fix(cron): normalize absolute skill paths before skill_view (#59824)

Cron jobs may store absolute paths to skills under HERMES_HOME/skills or
external_dirs, but skill_view rejects absolute names for security. Extract
the slash-command normalization into agent.skill_utils and reuse it when
cron loads job skills.

agent/skill_commands.py

@@ -143,37 +143,9 @@ def _load_skill_payload(skill_identifier: str, task_id: str | None = None) -> tu
 
     try:
         from tools.skills_tool import SKILLS_DIR, skill_view
-        from agent.skill_utils import get_external_skills_dirs
+        from agent.skill_utils import normalize_skill_lookup_name
 
-        identifier_path = Path(raw_identifier).expanduser()
-        if identifier_path.is_absolute():
-            normalized = None
-            trusted_roots = [SKILLS_DIR]
-            try:
-                trusted_roots.extend(get_external_skills_dirs())
-            except Exception:
-                pass
-
-            # Prefer the lexical path under a trusted skill root before
-            # resolving symlinks.  Slash-command discovery can legitimately
-            # find a skill via ~/.hermes/skills/<name> where <name> is a
-            # symlink to a checked-out skill elsewhere.  Resolving first turns
-            # that trusted visible path into an arbitrary absolute path that
-            # skill_view() refuses to load.
-            for root in trusted_roots:
-                try:
-                    normalized = str(identifier_path.relative_to(root))
-                    break
-                except ValueError:
-                    continue
-
-            if normalized is None:
-                try:
-                    normalized = str(identifier_path.resolve().relative_to(SKILLS_DIR.resolve()))
-                except Exception:
-                    normalized = raw_identifier
-        else:
-            normalized = raw_identifier.lstrip("/")
+        normalized = normalize_skill_lookup_name(raw_identifier)
 
         loaded_skill = json.loads(
             skill_view(normalized, task_id=task_id, preprocess=False)

agent/skill_utils.py

@@ -507,6 +507,46 @@ def get_all_skills_dirs() -> List[Path]:
     return dirs
 
 
+def normalize_skill_lookup_name(identifier: str) -> str:
+    """Normalize a skill identifier to a ``skill_view()``-safe relative path.
+
+    Slash commands and cron jobs may store absolute paths to skills that live
+    under ``~/.hermes/skills/`` (including via symlinks) or configured
+    ``skills.external_dirs``. ``skill_view()`` rejects absolute names for
+    security, so callers must translate trusted absolute paths to their
+    relative form first.
+    """
+    raw_identifier = (identifier or "").strip()
+    if not raw_identifier:
+        return raw_identifier
+
+    identifier_path = Path(raw_identifier).expanduser()
+    if not identifier_path.is_absolute():
+        return raw_identifier.lstrip("/")
+
+    trusted_roots = [get_skills_dir()]
+    try:
+        trusted_roots.extend(get_external_skills_dirs())
+    except Exception:
+        pass
+
+    # Prefer the lexical path under a trusted skill root before resolving
+    # symlinks. Slash-command discovery can legitimately find a skill via
+    # ~/.hermes/skills/<name> where <name> is a symlink to a checked-out
+    # skill elsewhere. Resolving first turns that trusted visible path into
+    # an arbitrary absolute path that skill_view() refuses to load.
+    for root in trusted_roots:
+        try:
+            return str(identifier_path.relative_to(root))
+        except ValueError:
+            continue
+
+    try:
+        return str(identifier_path.resolve().relative_to(get_skills_dir().resolve()))
+    except Exception:
+        return raw_identifier
+
+
 def _resolve_for_skill_ownership(path) -> Path:
     path_obj = path if isinstance(path, Path) else Path(str(path))
     try:

cron/scheduler.py

@@ -2195,6 +2195,7 @@ def _build_job_prompt(job: dict, prerun_script: Optional[tuple] = None) -> str:
     from tools.skills_tool import skill_view
     from tools.skill_usage import bump_use
     from agent.skill_bundles import build_bundle_invocation_message, resolve_bundle_command_key
+    from agent.skill_utils import normalize_skill_lookup_name
 
     parts = []
     skipped: list[str] = []
@@ -2225,7 +2226,7 @@ def _build_job_prompt(job: dict, prerun_script: Optional[tuple] = None) -> str:
             continue
 
         try:
-            loaded = json.loads(skill_view(skill_name))
+            loaded = json.loads(skill_view(normalize_skill_lookup_name(skill_name)))
         except (json.JSONDecodeError, TypeError):
             logger.warning("Cron job '%s': skill '%s' returned invalid JSON, skipping", job.get("name", job.get("id")), skill_name)
             skipped.append(skill_name)