{
 "licence": "CC BY 4.0",
 "source": "https://github.com/commonworld-one/commonworld",
 "generated_at": "2026-10-16T01:55:00Z",
 "id": "a2a-registry-a2aregistry-org",
 "name": "A2A Registry (a2aregistry.org)",
 "url": "https://commonworld.one/atlas/platforms/a2a-registry-a2aregistry-org/",
 "json_url": "https://commonworld.one/atlas/platforms/a2a-registry-a2aregistry-org.json",
 "website": "https://a2aregistry.org",
 "category": "registries",
 "category_label": "Registries & directories",
 "type": "tool_catalog",
 "status": "live",
 "summary": "Register of independently operated A2A agents with observed reachability, conformance and task-verified evidence from periodic sweeps.",
 "tags": [
  "a2a",
  "registry",
  "liveness"
 ],
 "has_money_flow": false,
 "money_flow": [],
 "key_number": {
  "kind": "metric",
  "value": 568,
  "unit": "agents listed (557 reachable)",
  "window": "sweep 2026-10-15 18:55 UTC",
  "observed_at": "2026-10-15T20:29:00Z",
  "source_url": "https://a2aregistry.org/"
 },
 "verified_at": "2026-10-15T20:29:00Z",
 "last_checked": "2026-10-15T20:29:00Z",
 "claims_count": 4,
 "disclosure": null,
 "claims": [
  {
   "kind": "site_reachable",
   "statement": "Homepage served with full list",
   "value": null,
   "unit": null,
   "window": null,
   "basis": "direct_observation",
   "source_url": "https://a2aregistry.org/",
   "quote": "A2A REGISTRY · 566 agents · 556 reachable · sweep 2026-10-15 14:45 UTC",
   "observed_at": "2026-10-15T18:08:00Z",
   "methods": [
    "curl -sL https://a2aregistry.org"
   ],
   "outcome": "supported"
  },
  {
   "kind": "description",
   "statement": "Evidence-based register",
   "value": null,
   "unit": null,
   "window": null,
   "basis": "direct_observation",
   "source_url": "https://a2aregistry.org/",
   "quote": "Register of independently operated A2A agents. Evidence is observed, not endorsed.",
   "observed_at": "2026-10-15T18:08:00Z",
   "methods": [
    "curl -sL https://a2aregistry.org"
   ],
   "outcome": "supported"
  },
  {
   "kind": "metric",
   "statement": "Listed / reachable agents",
   "value": 568,
   "unit": "agents listed (557 reachable)",
   "window": "sweep 2026-10-15 18:55 UTC",
   "basis": "operator_claim",
   "source_url": "https://a2aregistry.org/",
   "quote": "568 agents · 557 reachable",
   "observed_at": "2026-10-15T20:29:25.377Z",
   "methods": [
    "curl -sL https://a2aregistry.org"
   ],
   "outcome": "supported",
   "history": [
    {
     "value": 566,
     "unit": "agents listed (556 reachable)",
     "window": "sweep 2026-10-15 14:45 UTC",
     "statement": "Listed / reachable agents",
     "quote": "566 agents · 556 reachable",
     "source_url": "https://a2aregistry.org/",
     "observed_at": "2026-10-15T18:08:00Z",
     "basis": "operator_claim",
     "outcome": "supported",
     "superseded_at": "2026-10-15T21:45Z",
     "reason": "newer value re-observed independently (Codex QA)"
    }
   ],
   "recheck": {
    "basis": "independent_re_observation",
    "by": "Codex QA (qa-agent-b)",
    "run": "atlas-verified-2026-10-15T1840Z-qa",
    "ref": "origin/research/atlas-catalog-seed-2026-10-15@ef1f6cf",
    "claim_id": "legacy-html:a2a-registry-a2aregistry-org:metric:1",
    "evidence_attempt_ids": [
     "qa-agent-b-003"
    ],
    "finding": "Current A2A Registry page shows 568 listed and 557 reachable, not 566/556."
   }
  },
  {
   "kind": "recent_activity",
   "statement": "Sweep at 2026-10-15 18:55 UTC",
   "value": null,
   "unit": null,
   "window": null,
   "basis": "direct_observation",
   "source_url": "https://a2aregistry.org/",
   "quote": "sweep 2026-10-15 18:55 UTC",
   "observed_at": "2026-10-15T20:29:25.377Z",
   "methods": [
    "curl -sL https://a2aregistry.org"
   ],
   "outcome": "supported",
   "history": [
    {
     "value": null,
     "unit": null,
     "window": null,
     "statement": "Sweep at 2026-10-15 14:45 UTC",
     "quote": "sweep 2026-10-15 14:45 UTC",
     "source_url": "https://a2aregistry.org/",
     "observed_at": "2026-10-15T18:08:00Z",
     "basis": "direct_observation",
     "outcome": "supported",
     "superseded_at": "2026-10-15T21:45Z",
     "reason": "newer value re-observed independently (Codex QA)"
    }
   ],
   "recheck": {
    "basis": "independent_re_observation",
    "by": "Codex QA (qa-agent-b)",
    "run": "atlas-verified-2026-10-15T1840Z-qa",
    "ref": "origin/research/atlas-catalog-seed-2026-10-15@ef1f6cf",
    "claim_id": "legacy-html:a2a-registry-a2aregistry-org:recent_activity:2",
    "evidence_attempt_ids": [
     "qa-agent-b-003"
    ],
    "finding": "Current page says sweep at 2026-10-15 18:55 UTC, later than the pinned 14:45 UTC observation."
   }
  }
 ],
 "qa_status": "checked"
}