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Description: We propose a text editor to help users plan, structure and reflect on their writing process. It provides continuously updated paragraph- wise summaries as margin annotations, using automatic text sum- marization. Summary levels range from full text, to selected (central) sentences, down to a collection of keywords. To understand how users interact with this system during writing, we conducted two user studies (N=4 and N=8) in which people wrote analytic essays about a given topic and article. As a key finding, the summaries gave users an external perspective on their writing and helped them to revise the content and scope of their drafted paragraphs. People further used the tool to quickly gain an overview of the text and developed strategies to integrate insights from the automated summaries. More broadly, this work explores and highlights the value of designing AI tools for writers, with Natural Language Pro- cessing (NLP) capabilities that go beyond direct text generation and correction. Paper: https://dl.acm.org/doi/10.1145/3526113.3545672