Hi! When I load the document below, I first need to manually evaluate the
code block before I can use the links. I would like the code block to be
automatically evaluated when I load the document, making the links usable
at once.

Is there some clever in-buffer-setting I can use, to specify that I want
the block called on loading, some kind of post-load hook?

#+BEGIN_SRC emacs-lisp
(defun handy-stuff(arg)
  (message arg))
#+END_SRC

[[elisp:(handy-stuff "foo")][foo]]
[[elisp:(handy-stuff "bar")][bar]]