An annotated bibliography though gives an overview and can also include a critical evaluation of the source. The length may vary a great deal from a couple of lines to a paragraph and these are normally written in full sentences.
People who read annotated bibliographies want to gain from the experience of the person who has already read and used the book. At the minimum, they want a summary of the contents. However, they also want the bibliography writer’s critical evaluation of the book/report or article.
They may want to know:
the strengths and weaknesses of the source
its place in and relationship to the wider field of research
how it adds to the research of the field
if the information is sound, logical and well researched
if it is readable and informative
if it is broad and balanced
the intended audience
the aims and philosophical or theoretical bases of the source.
(Sourced from https://www.dlsweb.rmit.edu.au/lsu/content/2_AssessmentTasks/assess_pdf/annotated%20bibliographies%20LL.pdf )