{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://mere.run/contracts/graph-node-preflight.v1.schema.json",
  "title": "mere.run Plugin Graph Node Preflight v1",
  "type": "object",
  "additionalProperties": false,
  "required": ["contract_version", "status", "diagnostics", "requirements"],
  "properties": {
    "contract_version": {"const": "mere.run/plugin-graph-preflight.v1"},
    "status": {"enum": ["ok", "warning", "blocked"]},
    "diagnostics": {"type": "array", "items": {"$ref": "#/$defs/diagnostic"}},
    "requirements": {"$ref": "#/$defs/requirements"}
  },
  "$defs": {
    "diagnostic": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "severity", "title", "message"],
      "properties": {
        "id": {"type": "string", "pattern": "^[a-z][a-z0-9_-]{0,127}$"},
        "severity": {"enum": ["info", "warning", "blocker"]},
        "title": {"type": "string", "minLength": 1},
        "message": {"type": "string", "minLength": 1},
        "suggested_action_ids": {"type": "array", "uniqueItems": true, "items": {"type": "string", "minLength": 1}}
      }
    },
    "requirements": {
      "type": "object",
      "additionalProperties": false,
      "required": ["model_ids", "accelerator_backends"],
      "properties": {
        "model_ids": {"type": "array", "uniqueItems": true, "items": {"type": "string", "minLength": 1}},
        "accelerator_backends": {"type": "array", "uniqueItems": true, "items": {"enum": ["metal", "cuda", "rocm", "cpu"]}},
        "minimum_accelerator_memory_bytes": {"type": ["integer", "null"], "minimum": 0},
        "minimum_system_memory_bytes": {"type": ["integer", "null"], "minimum": 0},
        "minimum_disk_bytes": {"type": ["integer", "null"], "minimum": 0},
        "minimum_cpu_cores": {"type": ["integer", "null"], "minimum": 1},
        "network_access": {"type": ["boolean", "null"]}
      }
    }
  }
}