{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://ortho32.dev/schemas/fabric-command.schema.json",
  "title": "FabricCommand",
  "description": "Logical fabric command submitted to ORTHO-32 fabric. Applications program against FabricCommand only and never write PCIe BAR registers directly.",
  "type": "object",
  "properties": {
    "opcode": {
      "type": "string",
      "enum": ["EXECUTE", "STEP", "TENSOR", "PROBE", "RESET", "ATTEST"],
      "description": "Fabric opcode. Logical API, not a BAR offset."
    },
    "device": {
      "type": "string",
      "description": "Stable target device identifier (OrthoDeviceId)"
    },
    "address": {
      "type": "string",
      "pattern": "^0x[0-9a-fA-F]+$",
      "description": "Typed address in ORTHO memory map (FabricAddress), hex-encoded"
    },
    "length": {
      "type": "integer",
      "minimum": 0,
      "description": "Payload length in bytes"
    },
    "epoch": {
      "type": "integer",
      "minimum": 0,
      "description": "Epoch counter for deterministic arbitration (FabricEpoch)"
    },
    "slot": {
      "type": "integer",
      "minimum": 0,
      "description": "Slot in static grant table (FabricSlot)"
    },
    "sequence": {
      "type": "integer",
      "minimum": 0,
      "description": "Monotonic sequence number for completion matching"
    },
    "payloadHash": {
      "type": "string",
      "pattern": "^[0-9a-fA-F]{64}$",
      "description": "SHA-256 hex digest of payload (64 hex chars)"
    },
    "flags": {
      "type": "integer",
      "minimum": 0,
      "description": "Bit flags for command options"
    }
  },
  "required": ["opcode", "device", "address", "length", "epoch", "slot", "sequence", "payloadHash", "flags"],
  "additionalProperties": false
}