Supporting eval single Agent/LiteAgent (#3167)

* refactor: rely on task completion event to evaluate agents

* feat: remove Crew dependency to evaluate agent

* feat: drop execution_context in AgentEvaluator

* chore: drop experimental Agent Eval feature from stable crew.test

* feat: support eval LiteAgent

* resolve linter issues

src/crewai/experimental/evaluation/agent_evaluator.py

@@ -3,32 +3,32 @@ from crewai.agent import Agent
 from crewai.task import Task
 from crewai.experimental.evaluation.evaluation_display import EvaluationDisplayFormatter
 
-from typing import Any, Dict
-from collections import defaultdict
+from typing import Any
 from crewai.experimental.evaluation import BaseEvaluator, create_evaluation_callbacks
 from collections.abc import Sequence
-from crewai.crew import Crew
 from crewai.utilities.events.crewai_event_bus import crewai_event_bus
 from crewai.utilities.events.utils.console_formatter import ConsoleFormatter
-from crewai.experimental.evaluation.evaluation_display import AgentAggregatedEvaluationResult
-from contextlib import contextmanager
+from crewai.utilities.events.task_events import TaskCompletedEvent
+from crewai.utilities.events.agent_events import LiteAgentExecutionCompletedEvent
+from crewai.experimental.evaluation.base_evaluator import AgentAggregatedEvaluationResult
 import threading
 
 class ExecutionState:
     def __init__(self):
-        self.traces: dict[str, Any] = {}
-        self.current_agent_id: str | None = None
-        self.current_task_id: str | None = None
-        self.iteration: int = 1
-        self.iterations_results: dict[int, dict[str, list[AgentEvaluationResult]]] = {}
+        self.traces = {}
+        self.current_agent_id = None
+        self.current_task_id = None
+        self.iteration = 1
+        self.iterations_results = {}
+        self.agent_evaluators = {}
 
 class AgentEvaluator:
     def __init__(
         self,
+        agents: list[Agent],
         evaluators: Sequence[BaseEvaluator] | None = None,
-        crew: Crew | None = None,
     ):
-        self.crew: Crew | None = crew
+        self.agents: list[Agent] = agents
         self.evaluators: Sequence[BaseEvaluator] | None = evaluators
 
         self.callback = create_evaluation_callbacks()
@@ -37,19 +37,10 @@ class AgentEvaluator:
 
         self._thread_local: threading.local = threading.local()
 
-        self.agent_evaluators: dict[str, Sequence[BaseEvaluator] | None] = {}
-        if crew is not None:
-            assert crew and crew.agents is not None
-            for agent in crew.agents:
-                self.agent_evaluators[str(agent.id)] = self.evaluators
+        for agent in self.agents:
+            self._execution_state.agent_evaluators[str(agent.id)] = self.evaluators
 
-    @contextmanager
-    def execution_context(self):
-        state = ExecutionState()
-        try:
-            yield state
-        finally:
-            pass
+        self._subscribe_to_events()
 
     @property
     def _execution_state(self) -> ExecutionState:
@@ -57,81 +48,95 @@ class AgentEvaluator:
             self._thread_local.execution_state = ExecutionState()
         return self._thread_local.execution_state
 
+    def _subscribe_to_events(self) -> None:
+        crewai_event_bus.register_handler(TaskCompletedEvent, self._handle_task_completed)
+        crewai_event_bus.register_handler(LiteAgentExecutionCompletedEvent, self._handle_lite_agent_completed)
+
+    def _handle_task_completed(self, source: Any, event: TaskCompletedEvent) -> None:
+        assert event.task is not None
+        agent = event.task.agent
+        if agent and str(getattr(agent, 'id', 'unknown')) in self._execution_state.agent_evaluators:
+            state = ExecutionState()
+            state.current_agent_id = str(agent.id)
+            state.current_task_id = str(event.task.id)
+
+            trace = self.callback.get_trace(state.current_agent_id, state.current_task_id)
+
+            if not trace:
+                return
+
+            result = self.evaluate(
+                agent=agent,
+                task=event.task,
+                execution_trace=trace,
+                final_output=event.output,
+                state=state
+            )
+
+            current_iteration = self._execution_state.iteration
+            if current_iteration not in self._execution_state.iterations_results:
+                self._execution_state.iterations_results[current_iteration] = {}
+
+            if agent.role not in self._execution_state.iterations_results[current_iteration]:
+                self._execution_state.iterations_results[current_iteration][agent.role] = []
+
+            self._execution_state.iterations_results[current_iteration][agent.role].append(result)
+
+    def _handle_lite_agent_completed(self, source: object, event: LiteAgentExecutionCompletedEvent) -> None:
+        agent_info = event.agent_info
+        agent_id = str(agent_info["id"])
+
+        if agent_id in self._execution_state.agent_evaluators:
+            state = ExecutionState()
+            state.current_agent_id = agent_id
+            state.current_task_id = "lite_task"
+
+            target_agent = None
+            for agent in self.agents:
+                if str(agent.id) == agent_id:
+                    target_agent = agent
+                    break
+
+            if not target_agent:
+                return
+
+            trace = self.callback.get_trace(state.current_agent_id, state.current_task_id)
+
+            if not trace:
+                return
+
+            result = self.evaluate(
+                agent=target_agent,
+                execution_trace=trace,
+                final_output=event.output,
+                state=state
+            )
+
+            current_iteration = self._execution_state.iteration
+            if current_iteration not in self._execution_state.iterations_results:
+                self._execution_state.iterations_results[current_iteration] = {}
+
+            agent_role = target_agent.role
+            if agent_role not in self._execution_state.iterations_results[current_iteration]:
+                self._execution_state.iterations_results[current_iteration][agent_role] = []
+
+            self._execution_state.iterations_results[current_iteration][agent_role].append(result)
+
     def set_iteration(self, iteration: int) -> None:
         self._execution_state.iteration = iteration
 
     def reset_iterations_results(self) -> None:
         self._execution_state.iterations_results = {}
 
-    def evaluate_current_iteration(self) -> dict[str, list[AgentEvaluationResult]]:
-        if not self.crew:
-            raise ValueError("Cannot evaluate: no crew was provided to the evaluator.")
-
-        if not self.callback:
-            raise ValueError("Cannot evaluate: no callback was set. Use set_callback() method first.")
-
-        from rich.progress import Progress, SpinnerColumn, TextColumn, BarColumn
-        evaluation_results: defaultdict[str, list[AgentEvaluationResult]] = defaultdict(list)
-
-        total_evals = 0
-        for agent in self.crew.agents:
-            for task in self.crew.tasks:
-                if task.agent and task.agent.id == agent.id and self.agent_evaluators.get(str(agent.id)):
-                    total_evals += 1
-
-        with Progress(
-            SpinnerColumn(),
-            TextColumn("[bold blue]{task.description}[/bold blue]"),
-            BarColumn(),
-            TextColumn("{task.percentage:.0f}% completed"),
-            console=self.console_formatter.console
-        ) as progress:
-            eval_task = progress.add_task(f"Evaluating agents (iteration {self._execution_state.iteration})...", total=total_evals)
-
-            with self.execution_context() as state:
-                state.iteration = self._execution_state.iteration
-
-                for agent in self.crew.agents:
-                    evaluator = self.agent_evaluators.get(str(agent.id))
-                    if not evaluator:
-                        continue
-
-                    for task in self.crew.tasks:
-                        if task.agent and str(task.agent.id) != str(agent.id):
-                            continue
-
-                        trace = self.callback.get_trace(str(agent.id), str(task.id))
-                        if not trace:
-                            self.console_formatter.print(f"[yellow]Warning: No trace found for agent {agent.role} on task {task.description[:30]}...[/yellow]")
-                            progress.update(eval_task, advance=1)
-                            continue
-
-                        state.current_agent_id = str(agent.id)
-                        state.current_task_id = str(task.id)
-
-                        with crewai_event_bus.scoped_handlers():
-                            result = self.evaluate(
-                                agent=agent,
-                                task=task,
-                                execution_trace=trace,
-                                final_output=task.output,
-                                state=state
-                            )
-                            evaluation_results[agent.role].append(result)
-                            progress.update(eval_task, advance=1)
-
-        self._execution_state.iterations_results[self._execution_state.iteration] = evaluation_results
-        return evaluation_results
-
     def get_evaluation_results(self) -> dict[str, list[AgentEvaluationResult]]:
-        if self._execution_state.iteration in self._execution_state.iterations_results:
+        if self._execution_state.iterations_results and self._execution_state.iteration in self._execution_state.iterations_results:
             return self._execution_state.iterations_results[self._execution_state.iteration]
-        return self.evaluate_current_iteration()
+        return {}
 
     def display_results_with_iterations(self) -> None:
         self.display_formatter.display_summary_results(self._execution_state.iterations_results)
 
-    def get_agent_evaluation(self, strategy: AggregationStrategy = AggregationStrategy.SIMPLE_AVERAGE, include_evaluation_feedback: bool = False) -> Dict[str, AgentAggregatedEvaluationResult]:
+    def get_agent_evaluation(self, strategy: AggregationStrategy = AggregationStrategy.SIMPLE_AVERAGE, include_evaluation_feedback: bool = True) -> dict[str, AgentAggregatedEvaluationResult]:
         agent_results = {}
         with crewai_event_bus.scoped_handlers():
             task_results = self.get_evaluation_results()
@@ -165,14 +170,14 @@ class AgentEvaluator:
     def evaluate(
         self,
         agent: Agent,
-        task: Task,
         execution_trace: dict[str, Any],
         final_output: Any,
-        state: ExecutionState
+        state: ExecutionState,
+        task: Task | None = None,
     ) -> AgentEvaluationResult:
         result = AgentEvaluationResult(
             agent_id=state.current_agent_id or str(agent.id),
-            task_id=state.current_task_id or str(task.id)
+            task_id=state.current_task_id or (str(task.id) if task else "unknown_task")
         )
 
         assert self.evaluators is not None
@@ -190,7 +195,7 @@ class AgentEvaluator:
 
         return result
 
-def create_default_evaluator(crew, llm=None):
+def create_default_evaluator(agents: list[Agent], llm: None = None):
     from crewai.experimental.evaluation import (
         GoalAlignmentEvaluator,
         SemanticQualityEvaluator,
@@ -209,4 +214,4 @@ def create_default_evaluator(crew, llm=None):
         ReasoningEfficiencyEvaluator(llm=llm),
     ]
 
-    return AgentEvaluator(evaluators=evaluators, crew=crew)
+    return AgentEvaluator(evaluators=evaluators, agents=agents)

src/crewai/experimental/evaluation/base_evaluator.py

@@ -57,9 +57,9 @@ class BaseEvaluator(abc.ABC):
     def evaluate(
         self,
         agent: Agent,
-        task: Task,
         execution_trace: Dict[str, Any],
         final_output: Any,
+        task: Task | None = None,
     ) -> EvaluationScore:
         pass
 

src/crewai/experimental/evaluation/evaluation_listener.py

@@ -9,7 +9,9 @@ from crewai.utilities.events.base_event_listener import BaseEventListener
 from crewai.utilities.events.crewai_event_bus import CrewAIEventsBus
 from crewai.utilities.events.agent_events import (
     AgentExecutionStartedEvent,
-    AgentExecutionCompletedEvent
+    AgentExecutionCompletedEvent,
+    LiteAgentExecutionStartedEvent,
+    LiteAgentExecutionCompletedEvent
 )
 from crewai.utilities.events.tool_usage_events import (
     ToolUsageFinishedEvent,
@@ -52,10 +54,18 @@ class EvaluationTraceCallback(BaseEventListener):
         def on_agent_started(source, event: AgentExecutionStartedEvent):
             self.on_agent_start(event.agent, event.task)
 
+        @event_bus.on(LiteAgentExecutionStartedEvent)
+        def on_lite_agent_started(source, event: LiteAgentExecutionStartedEvent):
+            self.on_lite_agent_start(event.agent_info)
+
         @event_bus.on(AgentExecutionCompletedEvent)
         def on_agent_completed(source, event: AgentExecutionCompletedEvent):
             self.on_agent_finish(event.agent, event.task, event.output)
 
+        @event_bus.on(LiteAgentExecutionCompletedEvent)
+        def on_lite_agent_completed(source, event: LiteAgentExecutionCompletedEvent):
+            self.on_lite_agent_finish(event.output)
+
         @event_bus.on(ToolUsageFinishedEvent)
         def on_tool_completed(source, event: ToolUsageFinishedEvent):
             self.on_tool_use(event.tool_name, event.tool_args, event.output, success=True)
@@ -88,19 +98,38 @@ class EvaluationTraceCallback(BaseEventListener):
         def on_llm_call_completed(source, event: LLMCallCompletedEvent):
             self.on_llm_call_end(event.messages, event.response)
 
+    def on_lite_agent_start(self, agent_info: dict[str, Any]):
+        self.current_agent_id = agent_info['id']
+        self.current_task_id = "lite_task"
+
+        trace_key = f"{self.current_agent_id}_{self.current_task_id}"
+        self._init_trace(
+            trace_key=trace_key,
+            agent_id=self.current_agent_id,
+            task_id=self.current_task_id,
+            tool_uses=[],
+            llm_calls=[],
+            start_time=datetime.now(),
+            final_output=None
+        )
+
+    def _init_trace(self, trace_key: str, **kwargs: Any):
+        self.traces[trace_key] = kwargs
+
     def on_agent_start(self, agent: Agent, task: Task):
         self.current_agent_id = agent.id
         self.current_task_id = task.id
 
         trace_key = f"{agent.id}_{task.id}"
-        self.traces[trace_key] = {
-            "agent_id": agent.id,
-            "task_id": task.id,
-            "tool_uses": [],
-            "llm_calls": [],
-            "start_time": datetime.now(),
-            "final_output": None
-        }
+        self._init_trace(
+            trace_key=trace_key,
+            agent_id=agent.id,
+            task_id=task.id,
+            tool_uses=[],
+            llm_calls=[],
+            start_time=datetime.now(),
+            final_output=None
+        )
 
     def on_agent_finish(self, agent: Agent, task: Task, output: Any):
         trace_key = f"{agent.id}_{task.id}"
@@ -108,9 +137,20 @@ class EvaluationTraceCallback(BaseEventListener):
             self.traces[trace_key]["final_output"] = output
             self.traces[trace_key]["end_time"] = datetime.now()
 
+        self._reset_current()
+
+    def _reset_current(self):
         self.current_agent_id = None
         self.current_task_id = None
 
+    def on_lite_agent_finish(self, output: Any):
+        trace_key = f"{self.current_agent_id}_lite_task"
+        if trace_key in self.traces:
+            self.traces[trace_key]["final_output"] = output
+            self.traces[trace_key]["end_time"] = datetime.now()
+
+        self._reset_current()
+
     def on_tool_use(self, tool_name: str, tool_args: dict[str, Any] | str, result: Any,
                    success: bool = True, error_type: str | None = None):
         if not self.current_agent_id or not self.current_task_id:

src/crewai/experimental/evaluation/experiment/runner.py

@@ -2,7 +2,7 @@ from collections import defaultdict
 from hashlib import md5
 from typing import Any
 
-from crewai import Crew
+from crewai import Crew, Agent
 from crewai.experimental.evaluation import AgentEvaluator, create_default_evaluator
 from crewai.experimental.evaluation.experiment.result_display import ExperimentResultsDisplay
 from crewai.experimental.evaluation.experiment.result import ExperimentResults, ExperimentResult
@@ -14,14 +14,18 @@ class ExperimentRunner:
         self.evaluator: AgentEvaluator | None = None
         self.display = ExperimentResultsDisplay()
 
-    def run(self, crew: Crew, print_summary: bool = False) -> ExperimentResults:
-        self.evaluator = create_default_evaluator(crew=crew)
+    def run(self, crew: Crew | None = None, agents: list[Agent] | None = None, print_summary: bool = False) -> ExperimentResults:
+        if crew and not agents:
+            agents = crew.agents
+
+        assert agents is not None
+        self.evaluator = create_default_evaluator(agents=agents)
 
         results = []
 
         for test_case in self.dataset:
             self.evaluator.reset_iterations_results()
-            result = self._run_test_case(test_case, crew)
+            result = self._run_test_case(test_case=test_case, crew=crew, agents=agents)
             results.append(result)
 
         experiment_results = ExperimentResults(results)
@@ -31,7 +35,7 @@ class ExperimentRunner:
 
         return experiment_results
 
-    def _run_test_case(self, test_case: dict[str, Any], crew: Crew) -> ExperimentResult:
+    def _run_test_case(self, test_case: dict[str, Any], agents: list[Agent], crew: Crew | None = None) -> ExperimentResult:
         inputs = test_case["inputs"]
         expected_score = test_case["expected_score"]
         identifier = test_case.get("identifier") or md5(str(test_case).encode(), usedforsecurity=False).hexdigest()
@@ -39,7 +43,11 @@ class ExperimentRunner:
         try:
             self.display.console.print(f"[dim]Running crew with input: {str(inputs)[:50]}...[/dim]")
             self.display.console.print("\n")
-            crew.kickoff(inputs=inputs)
+            if crew:
+                crew.kickoff(inputs=inputs)
+            else:
+                for agent in agents:
+                    agent.kickoff(**inputs)
 
             assert self.evaluator is not None
             agent_evaluations = self.evaluator.get_agent_evaluation()

src/crewai/experimental/evaluation/metrics/goal_metrics.py

@@ -14,10 +14,14 @@ class GoalAlignmentEvaluator(BaseEvaluator):
     def evaluate(
         self,
         agent: Agent,
-        task: Task,
         execution_trace: Dict[str, Any],
         final_output: Any,
+        task: Task | None = None,
     ) -> EvaluationScore:
+        task_context = ""
+        if task is not None:
+            task_context = f"Task description: {task.description}\nExpected output: {task.expected_output}\n"
+
         prompt = [
             {"role": "system", "content": """You are an expert evaluator assessing how well an AI agent's output aligns with its assigned task goal.
 
@@ -37,8 +41,7 @@ Return your evaluation as JSON with fields 'score' (number) and 'feedback' (stri
             {"role": "user", "content": f"""
 Agent role: {agent.role}
 Agent goal: {agent.goal}
-Task description: {task.description}
-Expected output: {task.expected_output}
+{task_context}
 
 Agent's final output:
 {final_output}

src/crewai/experimental/evaluation/metrics/reasoning_metrics.py

@@ -36,10 +36,14 @@ class ReasoningEfficiencyEvaluator(BaseEvaluator):
     def evaluate(
         self,
         agent: Agent,
-        task: Task,
         execution_trace: Dict[str, Any],
-        final_output: TaskOutput,
+        final_output: TaskOutput | str,
+        task: Task | None = None,
     ) -> EvaluationScore:
+        task_context = ""
+        if task is not None:
+            task_context = f"Task description: {task.description}\nExpected output: {task.expected_output}\n"
+
         llm_calls = execution_trace.get("llm_calls", [])
 
         if not llm_calls or len(llm_calls) < 2:
@@ -83,6 +87,8 @@ class ReasoningEfficiencyEvaluator(BaseEvaluator):
 
         call_samples = self._get_call_samples(llm_calls)
 
+        final_output = final_output.raw if isinstance(final_output, TaskOutput) else final_output
+
         prompt = [
             {"role": "system", "content": """You are an expert evaluator assessing the reasoning efficiency of an AI agent's thought process.
 
@@ -117,7 +123,7 @@ Return your evaluation as JSON with the following structure:
 }"""},
             {"role": "user", "content": f"""
 Agent role: {agent.role}
-Task description: {task.description}
+{task_context}
 
 Reasoning efficiency metrics:
 - Total LLM calls: {efficiency_metrics["total_llm_calls"]}
@@ -130,7 +136,7 @@ Sample of agent reasoning flow (chronological sequence):
 {call_samples}
 
 Agent's final output:
-{final_output.raw[:500]}... (truncated)
+{final_output[:500]}... (truncated)
 
 Evaluate the reasoning efficiency of this agent based on these interaction patterns.
 Identify any inefficient reasoning patterns and provide specific suggestions for optimization.

src/crewai/experimental/evaluation/metrics/semantic_quality_metrics.py

@@ -14,10 +14,13 @@ class SemanticQualityEvaluator(BaseEvaluator):
     def evaluate(
         self,
         agent: Agent,
-        task: Task,
         execution_trace: Dict[str, Any],
         final_output: Any,
+        task: Task | None = None,
     ) -> EvaluationScore:
+        task_context = ""
+        if task is not None:
+            task_context = f"Task description: {task.description}"
         prompt = [
             {"role": "system", "content": """You are an expert evaluator assessing the semantic quality of an AI agent's output.
 
@@ -37,7 +40,7 @@ Return your evaluation as JSON with fields 'score' (number) and 'feedback' (stri
 """},
             {"role": "user", "content": f"""
 Agent role: {agent.role}
-Task description: {task.description}
+{task_context}
 
 Agent's final output:
 {final_output}

src/crewai/experimental/evaluation/metrics/tools_metrics.py

@@ -16,10 +16,14 @@ class ToolSelectionEvaluator(BaseEvaluator):
     def evaluate(
         self,
         agent: Agent,
-        task: Task,
         execution_trace: Dict[str, Any],
         final_output: str,
+        task: Task | None = None,
     ) -> EvaluationScore:
+        task_context = ""
+        if task is not None:
+            task_context = f"Task description: {task.description}"
+
         tool_uses = execution_trace.get("tool_uses", [])
         tool_count = len(tool_uses)
         unique_tool_types = set([tool.get("tool", "Unknown tool") for tool in tool_uses])
@@ -72,7 +76,7 @@ Return your evaluation as JSON with these fields:
 """},
             {"role": "user", "content": f"""
 Agent role: {agent.role}
-Task description: {task.description}
+{task_context}
 
 Available tools for this agent:
 {available_tools_info}
@@ -128,10 +132,13 @@ class ParameterExtractionEvaluator(BaseEvaluator):
     def evaluate(
         self,
         agent: Agent,
-        task: Task,
         execution_trace: Dict[str, Any],
         final_output: str,
+        task: Task | None = None,
     ) -> EvaluationScore:
+        task_context = ""
+        if task is not None:
+            task_context = f"Task description: {task.description}"
         tool_uses = execution_trace.get("tool_uses", [])
         tool_count = len(tool_uses)
 
@@ -212,7 +219,7 @@ Return your evaluation as JSON with these fields:
 """},
             {"role": "user", "content": f"""
 Agent role: {agent.role}
-Task description: {task.description}
+{task_context}
 
 Parameter extraction examples:
 {param_samples_text}
@@ -267,10 +274,13 @@ class ToolInvocationEvaluator(BaseEvaluator):
     def evaluate(
         self,
         agent: Agent,
-        task: Task,
         execution_trace: Dict[str, Any],
         final_output: str,
+        task: Task | None = None,
     ) -> EvaluationScore:
+        task_context = ""
+        if task is not None:
+            task_context = f"Task description: {task.description}"
         tool_uses = execution_trace.get("tool_uses", [])
         tool_errors = []
         tool_count = len(tool_uses)
@@ -352,7 +362,7 @@ Return your evaluation as JSON with these fields:
 """},
             {"role": "user", "content": f"""
 Agent role: {agent.role}
-Task description: {task.description}
+{task_context}
 
 Tool invocation examples:
 {invocation_samples_text}

src/crewai/experimental/evaluation/testing.py

@@ -3,7 +3,7 @@ import inspect
 from typing_extensions import Any
 import warnings
 from crewai.experimental.evaluation.experiment import ExperimentResults, ExperimentRunner
-from crewai import Crew
+from crewai import Crew, Agent
 
 def assert_experiment_successfully(experiment_results: ExperimentResults, baseline_filepath: str | None = None) -> None:
     failed_tests = [result for result in experiment_results.results if not result.passed]
@@ -35,10 +35,10 @@ def assert_experiment_no_regression(comparison_result: dict[str, list[str]]) ->
             UserWarning
         )
 
-def run_experiment(dataset: list[dict[str, Any]], crew: Crew, verbose: bool = False) -> ExperimentResults:
+def run_experiment(dataset: list[dict[str, Any]], crew: Crew | None = None, agents: list[Agent] | None = None, verbose: bool = False) -> ExperimentResults:
     runner = ExperimentRunner(dataset=dataset)
 
-    return runner.run(crew=crew, print_summary=verbose)
+    return runner.run(agents=agents, crew=crew, print_summary=verbose)
 
 def _get_baseline_filepath_fallback() -> str:
     test_func_name = "experiment_fallback"