I'm feeling lucky functionality

[brigazvi]

Duckduckgo supports using "! {query}" to go to the most plausible website.
It would be great if Unduck could support this feature.

[Davr1]

There's also an alternative syntax that ddg supports, where the query is prefixed with a backslash: \{query}

[jnzd]

Use \ to go to directly to the first search result. For example, \futurama.

It is documented as directly navigating to the first search result. The question would be the first result of which search engine as I don't think this could easily be implemented for an arbitrary choice of primary search engine. Google probably makes the most sense as it is already the default fallback of unduck, but duckduckgo would also be a valid choice.