test(cron): cover absolute skill path normalization (#59824)

Add unit tests for normalize_skill_lookup_name and a cron scheduler
regression that absolute paths under the skills dir reach skill_view as
relative lookups.

tests/agent/test_skill_utils.py

@@ -333,3 +333,42 @@ class TestSkillMatchesPlatformTermux:
             "agent.skill_utils.is_termux", return_value=False
         ):
             assert skill_matches_platform(fm) is True
+
+
+class TestNormalizeSkillLookupName:
+    def test_relative_path_unchanged(self, tmp_path, monkeypatch):
+        from agent.skill_utils import normalize_skill_lookup_name
+
+        monkeypatch.setattr("agent.skill_utils.get_skills_dir", lambda: tmp_path / "skills")
+        assert normalize_skill_lookup_name("foo/bar") == "foo/bar"
+
+    def test_absolute_under_skills_dir_becomes_relative(self, tmp_path, monkeypatch):
+        from agent.skill_utils import normalize_skill_lookup_name
+
+        skills_dir = tmp_path / "skills"
+        skill_dir = skills_dir / "category" / "my-skill"
+        skill_dir.mkdir(parents=True)
+        monkeypatch.setattr("agent.skill_utils.get_skills_dir", lambda: skills_dir)
+        assert normalize_skill_lookup_name(str(skill_dir)) == "category/my-skill"
+
+    def test_absolute_via_symlink_uses_lexical_relative_path(self, tmp_path, monkeypatch):
+        from agent.skill_utils import normalize_skill_lookup_name
+
+        skills_dir = tmp_path / "skills"
+        skills_dir.mkdir()
+        external = tmp_path / "external" / "my-skill"
+        external.mkdir(parents=True)
+        link = skills_dir / "my-skill"
+        try:
+            link.symlink_to(external)
+        except OSError:
+            pytest.skip("Symlinks not supported")
+        monkeypatch.setattr("agent.skill_utils.get_skills_dir", lambda: skills_dir)
+        assert normalize_skill_lookup_name(str(link)) == "my-skill"
+
+    def test_untrusted_absolute_returned_unchanged(self, tmp_path, monkeypatch):
+        from agent.skill_utils import normalize_skill_lookup_name
+
+        monkeypatch.setattr("agent.skill_utils.get_skills_dir", lambda: tmp_path / "skills")
+        outside = str(tmp_path / "outside" / "skill")
+        assert normalize_skill_lookup_name(outside) == outside

tests/cron/test_scheduler.py

@@ -2885,6 +2885,31 @@ class TestBuildJobPromptMissingSkill:
         assert "go" in result
 
 
+class TestBuildJobPromptAbsoluteSkillPath:
+    """Cron jobs may store absolute skill paths; normalize before skill_view."""
+
+    def test_absolute_skill_path_normalized_before_skill_view(self, tmp_path):
+        skills_dir = tmp_path / "skills"
+        skill_dir = skills_dir / "alpha-skill"
+        skill_dir.mkdir(parents=True)
+        (skill_dir / "SKILL.md").write_text("# Alpha\nDo alpha.")
+        absolute_path = str(skill_dir)
+        seen_names: list[str] = []
+
+        def _skill_view(name: str) -> str:
+            seen_names.append(name)
+            if name == "alpha-skill":
+                return json.dumps({"success": True, "content": "# Alpha\nDo alpha."})
+            return json.dumps({"success": False, "error": f"Skill '{name}' not found."})
+
+        with patch("agent.skill_utils.get_skills_dir", return_value=skills_dir), \
+             patch("tools.skills_tool.skill_view", side_effect=_skill_view):
+            result = _build_job_prompt({"skills": [absolute_path], "prompt": "go"})
+
+        assert seen_names == ["alpha-skill"]
+        assert "Do alpha." in result
+
+
 class TestBuildJobPromptBumpUse:
     """Verify that cron jobs bump skill usage counters so the curator sees them as active."""