src/shared/assistant-identity-values.ts

export function coerceIdentityValue(
  value: string | undefined,
  maxLength: number,
): string | undefined {
  if (typeof value !== "string") {
    return undefined;
  }
  const trimmed = value.trim();
  if (!trimmed) {
    return undefined;
  }
  if (trimmed.length <= maxLength) {
    return trimmed;
  }
  return trimmed.slice(0, maxLength);
}