How do I soft delete a tag?

Use the "alterTag" action to set a tag's "status" to "inactive".

How do I undelete a tag? 

To undelete a soft-deleted tag, use the "alterTag" action to set a tag's "status" to "active". 
You cannot undelete a tag that has been deleted using the "deleteTags" action.

How do I list only active tags?

Use the "listTags" action with "status" set to "active".

How do I list soft-deleted tags?

Use the "listTags" action with "status" set to "inactive".

How do I clone a tag?

Use the "describeTags" action to retrieve a tag and use its properties in "createTag" to create a new tag. You must give the new tag a different name.