Open Source

The Writing Surface
Designed For Your Agent.

One editor for writing and publishing. Your agent drafts in your voice. You approve every word with a keystroke. Then post to X or send to your subscribers, from the same pad.

$ npx openwriter setup

One command installs the skill, configures MCP, and opens the editor.

Get Started Free See Features
Works with every MCP-compatible agent

Your AI Writes. You Stay The Author.

Changes arrive as colored decorations — green inserts, blue rewrites, red deletes. Hit a to accept, r to reject, Shift+A to take it all. Every word that ships is a word you approved.

OpenWriter editor showing pending agent edits as green insert, blue rewrite, and red delete decorations

MCP + Tiptap + Markdown

No magic under the hood. Your agent connects over MCP, edits a real Tiptap document (the same surface you type on), and saves every change as plain Markdown on your disk. A protocol, an editor, a file format. All open.

Claude desktop app editing a chapter through the OpenWriter MCP connection
Your agentClaude, Codex, Cursor…
OpenWriter editor showing an agent's pending edits as green insert, blue rewrite, and red delete decorations
OpenWritera real Tiptap editor
Ch 1 - Static.md 
---
title: Ch 1 — Static
---

The fog burned off
late that morning,
the way it had all
that cold spring,
and Mara logged the
hour it cleared.

She kept the record
because the Accord
asked it of her.
Markdownplain .md on your disk

Finish The Book You've Been Writing For Years.

Your agent pulls every fragment from Google Drive, Docs, and Notion — then organizes them into a workspace built for novels. Chapters nest inside Parts. Characters and worldbuilding sit alongside. You fill the gaps together.

OpenWriter bookwriting view with chapter outline in a workspace

Write X Posts, Threads, And Articles Crafted For Virality.

Your agent runs the research — source pulls, study analysis, citations. You iterate in minutes, not weeks. Pixel-accurate thread builder. Full-bleed articles with cover images.

OpenWriter X thread compose view with linked tweets
X Thread
OpenWriter X Article compose view with cover image and long-form body
X Article
# Your documents are just files
~/.openwriter/
  My Novel/
    Part I — Setup/
      Chapter 1 - Origins.md
      Chapter 2 - The Call.md
    Part II — Confrontation/
      Chapter 3 - Rising Action.md
  Newsletter Draft.md
  _workspaces/
    My Novel.json

Open Source. No Lock-in.

MIT-licensed editor. Plain .md files on disk. No database, no proprietary format. Move them, copy them, grep them, do whatever you want. Every LLM reads and writes markdown natively. Your content is always yours.

✓ MIT license
✓ No database
✓ Open any .md file
✓ YAML frontmatter
✓ Version history
✓ Export to HTML/DOCX/PDF

Draft Your Next Post Before You Close This Tab.

One command installs the skill. Your agent is writing inside the editor within a minute. Free to start, no credit card, your words stay yours.

Install The Skill