Function isTeamPermissionUpdate

src/utils/teammateMailbox.ts:1001–1013

(
  messageText: string,
)

 * Checks if a message text contains a team permission update
 */
export function isTeamPermissionUpdate(
  messageText: string,
): TeamPermissionUpdateMessage | null {
  try {
    const parsed = jsonParse(messageText)
    if (parsed && parsed.type === 'team_permission_update') {
      return parsed as TeamPermissionUpdateMessage
    }
  } catch {
    // Not JSON or not a valid team permission update
  }
  return null
}

/**
 * Mode set request message sent from leader to teammate via mailbox