fix: improve skills typing, path validation, and event tracing

lib/crewai/src/crewai/agent/core.py

@@ -268,6 +268,8 @@ class Agent(BaseAgent):
         if self.allow_code_execution:
             self._validate_docker_installation()
 
+        self.set_skills()
+
         return self
 
     def _setup_agent_executor(self) -> None:

lib/crewai/src/crewai/skills/__init__.py

@@ -9,12 +9,18 @@ from crewai.skills.loader import (
     format_skill_context,
     load_resources,
 )
-from crewai.skills.models import DisclosureLevel, Skill, SkillFrontmatter
+from crewai.skills.models import (
+    DisclosureLevel,
+    ResourceDirName,
+    Skill,
+    SkillFrontmatter,
+)
 from crewai.skills.parser import SkillParseError, parse_skill_md
 
 
 __all__ = [
     "DisclosureLevel",
+    "ResourceDirName",
     "Skill",
     "SkillFrontmatter",
     "SkillParseError",

lib/crewai/src/crewai/skills/loader.py

@@ -7,7 +7,11 @@ for agent use, and format skill context for prompt injection.
 from __future__ import annotations
 
 from pathlib import Path
-from typing import Any
+from typing import TYPE_CHECKING
+
+
+if TYPE_CHECKING:
+    from crewai.agents.agent_builder.base_agent import BaseAgent
 
 from crewai.events.event_bus import crewai_event_bus
 from crewai.events.types.skill_events import (
@@ -28,7 +32,7 @@ from crewai.skills.parser import (
 
 def discover_skills(
     search_path: Path,
-    source: Any | None = None,
+    source: BaseAgent | None = None,
 ) -> list[Skill]:
     """Scan a directory for skill directories containing SKILL.md.
 
@@ -51,6 +55,7 @@ def discover_skills(
         crewai_event_bus.emit(
             source,
             event=SkillDiscoveryStartedEvent(
+                from_agent=source,
                 search_path=search_path,
             ),
         )
@@ -68,6 +73,7 @@ def discover_skills(
                 crewai_event_bus.emit(
                     source,
                     event=SkillLoadedEvent(
+                        from_agent=source,
                         skill_name=skill.name,
                         skill_path=skill.path,
                         disclosure_level=skill.disclosure_level.value,
@@ -78,6 +84,7 @@ def discover_skills(
                 crewai_event_bus.emit(
                     source,
                     event=SkillLoadFailedEvent(
+                        from_agent=source,
                         skill_name=child.name,
                         skill_path=child,
                         error=str(e),
@@ -88,6 +95,7 @@ def discover_skills(
         crewai_event_bus.emit(
             source,
             event=SkillDiscoveryCompletedEvent(
+                from_agent=source,
                 search_path=search_path,
                 skills_found=len(skills),
                 skill_names=[s.name for s in skills],
@@ -99,7 +107,7 @@ def discover_skills(
 
 def activate_skill(
     skill: Skill,
-    source: Any | None = None,
+    source: BaseAgent | None = None,
 ) -> Skill:
     """Promote a skill to INSTRUCTIONS disclosure level.
 
@@ -121,6 +129,7 @@ def activate_skill(
         crewai_event_bus.emit(
             source,
             event=SkillActivatedEvent(
+                from_agent=source,
                 skill_name=activated.name,
                 skill_path=activated.path,
                 disclosure_level=activated.disclosure_level.value,

lib/crewai/src/crewai/skills/models.py

@@ -8,7 +8,7 @@ from __future__ import annotations
 
 from enum import IntEnum
 from pathlib import Path
-from typing import Any
+from typing import Any, Literal
 
 from pydantic import BaseModel, Field, model_validator
 
@@ -20,6 +20,7 @@ from crewai.skills.validation import (
 
 
 MAX_DESCRIPTION_LENGTH: int = 1024
+ResourceDirName = Literal["scripts", "references", "assets"]
 
 
 class DisclosureLevel(IntEnum):
@@ -88,7 +89,7 @@ class Skill(BaseModel):
     instructions: str | None = None
     path: Path
     disclosure_level: DisclosureLevel = Field(default=DisclosureLevel.METADATA)
-    resource_files: dict[str, list[str]] | None = None
+    resource_files: dict[ResourceDirName, list[str]] | None = None
 
     @property
     def name(self) -> str:
@@ -119,7 +120,7 @@ class Skill(BaseModel):
         self,
         level: DisclosureLevel,
         instructions: str | None = None,
-        resource_files: dict[str, list[str]] | None = None,
+        resource_files: dict[ResourceDirName, list[str]] | None = None,
     ) -> Skill:
         """Create a new Skill at a different disclosure level.
 

lib/crewai/src/crewai/skills/parser.py

@@ -12,7 +12,12 @@ from typing import Any
 
 import yaml
 
-from crewai.skills.models import DisclosureLevel, Skill, SkillFrontmatter
+from crewai.skills.models import (
+    DisclosureLevel,
+    ResourceDirName,
+    Skill,
+    SkillFrontmatter,
+)
 from crewai.skills.validation import validate_directory_name
 
 
@@ -145,12 +150,13 @@ def load_skill_resources(skill: Skill) -> Skill:
     if skill.disclosure_level < DisclosureLevel.INSTRUCTIONS:
         skill = load_skill_instructions(skill)
 
-    resource_files: dict[str, list[str]] = {}
+    resource_dirs: list[tuple[ResourceDirName, Path]] = [
-    for dir_name, resource_dir in (
         ("scripts", skill.scripts_dir),
         ("references", skill.references_dir),
         ("assets", skill.assets_dir),
-    ):
+    ]
+    resource_files: dict[ResourceDirName, list[str]] = {}
+    for dir_name, resource_dir in resource_dirs:
         if resource_dir.is_dir():
             resource_files[dir_name] = sorted(
                 str(f.relative_to(resource_dir))