{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://venuemind.dev/schemas/activity-ledger.schema.json",
  "title": "VenueMind Activity Ledger",
  "type": "array",
  "items": {
    "type": "object",
    "required": [
      "id",
      "schemaVersion",
      "sequence",
      "type",
      "actor",
      "actorId",
      "actorType",
      "source",
      "sessionId",
      "occurredAt",
      "details",
      "previousHash",
      "hash"
    ],
    "properties": {
      "id": {
        "type": "string",
        "pattern": "^ledger-[0-9]+$"
      },
      "schemaVersion": {
        "const": 1
      },
      "sequence": {
        "type": "integer",
        "minimum": 1
      },
      "type": {
        "type": "string",
        "minLength": 1
      },
      "actor": {
        "enum": [
          "human",
          "agent",
          "system"
        ]
      },
      "actorId": {
        "type": "string",
        "minLength": 1
      },
      "actorType": {
        "enum": [
          "human",
          "agent",
          "system"
        ]
      },
      "source": {
        "enum": [
          "studio",
          "webmcp",
          "mcp",
          "system",
          "agent-tool"
        ]
      },
      "sessionId": {
        "type": "string",
        "minLength": 1
      },
      "occurredAt": {
        "type": "string",
        "format": "date-time"
      },
      "details": {
        "type": "object"
      },
      "previousHash": {
        "anyOf": [
          {
            "const": "genesis"
          },
          {
            "type": "string",
            "pattern": "^ledger-[0-9a-f]{8}$"
          }
        ]
      },
      "hash": {
        "type": "string",
        "pattern": "^ledger-[0-9a-f]{8}$"
      }
    },
    "additionalProperties": false
  }
}