I would find it quite useful to have a variable similar to `org-agenda-prefix-format' that would apply changes to the *contents*, rather than to the *prefix* of agenda items.
The nice thing about `org-agenda-prefix-format' is that it allows different formatting for different agenda buffers. Similarly, it would be useful to be able to supply different functions to alter the agenda items themselves, depending on the context. I was thinking that in theory this could be done by advising `org-agenda-format-item', but I'm not sure how to get the advice to apply in a conditional way depending on the agenda. There was a similar discussion related to the specific case of removing TODO keywords from certain agendas, https://lists.gnu.org/archive/html/emacs-orgmode/2010-09/msg00810.html So, for example: to hide TODO keywords from the agenda: (setq org-agenda-custom-commands '(("a" agenda "" ((org-agenda-todo-keyword-format ""))))) But what if, for example, I would like to remove priorities cookies as well?