{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://regevidencehub.com/.well-known/mcp-tools.schema.json",
  "title": "RegEvidenceHub first-party MCP tool discovery index",
  "type": "object",
  "additionalProperties": false,
  "required": ["schema_version", "publisher", "platform", "scope", "observation_count", "tool_definition_count", "observations", "limitations"],
  "properties": {
    "schema_version": {"const": "1.0.0"},
    "publisher": {"const": "Technologies RegEvidence inc."},
    "platform": {"const": "RegEvidenceHub"},
    "scope": {"const": "first_party_read_only_tool_discovery"},
    "observation_count": {"type": "integer", "minimum": 1},
    "tool_definition_count": {"type": "integer", "minimum": 1},
    "observations": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["product_id", "product_name", "surface_id", "endpoint", "status_at_observation", "observed_at", "expires_at", "protocol_version", "schema_fingerprint_sha256", "tool_count", "tools"],
        "properties": {
          "product_id": {"enum": ["taxi", "cqc", "premises", "works", "waste", "cablecert", "factorytalk", "nodeset"]},
          "product_name": {"type": "string", "minLength": 1},
          "surface_id": {"enum": ["commercial", "ai_connector", "openai_connector"]},
          "endpoint": {"type": "string", "format": "uri", "pattern": "^https://[^/]+/"},
          "status_at_observation": {"const": "LIVE_OK"},
          "observed_at": {"type": "string", "format": "date-time"},
          "expires_at": {"type": "string", "format": "date-time"},
          "protocol_version": {"type": "string", "minLength": 1},
          "schema_fingerprint_sha256": {"type": "string", "pattern": "^[a-f0-9]{64}$"},
          "tool_count": {"type": "integer", "minimum": 0},
          "tools": {
            "type": "array",
            "items": {
              "type": "object",
              "additionalProperties": false,
              "required": ["name", "title", "description", "input_schema", "input_schema_sha256", "output_schema", "output_schema_sha256", "billing_status"],
              "properties": {
                "name": {"type": "string", "pattern": "^[a-zA-Z0-9_-]+$"},
                "title": {"type": ["string", "null"]},
                "description": {"type": "string"},
                "input_schema": {"type": "object"},
                "input_schema_sha256": {"type": "string", "pattern": "^[a-f0-9]{64}$"},
                "output_schema": {"type": ["object", "null"]},
                "output_schema_sha256": {"type": ["string", "null"], "pattern": "^[a-f0-9]{64}$"},
                "billing_status": {"const": "NOT_VERIFIED"}
              }
            }
          }
        }
      }
    },
    "limitations": {"type": "array", "minItems": 4, "items": {"type": "string", "minLength": 1}}
  }
}