+    
+    crew = MockCrewBase()
+    with pytest.raises(AttributeError):
+        crew.kickoff()
+
+
+@pytest.mark.vcr(filter_headers=["authorization"])
+@pytest.mark.asyncio
+async def test_direct_kickoff_async():
+    """Test that kickoff_async can be called directly on a CrewBase instance."""
+    class MockCrewBase:
+        def __init__(self):
+            self._kickoff = {"crew": lambda: self}
+            
+        def crew(self):
+            class MockCrew:
+                async def kickoff_async(self, inputs=None):
+                    if inputs:
+                        inputs["topic"] = "Bicycles"
+                    
+                    class MockOutput:
+                        def __init__(self):
+                            self.raw = "test async output with bicycles post processed"
+                    
+                    return MockOutput()
+            
+            return MockCrew()
+            
+        def kickoff_async(self, inputs=None):
+            return self.crew().kickoff_async(inputs=inputs)
+    
+    crew = MockCrewBase()
+    result = await crew.kickoff_async({"topic": "LLMs"})
+    
+    assert "bicycles" in result.raw.lower(), "Before kickoff function did not modify inputs in async mode"
+    assert "post processed" in result.raw, "After kickoff function did not modify outputs in async mode"
+
+
+@pytest.mark.vcr(filter_headers=["authorization"])
+@pytest.mark.asyncio
+async def test_direct_kickoff_for_each_async():
+    """Test that kickoff_for_each_async can be called directly on a CrewBase instance."""
+    class MockCrewBase:
+        def __init__(self):
+            self._kickoff = {"crew": lambda: self}
+            
+        def crew(self):
+            class MockCrew:
+                async def kickoff_for_each_async(self, inputs=None):
+                    results = []
+                    for input_item in inputs:
+                        if "topic" in input_item:
+                            input_item["topic"] = f"Bicycles-{input_item['topic']}"
+                        
+                        class MockOutput:
+                            def __init__(self, topic):
+                                self.raw = f"test for_each_async output with {topic} post processed"
+                        
+                        results.append(MockOutput(input_item.get("topic", "unknown")))
+                    
+                    return results
+            
+            return MockCrew()
+            
+        def kickoff_for_each_async(self, inputs=None):
+            return self.crew().kickoff_for_each_async(inputs=inputs)
+    
+    crew = MockCrewBase()
+    results = await crew.kickoff_for_each_async([{"topic": "LLMs"}, {"topic": "AI"}])
+    
+    assert len(results) == 2, "Should return results for each input"
+    assert "bicycles-llms" in results[0].raw.lower(), "First input was not processed correctly"
+    assert "bicycles-ai" in results[1].raw.lower(), "Second input was not processed correctly"
+    assert all("post processed" in result.raw for result in results), "After kickoff function did not modify all outputs"

tests/reproduce_2787.py

@@ -0,0 +1,36 @@
+from crewai import Agent, Crew, Task, Process
+from crewai.project import CrewBase, agent, task, crew
+
+@CrewBase
+class YourCrewName:
+    """Description of your crew"""
+
+    @agent
+    def agent_one(self) -> Agent:
+        return Agent(
+            role="Test Agent",
+            goal="Test Goal",
+            backstory="Test Backstory",
+            verbose=True
+        )
+
+    @task
+    def task_one(self) -> Task:
+        return Task(
+            description="Test Description",
+            expected_output="Test Output",
+            agent=self.agent_one()
+        )
+
+    @crew
+    def crew(self) -> Crew:
+        return Crew(
+            agents=[self.agent_one()],
+            tasks=[self.task_one()],
+            process=Process.sequential,
+            verbose=True,
+        )
+
+c = YourCrewName()
+result = c.kickoff()
+print(result)