fix: add idx for task ordering, tests

lib/crewai/src/crewai/crew.py

@@ -327,7 +327,7 @@ class Crew(FlowTrackable, BaseModel):
     def set_private_attrs(self) -> Crew:
         """set private attributes."""
         self._cache_handler = CacheHandler()
-        event_listener = EventListener()  # type: ignore[no-untyped-call]
+        event_listener = EventListener()
 
         # Determine and set tracing state once for this execution
         tracing_enabled = should_enable_tracing(override=self.tracing)
@@ -955,10 +955,20 @@ class Crew(FlowTrackable, BaseModel):
             tasks=self.tasks, planning_agent_llm=self.planning_llm
         )._handle_crew_planning()
 
-        for task, step_plan in zip(
-            self.tasks, result.list_of_plans_per_task, strict=False
-        ):
-            task.description += step_plan.plan
+        plan_map: dict[int, str] = {
+            step_plan.task_number: step_plan.plan
+            for step_plan in result.list_of_plans_per_task
+        }
+
+        for idx, task in enumerate(self.tasks):
+            task_number = idx + 1
+            if task_number in plan_map:
+                task.description += plan_map[task_number]
+            else:
+                self._logger.log(
+                    "warning",
+                    f"No plan found for Task Number {task_number}",
+                )
 
     def _store_execution_log(
         self,

lib/crewai/src/crewai/utilities/planning_handler.py

@@ -15,9 +15,12 @@ logger = logging.getLogger(__name__)
 class PlanPerTask(BaseModel):
     """Represents a plan for a specific task."""
 
-    task: str = Field(..., description="The task for which the plan is created")
+    task_number: int = Field(
+        description="The 1-indexed task number this plan corresponds to",
+        ge=1,
+    )
+    task: str = Field(description="The task for which the plan is created")
     plan: str = Field(
-        ...,
         description="The step by step plan on how the agents can execute their tasks using the available tools with mastery",
     )