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MediaWiki:Apihelp-managetags-param-operation

Which operation to perform:

create
Create a new change tag for manual use.
delete
Remove a change tag from the database, including removing the tag from all revisions, recent change entries and log entries on which it is used.
activate
Activate a change tag, allowing users to apply it manually.
deactivate
Deactivate a change tag, preventing users from applying it manually.