feat: add skill lifecycle events

lib/crewai/src/crewai/events/__init__.py

@@ -87,6 +87,14 @@ from crewai.events.types.reasoning_events import (
     AgentReasoningStartedEvent,
     ReasoningEvent,
 )
+from crewai.events.types.skill_events import (
+    SkillActivatedEvent,
+    SkillDiscoveryCompletedEvent,
+    SkillDiscoveryStartedEvent,
+    SkillEvent,
+    SkillLoadFailedEvent,
+    SkillLoadedEvent,
+)
 from crewai.events.types.task_events import (
     TaskCompletedEvent,
     TaskEvaluationEvent,
@@ -184,6 +192,12 @@ __all__ = [
     "MethodExecutionFinishedEvent",
     "MethodExecutionStartedEvent",
     "ReasoningEvent",
+    "SkillActivatedEvent",
+    "SkillDiscoveryCompletedEvent",
+    "SkillDiscoveryStartedEvent",
+    "SkillEvent",
+    "SkillLoadFailedEvent",
+    "SkillLoadedEvent",
     "TaskCompletedEvent",
     "TaskEvaluationEvent",
     "TaskFailedEvent",

lib/crewai/src/crewai/events/types/skill_events.py

@@ -0,0 +1,60 @@
+"""Skill lifecycle events for the Agent Skills standard.
+
+Events emitted during skill discovery, loading, and activation.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from crewai.events.base_events import BaseEvent
+
+
+class SkillEvent(BaseEvent):
+    """Base event for skill operations."""
+
+    skill_name: str = ""
+    skill_path: str | None = None
+    from_agent: Any | None = None
+    from_task: Any | None = None
+
+    def __init__(self, **data: Any) -> None:
+        super().__init__(**data)
+        self._set_agent_params(data)
+        self._set_task_params(data)
+
+
+class SkillDiscoveryStartedEvent(SkillEvent):
+    """Event emitted when skill discovery begins."""
+
+    type: str = "skill_discovery_started"
+    search_path: str
+
+
+class SkillDiscoveryCompletedEvent(SkillEvent):
+    """Event emitted when skill discovery completes."""
+
+    type: str = "skill_discovery_completed"
+    skills_found: int
+    skill_names: list[str]
+
+
+class SkillLoadedEvent(SkillEvent):
+    """Event emitted when a skill is loaded at metadata level."""
+
+    type: str = "skill_loaded"
+    disclosure_level: int = 1
+
+
+class SkillActivatedEvent(SkillEvent):
+    """Event emitted when a skill is activated (promoted to instructions level)."""
+
+    type: str = "skill_activated"
+    disclosure_level: int = 2
+
+
+class SkillLoadFailedEvent(SkillEvent):
+    """Event emitted when skill loading fails."""
+
+    type: str = "skill_load_failed"
+    error: str