{
  "version": "2.0.0",
  "protocol_family": "FCS-4.0",
  "protocol_version": "4.0",
  "domain": "agentjson.org",
  "updated": "2026-09-29",
  "description": "Operator-maintained discovery and interface contracts. FCS-4.0 identifies this publication family; it is not a certification of trust or protocol conformance.",
  "capabilities": [
    "read_contracts",
    "list_declared_neighbors",
    "run_contract_demo"
  ],
  "endpoints": {
    "skills": "https://agentjson.org/.well-known/skill-resolver.json",
    "topology": "https://agentjson.org/constellation.json",
    "invocation": "https://agentjson.org/invocation-registry.json",
    "demo": "https://agentjson.org/invoke/demo",
    "guidance": "https://agentjson.org/llms.txt"
  },
  "feeds": [],
  "unavailable": [
    {
      "capability": "verify_agent",
      "status": "not_implemented",
      "reason": "No calibrated trust scoring or lineage verification runtime."
    },
    {
      "capability": "coordinate_traversal",
      "status": "not_implemented",
      "reason": "Published topology is a declared neighbor map, not a T/D/S traversal engine."
    },
    {
      "capability": "abf",
      "status": "not_configured",
      "path": "/.well-known/abf.json"
    }
  ],
  "historical_documents": [
    {
      "url": "https://agentjson.org/.well-known/helix-mesh.json",
      "status": "SUPERSEDED_TOPOLOGY",
      "current_resource": "https://agentjson.org/constellation.json"
    },
    {
      "url": "https://agentjson.org/.well-known/invocation-substrate.json",
      "status": "LEGACY_CONTRACT",
      "current_resource": "https://agentjson.org/invocation-registry.json"
    },
    {
      "url": "https://agentjson.org/.well-known/trust-resolver.json",
      "status": "HISTORICAL_SNAPSHOT"
    },
    {
      "url": "https://agentjson.org/.well-known/intent-entropy-resolver.json",
      "status": "EXPERIMENTAL_SPECIFICATION",
      "limitation": "Multiplier ranges are declared model parameters, not measured amplification."
    }
  ]
}