Function getSiblingToolUseIDsFromLookup

src/utils/messages.ts:1421–1430

(
  message: NormalizedMessage,
  lookups: MessageLookups,
)

 * Get sibling tool use IDs using pre-computed lookup. O(1).
 */
export function getSiblingToolUseIDsFromLookup(
  message: NormalizedMessage,
  lookups: MessageLookups,
): ReadonlySet<string> {
  const toolUseID = getToolUseID(message)
  if (!toolUseID) {
    return EMPTY_STRING_SET
  }
  return lookups.siblingToolUseIDs.get(toolUseID) ?? EMPTY_STRING_SET
}

/**
 * Get progress messages for a message using pre-computed lookup. O(1).