fix: invalidate skills cache on toggle/save/delete and stat skills_dir for deletion detection

api/profiles.py

@@ -1595,6 +1595,10 @@ def _skill_tree_max_mtime_ns(skills_dir: Path, config_path: Path) -> int:
         pass
     if not skills_dir.is_dir():
         return max_ns
+    try:
+        max_ns = max(max_ns, skills_dir.stat().st_mtime_ns)
+    except OSError:
+        pass
     try:
         from agent.skill_utils import iter_skill_index_files
         for skill_md in iter_skill_index_files(skills_dir, "SKILL.md"):

api/routes.py

@@ -431,6 +431,7 @@ def _visible_pinned_lineage_ids(session_rows) -> set[str]:
 from api.profiles import (  # noqa: F401, E402  (re-export)
     _profiles_match,
     _is_isolated_profile_mode,
+    _SKILLS_STATS_CACHE,
     get_active_profile_name,
     get_active_profile_name as _get_active_profile_name,
     get_active_hermes_home,
@@ -19868,6 +19869,7 @@ def _handle_skill_save(handler, body):
     if skill_file.is_symlink():
         return bad(handler, "Cannot save to a symlinked skill file")
     skill_file.write_text(body["content"], encoding="utf-8")
+    _SKILLS_STATS_CACHE.clear()
     return j(handler, {"ok": True, "name": skill_name, "path": str(skill_file)})
 
 
@@ -19887,6 +19889,7 @@ def _handle_skill_delete(handler, body):
         return bad(handler, "Skill not found", 404)
     skill_dir = matches[0].parent
     shutil.rmtree(str(skill_dir))
+    _SKILLS_STATS_CACHE.clear()
     return j(handler, {"ok": True, "name": body["name"]})
 
 
@@ -19961,7 +19964,7 @@ def _handle_skill_toggle(handler, body):
         _save_yaml_config_file(config_path, cfg)
 
     reload_config()  # outside with block — reload_config() acquires the lock itself
-
+    _SKILLS_STATS_CACHE.clear()
     return j(handler, {"ok": True, "name": name, "enabled": enabled})