TreeWriter: AI-Assisted Hierarchical Planning and Writing for Long-Form Documents
Zijian Zhang, Fangshi Du, Xingjian Liu, Pan Chen, Oliver Huang, Runlong Ye, Michael Liut, Al\'an Aspuru-Guzik

TL;DR
TreeWriter is a hierarchical AI-assisted writing system that enhances long-form document creation by supporting multi-level planning, editing, and collaboration, leading to improved idea development and user control.
Contribution
It introduces a novel tree-structured document representation combined with integrated AI support for hierarchical planning and editing in long documents.
Findings
Improves idea exploration and development.
Enhances perceived authorial control.
Supports collaborative writing workflows.
Abstract
Long documents pose many challenges to current intelligent writing systems. These include maintaining consistency across sections, sustaining efficient planning and writing as documents become more complex, and effectively providing and integrating AI assistance to the user. Existing AI co-writing tools offer either inline suggestions or limited structured planning, but rarely support the entire writing process that begins with high-level ideas and ends with polished prose, in which many layers of planning and outlining are needed. Here, we introduce TreeWriter, a hierarchical writing system that represents documents as trees and integrates contextual AI support. TreeWriter allows authors to create, save, and refine document outlines at multiple levels, facilitating drafting, understanding, and iterative editing of long documents. A built-in AI agent can dynamically load relevant…
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Taxonomy
TopicsWriting and Handwriting Education · Artificial Intelligence in Games · Text Readability and Simplification
