By the way, as I could not find a single example of an Apple Script
for tagging selected items in the archive on a quick & dirty search,
so here is my variant for the records:

<pre>
-- tag all selected items in Yojimbo
-- Presents the user with the list of current tags in
-- Yojimbo; if none is chosen, the user can create a
-- new tag by pressing cancel. If this is canceled as
-- well, nothing happens.

tell application "Yojimbo"
set all_tags to (name of every tag)
set tag_name to choose from list all_tags with prompt "Tag selected
items with (or Cancel to create new tag):"
if tag_name is false then
display dialog "Tag name to add:" default answer "new"
set tag_name to text returned of result
end if
set the_selection to the selection
repeat with an_item in the_selection
add tags {tag_name} to an_item
end repeat
end tell
</pre>