Function isReservedMetaKey

client/src/utils/metaUtils.ts:96–120

(key: string)

 * @see https://modelcontextprotocol.io/specification/2025-06-18/basic/index#meta
 */
export const isReservedMetaKey = (key: string): boolean => {
  const trimmedKey = key.trim();
  if (!trimmedKey) {
    return false;
  }

  const candidateSegment = getPrefixSegment(trimmedKey) ?? trimmedKey;
  const labels = splitLabels(candidateSegment);
  if (!labels || labels.length < 2) {
    return false;
  }

  for (let i = 0; i < labels.length - 1; i += 1) {
    const current = labels[i];
    const next = labels[i + 1];
    if (
      RESERVED_NAMESPACE_LABELS.includes(current) &&
      META_PREFIX_LABEL_REGEX.test(next)
    ) {
      return true;
    }
  }

  return false;
};

/**
 * Validates the optional prefix portion of a metadata key.