AI writing system
Quill
An AI-assisted macOS environment for planning, drafting, and revising novel-length work with safe agent collaboration, checkpoints, and Git-backed history.
The question
Can an agent share a writing workspace without owning it?
Quill explores how a writer and a command-line agent can work on the same files while the human retains authorship, visibility, and a path back from every change.
The experiment
Safety is part of the writing environment.
The macOS implementation combines a Markdown editor, a real terminal, filesystem watching, hash-aware conflict handling, and Git-backed checkpoints. External edits are visible, conflicting versions are preserved, and broad revisions remain reversible.
Why it remains
Human and agent work need a shared control surface.
Quill remains an active product experiment in local-first collaboration. The work tests whether ordinary files, explicit conflicts, and recoverable history can make agent-assisted writing feel like editing rather than delegation.
Evidence boundary
What this note can prove.
This note records an implemented experiment and the question behind it. It does not turn private source into public evidence or present an experiment as a measured business outcome.
- Private implementation
- The application repository is private. This note reflects implemented editor, terminal, conflict, and checkpoint surfaces; it does not link to a private build.