Since org-agenda-kill explicitly requires org-agenda-mode by this line

(or (eq major-mode 'org-agenda-mode) (user-error "Not in agenda"))

at the beginning of its definition, after introducing org-ql-view-mode in ba7d4a2, user can no longer delete org headings from inside Org-QL buffer.

This is loosely related to #35 in a sense that it shows that Org-mode sometimes tests and restricts execution of its org-agenda functions.

Temporary work-around for users until this is solved would be advising org-agenda-kill with :around advice and overriding value of major-mode - which is not pretty.

  (advice-add #'org-agenda-kill :around (lambda (orig-fun &rest args)
                                          (let ((major-mode 'org-agenda-mode))
                                            (apply orig-fun args))))

after searching org-agenda.el, more commands are using this equality test:

• org-agenda-capture
• org-agenda-archive-with
• org-agenda-kill-all-agenda-buffers (but this fn is probably not relevant to org-ql)
• org-agenda-save-markers-for-cut-and-paste (also not sure if relevant)