ChatGPT Codex · Claude Code
Use the agent you already trust
Agents such as ChatGPT Codex and Claude Code can work with your CalliopeWriter manuscript, so you do not have to copy and paste between the writing app and a chat.
Mac only · Local files · Reviewable edits
Stop copying your novel into chat.
CalliopeWriter connects your manuscript to your AI agent. Your agent proposes edits, and you decide what enters the draft.
Chapter 07 · Working draft
The crossing
At dawn the ferry wore a veil of river fog. Mara kept one hand on the letter in her coat, as if the paper itself might choose to leave.
The bell rang once. Behind her, the town reduced itself to roofs, smoke, and a promise she had not made.
Revision proposal ready · Review 3 changes before applying
Your agent + your history
Let your agent work inside the manuscript.
ChatGPT Codex or Claude Code can read scene context and propose changes. You review the result before it changes the draft.
Version history
Keep writing, even when you are offline
Writing, local saves, and version history continue offline. AI assistance and online backup require network access.
Revise faster without losing the earlier draft.
Work with an agent to solve draft problems, revise prose, and keep an evolving manuscript organized.
Work with an agent across your manuscript
ChatGPT Codex or Claude Code can read, edit, and organize scenes and chapters.
Review your agent’s edits
Your agent proposes an edit, and you choose what goes into your draft.
Write offline. Keep every version.
Your manuscript, saves, and version history stay with you wherever you write.
The working rhythm
Write, ask, inspect, decide.
Write your manuscript
Draft scenes and arrange them into chapters.
Prompt your agent on the part that needs work
Select text, a scene, a chapter, or multiple chapters, then tell your agent what to change.
Review your agent’s edits
Your agent proposes an edit, and you choose what goes into your draft.
CalliopeWriter Blog
How writer-controlled agent work fits together.
Read practical notes about voice, local files, reviewable changes, and connected agents.
Read every blog article →Field note · 2026-08-27
Guide AI edits with your own prose examples
CalliopeWriter uses writer-selected Voice Anchors, editable rules, scoped context, and reviewable diffs to keep authors in control of AI revision.
Read the note →Field note · 2026-08-13
Choose ChatGPT or Claude and keep writing offline
CalliopeWriter separates AI agent work from the local manuscript, so writers can keep drafting without a network connection.
Read the note →Field note · 2026-08-11
How version history makes AI edits easier to undo
Version history helps writers compare, review, and go back after an AI agent revises a long manuscript.
Read the note →Get CalliopeWriter launch updates.
For novelists who want AI help, local manuscript files, and final control over every accepted edit.
We will send product progress, release news, and launch offers.