Since v2.5, Nucleus supports the methods from the Movable Type API.

The list of available methods is listed below:

• mt.supportedMethods
• mt.supportedTextFilters
• mt.publishPost
• mt.getCategoryList
• mt.getPostCategories
• mt.setPostCategories
• mt.getRecentPostTitles
• mt.getTrackbackPings

Some notes:

• Nucleus only supports one category for each item. This means that all categories except the 'primary' category for an item will be ignored.
• Trackback is not implemented in the Nucleus core (it's avalailable as a plugin instead). Because of this, mt.getTrackbackPings will return an empty array by default.
• Nucleus doesn't have text filters, so mt.getSupportedTextFilters returns an empty array.