onyx_agent_registry

Active

declared in 1.26.0

Signed verified-registry audit. Fetches a public A2A agent registry (default a2aregistry.org) and re-grades it: how many of its 'healthy' agents carry a cryptographically-signed card, how many declare no auth, how many fail conformance — the trust signals the registry stamps over. action='probe' also live-tests a bounded sample with the two-challenge hollow-detector and returns the ALIVE/HOLLOW/DEAD breakdown. Ed25519-signed, timestamped, recomputable. Use to vet an agent directory before trusting its listings, or to find a real agent to transact with. (price: $0.05 USDC, tier: metered)

Parameters schema

{
  "type": "object",
  "required": [],
  "properties": {
    "action": {
      "enum": [
        "census",
        "probe"
      ],
      "type": "string",
      "default": "census",
      "description": "'census' = fast structural audit (no live calls). 'probe' = census + live hollow-detection on a sample."
    },
    "sample": {
      "type": "integer",
      "default": 5,
      "description": "For action='probe': how many agents to live-test (bounded 1-12, default 5). Probed in listed order."
    },
    "registry_url": {
      "type": "string",
      "default": "https://www.a2aregistry.org/api/agents?limit=500",
      "description": "Registry agents API. Default a2aregistry.org."
    }
  }
}

What this tool wraps· 1 endpoint

min confidence0.70 0.50

Packagepypi: x402
declared dependency0.85

Parent server

onyx-paid-mcp

https://github.com/dimitrilaouanis-tech/onyx-mcp

2/7 registries

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