lint

- Remove `execution_span` from Task class
- Add `execution_spans` dictionary to EventListener to track spans
- Update task event handlers to use new span tracking mechanism
- Simplify span management across task lifecycle events

.gitignore

@@ -21,4 +21,5 @@ crew_tasks_output.json
 .mypy_cache
 .ruff_cache
 .venv
-agentops.log
+agentops.log
+test_flow.html

docs/how-to/langfuse-observability.mdx

@@ -10,6 +10,8 @@ This notebook demonstrates how to integrate **Langfuse** with **CrewAI** using O
 
 > **What is Langfuse?** [Langfuse](https://langfuse.com) is an open-source LLM engineering platform. It provides tracing and monitoring capabilities for LLM applications, helping developers debug, analyze, and optimize their AI systems. Langfuse integrates with various tools and frameworks via native integrations, OpenTelemetry, and APIs/SDKs.
 
+[![Langfuse Overview Video](https://github.com/user-attachments/assets/3926b288-ff61-4b95-8aa1-45d041c70866)](https://langfuse.com/watch-demo)
+
 ## Get Started
 
 We'll walk through a simple example of using CrewAI and integrating it with Langfuse via OpenTelemetry using OpenLit.

src/crewai/crew.py

@@ -35,7 +35,6 @@ from crewai.process import Process
 from crewai.task import Task
 from crewai.tasks.conditional_task import ConditionalTask
 from crewai.tasks.task_output import TaskOutput
-from crewai.telemetry import Telemetry
 from crewai.tools.agent_tools.agent_tools import AgentTools
 from crewai.tools.base_tool import Tool
 from crewai.traces.unified_trace_controller import init_crew_main_trace
@@ -258,8 +257,6 @@ class Crew(BaseModel):
         if self.function_calling_llm and not isinstance(self.function_calling_llm, LLM):
             self.function_calling_llm = create_llm(self.function_calling_llm)
 
-        self._telemetry = Telemetry()
-        self._telemetry.set_tracer()
         return self
 
     @model_validator(mode="after")
@@ -1115,7 +1112,6 @@ class Crew(BaseModel):
             "_short_term_memory",
             "_long_term_memory",
             "_entity_memory",
-            "_telemetry",
             "agents",
             "tasks",
             "knowledge_sources",
@@ -1278,11 +1274,11 @@ class Crew(BaseModel):
     def _reset_all_memories(self) -> None:
         """Reset all available memory systems."""
         memory_systems = [
-            ("short term", self._short_term_memory),
-            ("entity", self._entity_memory),
-            ("long term", self._long_term_memory),
-            ("task output", self._task_output_handler),
-            ("knowledge", self.knowledge),
+            ("short term", getattr(self, "_short_term_memory", None)),
+            ("entity", getattr(self, "_entity_memory", None)),
+            ("long term", getattr(self, "_long_term_memory", None)),
+            ("task output", getattr(self, "_task_output_handler", None)),
+            ("knowledge", getattr(self, "knowledge", None)),
         ]
 
         for name, system in memory_systems:

src/crewai/flow/flow.py

@@ -713,16 +713,35 @@ class Flow(Generic[T], metaclass=FlowMeta):
             raise TypeError(f"State must be dict or BaseModel, got {type(self._state)}")
 
     def kickoff(self, inputs: Optional[Dict[str, Any]] = None) -> Any:
-        """Start the flow execution.
+        """
+        Start the flow execution in a synchronous context.
+
+        This method wraps kickoff_async so that all state initialization and event
+        emission is handled in the asynchronous method.
+        """
+
+        async def run_flow():
+            return await self.kickoff_async(inputs)
+
+        return asyncio.run(run_flow())
+
+    @init_flow_main_trace
+    async def kickoff_async(self, inputs: Optional[Dict[str, Any]] = None) -> Any:
+        """
+        Start the flow execution asynchronously.
+
+        This method performs state restoration (if an 'id' is provided and persistence is available)
+        and updates the flow state with any additional inputs. It then emits the FlowStartedEvent,
+        logs the flow startup, and executes all start methods. Once completed, it emits the
+        FlowFinishedEvent and returns the final output.
 
         Args:
-            inputs: Optional dictionary containing input values and potentially a state ID to restore
-        """
-        # Handle state restoration if ID is provided in inputs
-        if inputs and "id" in inputs and self._persistence is not None:
-            restore_uuid = inputs["id"]
-            stored_state = self._persistence.load_state(restore_uuid)
+            inputs: Optional dictionary containing input values and/or a state ID for restoration.
 
+        Returns:
+            The final output from the flow, which is the result of the last executed method.
+        """
+        if inputs:
             # Override the id in the state if it exists in inputs
             if "id" in inputs:
                 if isinstance(self._state, dict):
@@ -730,24 +749,27 @@ class Flow(Generic[T], metaclass=FlowMeta):
                 elif isinstance(self._state, BaseModel):
                     setattr(self._state, "id", inputs["id"])
 
-            if stored_state:
-                self._log_flow_event(
-                    f"Loading flow state from memory for UUID: {restore_uuid}",
-                    color="yellow",
-                )
-                # Restore the state
-                self._restore_state(stored_state)
-            else:
-                self._log_flow_event(
-                    f"No flow state found for UUID: {restore_uuid}", color="red"
-                )
+            # If persistence is enabled, attempt to restore the stored state using the provided id.
+            if "id" in inputs and self._persistence is not None:
+                restore_uuid = inputs["id"]
+                stored_state = self._persistence.load_state(restore_uuid)
+                if stored_state:
+                    self._log_flow_event(
+                        f"Loading flow state from memory for UUID: {restore_uuid}",
+                        color="yellow",
+                    )
+                    self._restore_state(stored_state)
+                else:
+                    self._log_flow_event(
+                        f"No flow state found for UUID: {restore_uuid}", color="red"
+                    )
 
-            # Apply any additional inputs after restoration
+            # Update state with any additional inputs (ignoring the 'id' key)
             filtered_inputs = {k: v for k, v in inputs.items() if k != "id"}
             if filtered_inputs:
                 self._initialize_state(filtered_inputs)
 
-        # Start flow execution
+        # Emit FlowStartedEvent and log the start of the flow.
         crewai_event_bus.emit(
             self,
             FlowStartedEvent(
@@ -760,27 +782,18 @@ class Flow(Generic[T], metaclass=FlowMeta):
             f"Flow started with ID: {self.flow_id}", color="bold_magenta"
         )
 
-        if inputs is not None and "id" not in inputs:
-            self._initialize_state(inputs)
-
-        async def run_flow():
-            return await self.kickoff_async()
-
-        return asyncio.run(run_flow())
-
-    @init_flow_main_trace
-    async def kickoff_async(self, inputs: Optional[Dict[str, Any]] = None) -> Any:
         if not self._start_methods:
             raise ValueError("No start method defined")
 
+        # Execute all start methods concurrently.
         tasks = [
             self._execute_start_method(start_method)
             for start_method in self._start_methods
         ]
         await asyncio.gather(*tasks)
-
         final_output = self._method_outputs[-1] if self._method_outputs else None
 
+        # Emit FlowFinishedEvent after all processing is complete.
         crewai_event_bus.emit(
             self,
             FlowFinishedEvent(

src/crewai/llm.py

@@ -21,6 +21,12 @@ from typing import (
 from dotenv import load_dotenv
 from pydantic import BaseModel
 
+from crewai.utilities.events.llm_events import (
+    LLMCallCompletedEvent,
+    LLMCallFailedEvent,
+    LLMCallStartedEvent,
+    LLMCallType,
+)
 from crewai.utilities.events.tool_usage_events import ToolExecutionErrorEvent
 
 with warnings.catch_warnings():
@@ -259,6 +265,15 @@ class LLM:
             >>> print(response)
             "The capital of France is Paris."
         """
+        crewai_event_bus.emit(
+            self,
+            event=LLMCallStartedEvent(
+                messages=messages,
+                tools=tools,
+                callbacks=callbacks,
+                available_functions=available_functions,
+            ),
+        )
         # Validate parameters before proceeding with the call.
         self._validate_call_params()
 
@@ -333,12 +348,13 @@ class LLM:
 
                 # --- 4) If no tool calls, return the text response
                 if not tool_calls or not available_functions:
+                    self._handle_emit_call_events(text_response, LLMCallType.LLM_CALL)
                     return text_response
 
                 # --- 5) Handle the tool call
                 tool_call = tool_calls[0]
                 function_name = tool_call.function.name
-                print("function_name", function_name)
+
                 if function_name in available_functions:
                     try:
                         function_args = json.loads(tool_call.function.arguments)
@@ -350,6 +366,7 @@ class LLM:
                     try:
                         # Call the actual tool function
                         result = fn(**function_args)
+                        self._handle_emit_call_events(result, LLMCallType.TOOL_CALL)
                         return result
 
                     except Exception as e:
@@ -365,6 +382,12 @@ class LLM:
                                 error=str(e),
                             ),
                         )
+                        crewai_event_bus.emit(
+                            self,
+                            event=LLMCallFailedEvent(
+                                error=f"Tool execution error: {str(e)}"
+                            ),
+                        )
                         return text_response
 
                 else:
@@ -374,12 +397,28 @@ class LLM:
                     return text_response
 
             except Exception as e:
+                crewai_event_bus.emit(
+                    self,
+                    event=LLMCallFailedEvent(error=str(e)),
+                )
                 if not LLMContextLengthExceededException(
                     str(e)
                 )._is_context_limit_error(str(e)):
                     logging.error(f"LiteLLM call failed: {str(e)}")
                 raise
 
+    def _handle_emit_call_events(self, response: Any, call_type: LLMCallType):
+        """Handle the events for the LLM call.
+
+        Args:
+            response (str): The response from the LLM call.
+            call_type (str): The type of call, either "tool_call" or "llm_call".
+        """
+        crewai_event_bus.emit(
+            self,
+            event=LLMCallCompletedEvent(response=response, call_type=call_type),
+        )
+
     def _format_messages_for_provider(
         self, messages: List[Dict[str, str]]
     ) -> List[Dict[str, str]]:

src/crewai/utilities/events/__init__.py

@@ -34,6 +34,7 @@ from .tool_usage_events import (
     ToolUsageEvent,
     ToolValidateInputErrorEvent,
 )
+from .llm_events import LLMCallCompletedEvent, LLMCallFailedEvent, LLMCallStartedEvent
 
 # events
 from .event_listener import EventListener

src/crewai/utilities/events/event_listener.py

@@ -1,9 +1,17 @@
-from pydantic import PrivateAttr
+from typing import Any, Dict
 
+from pydantic import Field, PrivateAttr
+
+from crewai.task import Task
 from crewai.telemetry.telemetry import Telemetry
 from crewai.utilities import Logger
 from crewai.utilities.constants import EMITTER_COLOR
 from crewai.utilities.events.base_event_listener import BaseEventListener
+from crewai.utilities.events.llm_events import (
+    LLMCallCompletedEvent,
+    LLMCallFailedEvent,
+    LLMCallStartedEvent,
+)
 
 from .agent_events import AgentExecutionCompletedEvent, AgentExecutionStartedEvent
 from .crew_events import (
@@ -37,6 +45,7 @@ class EventListener(BaseEventListener):
     _instance = None
     _telemetry: Telemetry = PrivateAttr(default_factory=lambda: Telemetry())
     logger = Logger(verbose=True, default_color=EMITTER_COLOR)
+    execution_spans: Dict[Task, Any] = Field(default_factory=dict)
 
     def __new__(cls):
         if cls._instance is None:
@@ -49,6 +58,7 @@ class EventListener(BaseEventListener):
             super().__init__()
             self._telemetry = Telemetry()
             self._telemetry.set_tracer()
+            self.execution_spans = {}
             self._initialized = True
 
     # ----------- CREW EVENTS -----------
@@ -57,7 +67,7 @@ class EventListener(BaseEventListener):
         @crewai_event_bus.on(CrewKickoffStartedEvent)
         def on_crew_started(source, event: CrewKickoffStartedEvent):
             self.logger.log(
-                f"🚀 Crew '{event.crew_name}' started",
+                f"🚀 Crew '{event.crew_name}' started, {source.id}",
                 event.timestamp,
             )
             self._telemetry.crew_execution_span(source, event.inputs)
@@ -67,28 +77,28 @@ class EventListener(BaseEventListener):
             final_string_output = event.output.raw
             self._telemetry.end_crew(source, final_string_output)
             self.logger.log(
-                f"✅ Crew '{event.crew_name}' completed",
+                f"✅ Crew '{event.crew_name}' completed, {source.id}",
                 event.timestamp,
             )
 
         @crewai_event_bus.on(CrewKickoffFailedEvent)
         def on_crew_failed(source, event: CrewKickoffFailedEvent):
             self.logger.log(
-                f"❌ Crew '{event.crew_name}' failed",
+                f"❌ Crew '{event.crew_name}' failed, {source.id}",
                 event.timestamp,
             )
 
         @crewai_event_bus.on(CrewTestStartedEvent)
         def on_crew_test_started(source, event: CrewTestStartedEvent):
             cloned_crew = source.copy()
-            cloned_crew._telemetry.test_execution_span(
+            self._telemetry.test_execution_span(
                 cloned_crew,
                 event.n_iterations,
                 event.inputs,
-                event.eval_llm,
+                event.eval_llm or "",
             )
             self.logger.log(
-                f"🚀 Crew '{event.crew_name}' started test",
+                f"🚀 Crew '{event.crew_name}' started test, {source.id}",
                 event.timestamp,
             )
 
@@ -131,9 +141,9 @@ class EventListener(BaseEventListener):
 
         @crewai_event_bus.on(TaskStartedEvent)
         def on_task_started(source, event: TaskStartedEvent):
-            source._execution_span = self._telemetry.task_started(
-                crew=source.agent.crew, task=source
-            )
+            span = self._telemetry.task_started(crew=source.agent.crew, task=source)
+            self.execution_spans[source] = span
+
             self.logger.log(
                 f"📋 Task started: {source.description}",
                 event.timestamp,
@@ -141,24 +151,22 @@ class EventListener(BaseEventListener):
 
         @crewai_event_bus.on(TaskCompletedEvent)
         def on_task_completed(source, event: TaskCompletedEvent):
-            if source._execution_span:
-                self._telemetry.task_ended(
-                    source._execution_span, source, source.agent.crew
-                )
+            span = self.execution_spans.get(source)
+            if span:
+                self._telemetry.task_ended(span, source, source.agent.crew)
             self.logger.log(
                 f"✅ Task completed: {source.description}",
                 event.timestamp,
             )
-            source._execution_span = None
+            self.execution_spans[source] = None
 
         @crewai_event_bus.on(TaskFailedEvent)
         def on_task_failed(source, event: TaskFailedEvent):
-            if source._execution_span:
+            span = self.execution_spans.get(source)
+            if span:
                 if source.agent and source.agent.crew:
-                    self._telemetry.task_ended(
-                        source._execution_span, source, source.agent.crew
-                    )
-                source._execution_span = None
+                    self._telemetry.task_ended(span, source, source.agent.crew)
+                self.execution_spans[source] = None
             self.logger.log(
                 f"❌ Task failed: {source.description}",
                 event.timestamp,
@@ -184,7 +192,7 @@ class EventListener(BaseEventListener):
 
         @crewai_event_bus.on(FlowCreatedEvent)
         def on_flow_created(source, event: FlowCreatedEvent):
-            self._telemetry.flow_creation_span(self.__class__.__name__)
+            self._telemetry.flow_creation_span(event.flow_name)
             self.logger.log(
                 f"🌊 Flow Created: '{event.flow_name}'",
                 event.timestamp,
@@ -193,17 +201,17 @@ class EventListener(BaseEventListener):
         @crewai_event_bus.on(FlowStartedEvent)
         def on_flow_started(source, event: FlowStartedEvent):
             self._telemetry.flow_execution_span(
-                source.__class__.__name__, list(source._methods.keys())
+                event.flow_name, list(source._methods.keys())
             )
             self.logger.log(
-                f"🤖 Flow Started: '{event.flow_name}'",
+                f"🤖 Flow Started: '{event.flow_name}', {source.flow_id}",
                 event.timestamp,
             )
 
         @crewai_event_bus.on(FlowFinishedEvent)
         def on_flow_finished(source, event: FlowFinishedEvent):
             self.logger.log(
-                f"👍 Flow Finished: '{event.flow_name}'",
+                f"👍 Flow Finished: '{event.flow_name}', {source.flow_id}",
                 event.timestamp,
             )
 
@@ -253,5 +261,28 @@ class EventListener(BaseEventListener):
                 #
             )
 
+        # ----------- LLM EVENTS -----------
+
+        @crewai_event_bus.on(LLMCallStartedEvent)
+        def on_llm_call_started(source, event: LLMCallStartedEvent):
+            self.logger.log(
+                f"🤖 LLM Call Started",
+                event.timestamp,
+            )
+
+        @crewai_event_bus.on(LLMCallCompletedEvent)
+        def on_llm_call_completed(source, event: LLMCallCompletedEvent):
+            self.logger.log(
+                f"✅ LLM Call Completed",
+                event.timestamp,
+            )
+
+        @crewai_event_bus.on(LLMCallFailedEvent)
+        def on_llm_call_failed(source, event: LLMCallFailedEvent):
+            self.logger.log(
+                f"❌ LLM Call Failed: '{event.error}'",
+                event.timestamp,
+            )
+
 
 event_listener = EventListener()

src/crewai/utilities/events/llm_events.py

@@ -0,0 +1,36 @@
+from enum import Enum
+from typing import Any, Dict, List, Optional, Union
+
+from crewai.utilities.events.base_events import CrewEvent
+
+
+class LLMCallType(Enum):
+    """Type of LLM call being made"""
+
+    TOOL_CALL = "tool_call"
+    LLM_CALL = "llm_call"
+
+
+class LLMCallStartedEvent(CrewEvent):
+    """Event emitted when a LLM call starts"""
+
+    type: str = "llm_call_started"
+    messages: Union[str, List[Dict[str, str]]]
+    tools: Optional[List[dict]] = None
+    callbacks: Optional[List[Any]] = None
+    available_functions: Optional[Dict[str, Any]] = None
+
+
+class LLMCallCompletedEvent(CrewEvent):
+    """Event emitted when a LLM call completes"""
+
+    type: str = "llm_call_completed"
+    response: Any
+    call_type: LLMCallType
+
+
+class LLMCallFailedEvent(CrewEvent):
+    """Event emitted when a LLM call fails"""
+
+    error: str
+    type: str = "llm_call_failed"

src/crewai/utilities/events/task_events.py

@@ -1,4 +1,4 @@
-from typing import Any, Optional
+from typing import Optional
 
 from crewai.tasks.task_output import TaskOutput
 from crewai.utilities.events.base_events import CrewEvent

tests/crew_test.py

@@ -833,6 +833,12 @@ def test_crew_verbose_output(capsys):
 
     crew.kickoff()
     captured = capsys.readouterr()
+
+    # Filter out event listener logs (lines starting with '[')
+    filtered_output = "\n".join(
+        line for line in captured.out.split("\n") if not line.startswith("[")
+    )
+
     expected_strings = [
         "\x1b[1m\x1b[95m# Agent:\x1b[00m \x1b[1m\x1b[92mResearcher",
         "\x1b[00m\n\x1b[95m## Task:\x1b[00m \x1b[92mResearch AI advancements.",
@@ -845,27 +851,19 @@ def test_crew_verbose_output(capsys):
     ]
 
     for expected_string in expected_strings:
-        assert expected_string in captured.out
+        assert expected_string in filtered_output
 
     # Now test with verbose set to False
     crew.verbose = False
     crew._logger = Logger(verbose=False)
     crew.kickoff()
-    expected_listener_logs = [
-        "[🚀 CREW 'CREW' STARTED]",
-        "[📋 TASK STARTED: RESEARCH AI ADVANCEMENTS.]",
-        "[🤖 AGENT 'RESEARCHER' STARTED TASK]",
-        "[✅ AGENT 'RESEARCHER' COMPLETED TASK]",
-        "[✅ TASK COMPLETED: RESEARCH AI ADVANCEMENTS.]",
-        "[📋 TASK STARTED: WRITE ABOUT AI IN HEALTHCARE.]",
-        "[🤖 AGENT 'SENIOR WRITER' STARTED TASK]",
-        "[✅ AGENT 'SENIOR WRITER' COMPLETED TASK]",
-        "[✅ TASK COMPLETED: WRITE ABOUT AI IN HEALTHCARE.]",
-        "[✅ CREW 'CREW' COMPLETED]",
-    ]
     captured = capsys.readouterr()
-    for log in expected_listener_logs:
-        assert log in captured.out
+    filtered_output = "\n".join(
+        line
+        for line in captured.out.split("\n")
+        if not line.startswith("[") and line.strip() and not line.startswith("\x1b")
+    )
+    assert filtered_output == ""
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])

tests/utilities/cassettes/test_converter_with_llama3_2_model.yaml

@@ -5,32 +5,860 @@ interactions:
       JSON must follow this format exactly:\n{\n  \"name\": str,\n  \"age\": int\n}\n\n###
       User:\nName: Alice Llama, Age: 30\n\n", "options": {"stop": []}, "stream": false}'
     headers:
-      Accept:
+      accept:
       - '*/*'
-      Accept-Encoding:
+      accept-encoding:
       - gzip, deflate
-      Connection:
+      connection:
       - keep-alive
-      Content-Length:
+      content-length:
       - '321'
-      Content-Type:
-      - application/json
-      User-Agent:
-      - python-requests/2.32.2
+      host:
+      - localhost:11434
+      user-agent:
+      - litellm/1.60.2
     method: POST
     uri: http://localhost:11434/api/generate
   response:
-    body:
-      string: '{"model":"llama3.2:3b","created_at":"2025-02-18T21:52:20.737635Z","response":"{\"name\":
-        \"Alice Llama\", \"age\": 30}","done":true,"done_reason":"stop","context":[128006,9125,128007,271,38766,1303,33025,2696,25,6790,220,2366,18,271,128009,128006,882,128007,271,14711,744,512,5618,5625,279,2768,1495,1139,2764,4823,382,5207,27785,279,2764,4823,323,4400,775,382,791,4823,2011,1833,420,3645,7041,512,517,220,330,609,794,610,345,220,330,425,794,528,198,633,14711,2724,512,678,25,30505,445,81101,11,13381,25,220,966,271,128009,128006,78191,128007,271,5018,609,794,330,62786,445,81101,498,330,425,794,220,966,92],"total_duration":2438288750,"load_duration":819026959,"prompt_eval_count":82,"prompt_eval_duration":1368000000,"eval_count":15,"eval_duration":249000000}'
+    content: '{"model":"llama3.2:3b","created_at":"2025-02-21T02:57:55.059392Z","response":"{\"name\":
+      \"Alice Llama\", \"age\": 30}","done":true,"done_reason":"stop","context":[128006,9125,128007,271,38766,1303,33025,2696,25,6790,220,2366,18,271,128009,128006,882,128007,271,14711,744,512,5618,5625,279,2768,1495,1139,2764,4823,382,5207,27785,279,2764,4823,323,4400,775,382,791,4823,2011,1833,420,3645,7041,512,517,220,330,609,794,610,345,220,330,425,794,528,198,633,14711,2724,512,678,25,30505,445,81101,11,13381,25,220,966,271,128009,128006,78191,128007,271,5018,609,794,330,62786,445,81101,498,330,425,794,220,966,92],"total_duration":4675906000,"load_duration":836091458,"prompt_eval_count":82,"prompt_eval_duration":3561000000,"eval_count":15,"eval_duration":275000000}'
     headers:
       Content-Length:
       - '761'
       Content-Type:
       - application/json; charset=utf-8
       Date:
-      - Tue, 18 Feb 2025 21:52:21 GMT
-    status:
-      code: 200
-      message: OK
+      - Fri, 21 Feb 2025 02:57:55 GMT
+    http_version: HTTP/1.1
+    status_code: 200
+- request:
+    body: '{"name": "llama3.2:3b"}'
+    headers:
+      accept:
+      - '*/*'
+      accept-encoding:
+      - gzip, deflate
+      connection:
+      - keep-alive
+      content-length:
+      - '23'
+      content-type:
+      - application/json
+      host:
+      - localhost:11434
+      user-agent:
+      - litellm/1.60.2
+    method: POST
+    uri: http://localhost:11434/api/show
+  response:
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+      \   a. No trademark licenses are granted under this Agreement, and in connection
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+      \\\"LLAMA 3.2 COMMUNITY LICENSE AGREEMENT\\nLlama 3.2 Version Release Date:
+      September 25, 2024\\n\\n\u201CAgreement\u201D means the terms and conditions
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+      or \u201Cyou\u201D means you, or your employer or any other person or entity
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+      other rights \\nowned by Meta embodied in the Llama Materials to use, reproduce,
+      distribute, copy, create derivative works \\nof, and make modifications to the
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+      UNLESS REQUIRED BY APPLICABLE LAW, THE LLAMA MATERIALS AND ANY OUTPUT AND \\nRESULTS
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+      ANY KIND, AND META DISCLAIMS\\nALL WARRANTIES OF ANY KIND, BOTH EXPRESS AND
+      IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES\\nOF TITLE, NON-INFRINGEMENT,
+      MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE. YOU ARE SOLELY RESPONSIBLE\\nFOR
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+      TORT, NEGLIGENCE, PRODUCTS LIABILITY, OR OTHERWISE, ARISING OUT OF THIS AGREEMENT,
+      \\nFOR ANY LOST PROFITS OR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL,
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+      \   a. No trademark licenses are granted under this Agreement, and in connection
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+      owned by or associated with the other or any of its affiliates, \\nexcept as
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tests/utilities/test_events.py

@@ -1,6 +1,5 @@
-import json
 from datetime import datetime
-from unittest.mock import MagicMock, patch
+from unittest.mock import Mock, patch
 
 import pytest
 from pydantic import Field
@@ -9,9 +8,9 @@ from crewai.agent import Agent
 from crewai.agents.crew_agent_executor import CrewAgentExecutor
 from crewai.crew import Crew
 from crewai.flow.flow import Flow, listen, start
+from crewai.llm import LLM
 from crewai.task import Task
 from crewai.tools.base_tool import BaseTool
-from crewai.tools.tool_usage import ToolUsage
 from crewai.utilities.events.agent_events import (
     AgentExecutionCompletedEvent,
     AgentExecutionErrorEvent,
@@ -21,8 +20,11 @@ from crewai.utilities.events.crew_events import (
     CrewKickoffCompletedEvent,
     CrewKickoffFailedEvent,
     CrewKickoffStartedEvent,
+    CrewTestCompletedEvent,
+    CrewTestStartedEvent,
 )
 from crewai.utilities.events.crewai_event_bus import crewai_event_bus
+from crewai.utilities.events.event_listener import EventListener
 from crewai.utilities.events.event_types import ToolUsageFinishedEvent
 from crewai.utilities.events.flow_events import (
     FlowCreatedEvent,
@@ -31,6 +33,12 @@ from crewai.utilities.events.flow_events import (
     MethodExecutionFailedEvent,
     MethodExecutionStartedEvent,
 )
+from crewai.utilities.events.llm_events import (
+    LLMCallCompletedEvent,
+    LLMCallFailedEvent,
+    LLMCallStartedEvent,
+    LLMCallType,
+)
 from crewai.utilities.events.task_events import (
     TaskCompletedEvent,
     TaskFailedEvent,
@@ -52,26 +60,35 @@ base_task = Task(
     expected_output="hi",
     agent=base_agent,
 )
+event_listener = EventListener()
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])
 def test_crew_emits_start_kickoff_event():
     received_events = []
+    mock_span = Mock()
 
-    with crewai_event_bus.scoped_handlers():
-
-        @crewai_event_bus.on(CrewKickoffStartedEvent)
-        def handle_crew_start(source, event):
-            received_events.append(event)
-
-        crew = Crew(agents=[base_agent], tasks=[base_task], name="TestCrew")
+    @crewai_event_bus.on(CrewKickoffStartedEvent)
+    def handle_crew_start(source, event):
+        received_events.append(event)
 
+    crew = Crew(agents=[base_agent], tasks=[base_task], name="TestCrew")
+    with (
+        patch.object(
+            event_listener._telemetry, "crew_execution_span", return_value=mock_span
+        ) as mock_crew_execution_span,
+        patch.object(
+            event_listener._telemetry, "end_crew", return_value=mock_span
+        ) as mock_crew_ended,
+    ):
         crew.kickoff()
+    mock_crew_execution_span.assert_called_once_with(crew, None)
+    mock_crew_ended.assert_called_once_with(crew, "hi")
 
-        assert len(received_events) == 1
-        assert received_events[0].crew_name == "TestCrew"
-        assert isinstance(received_events[0].timestamp, datetime)
-        assert received_events[0].type == "crew_kickoff_started"
+    assert len(received_events) == 1
+    assert received_events[0].crew_name == "TestCrew"
+    assert isinstance(received_events[0].timestamp, datetime)
+    assert received_events[0].type == "crew_kickoff_started"
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])
@@ -92,6 +109,45 @@ def test_crew_emits_end_kickoff_event():
     assert received_events[0].type == "crew_kickoff_completed"
 
 
+@pytest.mark.vcr(filter_headers=["authorization"])
+def test_crew_emits_test_kickoff_type_event():
+    received_events = []
+    mock_span = Mock()
+
+    @crewai_event_bus.on(CrewTestStartedEvent)
+    def handle_crew_end(source, event):
+        received_events.append(event)
+
+    @crewai_event_bus.on(CrewTestCompletedEvent)
+    def handle_crew_test_end(source, event):
+        received_events.append(event)
+
+    eval_llm = LLM(model="gpt-4o-mini")
+    with (
+        patch.object(
+            event_listener._telemetry, "test_execution_span", return_value=mock_span
+        ) as mock_crew_execution_span,
+    ):
+        crew = Crew(agents=[base_agent], tasks=[base_task], name="TestCrew")
+        crew.test(n_iterations=1, eval_llm=eval_llm)
+
+        # Verify the call was made with correct argument types and values
+        assert mock_crew_execution_span.call_count == 1
+        args = mock_crew_execution_span.call_args[0]
+        assert isinstance(args[0], Crew)
+        assert args[1] == 1
+        assert args[2] is None
+        assert args[3] == eval_llm
+
+    assert len(received_events) == 2
+    assert received_events[0].crew_name == "TestCrew"
+    assert isinstance(received_events[0].timestamp, datetime)
+    assert received_events[0].type == "crew_test_started"
+    assert received_events[1].crew_name == "TestCrew"
+    assert isinstance(received_events[1].timestamp, datetime)
+    assert received_events[1].type == "crew_test_completed"
+
+
 @pytest.mark.vcr(filter_headers=["authorization"])
 def test_crew_emits_kickoff_failed_event():
     received_events = []
@@ -142,9 +198,20 @@ def test_crew_emits_end_task_event():
     def handle_task_end(source, event):
         received_events.append(event)
 
+    mock_span = Mock()
     crew = Crew(agents=[base_agent], tasks=[base_task], name="TestCrew")
+    with (
+        patch.object(
+            event_listener._telemetry, "task_started", return_value=mock_span
+        ) as mock_task_started,
+        patch.object(
+            event_listener._telemetry, "task_ended", return_value=mock_span
+        ) as mock_task_ended,
+    ):
+        crew.kickoff()
 
-    crew.kickoff()
+    mock_task_started.assert_called_once_with(crew=crew, task=base_task)
+    mock_task_ended.assert_called_once_with(mock_span, base_task, crew)
 
     assert len(received_events) == 1
     assert isinstance(received_events[0].timestamp, datetime)
@@ -334,24 +401,29 @@ def test_tools_emits_error_events():
 
 def test_flow_emits_start_event():
     received_events = []
+    mock_span = Mock()
 
-    with crewai_event_bus.scoped_handlers():
+    @crewai_event_bus.on(FlowStartedEvent)
+    def handle_flow_start(source, event):
+        received_events.append(event)
 
-        @crewai_event_bus.on(FlowStartedEvent)
-        def handle_flow_start(source, event):
-            received_events.append(event)
-
-        class TestFlow(Flow[dict]):
-            @start()
-            def begin(self):
-                return "started"
+    class TestFlow(Flow[dict]):
+        @start()
+        def begin(self):
+            return "started"
 
+    with (
+        patch.object(
+            event_listener._telemetry, "flow_execution_span", return_value=mock_span
+        ) as mock_flow_execution_span,
+    ):
         flow = TestFlow()
         flow.kickoff()
 
-        assert len(received_events) == 1
-        assert received_events[0].flow_name == "TestFlow"
-        assert received_events[0].type == "flow_started"
+    mock_flow_execution_span.assert_called_once_with("TestFlow", ["begin"])
+    assert len(received_events) == 1
+    assert received_events[0].flow_name == "TestFlow"
+    assert received_events[0].type == "flow_started"
 
 
 def test_flow_emits_finish_event():
@@ -455,6 +527,7 @@ def test_multiple_handlers_for_same_event():
 
 def test_flow_emits_created_event():
     received_events = []
+    mock_span = Mock()
 
     @crewai_event_bus.on(FlowCreatedEvent)
     def handle_flow_created(source, event):
@@ -465,8 +538,15 @@ def test_flow_emits_created_event():
         def begin(self):
             return "started"
 
-    flow = TestFlow()
-    flow.kickoff()
+    with (
+        patch.object(
+            event_listener._telemetry, "flow_creation_span", return_value=mock_span
+        ) as mock_flow_creation_span,
+    ):
+        flow = TestFlow()
+        flow.kickoff()
+
+    mock_flow_creation_span.assert_called_once_with("TestFlow")
 
     assert len(received_events) == 1
     assert received_events[0].flow_name == "TestFlow"
@@ -495,3 +575,43 @@ def test_flow_emits_method_execution_failed_event():
     assert received_events[0].flow_name == "TestFlow"
     assert received_events[0].type == "method_execution_failed"
     assert received_events[0].error == error
+
+
+@pytest.mark.vcr(filter_headers=["authorization"])
+def test_llm_emits_call_started_event():
+    received_events = []
+
+    @crewai_event_bus.on(LLMCallStartedEvent)
+    def handle_llm_call_started(source, event):
+        received_events.append(event)
+
+    @crewai_event_bus.on(LLMCallCompletedEvent)
+    def handle_llm_call_completed(source, event):
+        received_events.append(event)
+
+    llm = LLM(model="gpt-4o-mini")
+    llm.call("Hello, how are you?")
+
+    assert len(received_events) == 2
+    assert received_events[0].type == "llm_call_started"
+    assert received_events[1].type == "llm_call_completed"
+
+
+@pytest.mark.vcr(filter_headers=["authorization"])
+def test_llm_emits_call_failed_event():
+    received_events = []
+
+    @crewai_event_bus.on(LLMCallFailedEvent)
+    def handle_llm_call_failed(source, event):
+        received_events.append(event)
+
+    error_message = "Simulated LLM call failure"
+    with patch.object(LLM, "_call_llm", side_effect=Exception(error_message)):
+        llm = LLM(model="gpt-4o-mini")
+        with pytest.raises(Exception) as exc_info:
+            llm.call("Hello, how are you?")
+
+        assert str(exc_info.value) == error_message
+        assert len(received_events) == 1
+        assert received_events[0].type == "llm_call_failed"
+        assert received_events[0].error == error_message