fix(cron): normalize partial job records

tests/cron/test_jobs.py

@@ -207,6 +207,26 @@ class TestJobCRUD:
         jobs = list_jobs()
         assert len(jobs) == 2
 
+    def test_list_jobs_normalizes_partial_legacy_records(self, tmp_cron_dir):
+        save_jobs([
+            {
+                "id": "abc123deadbe",
+                "name": None,
+                "prompt": None,
+                "schedule_display": None,
+                "schedule": {"kind": "interval", "minutes": 60, "display": "every 60m"},
+                "enabled": True,
+            }
+        ])
+
+        jobs = list_jobs()
+
+        assert jobs[0]["id"] == "abc123deadbe"
+        assert jobs[0]["name"] == "abc123deadbe"
+        assert jobs[0]["prompt"] == ""
+        assert jobs[0]["schedule_display"] == "every 60m"
+        assert jobs[0]["state"] == "scheduled"
+
     def test_remove_job(self, tmp_cron_dir):
         job = create_job(prompt="Temp job", schedule="30m")
         assert remove_job(job["id"]) is True

tests/cron/test_scheduler.py

@@ -1788,6 +1788,11 @@ class TestBuildJobPromptSilentHint:
         result = _build_job_prompt(job)
         assert "[SILENT]" in result
 
+    def test_hint_present_when_legacy_prompt_is_null(self):
+        job = {"id": "abc123deadbe", "name": None, "prompt": None}
+        result = _build_job_prompt(job)
+        assert "[SILENT]" in result
+
     def test_delivery_guidance_present(self):
         """Cron hint tells agents their final response is auto-delivered."""
         job = {"prompt": "Generate a report"}

tests/tools/test_cronjob_tools.py

@@ -122,6 +122,28 @@ class TestUnifiedCronjobTool:
         assert listing["jobs"][0]["name"] == "Server Check"
         assert listing["jobs"][0]["state"] == "scheduled"
 
+    def test_list_handles_partial_legacy_job_records(self):
+        from cron.jobs import save_jobs
+
+        save_jobs([
+            {
+                "id": "abc123deadbe",
+                "name": None,
+                "prompt": None,
+                "schedule_display": None,
+                "schedule": {"kind": "interval", "minutes": 60, "display": "every 60m"},
+                "repeat": {"times": None, "completed": 0},
+                "enabled": True,
+            }
+        ])
+
+        listing = json.loads(cronjob(action="list"))
+
+        assert listing["success"] is True
+        assert listing["jobs"][0]["name"] == "abc123deadbe"
+        assert listing["jobs"][0]["prompt_preview"] == ""
+        assert listing["jobs"][0]["schedule"] == "every 60m"
+
     def test_pause_and_resume(self):
         created = json.loads(cronjob(action="create", prompt="Check", schedule="every 1h"))
         job_id = created["job_id"]