{
  "anyOf": [
    {
      "type": "object",
      "required": [
        "role",
        "toolCallId",
        "toolName",
        "timestamp",
        "event"
      ],
      "properties": {
        "role": {
          "type": "string",
          "minLength": 1
        },
        "toolCallId": {
          "type": "string",
          "minLength": 1
        },
        "toolName": {
          "type": "string",
          "minLength": 1
        },
        "timestamp": {
          "type": "string",
          "format": "date-time"
        },
        "event": {
          "type": "string",
          "const": "tool_execution_start"
        }
      },
      "additionalProperties": true
    },
    {
      "type": "object",
      "required": [
        "role",
        "toolCallId",
        "toolName",
        "timestamp",
        "event"
      ],
      "properties": {
        "role": {
          "type": "string",
          "minLength": 1
        },
        "toolCallId": {
          "type": "string",
          "minLength": 1
        },
        "toolName": {
          "type": "string",
          "minLength": 1
        },
        "timestamp": {
          "type": "string",
          "format": "date-time"
        },
        "event": {
          "type": "string",
          "const": "tool_execution_update"
        }
      },
      "additionalProperties": true
    },
    {
      "type": "object",
      "required": [
        "role",
        "toolCallId",
        "toolName",
        "timestamp",
        "event",
        "isError"
      ],
      "properties": {
        "role": {
          "type": "string",
          "minLength": 1
        },
        "toolCallId": {
          "type": "string",
          "minLength": 1
        },
        "toolName": {
          "type": "string",
          "minLength": 1
        },
        "timestamp": {
          "type": "string",
          "format": "date-time"
        },
        "event": {
          "type": "string",
          "const": "tool_execution_end"
        },
        "isError": {
          "type": "boolean"
        }
      },
      "additionalProperties": true
    }
  ]
}