{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": { "Service": "bedrock-mantle.amazonaws.com" },
      "Action": "sts:AssumeRole",
      "Condition": {
        "StringEquals": { "aws:SourceAccount": "123456789012" },
        "ArnLike": { "aws:SourceArn": "arn:aws:bedrock-mantle:*:123456789012:*" }
      }
    }
  ]
}