Wikipedia:Bot policy

Because bots

the community expects bots to meet high standards before they are approved for use on designated tasks. The operation of unapproved bots, or use of approved bots in ways outside their approved conditions of operation, is prohibited and may in some cases lead to blocking of the user account and possible sanctions for the operator. Note that high-speed semi-automated editing may effectively be considered bots in some cases (see WP:MEATBOT), even if performed by a human editor. If in doubt, check.

Contributors should create a separate account in order to operate a bot. The account's name should identify the bot function (e.g. <Task>Bot), or the operator's main account (e.g. <Username>Bot). In all cases, it should be immediately clear that the edits are made by an automated account, which is usually achieved by including Bot at the end of the account name. Bots must only edit while logged into their account. Tools not considered to be bots do not require a separate account, but some users do choose to make separate accounts for non-bot but high-speed editing. New bots are required to use to ensure that they edit only when logged in. Bots which have previously edited while logged out should be retrofitted to use assertion or a similar function.

The contributions of a bot account remain the responsibility of its operator, whose account must be prominently identifiable on its user page. In particular, the bot operator is responsible for the repair of any damage caused by a bot which operates incorrectly. All policies apply to a bot account in the same way as to any other user account. Bot accounts are considered alternative accounts of their operator for the purposes of the user account policy. To ensure compliance with WP:BOTCOMM, IP editors wishing to operate a bot must first register an account before operating a bot.

Bot accounts should not be used for contributions that do not fall within the scope of the bot's designated tasks. In particular, bot operators should not use a bot account to respond to messages related to the bot. Bot operators may wish to redirect a bot account's discussion page to their own.

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Wikipedia